Pub Date : 2024-11-25DOI: 10.1016/j.jwpe.2024.106652
Wenkai Li , Tianlong Zheng , Xiaoyan Yang , Bing Xu , Jinlong He , Ximei Zhang
Rural sewage collection systems are important parts of rural sewage engineering and the conditions in underdeveloped mountainous areas are not conducive to the construction and operation of conventional rural sewage collection systems. This study investigated and analyzed the practical rural sewage collection system in an underdeveloped mountainous area, and found that the diameters of the public rural sewers in the region were mostly DN300 and DN500, the relative depth was generally <0.3, and the frequency of siltation was 6 %. The concentration of chemical oxygen demand (COD), suspended solids (SS) and ammonia nitrogen in the rural sewage collection system was relatively high, and the pollution degree of the sewage could be reflected through the conductivity, turbidity, dissolved oxygen and oxidation reduction potential, so as to realize the rapid monitoring of the rural sewage characteristics and ensure the normal operation of the terminal treatment facilities. The removal capacity of COD and SS in sewers and ditches was different. It is suggested to strengthen the operation and maintenance of the collection system, optimize the design parameters of the collection system and evaluate the concentration of influent pollutants in the treatment facilities to improve the effectiveness of rural sewage treatment.
农村污水收集系统是农村污水工程的重要组成部分，欠发达山区的条件不利于常规农村污水收集系统的建设和运行。本研究调查分析了欠发达山区农村污水收集系统的实际情况，发现该地区农村公共污水管道的管径多为 DN300 和 DN500，相对埋深一般为 <0.3，淤积频率为 6%。农村污水收集系统中的化学需氧量（COD）、悬浮物（SS）和氨氮的浓度相对较高，通过电导率、浊度、溶解氧和氧化还原电位可以反映污水的污染程度，从而实现对农村污水特征的快速监测，保证终端处理设施的正常运行。下水道和沟渠对 COD 和 SS 的去除能力不同。建议加强收集系统的运行维护，优化收集系统的设计参数，评估处理设施的进水污染物浓度，提高农村污水处理效果。
{"title":"Structural and sewage characteristics of practical rural sewage collection systems in underdeveloped mountainous areas","authors":"Wenkai Li , Tianlong Zheng , Xiaoyan Yang , Bing Xu , Jinlong He , Ximei Zhang","doi":"10.1016/j.jwpe.2024.106652","DOIUrl":"10.1016/j.jwpe.2024.106652","url":null,"abstract":"<div><div>Rural sewage collection systems are important parts of rural sewage engineering and the conditions in underdeveloped mountainous areas are not conducive to the construction and operation of conventional rural sewage collection systems. This study investigated and analyzed the practical rural sewage collection system in an underdeveloped mountainous area, and found that the diameters of the public rural sewers in the region were mostly DN300 and DN500, the relative depth was generally <0.3, and the frequency of siltation was 6 %. The concentration of chemical oxygen demand (COD), suspended solids (SS) and ammonia nitrogen in the rural sewage collection system was relatively high, and the pollution degree of the sewage could be reflected through the conductivity, turbidity, dissolved oxygen and oxidation reduction potential, so as to realize the rapid monitoring of the rural sewage characteristics and ensure the normal operation of the terminal treatment facilities. The removal capacity of COD and SS in sewers and ditches was different. It is suggested to strengthen the operation and maintenance of the collection system, optimize the design parameters of the collection system and evaluate the concentration of influent pollutants in the treatment facilities to improve the effectiveness of rural sewage treatment.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106652"},"PeriodicalIF":6.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Photocatalytic activity, reaction kinetics, modeling, and thermodynamics of commercial TiO2-P25 and ZnO nanoparticles (NPs) for ibuprofen (IBU) photodegradation were investigated. Photodegradation experiments were performed in a batch reactor under UV irradiation. The photodegradation performances of TiO2-P25 and ZnO NPs were further studied and modeled under different operation conditions, by varying the reaction temperature, catalyst bulk density, and the initial concentration of the IBU solution. The descriptive kinetic models for the experimental data were tested, through the estimated kinetic parameters, together with the statistical information, revealing that the reaction rate in the case of TiO2-P25 is of first order while the ZnO NPs follow second-order kinetics with respect to IBU. The photodegradation mechanisms for both TiO2-P25 and ZnO NPs were determined to be Langmuir-Hinshelwood and Eley-Rideal, respectively. Thermodynamic parameters were assessed, particularly, changes in Gibbs free energy, enthalpy, and entropy indicating the efficient photodegradation performance of these NPs.
