Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103421
El Mokhtar El Hafidi, Abdelhadi Mortadi, El Ghaouti Chahid, Said Laasri
In this study, we treated domestic wastewater originating from the city of Oulad Frej using a novel treatment technology called percolation infiltration. The filtration medium consisted of a mixture of fly ash and sea sand sourced from the coast of Essaouiria. The filtration process yielded remarkable results, achieving an impressive reduction of 80% in COD, 70% in BOD5, 86% in suspended matter (SM), and 81-99% in heavy metals. Moreover, significant improvements were observed in terms of discoloration and pH reduction. To assess the efficacy of the domestic wastewater treatment technology, we introduced a new key indicator, complex conductivity σ*(ω), and monitored its changes before and after treatment. The impedance spectra analysis showed a strong correlation with the parameters obtained through conventional methods.
{"title":"Monitoring of Domestic Wastewater Treatment via Infiltration Percolation Using Impedance Spectroscopy","authors":"El Mokhtar El Hafidi, Abdelhadi Mortadi, El Ghaouti Chahid, Said Laasri","doi":"10.1016/j.eti.2023.103421","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103421","url":null,"abstract":"In this study, we treated domestic wastewater originating from the city of Oulad Frej using a novel treatment technology called percolation infiltration. The filtration medium consisted of a mixture of fly ash and sea sand sourced from the coast of Essaouiria. The filtration process yielded remarkable results, achieving an impressive reduction of 80% in COD, 70% in BOD5, 86% in suspended matter (SM), and 81-99% in heavy metals. Moreover, significant improvements were observed in terms of discoloration and pH reduction. To assess the efficacy of the domestic wastewater treatment technology, we introduced a new key indicator, complex conductivity σ*(ω), and monitored its changes before and after treatment. The impedance spectra analysis showed a strong correlation with the parameters obtained through conventional methods.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135410530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103390
Peipei Zuo, Hanxu Pu, Qin Zhou, Ting Hu, Shi Zhou, Guoze Wang, Peng Luo
Intestinal and liver damage caused by low arsenic exposure exists in worldwide, but the pathogenic mechanism is not clear at present.Dictyophora is a characteristic edible and medicinal fungus in China, and research has shown that its polysaccharides have good prebiotic effects.Therefore,we explored whether volva polysaccharide from Dictyophora has a certain therapeutic effect and its mechanism on intestinal and hepatic injury caused by low arsenic exposure.Firstly,we constructed the SD rat model of enteritis caused by low arsenic-induced.Then, from the perspectives of inflammatory responses capacity,histological alterations and serum biochemical levels of rats by arsenic-exposed with DIP intervention are analyzes the possible mechanism of intestinal and liver injury.Besides, the caecal microbiomes patterns were analysed using 16 S rDNA amplicon sequencing.Results showed that dictyophora polysaccharide increased the abundance of beneficial bacteria such as Turicibacter, Oscillospiraceae_UCG-005,and reduced the abundance of Desulfovibrionia and Lachnospiraceae_NK4A136_group proinflammatory bacteria.After dictyophora polysaccharide intervention, the pathological changes of liver and colon were alleviated,and the levels of triglyceride, total cholesterol,and lipopolysaccharide in hepatic portal vein, total arsenic contents in the liver and colon tissues were reduced. Finally,we also found after dictyophora polysaccharide intervention,the gene and protein expression of Toll-like receptor 4 was returned to normal level,and the expression levels of pro-inflammatory factors in liver and colon were reduce. In summary, our study found that dictyophora polysaccharide alleviated intestinal and hepatic injury in rats exposed to low arsenic by regulated intestinal microbiota and reduced TLR4 activation, which inhibited downstream proteins MyD88 to reduce the nuclear translocation of the NF-κB p65 genes and protein.
