Emerging Pollutants (EPs), including Pharmaceuticals and Personal care products (PPCPs) (particularly antibiotics) and microplastics (MPs), have posed significant threats to the global water environment and human health due to their widespread presence and high environmental risks. Constructed wetlands (CWs), as a low-cost, eco-friendly green infrastructure, have gained increasing attention for the EPs purification, particularly over the past decade. Numerous studies have shown that CWs are capable of removing 134 types of PPCPs and various microplastics. This paper reviews the literature on the removal of EPs using CWs from 2014 to 2024. The review provides a detailed analysis of CWs types, plants and substrate selection, operational parameters, environmental factors, and the physicochemical properties of EPs. Additionally, the review elaborates on the multiple effects of plants, substrates, and microorganisms in the removal of EPs through physical, chemical, and biological processes. Furthermore, future perspectives and knowledge gaps related to CWs for EPs removal are identified, aiming to offer scientific guidance for further research and large-scale engineering applications.
{"title":"Constructed wetlands for emerging pollutants removal: A decade of advances and future directions (2014–2024)","authors":"Yunjie Hou , Baiming Ren , Xiaofeng Li , Arsenia Luana Buque , Yaqian Zhao","doi":"10.1016/j.jwpe.2024.106533","DOIUrl":"10.1016/j.jwpe.2024.106533","url":null,"abstract":"<div><div>Emerging Pollutants (EPs), including Pharmaceuticals and Personal care products (PPCPs) (particularly antibiotics) and microplastics (MPs), have posed significant threats to the global water environment and human health due to their widespread presence and high environmental risks. Constructed wetlands (CWs), as a low-cost, eco-friendly green infrastructure, have gained increasing attention for the EPs purification, particularly over the past decade. Numerous studies have shown that CWs are capable of removing 134 types of PPCPs and various microplastics. This paper reviews the literature on the removal of EPs using CWs from 2014 to 2024. The review provides a detailed analysis of CWs types, plants and substrate selection, operational parameters, environmental factors, and the physicochemical properties of EPs. Additionally, the review elaborates on the multiple effects of plants, substrates, and microorganisms in the removal of EPs through physical, chemical, and biological processes. Furthermore, future perspectives and knowledge gaps related to CWs for EPs removal are identified, aiming to offer scientific guidance for further research and large-scale engineering applications.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106533"},"PeriodicalIF":6.3,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702146","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 : 2024-11-23DOI: 10.1016/j.jwpe.2024.106590
Mengqin You , Yufeng Tang , Xi Liang, Tangxuan Deng, Hailong Peng, Jianwen Tian, Jun Du
The misuse of antibiotics, including tetracycline hydrochloride (TCH), can easily lead to drug resistance and the decline of human immunity, which is extremely harmful to human health. In this paper, TiO2 was modified using two different techniques: semiconductor composite and metal ion doping. Fe-TiO2/MIL-101 (Cr) nanocomposite photocatalyst (FTM-x) was effectively prepared by solvothermal method and used for the degradation of TCH in water under visible light. The performance of ternary composite materials, in comparison to single or binary compounds, are improved by using an easy and convenient hydrothermal technique. Among them, FTM-2 showed efficient photodegradation and structural stability. After 120 min in visible light, FTM-2 removed 95.5 % of TCH, and the removal was maintained at 85 % after 4 cycles. The composite FTM-x was characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Raman, which proved the successful synthesis of the composite. Photoelectrochemical and photoluminescence (PL) analyses were used to examine the photoelectric properties of the prepared photocatalysts. The results suggested that optimizing the composites' photoresponse and electron-hole separation could be linked to improving the photocatalytic performance. The photocatalytic activity of superoxide radicals (O2−) and hydroxyl radicals (OH) was demonstrated to be mediated by free radical trapping investigations, which were utilized to determine the active components of the process.