{"title":"Ibuprofen photodegradation promoted by ZnO and TiO2-P25 nanoparticles: A comprehensive kinetic, reaction mechanisms, and thermodynamic investigation","authors":"Maryam Hmoudah , Rosanna Paparo , Carmela Chianese , Amjad El-Qanni , Tapio Salmi , Riccardo Tesser , Vincenzo Russo , Martino Di Serio","doi":"10.1016/j.jwpe.2024.106598","DOIUrl":"10.1016/j.jwpe.2024.106598","url":null,"abstract":"<div><div>Photocatalytic activity, reaction kinetics, modeling, and thermodynamics of commercial TiO<sub>2</sub>-P25 and ZnO nanoparticles (NPs) for ibuprofen (IBU) photodegradation were investigated. Photodegradation experiments were performed in a batch reactor under UV irradiation. The photodegradation performances of TiO<sub>2</sub>-P25 and ZnO NPs were further studied and modeled under different operation conditions, by varying the reaction temperature, catalyst bulk density, and the initial concentration of the IBU solution. The descriptive kinetic models for the experimental data were tested, through the estimated kinetic parameters, together with the statistical information, revealing that the reaction rate in the case of TiO<sub>2</sub>-P25 is of first order while the ZnO NPs follow second-order kinetics with respect to IBU. The photodegradation mechanisms for both TiO<sub>2</sub>-P25 and ZnO NPs were determined to be Langmuir-Hinshelwood and Eley-Rideal, respectively. Thermodynamic parameters were assessed, particularly, changes in Gibbs free energy, enthalpy, and entropy indicating the efficient photodegradation performance of these NPs.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106598"},"PeriodicalIF":6.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1016/j.jwpe.2024.106627
Rui Xiao , Zhenghua Liu , Min Xu , Guoping Jiang , Yang Peng , Cunzeng Li , Jie Wang , Huaqun Yin , Lechang Xu
The bioremediation efforts using sulfate-reducing bacteria (SRB) face significant challenges due to prolonged start-up times and instability under extreme environmental conditions, such as the low temperatures and acidic groundwater found in uranium mining areas. To address the issues, cold-tolerant SRB inocula were selectively screened to efficiently remove sulfate and heavy metals from raw groundwater at 15 °C, achieving a high specific sulfate reduction rate of 2.3 gSO42−·gVSS−1·d−1. Enterobacteriaceae emerged as the most prevalent SRBs in inoculum, constituting 28 % of the total population. We further found that these SRB harbored diverse genes for cold and acidic adaptation, such as ompC and cspA encoding porin protein and cold shock protein, respectively, as well as F-type H+-transporting ATPase genes maintaining intracellular pH homeostasis in acidic environments. However, when scaling up from a lab-scale bioreactor (0.1 L) to a pilot-scale system (1000 L), the limited growth of Enterobacteriaceae led to a decrease in the sulfate reduction rate, which may result from the lack of biosynthesis pathways of alanine and tyrosine. Taken together, our results revealed the potential mechanisms of SRB for cold and acidic adaptation, which provides a theoretical foundation to develop in situ bioremediation for acid-mined uranium groundwater at low temperature.
{"title":"Microbial mechanisms of sulfate reduction for low-temperature bioremediation of acid-mined uranium sandstone groundwater","authors":"Rui Xiao , Zhenghua Liu , Min Xu , Guoping Jiang , Yang Peng , Cunzeng Li , Jie Wang , Huaqun Yin , Lechang Xu","doi":"10.1016/j.jwpe.2024.106627","DOIUrl":"10.1016/j.jwpe.2024.106627","url":null,"abstract":"<div><div>The bioremediation efforts using sulfate-reducing bacteria (SRB) face significant challenges due to prolonged start-up times and instability under extreme environmental conditions, such as the low temperatures and acidic groundwater found in uranium mining areas. To address the issues, cold-tolerant SRB inocula were selectively screened to efficiently remove sulfate and heavy metals from raw groundwater at 15 °C, achieving a high specific sulfate reduction rate of 2.3 gSO<sub>4</sub><sup>2−</sup>·gVSS<sup>−1</sup>·d<sup>−1</sup>. <em>Enterobacteriaceae</em> emerged as the most prevalent SRBs in inoculum, constituting 28 % of the total population. We further found that these SRB harbored diverse genes for cold and acidic adaptation, such as <em>ompC</em> and <em>cspA</em> encoding porin protein and cold shock protein, respectively, as well as F-type H<sup>+</sup>-transporting ATPase genes maintaining intracellular pH homeostasis in acidic environments. However, when scaling up from a lab-scale bioreactor (0.1 L) to a pilot-scale system (1000 L), the limited growth of <em>Enterobacteriaceae</em> led to a decrease in the sulfate reduction rate, which may result from the lack of biosynthesis pathways of alanine and tyrosine. Taken together, our results revealed the potential mechanisms of SRB for cold and acidic adaptation, which provides a theoretical foundation to develop in situ bioremediation for acid-mined uranium groundwater at low temperature.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106627"},"PeriodicalIF":6.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1016/j.jwpe.2024.106631