{"title":"Dictyophora polysaccharides alleviate intestinal-hepatic injury exposed to low-arsenic by regulating the imbalance of gut microbiota and LPS/TLR4 pathway in rats","authors":"Peipei Zuo, Hanxu Pu, Qin Zhou, Ting Hu, Shi Zhou, Guoze Wang, Peng Luo","doi":"10.1016/j.eti.2023.103390","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103390","url":null,"abstract":"Intestinal and liver damage caused by low arsenic exposure exists in worldwide, but the pathogenic mechanism is not clear at present.Dictyophora is a characteristic edible and medicinal fungus in China, and research has shown that its polysaccharides have good prebiotic effects.Therefore,we explored whether volva polysaccharide from Dictyophora has a certain therapeutic effect and its mechanism on intestinal and hepatic injury caused by low arsenic exposure.Firstly,we constructed the SD rat model of enteritis caused by low arsenic-induced.Then, from the perspectives of inflammatory responses capacity,histological alterations and serum biochemical levels of rats by arsenic-exposed with DIP intervention are analyzes the possible mechanism of intestinal and liver injury.Besides, the caecal microbiomes patterns were analysed using 16 S rDNA amplicon sequencing.Results showed that dictyophora polysaccharide increased the abundance of beneficial bacteria such as Turicibacter, Oscillospiraceae_UCG-005,and reduced the abundance of Desulfovibrionia and Lachnospiraceae_NK4A136_group proinflammatory bacteria.After dictyophora polysaccharide intervention, the pathological changes of liver and colon were alleviated,and the levels of triglyceride, total cholesterol,and lipopolysaccharide in hepatic portal vein, total arsenic contents in the liver and colon tissues were reduced. Finally,we also found after dictyophora polysaccharide intervention,the gene and protein expression of Toll-like receptor 4 was returned to normal level,and the expression levels of pro-inflammatory factors in liver and colon were reduce. In summary, our study found that dictyophora polysaccharide alleviated intestinal and hepatic injury in rats exposed to low arsenic by regulated intestinal microbiota and reduced TLR4 activation, which inhibited downstream proteins MyD88 to reduce the nuclear translocation of the NF-κB p65 genes and protein.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136102750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103362
Siqi Huang, Zhenzhen Cao, Meiyan Guan, Mingxue Chen, Xiaoyan Lin
Quinclorac (QNC) is a highly selective herbicide with hormone-like properties and low toxicity, primarily employed to control barnyard grass in paddy fields. Owing to its extended half-life, it readily accumulates in soil, thereby inhibiting the growth and development of subsequent crops. Additionally, long-term residual accumulation of QNC has notable repercussions on soil microbial communities. Certain bacteria capable of degrading QNC have been identified, effectively diminishing its soil residues and thus mitigating its ecological impact. For the first time, high-throughput sequencing technology (Illumina MiSeq) was employed to assess the influence of both QNC and the newly isolated QNC-degrading bacterial strain D on soil microorganisms in contaminated paddy fields. The study yielded significant findings: substantial variances were observed in the composition and structural diversity of microbial communities across various treatments. Furthermore, strain D demonstrated a restorative effect on microbial community composition and structural diversity. QNC was found to suppress specific functions within soil bacteria and fungi, altering the constitution of functional groups. Interestingly, strain D counteracted the suppressive effect of QNC, contributing positively to the restoration of soil microbial ecology. Consequently, this research offers a novel strain resource and a theoretical foundation for microbiologically mitigating QNC contamination in paddy fields.