{"title":"Efficient photocatalytic degradation of tetracycline hydrochloride by Fe-TiO2/MIL-101(Cr) nanocomposites under visible light","authors":"Mengqin You , Yufeng Tang , Xi Liang, Tangxuan Deng, Hailong Peng, Jianwen Tian, Jun Du","doi":"10.1016/j.jwpe.2024.106590","DOIUrl":"10.1016/j.jwpe.2024.106590","url":null,"abstract":"<div><div>The misuse of antibiotics, including tetracycline hydrochloride (TCH), can easily lead to drug resistance and the decline of human immunity, which is extremely harmful to human health. In this paper, TiO<sub>2</sub> was modified using two different techniques: semiconductor composite and metal ion doping. Fe-TiO<sub>2</sub>/MIL-101 (Cr) nanocomposite photocatalyst (FTM-x) was effectively prepared by solvothermal method and used for the degradation of TCH in water under visible light. The performance of ternary composite materials, in comparison to single or binary compounds, are improved by using an easy and convenient hydrothermal technique. Among them, FTM-2 showed efficient photodegradation and structural stability. After 120 min in visible light, FTM-2 removed 95.5 % of TCH, and the removal was maintained at 85 % after 4 cycles. The composite FTM-x was characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Raman, which proved the successful synthesis of the composite. Photoelectrochemical and photoluminescence (PL) analyses were used to examine the photoelectric properties of the prepared photocatalysts. The results suggested that optimizing the composites' photoresponse and electron-hole separation could be linked to improving the photocatalytic performance. The photocatalytic activity of superoxide radicals (<img>O<sub>2</sub><sup>−</sup>) and hydroxyl radicals (<img>OH) was demonstrated to be mediated by free radical trapping investigations, which were utilized to determine the active components of the process.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106590"},"PeriodicalIF":6.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702422","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 : 2024-11-23DOI: 10.1016/j.jwpe.2024.106605
Asmae Snik , Mohamed Larzek , Abdeslam El Bouari
This study presents the synthesis of graphene-based nanocomposites (Cu@G, Cu@FA, and Cu@FN) using an innovative one-step aqueous-phase chemical reduction method. Unlike conventional techniques, this novel approach allows precise control over the size and distribution of nano-zerovalent copper (nZVCu0) on functionalized graphene under environmentally friendly conditions. The nanocomposites were characterized using XRD, FTIR, TGA, AAS, SEM-EDX, and TEM-EDX, confirming successful nZVCu0 immobilization. Functional groups (-OH, -COOH, -NH2) significantly enhanced adsorption efficiency through π-π stacking, n-π interactions, and electrostatic attractions. For methylene blue (MB) removal, Cu@FN exhibited the highest adsorption capacity (260.45 mg/g), followed by Cu@FA (202.71 mg/g) and Cu@G (143.19 mg/g). Thermodynamic and kinetic analyses revealed that adsorption is governed by both physisorption and chemisorption, ensuring stability and high performance. The nanocomposites demonstrated reusability over five adsorption-desorption cycles, with Cu@FN retaining 94 % efficiency. Applied to industrial textile wastewater, Cu@FN maintained a 99 % removal efficiency, underscoring its potential for large-scale wastewater treatment. This study introduces a scalable method for nZVCu0 immobilization, establishing Cu@FN as a promising material for industrial wastewater treatment and environmental remediation due to its excellent adsorption capacity, stability, and reusability.
{"title":"Innovative aqueous-phase synthesized graphene nanocomposites with nano-zerovalent copper for efficient industrial wastewater treatment","authors":"Asmae Snik , Mohamed Larzek , Abdeslam El Bouari","doi":"10.1016/j.jwpe.2024.106605","DOIUrl":"10.1016/j.jwpe.2024.106605","url":null,"abstract":"<div><div>This study presents the synthesis of graphene-based nanocomposites (Cu@G, Cu@FA, and Cu@FN) using an innovative one-step aqueous-phase chemical reduction method. Unlike conventional techniques, this novel approach allows precise control over the size and distribution of nano-zerovalent copper (nZVCu<sup>0</sup>) on functionalized graphene under environmentally friendly conditions. The nanocomposites were characterized using XRD, FTIR, TGA, AAS, SEM-EDX, and TEM-EDX, confirming successful nZVCu<sup>0</sup> immobilization. Functional groups (-OH, -COOH, -NH<sub>2</sub>) significantly enhanced adsorption efficiency through π-π stacking, n-π interactions, and electrostatic attractions. For methylene blue (MB) removal, Cu@FN exhibited the highest adsorption capacity (260.45 mg/g), followed by Cu@FA (202.71 mg/g) and Cu@G (143.19 mg/g). Thermodynamic and kinetic analyses revealed that adsorption is governed by both physisorption and chemisorption, ensuring stability and high performance. The nanocomposites demonstrated reusability over five adsorption-desorption cycles, with Cu@FN retaining 94 % efficiency. Applied to industrial textile wastewater, Cu@FN maintained a 99 % removal efficiency, underscoring its potential for large-scale wastewater treatment. This study introduces a scalable method for nZVCu<sup>0</sup> immobilization, establishing Cu@FN as a promising material for industrial wastewater treatment and environmental remediation due to its excellent adsorption capacity, stability, and reusability.