Junlong Cai , Bin Liu , Fazhi Xie , Xin Mao , Bing Zhang
Cr(VI) in chromium-containing industrial wastewater, which is highly toxic and difficult to degrade, brings great challenges to the treatment of industrial wastewater. However, conventional chromium removal methods suffer from low efficiency and secondary contamination. This study demonstrates that the micelle-enhanced nanofiltration (MENF) process is an effective strategy for the removal of Cr(VI). Micelles generated from two commonly used cationic surfactants (cetyltrimethylammonium bromide (CTAB) and cetyltrimethylammonium chloride (CTAC)) were capable of complexing with Cr(VI), resulting in the formation of aggregates with larger hydrodynamic diameters that were effectively retained by the membrane. The results showed that CTAC had a greater performance in removing Cr(VI) compared to CTAB, and the removal rate can reach 98.55 % at an initial concentration of 100 ppm. Meanwhile, the retention rate of surfactant under each condition was more than 96.23 %, which effectively reduced the generation of secondary pollution. Even in the presence of interfering anions, Cr(VI) still had a high affinity for cationic surfactant micelles. In addition, concentration polarization and micelles deposition acted as the main fouling potential during MENF process. This study provides a new insight into technological innovation and environmental protection in the field of wastewater treatment.
{"title":"Micelle-enhanced nanofiltration process for chromium-containing wastewater treatment: Performance, Cr(VI) redox and mechanism","authors":"Junlong Cai , Bin Liu , Fazhi Xie , Xin Mao , Bing Zhang","doi":"10.1016/j.jwpe.2024.106631","DOIUrl":"10.1016/j.jwpe.2024.106631","url":null,"abstract":"<div><div>Cr(VI) in chromium-containing industrial wastewater, which is highly toxic and difficult to degrade, brings great challenges to the treatment of industrial wastewater. However, conventional chromium removal methods suffer from low efficiency and secondary contamination. This study demonstrates that the micelle-enhanced nanofiltration (MENF) process is an effective strategy for the removal of Cr(VI). Micelles generated from two commonly used cationic surfactants (cetyltrimethylammonium bromide (CTAB) and cetyltrimethylammonium chloride (CTAC)) were capable of complexing with Cr(VI), resulting in the formation of aggregates with larger hydrodynamic diameters that were effectively retained by the membrane. The results showed that CTAC had a greater performance in removing Cr(VI) compared to CTAB, and the removal rate can reach 98.55 % at an initial concentration of 100 ppm. Meanwhile, the retention rate of surfactant under each condition was more than 96.23 %, which effectively reduced the generation of secondary pollution. Even in the presence of interfering anions, Cr(VI) still had a high affinity for cationic surfactant micelles. In addition, concentration polarization and micelles deposition acted as the main fouling potential during MENF process. This study provides a new insight into technological innovation and environmental protection in the field of wastewater treatment.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106631"},"PeriodicalIF":6.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1016/j.jwpe.2024.106540
Zhuo Zhao, Yue Yin, Guanglei Wang, Changqing Liu
The enhanced removal of phosphate (P) from wastewater is a major challenge for eutrophication control in natural water bodies. Adsorption as a cost-efficient technology has been applied for excessive P removal from wastewater, however, the stability and recyclability of the adsorbents are still challenging. In this study, La(OH)3 was embedded inside the porous sodium alginate aerogel to synthesize a novel millimeter-sized aerogel (LA) for efficient P removal with high stability. Static experiments revealed that the adsorption of P by LA is more consistent with the PSO kinetic model and the Langmuir model; the suitable pH range for P adsorption is wide, and the co-existing substances have little effect on P removal. Specifically, the maximum Langmuir adsorption capacity of LA reached up to 11.6 mg/g at 288 K. The exhausted LA could be effectively regenerated and maintained 81.7 % of its initial adsorption capacity after 5 adsorption-desorption cycles. Regeneration experiments revealed that LA maintained high stability, which could be easily recycled in real operation. The adsorption mechanism of P onto LA was revealed by SEM, BET, XRD, FTIR, and XPS analysis. The predominant pathway for P removal was confirmed to be the inner-sphere complexation between P and La. In addition, the column study exhibited that LA could be used as the column filler to effectively remove P through continuous filtration. Overall, the above results proved LA to be a promising adsorbent for efficient P removal in complex water environments.