{"title":"Assessing the ecological impact and microbial restoration of quinclorac-contaminated paddy fields through high-throughput sequencing technology","authors":"Siqi Huang, Zhenzhen Cao, Meiyan Guan, Mingxue Chen, Xiaoyan Lin","doi":"10.1016/j.eti.2023.103362","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103362","url":null,"abstract":"Quinclorac (QNC) is a highly selective herbicide with hormone-like properties and low toxicity, primarily employed to control barnyard grass in paddy fields. Owing to its extended half-life, it readily accumulates in soil, thereby inhibiting the growth and development of subsequent crops. Additionally, long-term residual accumulation of QNC has notable repercussions on soil microbial communities. Certain bacteria capable of degrading QNC have been identified, effectively diminishing its soil residues and thus mitigating its ecological impact. For the first time, high-throughput sequencing technology (Illumina MiSeq) was employed to assess the influence of both QNC and the newly isolated QNC-degrading bacterial strain D on soil microorganisms in contaminated paddy fields. The study yielded significant findings: substantial variances were observed in the composition and structural diversity of microbial communities across various treatments. Furthermore, strain D demonstrated a restorative effect on microbial community composition and structural diversity. QNC was found to suppress specific functions within soil bacteria and fungi, altering the constitution of functional groups. Interestingly, strain D counteracted the suppressive effect of QNC, contributing positively to the restoration of soil microbial ecology. Consequently, this research offers a novel strain resource and a theoretical foundation for microbiologically mitigating QNC contamination in paddy fields.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134902847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103431
Yuchuan Fan, Jie Zhuang, Michael Essington, Xi Zhang, Guanghui Hua, Jehangir Bhadha, Shaopan Xia, Xuanyu Lu, Jaehoon Lee
Denitrifying bioreactors (DNBRs) are a sustainable and cost-effective practice commonly used at the edge of fields to reduce nitrate from agricultural runoff. The hydraulic retention time (HRT) is a crucial variable that affects nitrate removal rate (NRR, g N m-3 d-1), nitrate removal efficiency (NRE, %), and nitrate concentration reduction per length (Nrd, mg N L-1 m-1). In this study, two nonlinear models, the developed Michaelis-Menten (MM) model and the Mitscherlich (MT) model, were developed to characterize the relationship between nitrate removal indices (NRR, NRE, and Nrd) and HRT. This study first utilizes nonlinear models to quantitatively understand the relationship between NRR, NRE, Nrd, and HRT. To verify the models, eight experiments were conducted under different conditions, including different scales (laboratory and field), media (woodchip, woodchip+biochar, woodchip+silage leachate, woodchip+biochar+silage leachate), and influent nitrate concentrations (6.8-70 mg N L-1). The results showed that the MT model outperformed the MM model and MT could accurately characterize the nitrate removal changes with HRT and provide the optimal HRT (HRTO). Overall, the model could be beneficial for designers and practitioners to optimize nitrate removal.
反硝化生物反应器(dnbr)是一种可持续的、具有成本效益的做法，通常用于农田边缘，以减少农业径流中的硝酸盐。水力停留时间(HRT)是影响硝酸盐去除率(NRR, g N m-3 d-1)、硝酸盐去除率(NRE， %)和每长度硝酸盐还原浓度(Nrd, mg N L-1 m-1)的关键变量。本文建立了两种非线性模型，分别为Michaelis-Menten (MM)模型和Mitscherlich (MT)模型，用于表征硝酸盐去除指标(NRR、NRE和Nrd)与HRT之间的关系。本研究首先利用非线性模型定量理解了NRR、NRE、Nrd和HRT之间的关系。为了验证模型，在不同规模(实验室和现场)、不同介质(木片、木片+生物炭、木片+青贮渗滤液、木片+生物炭+青贮渗滤液)和进水硝酸盐浓度(6.8 ~ 70 mg N L-1)下进行了8项实验。结果表明，MT模型优于MM模型，MT能准确表征HRT对硝酸盐去除的影响，并提供最佳HRT (HRTO)。综上所述，该模型可为设计师和实践者优化硝酸盐去除提供参考。
{"title":"Characterizing the role of hydraulic retention time on nitrate removal indices in denitrifying bioreactors by nonlinear models","authors":"Yuchuan Fan, Jie Zhuang, Michael Essington, Xi Zhang, Guanghui Hua, Jehangir Bhadha, Shaopan Xia, Xuanyu Lu, Jaehoon Lee","doi":"10.1016/j.eti.2023.103431","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103431","url":null,"abstract":"Denitrifying bioreactors (DNBRs) are a sustainable and cost-effective practice commonly used at the edge of fields to reduce nitrate from agricultural runoff. The hydraulic retention time (HRT) is a crucial variable that affects nitrate removal rate (NRR, g N m-3 d-1), nitrate removal efficiency (NRE, %), and nitrate concentration reduction per length (Nrd, mg N L-1 m-1). In this study, two nonlinear models, the developed Michaelis-Menten (MM) model and the Mitscherlich (MT) model, were developed to characterize the relationship between nitrate removal indices (NRR, NRE, and Nrd) and HRT. This study first utilizes nonlinear models to quantitatively understand the relationship between NRR, NRE, Nrd, and HRT. To verify the models, eight experiments were conducted under different conditions, including different scales (laboratory and field), media (woodchip, woodchip+biochar, woodchip+silage leachate, woodchip+biochar+silage leachate), and influent nitrate concentrations (6.8-70 mg N L-1). The results showed that the MT model outperformed the MM model and MT could accurately characterize the nitrate removal changes with HRT and provide the optimal HRT (HRTO). Overall, the model could be beneficial for designers and practitioners to optimize nitrate removal.