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106605"},"PeriodicalIF":6.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702356","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 : 2024-11-23DOI: 10.1016/j.jwpe.2024.106569
Khalil M.A. Qasem , Mohammad Yasir Khan , Shaikh Arfa Akmal , Hatem A.M. Saleh , Mohd Mehtab , M. Shahid , Mansour A.S. Salem , Mohammad Mujahid Ali Khan , Younes S.A. Ghanem , Abdul Malik , Abdul Moheman
This study focuses on synthesizing hybrid nanocomposites (HNCs) through a one-step solvothermal method, combining highly crystalline and evenly dispersed copper-based coordination polymer (Cu-CP), graphene oxide (GO), and carbon nanotubes (CNTs). Extensive characterization using elemental analysis, SEM, TEM, EDX, XRD, FT-IR, Raman spectroscopy, TGA, and crystallographic studies confirm the properties of the nanocomposites, with PXRD investigation supporting their clear crystalline structure. Morphological and elemental studies reveal effective adsorption of copper-benzoic acid-containing Cu-CP onto GO and CNT substrates. The synthesized nanocomposites exhibit superior adsorption capacity for iodine (I2), a model radioactive pollutant, attributed to decreased CP size and larger surface area. The strong affinity for I2 arises from various interactions, including conjugated π-electron aromatic systems and halogen bonds. Cu-CP, Cu-CP@GO, and Cu-CP@CNT adsorbents efficiently extract toxic iodine from hexane solution, achieving a substantial capture capacity of 347.85 mg/g over 24 h. In the vapor phase, Cu-CP@GO exhibits an even higher capacity (951.52 mg/g within 25 h). Moreover, the application of Cu-CP, Cu-CP@GO, and Cu-CP@CNT in environmental protection showcases their efficacy in removing cationic and anionic dyes, particularly highlighting remarkable cationic dye selectivity through cation-π and π-π interactions. This research underscores the promising potential of these HNCs in addressing environmental challenges and pollutant remediation.
{"title":"Highly efficient iodine capture and selective adsorption and removal of cationic dyes by using a copper-based coordination polymer decorated over graphene oxide and carbon nanotubes","authors":"Khalil M.A. Qasem , Mohammad Yasir Khan , Shaikh Arfa Akmal , Hatem A.M. Saleh , Mohd Mehtab , M. Shahid , Mansour A.S. Salem , Mohammad Mujahid Ali Khan , Younes S.A. Ghanem , Abdul Malik , Abdul Moheman","doi":"10.1016/j.jwpe.2024.106569","DOIUrl":"10.1016/j.jwpe.2024.106569","url":null,"abstract":"<div><div>This study focuses on synthesizing hybrid nanocomposites (HNCs) through a one-step solvothermal method, combining highly crystalline and evenly dispersed copper-based coordination polymer (Cu-CP), graphene oxide (GO), and carbon nanotubes (CNTs). Extensive characterization using elemental analysis, SEM, TEM, EDX, XRD, FT-IR, Raman spectroscopy, TGA, and crystallographic studies confirm the properties of the nanocomposites, with PXRD investigation supporting their clear crystalline structure. Morphological and elemental studies reveal effective adsorption of copper-benzoic acid-containing Cu-CP onto GO and CNT substrates. The synthesized nanocomposites exhibit superior adsorption capacity for iodine (I<sub>2</sub>), a model radioactive pollutant, attributed to decreased CP size and larger surface area. The strong affinity for I<sub>2</sub> arises from various interactions, including conjugated π-electron aromatic systems and halogen bonds. Cu-CP, Cu-CP@GO, and Cu-CP@CNT adsorbents efficiently extract toxic iodine from hexane solution, achieving a substantial capture capacity of 347.85 mg/g over 24 h. In the vapor phase, Cu-CP@GO exhibits an even higher capacity (951.52 mg/g within 25 h). Moreover, the application of Cu-CP, Cu-CP@GO, and Cu-CP@CNT in environmental protection showcases their efficacy in removing cationic and anionic dyes, particularly highlighting remarkable cationic dye selectivity through cation-π and π-π interactions. This research underscores the promising potential of these HNCs in addressing environmental challenges and pollutant remediation.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106569"},"PeriodicalIF":6.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702403","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 : 2024-11-23DOI: 10.1016/j.jwpe.2024.106604