加强去除废水中的磷酸盐（P）是控制自然水体富营养化的一大挑战。吸附作为一种具有成本效益的技术，已被用于去除废水中的过量磷酸盐，然而，吸附剂的稳定性和可回收性仍然是一个挑战。本研究将 La(OH)3 嵌入多孔海藻酸钠气凝胶中，合成了一种新型毫米级气凝胶（LA），可高效、稳定地去除 P。静态实验表明，LA对P的吸附更符合PSO动力学模型和Langmuir模型；P吸附的适宜pH范围较宽，共存物质对P的去除影响较小。具体而言，在 288 K 条件下，LA 的最大朗缪尔吸附容量可达 11.6 mg/g；耗尽的 LA 可有效再生，并在 5 次吸附-解吸循环后保持其初始吸附容量的 81.7%。再生实验表明，LA 保持了很高的稳定性，在实际操作中很容易回收利用。通过 SEM、BET、XRD、FTIR 和 XPS 分析，揭示了 P 在 LA 上的吸附机理。经证实，去除 P 的主要途径是 P 与 La 之间的内球络合。此外，柱研究表明，LA 可用作柱填料，通过连续过滤有效去除 P。总之，上述结果证明，LA 是一种有望在复杂水环境中高效去除 P 的吸附剂。
{"title":"Enhanced phosphate removal by La(OH)3 embedded sodium alginate aerogel composites: Batch and column studies","authors":"Zhuo Zhao, Yue Yin, Guanglei Wang, Changqing Liu","doi":"10.1016/j.jwpe.2024.106540","DOIUrl":"10.1016/j.jwpe.2024.106540","url":null,"abstract":"<div><div>The enhanced removal of phosphate (P) from wastewater is a major challenge for eutrophication control in natural water bodies. Adsorption as a cost-efficient technology has been applied for excessive P removal from wastewater, however, the stability and recyclability of the adsorbents are still challenging. In this study, La(OH)<sub>3</sub> was embedded inside the porous sodium alginate aerogel to synthesize a novel millimeter-sized aerogel (LA) for efficient P removal with high stability. Static experiments revealed that the adsorption of P by LA is more consistent with the PSO kinetic model and the Langmuir model; the suitable pH range for P adsorption is wide, and the co-existing substances have little effect on P removal. Specifically, the maximum Langmuir adsorption capacity of LA reached up to 11.6 mg/g at 288 K. The exhausted LA could be effectively regenerated and maintained 81.7 % of its initial adsorption capacity after 5 adsorption-desorption cycles. Regeneration experiments revealed that LA maintained high stability, which could be easily recycled in real operation. The adsorption mechanism of P onto LA was revealed by SEM, BET, XRD, FTIR, and XPS analysis. The predominant pathway for P removal was confirmed to be the inner-sphere complexation between P and La. In addition, the column study exhibited that LA could be used as the column filler to effectively remove P through continuous filtration. Overall, the above results proved LA to be a promising adsorbent for efficient P removal in complex water environments.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106540"},"PeriodicalIF":6.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1016/j.jwpe.2024.106613
Zhicheng Cai , Wenhao Zhang , Gaohao Liao , Chenhan Huang , Jiamei Wang , Jianhao Zhang
Bacteria biofilms are more harmful than their planktonic state and difficult to be completely removed by traditional disinfection technologies. In this study, plasma-activated lactic acid (PALA) were taken to investigate the inhibition efficiency on the formation of Pseudomonas aeruginosa (P. aeruginosa) biofilm. The results showed that the PALA treatment led to a significant accumulation of exogenous reactive oxygen species (ROS) inside the P. aeruginosa cells, companied by decreased activities of antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), and nitrite reductase (NiR). Fourier infrared spectroscopy and transmission electron microscopy-energy dispersive X-ray spectroscopy analysis revealed that the PALA caused the most notable reduction in carbonyl, amino, and nitrogen compounds in P. aeruginosa. Furthermore, liquid chromatograph mass spectrometer (Lc-ms) results demonstrated that PALA effectively blocked the synthesis of C4-HSL, a signaling molecule in P. aeruginosa. Above all, compared with other treatment solutions, PALA has abundant and stable free radical active species, which can effectively block bacterial signal transduction and population aggregation, thus inhibiting the transformation of bacteria to biofilm state. Therefore, this study could provide a theoretical reference for PALA as a potential biofilm disinfectant.