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135410829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Water pollution is a pressing concern in China as well as in other countries around the world. Despite escalating the water quality issues associated with the water sources of Xuzhou, Jiangsu Province, China—namely Weishan and Luoma Lakes—a dearth of scientific and systematic guidance regarding water environmental management remains. This study investigated the water quality and potential pollution sources of Weishan and Luoma Lakes through hydrochemical analysis, correlation analysis (CA), principal component analysis (PCA), as well as analyses of the Water Quality Index (WQI) and pollution evaluation index (PEI). Results showed that the average values of some components, such as turbidity, total dissolved solids (TDS), total nitrogen (TN), total hardness (TH), and alkalinity (ALK), were higher than the standard limits. The CA results revealed heterogeneity in the sources and pathways of the pollutants and ions. PCA was used to identify five key water quality indicators for Weishan and Luoma Lakes, explaining a cumulative variance of 85.26–86.64% and 83.56–85.64%, respectively. In Weishan Lake, anthropogenic and industrial sources were the primary contributors to water pollution, whereas in Luoma Lake, anthropogenic and natural sources were the primary pollution source, followed by agricultural sources. In general, the WQI and PEI values indicated that the water quality in Weishan Lake and Luoma Lake was classified as “good” during the study period, despite the deterioration of water quality in both lakes. Overall, implementing a robust management plan for maintaining the aquatic environment in these two lake areas is necessary.
{"title":"Water quality assessment and pollution evaluation of surface water sources：The case of Weishan and Luoma Lakes, Xuzhou, Jiangsu Province, China","authors":"Jingbang Wang, Weiqing Zhou, Minglei Zhao, Xiaoming Guo","doi":"10.1016/j.eti.2023.103397","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103397","url":null,"abstract":"Water pollution is a pressing concern in China as well as in other countries around the world. Despite escalating the water quality issues associated with the water sources of Xuzhou, Jiangsu Province, China—namely Weishan and Luoma Lakes—a dearth of scientific and systematic guidance regarding water environmental management remains. This study investigated the water quality and potential pollution sources of Weishan and Luoma Lakes through hydrochemical analysis, correlation analysis (CA), principal component analysis (PCA), as well as analyses of the Water Quality Index (WQI) and pollution evaluation index (PEI). Results showed that the average values of some components, such as turbidity, total dissolved solids (TDS), total nitrogen (TN), total hardness (TH), and alkalinity (ALK), were higher than the standard limits. The CA results revealed heterogeneity in the sources and pathways of the pollutants and ions. PCA was used to identify five key water quality indicators for Weishan and Luoma Lakes, explaining a cumulative variance of 85.26–86.64% and 83.56–85.64%, respectively. In Weishan Lake, anthropogenic and industrial sources were the primary contributors to water pollution, whereas in Luoma Lake, anthropogenic and natural sources were the primary pollution source, followed by agricultural sources. In general, the WQI and PEI values indicated that the water quality in Weishan Lake and Luoma Lake was classified as “good” during the study period, despite the deterioration of water quality in both lakes. Overall, implementing a robust management plan for maintaining the aquatic environment in these two lake areas is necessary.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135062228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103414
Syazwani Mohd Asharuddin, Norzila Othman, Qais Ali Ahmed Mohammed Al-Maqtari, Wahid Ali Hamood Al-towayti, Siti Nor Hidayah Arifin