Farhan Javed , Muhammad Fahad Tariq , Amir Ikhlaq , Hafiz Muhammad Shahzad Munir , Ali Altaee
Large-scale industrial wet processing generates high volumes of wastewater, causing a continuous disruption of the clean environment. Textile wastewater contains high mass loadings of contaminants, which poses a challenge to the environment and requires adequate treatment. This study aims to investigate the treatment of textile wastewater by catalytic ozonation coupled with electrocoagulation using ZIF 67 as a catalyst in a hybrid reactor. This research explores the first application of ZIF-67 in a hybrid system with catalytic ozonation and electrocoagulation processes to treat real textile effluent. The initial characterization of wastewater indicated high pollutant loads such as 480 mg/L chemical oxygen demand (COD) and 210 mg/L biological oxygen demand (COD). The influence of operational parameters like current density, ozone dose, pH, and catalyst dose were studied. The heterogeneous catalytic ozonation-electrocoagulation (HCOP-EC) process achieved 79.6 % decolorization, 73.3 % COD removal, and 69.04 % BOD after 30 min of treatment at optimal conditions of pH 9, ozone dose 0.3 mg/min, current density 15.2 mA/cm2, and catalyst dose 50 mg/L. The catalyst reusability study showed an efficient performance of up to 3 cycles. Due to the complex matrix nature of the real effluents, the HCOP-EC combined process may be effectively applied to remediate pollutant loads in real textile wastewater.
{"title":"Remediation of textile wastewater by hybrid technique using ZIF-67 catalyzed ozonation coupled with electrocoagulation","authors":"Farhan Javed , Muhammad Fahad Tariq , Amir Ikhlaq , Hafiz Muhammad Shahzad Munir , Ali Altaee","doi":"10.1016/j.jwpe.2024.106604","DOIUrl":"10.1016/j.jwpe.2024.106604","url":null,"abstract":"<div><div>Large-scale industrial wet processing generates high volumes of wastewater, causing a continuous disruption of the clean environment. Textile wastewater contains high mass loadings of contaminants, which poses a challenge to the environment and requires adequate treatment. This study aims to investigate the treatment of textile wastewater by catalytic ozonation coupled with electrocoagulation using ZIF 67 as a catalyst in a hybrid reactor. This research explores the first application of ZIF-67 in a hybrid system with catalytic ozonation and electrocoagulation processes to treat real textile effluent. The initial characterization of wastewater indicated high pollutant loads such as 480 mg/L chemical oxygen demand (COD) and 210 mg/L biological oxygen demand (COD). The influence of operational parameters like current density, ozone dose, pH, and catalyst dose were studied. The heterogeneous catalytic ozonation-electrocoagulation (HCOP-EC) process achieved 79.6 % decolorization, 73.3 % COD removal, and 69.04 % BOD after 30 min of treatment at optimal conditions of pH 9, ozone dose 0.3 mg/min, current density 15.2 mA/cm<sup>2</sup>, and catalyst dose 50 mg/L. The catalyst reusability study showed an efficient performance of up to 3 cycles. Due to the complex matrix nature of the real effluents, the HCOP-EC combined process may be effectively applied to remediate pollutant loads in real textile wastewater.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106604"},"PeriodicalIF":6.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702419","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}
While several studies have used plastic-derived graphene (PDG) for antibiotics adsorption from wastewater, there is a research gap in finding an environmental-friendly and technically feasible approach for the recycling of exhausted adsorbent. Hence, this study focuses on the utilization of PDG as an adsorbent for tetracycline removal from aqueous solutions, followed by the valorization of spent PDG for dual biogas and biochar production. In the first experiment, a tetracycline removal efficiency of 75.61 % was obtained under the optimum condition of PDG dosage = 0.03 mg/mL, initial concentration = 5.20 ppm, 77.0 min-adsorption time, and acidic pH. Supplementing the regenerated PDG to the anaerobic digestion of sludge and ethanol exhibited bio-CH4 yield and chemical oxygen demand (COD) removal efficiency of 200.60±9.40 mL/g COD and 57.11±3.01 %, respectively. The recycling of anaerobic digestate by pyrolysis showed a biochar yield of 0.58±0.09 g/g, with a high carbon content of 55.34 % w/w. The scalability of this adsorption/digestion/pyrolysis approach for managing 1 kg PDG could be economically feasible with a payback period of 5.02 years, NPV = 297.62 USD, and internal rate of return = 10 %. This project showed less detrimental impacts on the environment, regarding the life cycle assessment (LCA) impact categories related to terrestrial ecosystem and resource recovery.