{"title":"Inhibiting mechanism of Pseudomonas aeruginosa biofilm formation - An innovational reagent of plasma-activated lactic acid","authors":"Zhicheng Cai , Wenhao Zhang , Gaohao Liao , Chenhan Huang , Jiamei Wang , Jianhao Zhang","doi":"10.1016/j.jwpe.2024.106613","DOIUrl":"10.1016/j.jwpe.2024.106613","url":null,"abstract":"<div><div>Bacteria biofilms are more harmful than their planktonic state and difficult to be completely removed by traditional disinfection technologies. In this study, plasma-activated lactic acid (PALA) were taken to investigate the inhibition efficiency on the formation of <em>Pseudomonas aeruginosa</em> (<em>P. aeruginosa</em>) biofilm. The results showed that the PALA treatment led to a significant accumulation of exogenous reactive oxygen species (ROS) inside the <em>P. aeruginosa</em> cells, companied by decreased activities of antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), and nitrite reductase (NiR). Fourier infrared spectroscopy and transmission electron microscopy-energy dispersive X-ray spectroscopy analysis revealed that the PALA caused the most notable reduction in carbonyl, amino, and nitrogen compounds in <em>P. aeruginosa</em>. Furthermore, liquid chromatograph mass spectrometer (Lc-ms) results demonstrated that PALA effectively blocked the synthesis of C4-HSL, a signaling molecule in <em>P. aeruginosa</em>. Above all, compared with other treatment solutions, PALA has abundant and stable free radical active species, which can effectively block bacterial signal transduction and population aggregation, thus inhibiting the transformation of bacteria to biofilm state. Therefore, this study could provide a theoretical reference for PALA as a potential biofilm disinfectant.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106613"},"PeriodicalIF":6.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1016/j.jwpe.2024.106643
Xu-Dong Miao , Rui-Xiang Zhang , Wen-Tao Li , Qian Wang , Yu-Han Cai , Yong Guo , Ai-Min Li
The increasing environmental risks associated with tetracycline (TC) have been of widespread interest in the development of adsorbents for the efficient treatment of TC. This work synthesized a high-performance boron carbonitride (BCNvO) with nitrogen-vacancies (Nv) and oxygen-doping (Od) via a hydrogen peroxide mediated strategy. The adsorption capacity of BCNvO-1 for TC (202.85 mg/g) is 1.79 times higher than that of BCN (113.08 mg/g). The adsorption process is well described by the pseudo-second-order kinetic and controlled by surface and intra-pore diffusion. Langmuir can well characterize isothermal adsorption with the fitted maximum adsorption up to 440.53 mg/g. Thermodynamics indicates a spontaneous and endothermic progress in BCNvO-1 adsorption. The abundant pore structures promote pore filling of TC by BCNvO-1. Nv and Od enhance BCNvO-1 proton capture, and the captured protons strengthen hydrogen bonding and electrostatic interactions during adsorption. The functional groups, aromatic regions, and BN rings on BCNvO-1 are involved in hydrogen bonding and π-π stacking to TC. BCNvO-1 has high adsorption performance, great environmental appropriateness and thermal regeneration performance, suggesting good prospects for its potential application in environmental wastewater treatment.
{"title":"Heat-resistant boron Carbonitride with nitrogen-vacancies and oxygen-doping for efficient tetracycline removal: Adsorption characteristics, mechanism and regeneration","authors":"Xu-Dong Miao , Rui-Xiang Zhang , Wen-Tao Li , Qian Wang , Yu-Han Cai , Yong Guo , Ai-Min Li","doi":"10.1016/j.jwpe.2024.106643","DOIUrl":"10.1016/j.jwpe.2024.106643","url":null,"abstract":"<div><div>The increasing environmental risks associated with tetracycline (TC) have been of widespread interest in the development of adsorbents for the efficient treatment of TC. This work synthesized a high-performance boron carbonitride (BCN<sub>v</sub>O) with nitrogen-vacancies (N<sub>v</sub>) and oxygen-doping (O<sub>d</sub>) via a hydrogen peroxide mediated strategy. The adsorption capacity of BCN<sub>v</sub>O-1 for TC (202.85 mg/g) is 1.79 times higher than that of BCN (113.08 mg/g). The adsorption process is well described by the pseudo-second-order kinetic and controlled by surface and intra-pore diffusion. Langmuir can well characterize isothermal adsorption with the fitted maximum adsorption up to 440.53 mg/g. Thermodynamics indicates a spontaneous