The current study describes the synergistic action of a green starch flocculant extracted from agricultural waste coupled with aluminium sulphate to enhance coagulation and flocculation for surface water treatment. The coagulants and the flocs characteristics were analyzed to better understand the physicochemical properties and the underlying mechanisms of the treatment process. Several elements, including Cl and Ca were observed on the surface of the starch, and the presence of essential functional groups such as hydroxyl and carboxyl that help to promote flocculation function was detected. Superior performance was observed in the treatment using alum+TPS compared to the treatment using alum as a sole coagulant. Maximum turbidity and TSS removals of 90.32% and 88.89%, respectively, were attained within 10 minutes of settling time using the recommended alum-TPS dosage of 7.5-50 mg/L at pH 7. The flocs generated by the alum+TPS treatment exhibited distinguishable characteristics with bigger and highly compacted flocs matrix in which colloidal particles enmeshed within the flocs clusters. The combination use of alum+TPS showed the microflocs were initially formed by alum through the charge neutralization mechanism. The later addition of the starch into the suspension revealed that the bridging and sweep flocculation mechanism governs the flocculation process reflected through the shifting of FTIR bands that marked the formation of hydrogen bonding between the starch, alum and the suspended particles. Adding starch into the suspension undoubtedly provided effective entrapment and adsorption by larger-sized polymer, which promotes inter-colloidal particle bridging and subsequently improves the water clarity.
{"title":"The assessment of coagulation and flocculation performance and interpretation of mechanistic behavior of suspended particles aggregation by alum assisted by tapioca peel starch","authors":"Syazwani Mohd Asharuddin, Norzila Othman, Qais Ali Ahmed Mohammed Al-Maqtari, Wahid Ali Hamood Al-towayti, Siti Nor Hidayah Arifin","doi":"10.1016/j.eti.2023.103414","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103414","url":null,"abstract":"The current study describes the synergistic action of a green starch flocculant extracted from agricultural waste coupled with aluminium sulphate to enhance coagulation and flocculation for surface water treatment. The coagulants and the flocs characteristics were analyzed to better understand the physicochemical properties and the underlying mechanisms of the treatment process. Several elements, including Cl and Ca were observed on the surface of the starch, and the presence of essential functional groups such as hydroxyl and carboxyl that help to promote flocculation function was detected. Superior performance was observed in the treatment using alum+TPS compared to the treatment using alum as a sole coagulant. Maximum turbidity and TSS removals of 90.32% and 88.89%, respectively, were attained within 10 minutes of settling time using the recommended alum-TPS dosage of 7.5-50 mg/L at pH 7. The flocs generated by the alum+TPS treatment exhibited distinguishable characteristics with bigger and highly compacted flocs matrix in which colloidal particles enmeshed within the flocs clusters. The combination use of alum+TPS showed the microflocs were initially formed by alum through the charge neutralization mechanism. The later addition of the starch into the suspension revealed that the bridging and sweep flocculation mechanism governs the flocculation process reflected through the shifting of FTIR bands that marked the formation of hydrogen bonding between the starch, alum and the suspended particles. Adding starch into the suspension undoubtedly provided effective entrapment and adsorption by larger-sized polymer, which promotes inter-colloidal particle bridging and subsequently improves the water clarity.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103418
Shan Hu, Huanhuan Fu, Jingyi Fu
Fe3+, a particularly prevalent ion in acid mine drainage (AMD), has a substantial impact on the crystallization of iron-bearing minerals and the immobilization of multiple co-existing oxyanions such as Cr(VI) and As(V). To investigate the varied effects of Fe3+ on Cr(VI) and As(V), ferrihydrite (Fh) and nano-TiO2 were selected due to their superior adsorption effectiveness and distinctive stability. As a result of the dissolution of Fe3+ in Fh and its subsequent promotion to As(V) adsorption, As(V) adsorption capacity on Fh (124.0 mg/g) was twice that of TiO2 (62.76 mg/g). The co-existence of Fe3+ in the As(V) adsorption system greatly enhanced As(V) sorption on TiO2 (18.9–56.5%) and Fh (1.03–15.7%), and an additional Fe-As complex was confirmed to contribute extra As(V) removal on both Fh and TiO2 by the FTIR and EXAFS spectra. On the other hand, TiO2 (18.15 mg/g) and Fh (19.50 mg/g) exhibited nearly identical Cr(VI) adsorption capabilities, and the co-presence of Fe3+ even slightly blocked Cr(VI) sorption on Fh. The spectroscopic and modeling results showed that the monodentate Cr(VI) adsorption complex was blocked by Fe3+, but the outer-sphere and bidentate inner-sphere Cr(VI) surface complexes were unaffected. Additionally, in the ternary As-Cr-Fe adsorbate systems, Cr(VI) had little effect on the development of As-Fe surface complexes or precipitates. With the interference mechanisms, actual AMD wastewater adsorption on Fh and TiO2 was well explained and predicted. The findings would offer fresh perspectives on the bioavailability and fate of hazardous metal compounds in the AMD-polluted locations.