{"title":"Sustainable utilization of plastic-derived graphene for tetracycline wastewater treatment and its recycling for biogas and biochar production","authors":"Gideon Mensah-Sackey , Hassan Shokry , Manabu Fujii , Mahmoud Nasr","doi":"10.1016/j.jwpe.2024.106554","DOIUrl":"10.1016/j.jwpe.2024.106554","url":null,"abstract":"<div><div>While several studies have used plastic-derived graphene (PDG) for antibiotics adsorption from wastewater, there is a research gap in finding an environmental-friendly and technically feasible approach for the recycling of exhausted adsorbent. Hence, this study focuses on the utilization of PDG as an adsorbent for tetracycline removal from aqueous solutions, followed by the valorization of spent PDG for dual biogas and biochar production. In the first experiment, a tetracycline removal efficiency of 75.61 % was obtained under the optimum condition of PDG dosage = 0.03 mg/mL, initial concentration = 5.20 ppm, 77.0 min-adsorption time, and acidic pH. Supplementing the regenerated PDG to the anaerobic digestion of sludge and ethanol exhibited bio-CH<sub>4</sub> yield and chemical oxygen demand (COD) removal efficiency of 200.60±9.40 mL/g COD and 57.11±3.01 %, respectively. The recycling of anaerobic digestate by pyrolysis showed a biochar yield of 0.58±0.09 g/g, with a high carbon content of 55.34 % w/w. The scalability of this adsorption/digestion/pyrolysis approach for managing 1 kg PDG could be economically feasible with a payback period of 5.02 years, NPV = 297.62 USD, and internal rate of return = 10 %. This project showed less detrimental impacts on the environment, regarding the life cycle assessment (LCA) impact categories related to terrestrial ecosystem and resource recovery.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106554"},"PeriodicalIF":6.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702276","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 : 2024-11-23DOI: 10.1016/j.jwpe.2024.106570
Jie Zhou , Eldon R. Rene , Qian Hu , Bin Qiu
Conductive materials are known to enhance methane production in anaerobic treatment process by facilitating direct interspecies electron transfer (DIET). However, the role of the porous structure of conductive materials in electron transfer remains underexplored. Polyaniline (PANI) was used as conductive materials in this study due to its easily controlled porosity, investigating how surface area and pore size affect methane production. It was demonstrated that the porosity of PANI is an important factor affecting methane production by anaerobic sludge. Methane production rate of 41.2 mL/h was achieved with the high-porosity PANI, which was ~73.2% higher than the control group. The porous PANI enhanced the electric field in the anaerobic sludge, facilitating the enrichment of electrogenic bacteria and archaea. In the anaerobic system supplemented with porous PANI, the maximum accumulation of acetic acid reached 3.72 mM. The abundance of electroactive bacteria Clostridium involved in DIET increased by 2.13-fold, while the abundance of electroactive archaea Methanosaeta and Methanobacterium, which also participate in DIET, rose by 1.55-fold. The porous structure of PANI promotes DIET and enhances aceticlastic methanogenesis.