and endothermic progress in BCN<sub>v</sub>O-1 adsorption. The abundant pore structures promote pore filling of TC by BCN<sub>v</sub>O-1. N<sub>v</sub> and O<sub>d</sub> enhance BCN<sub>v</sub>O-1 proton capture, and the captured protons strengthen hydrogen bonding and electrostatic interactions during adsorption. The functional groups, aromatic regions, and B<img>N rings on BCN<sub>v</sub>O-1 are involved in hydrogen bonding and π-π stacking to TC. BCN<sub>v</sub>O-1 has high adsorption performance, great environmental appropriateness and thermal regeneration performance, suggesting good prospects for its potential application in environmental wastewater treatment.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106643"},"PeriodicalIF":6.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work reports the preparation of a novel hybrid material, integrating a gemini surfactant, butane-1,4-bis(hexadecyldimethylammonium) dibromide, 16-4-16, into bentonite clay (raw Bt), which possessed the ability to remove tartrazine dye (TD) from aqueous solutions. The Bt-16-4-16 hybrid material was characterized through FT-IR, XRD, SEM, EDX, and BET. The results were further compared with previously reported Bt–16-3-16 hybrid material (prepared using propane-1,3-bis(hexadecyldimethylammonium) dibromide, 16-3-16, gemini surfactant). The Bt-16-4-16 and Bt–16-3-16 demonstrated around 97–98 % removal efficiency towards TD under specific experimental conditions examined ([TD] = 10 mg L−1, [adsorbent] = 2 g L−1, pH = 3, equilibrium time = 60 min, temperature = 298.15 K). With the rise in [TD] (from 1 to 100 mg L−1), the hybrid materials showed a prominent rise in adsorption capacity from 0.51 to 44.36 mg g−1 for Bt-16-4-16 and 0.50 to 42.61 mg g−1 for Bt-16-3-16. The efficiency of Bt–16-4-16 and Bt-16-3-16 in the removal of TD was not influenced much by the presence of various cations (Mg2+, Ca2+, Ni2+, Cu2+) and anions (EDTA, sulphate, HCO3¯and SO42−). The presence of 0.1 M NaCl caused a 0.05 % and 1.43 % decrease in the removal efficiency of Bt-16-4-16 and Bt-16-3-16, respectively. The results followed pseudo-second-order adsorption kinetics and agreed with the Freundlich isotherm. The Bt-16-4-16 and Bt-16-3-16 achieved maximum adsorption capacities of 128.7 and 117.8 mg g−1 against TD. The adsorption thermodynamics revealed that the process at the adsorbent's solid-liquid interfaces is entropy-driven, spontaneous, and endothermic. Both Bt-16-4-16 and Bt-16-3-16 were found to be reusable even after the 5th cycle. The Bt–16-4-16 showed a strong affinity towards TD and quickly reached maximum adsorption capacity at a relatively low fugacity of ≤15 kPa. Further, the antibacterial property of Bt-16-4-16 and Bt-16-3-16 was also tested.
{"title":"Adsorption, antibacterial and molecular dynamic studies of bentonite clay–gemini (Bt–16-4-16) hybrid material","authors":"Amlanjyoti Gogoi, Jamsheera Anjudikkal, Anjana P.N., Ajmal Koya Pulikkal","doi":"10.1016/j.jwpe.2024.106602","DOIUrl":"10.1016/j.jwpe.2024.106602","url":null,"abstract":"<div><div>This work reports the preparation of a novel hybrid material, integrating a gemini surfactant, butane-1,4-bis(hexadecyldimethylammonium) dibromide, 16-4-16, into bentonite clay (raw Bt), which possessed the ability to remove tartrazine dye (TD) from aqueous solutions. The Bt-16-4-16 hybrid material was characterized through FT-IR, XRD, SEM, EDX, and BET. The results were further compared with previously reported Bt–16-3-16 hybrid material (prepared using propane-1,3-bis(hexadecyldimethylammonium) dibromide, 16-3-16, gemini surfactant). The Bt-16-4-16 and Bt–16-3-16 demonstrated around 97–98 % removal efficiency towards TD under specific experimental conditions examined ([TD] = 10 mg L<sup>−1</sup>, [adsorbent] = 2 g L<sup>−1</sup>, pH = 3, equilibrium time = 60 min, temperature = 298.15 K). With the rise in [TD] (from 1 to 100 mg L<sup>−1</sup>), the hybrid materials showed a prominent rise in adsorption capacity from 0.51 to 44.36 mg g<sup>−1</sup> for Bt-16-4-16 and 0.50 to 42.61 mg g<sup>−1</sup> for Bt-16-3-16. The efficiency of Bt–16-4-16 and Bt-16-3-16 in the removal of TD was not influenced much by the presence of various cations (Mg<sup>2+</sup>, Ca<sup>2+</sup>, Ni<sup>2+</sup>, Cu<sup>2+</sup>) and anions (EDTA, sulphate, HCO<sub>3</sub>¯and SO<sub>4</sub><sup>2−</sup>). The presence of 0.1 M NaCl caused a 0.05 % and 1.43 % decrease in the removal