CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Siqi Zhang,Ziang Kong,Han Wang,Qun Yan,Dimitris V. Vayenas,Guangsheng Zhang
In this study, activated biochar (BC), nano zero-valent iron (nZVI) and biochar supported nano zero-valent iron (BC-nZVI) were used to remove cathodic nitrate in bioelectrochemical system (BES). With an initial NO 3 – -N concentration of 100 mg/L, it was found that the complete nitrate removal could be observed within 28 h for the group of BC-nZVI, whereas the accumulated ammonia reached 63.33 mg/L. Meanwhile, nitrate removal reaction rate constants reached 0.171, 0.110, 0.023 and only 0.010 h −1 for BC-nZVI, nZVI, BC and the Control groups, respectively. Besides, enzymatic activity of nicotinamide adenine dinucleotide (NADH) and nitrous oxide reductase (NOS) of the BC-nZVI group reached the peak faster than three other groups. As a carrier for nZVI, loading of nZVI onto BC could increase the surface area of BC-nZVI other than nZVI for microbial aggregation, while embedded nZVI would contribute to the granulation of sludge and nitrate reduction. Moreover, Cyclic Voltammetry (CV) and chronoamperometry (CA) indicated that BC-nZVI group obtain better electrochemical performances. Importantly, it was found that not only abundances of microbial genus, but relative abundances of those iron mediated enzymes responsible for electro-consuming, hydrogen production and preferential ammonia accumulated nitrate removal could all be enriched. Therefore, BC-nZVI could be implemented to enhance the nitrate removal at biocathode in BES.
研究领域:
环境工程
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电化学
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微生物学
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水处理
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2016
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IF 4.917
Min-Hua Cui,Dan Cui,Lei Gao,Hao-Yi Cheng,Ai-Jie Wang
A continuous stirred tank reactor with built-in bioelectrochemical system (CSTR-BES) was developed for azo dye Alizarin Yellow R (AYR) containing wastewater treatment. The decolorization efficiency (DE) of the CSTR-BES was 97.04 ± 0.06% for 7 h with sludge concentration of 3000 mg/L and initial AYR concentration of 100 mg/L, which was superior to that of the sole CSTR mode (open circuit: 54.87 ± 4.34%) and the sole BES mode (without sludge addition: 91.37 ± 0.44%). The effects of sludge concentration and sodium acetate (NaAc) concentration on azo dye decolorization were investigated. The highest DE of CSTR-BES for 4 h was 87.66 ± 2.93% with sludge concentration of 12,000 mg/L, NaAc concentration of 2000 mg/L and initial AYR concentration of 100 mg/L. The results in this study indicated that CSTR-BES could be a practical strategy for upgrading conventional anaerobic facilities against refractory wastewater treatment.
研究领域:
环境工程
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生物技术
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废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2023
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IF 11.4
Min-Hua Cui,Qian Zhang,John Justo Ambuchi,Lan-Ying Liu,Lei Chen,Shi-Ming Niu,Chao Zhang,Hong-Bo Liu,Chao Tie,Xue-Juan Bi,He Liu,Ai-Jie Wang
In this work, the bioelectrochemical system (BES) is a feasible alternative for successfully degrading typical refractory emerging contaminant triclosan (TCS). A single-chamber BES reactor with an initial TCS concentration of 1 mg/L, an applied voltage of 0.8 V, and a solution buffered with 50 mM PBS degraded 81.4 ± 0.2% of TCS, exhibiting TCS degradation efficiency improvement to 90.6 ± 0.2% with a biocathode formed from a reversed bioanode. Both bioanode and biocathode were able to degrade TCS with comparable efficiencies of 80.8 ± 4.9% and 87.3 ± 0.4%, respectively. Dechlorination and hydrolysis were proposed as the TCS degradation pathway in the cathode chamber, and another hydroxylation pathway was exclusive in the anode chamber. Microbial community structure analysis indicated Propionibacteriaceae was the predominant member in all electrode biofilms, and the exoelectrogen Geobacter was enriched in anode biofilms. This study comprehensively revealed the feasibility of operating BES technology for TCS degradation.
研究领域:
环境工程
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微生物学
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电化学
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污水处理
✓ 已验证
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2023
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IF 11.4
Zhiwen Lin,Jinan Tan,Zhihan Xiong,Zisen Fu,Jing Chen,Tonghui Xie,Jia Zheng,Yongkui Zhang,Panyu Li
The autochthonous microbial community from excess sludge was regulated for enhanced conversion of CO 2 to acetate without exogenic H 2 . It was interesting that the acetate-fed system exhibited a surprising performance to regulate the microbial community for a high acetate yield and selectivity. As a result, some hydrogen-producing bacteria (e.g., Proteiniborus ) and acetogenic bacteria with the ability of CO 2 reduction were enriched by acetate feeding, 2-bromoethanesulfonate (BES) addition and CO 2 stress. When the selected microbial community was applied to convert CO 2 , the accumulation of acetate was positively correlated to the concentration of yeast extract. Finally, the acetate yield reached up to 67.24 mM with a high product selectivity of 84 % in the presence of yeast extract (2 g/L) and sufficient CO 2 in semi-continuous culture for 10 days. This work should help get new insights into the regulation of microbial community for the efficient acetate production from CO 2 .
研究领域:
环境微生物学
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生物技术
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废物管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
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2019
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IF 5.714
Rui Hou,Xiaoshan Luo,Chuangchuang Liu,Lihua Zhou,Junlin Wen,Yong Yuan
Triphenyl phosphate (TPHP) is one of the major organophosphate esters (OPEs) with increasing consumption. Considering its largely distribution and high toxicity in aquatic environment, it is important to explore an efficient treatment for TPHP. This study aimed to investigate the accelerated degradation of TPHP in a three-electrode single chamber bioelectrochemical system (BES). Significant increase of degradation efficiency of TPHP in the BES was observed compared with open circuit and abiotic controls. The one-order degradation rates of TPHP (1.5 mg L −1 ) were increased with elevating sodium acetate concentrations and showed the highest value (0.054 ± 0.010 h −1 ) in 1.0 g L −1 of sodium acetate. This result indicated bacterial metabolism of TPHP was enhanced by the application of micro-electrical field and addition acetate as co-substrates. TPHP could be degraded into diphenyl phosphate (DPHP), hydroxyl triphenyl phosphate (OH-TPHP) and three byproducts. DPHP was the most accumulated degradation product in BES, which accounted more than 35.5% of the initial TPHP. The composition of bacterial community in BES electrode was affected by the acclimation by TPHP, with the most dominant bacteria of Azospirillum , Petrimonas , Pseudomonas and Geobacter at the genera level. Moreover, it was found that the acute toxic effect of TPHP to Vibrio fischeri was largely removed after the treatment, which revealed that BES is a promising technology to remove TPHP threaten in aquatic environment.
研究领域:
环境工程
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生物技术
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微生物学
·
水处理
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）