众所周知，导电材料可通过促进种间直接电子传递（DIET）来提高厌氧处理过程中的甲烷产量。然而，导电材料的多孔结构在电子传递中的作用仍未得到充分探索。聚苯胺（PANI）的孔隙率易于控制，因此本研究将其用作导电材料，研究表面积和孔隙大小如何影响甲烷的产生。结果表明，PANI 的孔隙率是影响厌氧污泥甲烷产量的一个重要因素。高孔隙率 PANI 的甲烷生产率达到 41.2 mL/h，比对照组高出约 73.2%。多孔 PANI 增强了厌氧污泥中的电场，促进了电生细菌和古细菌的富集。在添加了多孔 PANI 的厌氧系统中，乙酸的最大累积量达到了 3.72 mM。参与 DIET 的电活性细菌梭状芽孢杆菌的丰度增加了 2.13 倍，而同样参与 DIET 的电活性古细菌甲烷菌和甲烷杆菌的丰度增加了 1.55 倍。PANI 的多孔结构促进了 DIET 并增强了醋酸菌的甲烷生成。
{"title":"Regulating the porous properties of polyaniline enhances the electron transfer process and methane production during anaerobic wastewater treatment","authors":"Jie Zhou , Eldon R. Rene , Qian Hu , Bin Qiu","doi":"10.1016/j.jwpe.2024.106570","DOIUrl":"10.1016/j.jwpe.2024.106570","url":null,"abstract":"<div><div>Conductive materials are known to enhance methane production in anaerobic treatment process by facilitating direct interspecies electron transfer (DIET). However, the role of the porous structure of conductive materials in electron transfer remains underexplored. Polyaniline (PANI) was used as conductive materials in this study due to its easily controlled porosity, investigating how surface area and pore size affect methane production. It was demonstrated that the porosity of PANI is an important factor affecting methane production by anaerobic sludge. Methane production rate of 41.2 mL/h was achieved with the high-porosity PANI, which was ~73.2% higher than the control group. The porous PANI enhanced the electric field in the anaerobic sludge, facilitating the enrichment of electrogenic bacteria and archaea. In the anaerobic system supplemented with porous PANI, the maximum accumulation of acetic acid reached 3.72 mM. The abundance of electroactive bacteria <em>Clostridium</em> involved in DIET increased by 2.13-fold, while the abundance of electroactive archaea <em>Methanosaeta</em> and <em>Methanobacterium</em>, which also participate in DIET, rose by 1.55-fold. The porous structure of PANI promotes DIET and enhances aceticlastic methanogenesis.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106570"},"PeriodicalIF":6.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702131","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 : 2024-11-23DOI: 10.1016/j.jwpe.2024.106553
Long Fang , Xi Zheng , Ruina Yuan , Tianyuan Xu , Minwang Laipan , Yijun Cao , Yaowen Xing , Xiahui Gui
Persulfate (PS)-based advanced oxidation process is an excellent technology for removing organic pollutants. Herein, an Al-Fe‑carbon hybrid composite (AlFeOH/CS) by hybridizing bimetal Al-Fe and carbon sphere was synthesized and its ability to activate PS was evaluated. Within 120 min reaction in the presence of PS, 70 % of aniline was removed by FeOH/CS, while >99.9 % of aniline was degraded by AlFeOH/CS. Moreover, AlFeOH/CS exhibited wide pH applicability, relatively high resistance to inorganic anions, and strong stability for PS activation. Electron paramagnetic resonance (EPR) and quenching tests revealed that aniline degradation in the AlFeOH/CS/PS system occurred via a radical pathway, with O2− the dominant reactive oxygen species. The enhanced photocatalytic activity of AlFeOH/CS was attributed to: Al doping could 1) increase the specific surface area and porosity, exposing more active sites, 2) facilitate electron transfer from Fe atoms to PS, and 3) enhance the generation of carbon-centered persistent free radicals (PFRs). Depending on the carbon-centered PFRs, carbonyl functional groups, sp2 and sp3-hybridized carbon, and Fe/Al hydroxides on AlFeOH/CS, PS was effectively activated to produce free radicals for aniline degradation. These findings provide new insights into the design of functional hydrothermal carbonaceous material with high stability and PS activation efficiency for removing organic contaminants.