efficiency of Bt-16-4-16 and Bt-16-3-16, respectively. The results followed pseudo-second-order adsorption kinetics and agreed with the Freundlich isotherm. The Bt-16-4-16 and Bt-16-3-16 achieved maximum adsorption capacities of 128.7 and 117.8 mg g<sup>−1</sup> against TD. The adsorption thermodynamics revealed that the process at the adsorbent's solid-liquid interfaces is entropy-driven, spontaneous, and endothermic. Both Bt-16-4-16 and Bt-16-3-16 were found to be reusable even after the 5<sup>th</sup> cycle. The Bt–16-4-16 showed a strong affinity towards TD and quickly reached maximum adsorption capacity at a relatively low fugacity of ≤15 kPa. Further, the antibacterial property of Bt-16-4-16 and Bt-16-3-16 was also tested.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106602"},"PeriodicalIF":6.3,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-24DOI: 10.1016/j.jwpe.2024.106620
Mullaimalar A., Jeyalakshmi R.
Removal of microplastics (MPs) is complicated due to their minuscule size, large surface area and strong interactions with multiple constituents in water. Since the effectiveness of MP removal is based on surface interactions, the water-repellent surface of alkali activated magnetic inorganic polymers (IPs) from waste slag is optimized by different silane-coupling agents (SCA), namely, hexadecyltrimethoxysilane (HDTMS), aminopropyltrimethoxysilane (APTMS) and mercaptopropyltrimethoxysilane (MPTMS) using a coupled RSM-CCD approach. The critical factors like adsorbent dosage, volume of SCA, time and speed of mixing showed compatible chemical interaction giving rise to a water contact angle of 145.7° against 90° of the unmodified IPs were placed in contact with a solution of carboxylate-functionalized polystyrene latex beads, yellow green labelled in a batch process and detected by fluorescent spectrometry. The results demonstrated that abundant active side chains of SCA-IP provided good adsorption capacity, with a removal efficiency of 98.1 %, 94.2 % and 91.6 % for AP-SCA-IP, HD-SCA-IP and MP-SCA, respectively, at a pH margin of 6–9 at 10 mg L− 1. The adsorption kinetics and thermodynamics and the effect of common ions NaCl, Na2CO3 and Na2SO4 on the removal efficiency is reported. Adsorption mechanisms are mainly deep adsorption on the hydrophobic surface (HB), electrostatic attraction (EA) and van der Walls forces, as analysed by zeta potential, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Collectively, these findings evidenced the multifaceted capabilities of magnetic IPs, heralding a new era for sustainable and efficient water treatment solutions to attain Sustainable Development Goal (SDG) 6.
{"title":"Fabrication of superhydrophobic copper slag-based inorganic polymer adsorbents by silane grafting using response surface methodology for the removal of microplastics from aqueous solutions","authors":"Mullaimalar A., Jeyalakshmi R.","doi":"10.1016/j.jwpe.2024.106620","DOIUrl":"10.1016/j.jwpe.2024.106620","url":null,"abstract":"<div><div>Removal of microplastics (MPs) is complicated due to their minuscule size, large surface area and strong interactions with multiple constituents in water. Since the effectiveness of MP removal is based on surface interactions, the water-repellent surface of alkali activated magnetic inorganic polymers (IPs) from waste slag is optimized by different silane-coupling agents (SCA), namely, hexadecyltrimethoxysilane (HDTMS), aminopropyltrimethoxysilane (APTMS) and mercaptopropyltrimethoxysilane (MPTMS) using a coupled RSM-CCD approach. The critical factors like adsorbent dosage, volume of SCA, time and speed of mixing showed compatible chemical interaction giving rise to a water contact angle of 145.7° against 90° of the unmodified IPs were placed in contact with a solution of carboxylate-functionalized polystyrene latex beads, yellow green labelled in a batch process and detected by fluorescent spectrometry. The results demonstrated that abundant active side chains of SCA-IP provided good adsorption capacity, with a removal efficiency of 98.1 %, 94.2 % and 91.6 % for AP-SCA-IP, HD-SCA-IP and MP-SCA, respectively, at a pH margin of 6–9 at 10 mg L<sup>− 1</sup>. The adsorption kinetics and thermodynamics and the effect of common ions NaCl, Na<sub>2</sub>CO<sub>3</sub> and Na<sub>2</sub>SO<sub>4</sub> on the removal efficiency is reported. Adsorption mechanisms are mainly deep adsorption on the hydrophobic surface (HB), electrostatic attraction (EA) and van der Walls forces, as analysed by zeta potential, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Collectively, these findings evidenced the multifaceted capabilities of magnetic IPs, heralding a new era for sustainable and efficient water treatment solutions to attain Sustainable Development Goal (SDG) 6.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106620"},"PeriodicalIF":6.3,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-24DOI: 10.1016/j.jwpe.2024.106592