{"title":"0Distinct Effects of Fe3+ on the Adsorption of Chromate and Arsenate: A Comparison of Iron-Bearing Ferrihydrite and Nano-TiO2 Absorbents","authors":"Shan Hu, Huanhuan Fu, Jingyi Fu","doi":"10.1016/j.eti.2023.103418","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103418","url":null,"abstract":"Fe3+, a particularly prevalent ion in acid mine drainage (AMD), has a substantial impact on the crystallization of iron-bearing minerals and the immobilization of multiple co-existing oxyanions such as Cr(VI) and As(V). To investigate the varied effects of Fe3+ on Cr(VI) and As(V), ferrihydrite (Fh) and nano-TiO2 were selected due to their superior adsorption effectiveness and distinctive stability. As a result of the dissolution of Fe3+ in Fh and its subsequent promotion to As(V) adsorption, As(V) adsorption capacity on Fh (124.0 mg/g) was twice that of TiO2 (62.76 mg/g). The co-existence of Fe3+ in the As(V) adsorption system greatly enhanced As(V) sorption on TiO2 (18.9–56.5%) and Fh (1.03–15.7%), and an additional Fe-As complex was confirmed to contribute extra As(V) removal on both Fh and TiO2 by the FTIR and EXAFS spectra. On the other hand, TiO2 (18.15 mg/g) and Fh (19.50 mg/g) exhibited nearly identical Cr(VI) adsorption capabilities, and the co-presence of Fe3+ even slightly blocked Cr(VI) sorption on Fh. The spectroscopic and modeling results showed that the monodentate Cr(VI) adsorption complex was blocked by Fe3+, but the outer-sphere and bidentate inner-sphere Cr(VI) surface complexes were unaffected. Additionally, in the ternary As-Cr-Fe adsorbate systems, Cr(VI) had little effect on the development of As-Fe surface complexes or precipitates. With the interference mechanisms, actual AMD wastewater adsorption on Fh and TiO2 was well explained and predicted. The findings would offer fresh perspectives on the bioavailability and fate of hazardous metal compounds in the AMD-polluted locations.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As(V) is becoming one of the dangerous and toxic chemicals causing the global issue of water pollution. Among several synthesis processes of adsorbent, biomineralization method has shown good potential. This study presented the biologically-induced synthetic Manganese Carbonate Precipitate (BISMCP) through biologically-induced mineralization method and formation change of BISMCP material after calcination process which is becoming MDSMCP. Herein, the potential ability of BISMCP and MDSMCP was performed for removal of As(V) in an aqueous solution. Characterization results showed both materials were successfully synthesized by the biomineralization process. TGA analysis showed the phase transition from MnCO3 to MnO2 significantly at 200-450 ºC. The BET surface area of the as-prepared nanocomposites was found to be 109.006 m2/g (BISMCP) and 91.672 m2/g (MDS-300). EDX analysis showed the elements in the crystal BISMCP and MDSMCP were Mn, C, and O. XRD result of BISMCP and MDSMCP determined the crystal structure, which are close to rhodochrosite (MnCO3) and pyrolusite (MnO2), respectively. Effects of pH, contact time, and varying pollutant concentration were studied in detail. The pHPZC value of BISMCP and MDS-300 was 5.5 and 1.50, respectively. According effect of pH, BISMCP and MDS-300 had better adsorption capacity at pH 6 and 2, respectively. The kinetic study for BISMCP and MDS-300 indicated that well fitted with pseudo-second-order (PSO). The experimental equilibrium data followed the Langmuir isotherm model with a maximum monolayer adsorption capacity of 119.331 mg/g (BISMCP) and 112.107 mg/g (MDS-300). This study implies that BISMCP and MDS-300 are potentially useful adsorbents for the adsorption of As(V).