{"title":"Synergistic enhancement of persulfate activation by Al-Fe‑carbon hybrid composite for aniline degradation in water","authors":"Long Fang , Xi Zheng , Ruina Yuan , Tianyuan Xu , Minwang Laipan , Yijun Cao , Yaowen Xing , Xiahui Gui","doi":"10.1016/j.jwpe.2024.106553","DOIUrl":"10.1016/j.jwpe.2024.106553","url":null,"abstract":"<div><div>Persulfate (PS)-based advanced oxidation process is an excellent technology for removing organic pollutants. Herein, an Al-Fe‑carbon hybrid composite (AlFeOH/CS) by hybridizing bimetal Al-Fe and carbon sphere was synthesized and its ability to activate PS was evaluated. Within 120 min reaction in the presence of PS, 70 % of aniline was removed by FeOH/CS, while >99.9 % of aniline was degraded by AlFeOH/CS. Moreover, AlFeOH/CS exhibited wide pH applicability, relatively high resistance to inorganic anions, and strong stability for PS activation. Electron paramagnetic resonance (EPR) and quenching tests revealed that aniline degradation in the AlFeOH/CS/PS system occurred via a radical pathway, with O<sub>2</sub><img><sup>−</sup> the dominant reactive oxygen species. The enhanced photocatalytic activity of AlFeOH/CS was attributed to: Al doping could 1) increase the specific surface area and porosity, exposing more active sites, 2) facilitate electron transfer from Fe atoms to PS, and 3) enhance the generation of carbon-centered persistent free radicals (PFRs). Depending on the carbon-centered PFRs, carbonyl functional groups, <em>sp</em><sup><em>2</em></sup> and <em>sp</em><sup><em>3</em></sup>-hybridized carbon, and Fe/Al hydroxides on AlFeOH/CS, PS was effectively activated to produce free radicals for aniline degradation. These findings provide new insights into the design of functional hydrothermal carbonaceous material with high stability and PS activation efficiency for removing organic contaminants.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106553"},"PeriodicalIF":6.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702275","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 : 2024-11-23DOI: 10.1016/j.jwpe.2024.106564
Sen Li , Jiahui Zhang , Yan Liu , Nanchuan Song , Wenli Li , Longqing Tang , Huaili Zheng , Yixin Zhang , Yuxin Chen , Shixin Zhang
Microbial flocculants have attracted tremendous attention because of its extraordinary flocculating activity and degradability to create a green and healthy environment. Using microbial flocculants to partially replace chemically synthesized agents is a sustainable strategy. Currently reported literatures lack a deep correlation in terms of structure-flocculation activity relationship, flocculation mechanism and the integration with intelligent technology. There is also a lack of systematic sorting and analysis of the recent findings and pioneering applications of microbial flocculants. This review comprehensively summarizes their sources, unique molecular structure and flocculation mechanism. It also delves into their applications in five types of wastewater. The factors that limit the widespread use of microbial flocculants are discussed. To overcome these limitations, this review summarized and deeply discussed five recent progress of microbial flocculants. Finally, it presents a viewpoint that incorporate innovative technologies and methodologies to facilitate their advancement into a new developmental phase (The combination of microbial flocculant with biotechnology and AI are feasible directions). This review will assist in the comprehensive understanding of the microbial flocculant and provides novel insight into the challenges posed by wastewater pollutants.
{"title":"Microbial flocculants for removing multiple pollutants in wastewater: A review of recent trends and perspectives","authors":"Sen Li , Jiahui Zhang , Yan Liu , Nanchuan Song , Wenli Li , Longqing Tang , Huaili Zheng , Yixin Zhang , Yuxin Chen , Shixin Zhang","doi":"10.1016/j.jwpe.2024.106564","DOIUrl":"10.1016/j.jwpe.2024.106564","url":null,"abstract":"<div><div>Microbial flocculants have attracted tremendous attention because of its extraordinary flocculating activity and degradability to create a green and healthy environment. Using microbial flocculants to partially replace chemically synthesized agents is a sustainable strategy. Currently reported literatures lack a deep correlation in terms of structure-flocculation activity relationship, flocculation mechanism and the integration with intelligent technology. There is also a lack of systematic sorting and analysis of the recent findings and pioneering applications of microbial flocculants. This review comprehensively summarizes their sources, unique molecular structure and flocculation mechanism. It also delves into their applications in five types of wastewater. The factors that limit the widespread use of microbial flocculants are discussed. To overcome these limitations, this review summarized and deeply discussed five recent progress of microbial flocculants. Finally, it presents a viewpoint that incorporate innovative technologies and methodologies to facilitate their advancement into a new developmental phase (The combination of microbial flocculant with biotechnology and AI are feasible directions). This review will assist in the comprehensive understanding of the microbial flocculant and provides novel insight into the challenges posed by wastewater pollutants.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106564"},"PeriodicalIF":6.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702141","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 : 2024-11-22DOI: 10.1016/j.jwpe.2024.106586