Yi Zhou , Wenwen Tan , Jingyi Ye , Yi Xiao , Yanling Liu , Chenglun Liu , Qi Feng , Longjun Xu
The choice of anode material is crucial in determining the performance of microbial fuel cells (MFCs). In the current study, a novel nickel-doped coal-based porous carbon (CPC-N) is prepared by the metal doping method. CPC-N exhibits improvements in specific surface area (2042.5 m2/g), electrical conductivity (the apparent internal resistance is only 202.6 Ω), graphitization (the d002 is 0.359), biocompatibility, and catalytic properties (the maximum current density can reach 21.2 A/m2, 6.4 times than CC). The CPC-N anode demonstrates superior power production in a dual-chamber microbial fuel cell treating mixed wastewater of shale gas flowback wastewater (SGFW) and aging landfill leachate (LFL) with a maximum stabilized output voltage of 633.4 mV and a maximum power density of 1129.7 mW/m2. Meanwhile, the CPC-N anode also achieves degradation rates of 48.5 ± 2.1 % for chemical oxygen demand (COD) and 61.0 ± 1.4 % for ammonia nitrogen (NH3−N), showcasing its effectiveness in pollutant removal. Electrochemical tests show that CPC-N anodes significantly reduced the charge transfer resistance, and improved the exchange current density and capacitance performance. Community analysis shows that nickel doping could enhance the diversity and evenness of anode microorganisms. Moreover, the relative abundance of Desulfobacterota, Bacteroidota, Firmicutes, and Proteobacteria at the phylum level, while Desulfuromonas and Lentimicrobium at the genus level are comparatively higher on the CPC-N anode. These findings offer an exciting avenue for improving the performance of carbon-based-anode MFC.
{"title":"Nickel-doped porous carbon anode microbial fuel cell to enhance the performance in wastewater treatment","authors":"Yi Zhou , Wenwen Tan , Jingyi Ye , Yi Xiao , Yanling Liu , Chenglun Liu , Qi Feng , Longjun Xu","doi":"10.1016/j.jwpe.2024.106592","DOIUrl":"10.1016/j.jwpe.2024.106592","url":null,"abstract":"<div><div>The choice of anode material is crucial in determining the performance of microbial fuel cells (MFCs). In the current study, a novel nickel-doped coal-based porous carbon (CPC-N) is prepared by the metal doping method. CPC-N exhibits improvements in specific surface area (2042.5 m<sup>2</sup>/g), electrical conductivity (the apparent internal resistance is only 202.6 Ω), graphitization (the d<sub>002</sub> is 0.359), biocompatibility, and catalytic properties (the maximum current density can reach 21.2 A/m<sup>2</sup>, 6.4 times than CC). The CPC-N anode demonstrates superior power production in a dual-chamber microbial fuel cell treating mixed wastewater of shale gas flowback wastewater (SGFW) and aging landfill leachate (LFL) with a maximum stabilized output voltage of 633.4 mV and a maximum power density of 1129.7 mW/m<sup>2</sup>. Meanwhile, the CPC-N anode also achieves degradation rates of 48.5 ± 2.1 % for chemical oxygen demand (COD) and 61.0 ± 1.4 % for ammonia nitrogen (NH<sub>3</sub>−N), showcasing its effectiveness in pollutant removal. Electrochemical tests show that CPC-N anodes significantly reduced the charge transfer resistance, and improved the exchange current density and capacitance performance. Community analysis shows that nickel doping could enhance the diversity and evenness of anode microorganisms. Moreover, the relative abundance of <em>Desulfobacterota</em>, <em>Bacteroidota</em>, <em>Firmicutes</em>, and <em>Proteobacteria</em> at the phylum level, while <em>Desulfuromonas</em> and <em>Lentimicrobium</em> at the genus level are comparatively higher on the CPC-N anode. These findings offer an exciting avenue for improving the performance of carbon-based-anode MFC.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106592"},"PeriodicalIF":6.3,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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