{"title":"Newly-Development of Synthetic MnCO3 and MnO2 Precipitate Through Biologically-Induced Mineralization for Effective Adsorption of As(V) in Aqueous Solution","authors":"Anggraeni Kumala Dewi, Raju Kumar Sharma, Koyeli Das, Uttara Sukul, Pin-Yun Lin, Yi-Hsun Huang, Chung Ming Lu, Chien-Yen Chen","doi":"10.1016/j.eti.2023.103374","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103374","url":null,"abstract":"As(V) is becoming one of the dangerous and toxic chemicals causing the global issue of water pollution. Among several synthesis processes of adsorbent, biomineralization method has shown good potential. This study presented the biologically-induced synthetic Manganese Carbonate Precipitate (BISMCP) through biologically-induced mineralization method and formation change of BISMCP material after calcination process which is becoming MDSMCP. Herein, the potential ability of BISMCP and MDSMCP was performed for removal of As(V) in an aqueous solution. Characterization results showed both materials were successfully synthesized by the biomineralization process. TGA analysis showed the phase transition from MnCO3 to MnO2 significantly at 200-450 ºC. The BET surface area of the as-prepared nanocomposites was found to be 109.006 m2/g (BISMCP) and 91.672 m2/g (MDS-300). EDX analysis showed the elements in the crystal BISMCP and MDSMCP were Mn, C, and O. XRD result of BISMCP and MDSMCP determined the crystal structure, which are close to rhodochrosite (MnCO3) and pyrolusite (MnO2), respectively. Effects of pH, contact time, and varying pollutant concentration were studied in detail. The pHPZC value of BISMCP and MDS-300 was 5.5 and 1.50, respectively. According effect of pH, BISMCP and MDS-300 had better adsorption capacity at pH 6 and 2, respectively. The kinetic study for BISMCP and MDS-300 indicated that well fitted with pseudo-second-order (PSO). The experimental equilibrium data followed the Langmuir isotherm model with a maximum monolayer adsorption capacity of 119.331 mg/g (BISMCP) and 112.107 mg/g (MDS-300). This study implies that BISMCP and MDS-300 are potentially useful adsorbents for the adsorption of As(V).","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135011748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103376
Yufeng Du, Zhigang Yang, Linxu Xu, Xue Shen, Mingrui Shao, Feiyong Chen, Jin Wang
Red mud is a polluting waste product emitted from the aluminum production industry, which is a potential threat to the environment due to its high yield, strong alkalinity and complex elemental composition. The resource utilization of red mud has also attracted the attention of many researchers. In this study, red mud, straw and bentonite were used as raw materials to prepare granular porous zero valent iron (ZVI) adsorption reaction materials (Fe/GSBR) by carbothermal reduction. Straw was used as pore-forming and reducing agent, bentonite as binder, and red mud as substrate and iron source. The effects of preparation conditions on Fe/GSBR properties were investigated, including raw material ratio, sintering temperature, sintering time and straw particle size. The preparation conditions were optimized by response surface analysis, and the best preparation conditions were determined as follows: raw material ratio was 1:2, sintering temperature was 906℃, sintering time was 60 min, straw particle size was 100 mesh. The Fe/GSBR properties were characterized by SEM, EDS, XRD, and BET to demonstrate the porous and ZVI material. In addition, the regeneration properties and toxic leaching of the materials were evaluated to ensure the environmental safety during use.