Malihe Afrooz , Rahman Zeynali , Jafar Soltan , Kerry N. McPhedran
Perfluoroalkyl substances (PFAS), like perfluorooctanoic acid (PFOA), are of concern worldwide given they are ubiquitous in the environment. In this study, the treatment of PFOA-contaminated water was assessed using biochar adsorbents produced from raw canola straw (RCS) through chemical activation with H3PO4 and ZnCl2 and microwave-assisted pyrolysis (MWP). MWP conditions were evaluated to create optimal H3PO4-treated (PBC) and ZnCl2-treated (ZnBC) biochar adsorbents with treatments determined using a central composite design (CCD) based on the response surface methodology (RSM) considering activator concentration, and microwave heating time and power. The highest PFOA removal efficiency for PBC (3.0 mol/L) was achieved at 92 % (368 μg/g), while for ZnBC (0.55 mol/L) it was 84 % (336 μg/g). In contrast, untreated biochar and RCS had markedly lower PFOA removals of 5 % and 1 %, respectively. Activation of biochar under optimal pyrolysis conditions (6 min at 600 W) led to increased chemical functional groups, porosity, and surface area, as confirmed by FT-IR, XPS, and BET. The kinetic study indicated that chemisorption was the primary PFOA adsorption mechanism, while the Freundlich isotherm model suggested heterogeneous multilayer adsorption for PFOA removal. Further, background salts enhanced PFOA adsorption through divalent bridges and salting-out mechanisms. PBC and ZnBC adsorbents performed well over a broad pH range of 3 to 9. Lastly, Yan and Yoon-Nelson models were used to assess adsorption breakthrough for a model fixed-bed adsorption system. This study exhibits that PBC and ZnBC adsorbents, derived from accessible biomass, offer an environmentally friendly solution to remove PFOA from contaminated water.
{"title":"A novel biochar adsorbent for treatment of perfluorooctanoic acid (PFOA) contaminated water: Exploring batch and dynamic adsorption behavior","authors":"Malihe Afrooz , Rahman Zeynali , Jafar Soltan , Kerry N. McPhedran","doi":"10.1016/j.jwpe.2024.106586","DOIUrl":"10.1016/j.jwpe.2024.106586","url":null,"abstract":"<div><div>Perfluoroalkyl substances (PFAS), like perfluorooctanoic acid (PFOA), are of concern worldwide given they are ubiquitous in the environment. In this study, the treatment of PFOA-contaminated water was assessed using biochar adsorbents produced from raw canola straw (RCS) through chemical activation with H<sub>3</sub>PO<sub>4</sub> and ZnCl<sub>2</sub> and microwave-assisted pyrolysis (MWP). MWP conditions were evaluated to create optimal H<sub>3</sub>PO<sub>4</sub>-treated (PBC) and ZnCl<sub>2</sub>-treated (ZnBC) biochar adsorbents with treatments determined using a central composite design (CCD) based on the response surface methodology (RSM) considering activator concentration, and microwave heating time and power. The highest PFOA removal efficiency for PBC (3.0 mol/L) was achieved at 92 % (368 μg/g), while for ZnBC (0.55 mol/L) it was 84 % (336 μg/g). In contrast, untreated biochar and RCS had markedly lower PFOA removals of 5 % and 1 %, respectively. Activation of biochar under optimal pyrolysis conditions (6 min at 600 W) led to increased chemical functional groups, porosity, and surface area, as confirmed by FT-IR, XPS, and BET. The kinetic study indicated that chemisorption was the primary PFOA adsorption mechanism, while the Freundlich isotherm model suggested heterogeneous multilayer adsorption for PFOA removal. Further, background salts enhanced PFOA adsorption through divalent bridges and salting-out mechanisms. PBC and ZnBC adsorbents performed well over a broad pH range of 3 to 9. Lastly, Yan and Yoon-Nelson models were used to assess adsorption breakthrough for a model fixed-bed adsorption system. This study exhibits that PBC and ZnBC adsorbents, derived from accessible biomass, offer an environmentally friendly solution to remove PFOA from contaminated water.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106586"},"PeriodicalIF":6.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702418","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}
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