{"title":"Preparation and optimization of low-cost red mud based zero-valent iron porous adsorbent by carbothermal reduction and Box-Behnken response method","authors":"Yufeng Du, Zhigang Yang, Linxu Xu, Xue Shen, Mingrui Shao, Feiyong Chen, Jin Wang","doi":"10.1016/j.eti.2023.103376","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103376","url":null,"abstract":"Red mud is a polluting waste product emitted from the aluminum production industry, which is a potential threat to the environment due to its high yield, strong alkalinity and complex elemental composition. The resource utilization of red mud has also attracted the attention of many researchers. In this study, red mud, straw and bentonite were used as raw materials to prepare granular porous zero valent iron (ZVI) adsorption reaction materials (Fe/GSBR) by carbothermal reduction. Straw was used as pore-forming and reducing agent, bentonite as binder, and red mud as substrate and iron source. The effects of preparation conditions on Fe/GSBR properties were investigated, including raw material ratio, sintering temperature, sintering time and straw particle size. The preparation conditions were optimized by response surface analysis, and the best preparation conditions were determined as follows: raw material ratio was 1:2, sintering temperature was 906℃, sintering time was 60 min, straw particle size was 100 mesh. The Fe/GSBR properties were characterized by SEM, EDS, XRD, and BET to demonstrate the porous and ZVI material. In addition, the regeneration properties and toxic leaching of the materials were evaluated to ensure the environmental safety during use.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136371503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.eti.2023.103410
Delal E. Al Momani, Fathima Arshad, Linda Zou
Nanocomposite membranes were fabricated by incorporating MoS2 and GO nanomaterials in the chitosan polymer matrix. The higher polymer to nanomaterial ratio resulted in more porous CMG2 membrane than CMG1 membrane. In comparison of the membranes’ performance, the control membrane without nanomaterials only had minimal removal of organic matter, whereas both nanocomposite membranes achieved 95-100% color removal. CMG2 also achieved 100% TOC removals of MO solutions whereas the TOC removal by CMG1 was less complete. The MoS2 nanoparticles induced catalytic effect to degradate organic matter. The GO nanosheets also introduced a more substantial negative charge to enhance the separation and rejection of organic contaminants. In addition, a faster treatment kinetics per filtration cycle was also displayed by CMG2 than that of CMG1. This was due to its higher posoristy facilitated better access to the MoS2 nanomaterials, for the dye molecules interacting with catalytic sites. Chitosan/MoS2/GO membrane could be a promising membrane-based solution for efficient catalytic degradation of organic contaminants in water and wastewater treatment.
{"title":"Chitosan/MoS2/GO membrane for catalytic degradation of organic contaminants","authors":"Delal E. Al Momani, Fathima Arshad, Linda Zou","doi":"10.1016/j.eti.2023.103410","DOIUrl":"https://doi.org/10.1016/j.eti.2023.103410","url":null,"abstract":"Nanocomposite membranes were fabricated by incorporating MoS2 and GO nanomaterials in the chitosan polymer matrix. The higher polymer to nanomaterial ratio resulted in more porous CMG2 membrane than CMG1 membrane. In comparison of the membranes’ performance, the control membrane without nanomaterials only had minimal removal of organic matter, whereas both nanocomposite membranes achieved 95-100% color removal. CMG2 also achieved 100% TOC removals of MO solutions whereas the TOC removal by CMG1 was less complete. The MoS2 nanoparticles induced catalytic effect to degradate organic matter. The GO nanosheets also introduced a more substantial negative charge to enhance the separation and rejection of organic contaminants. In addition, a faster treatment kinetics per filtration cycle was also displayed by CMG2 than that of CMG1. This was due to its higher posoristy facilitated better access to the MoS2 nanomaterials, for the dye molecules interacting with catalytic sites. Chitosan/MoS2/GO membrane could be a promising membrane-based solution for efficient catalytic degradation of organic contaminants in water and wastewater treatment.","PeriodicalId":11899,"journal":{"name":"Environmental Technology and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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