Abstract
Coupled bioelectrochemical system-upflow anaerobic sludge blanket (BES-UASB) was utilized for wastewater treatment containing 2,4-dichloronitrobenzene (DClNB). The results indicated that a proper voltage enhanced the DClNB reduction, however, over high voltage presented a negative impact (2.0 V). Synergistic effect of external voltage and anaerobic sludge was observed, and dechlorination efficiency reached 57.8 ± 5.4% in the coupled BES, which was higher than the sum of anaerobic sludge and electric system (48.2%). Moreover, the coupled system was more tolerant of high salinity and pollutant concentration. Dehydrogenase activity (DHA) was related to microbial electron transfer activity and DHA reached a maximum 453 ± 33 μgTF g−1VSS h−1 in the coupled reactor which was 1.6-fold that of the control, meanwhile, extracellular polymeric substances (EPS) content was significantly enhanced in the presence of external voltage. In summary, the coupled BES-UASB systems could be an alternative for removal of recalcitrant pollutants such as DClNB.
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Funding
This work was funded by the National Natural Science Foundation of China (Nos. 51678519), Major Science and Technology Program for Water Pollution Control and Treatment (2017ZX07206-002) and the National Natural Science Foundation of China 51378454.
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Chen, H., Lu, D., Chen, L. et al. A study of the coupled bioelectrochemical system-upflow anaerobic sludge blanket for efficient transformation of 2,4-dichloronitrobenzene. Environ Sci Pollut Res 26, 13002–13013 (2019). https://doi.org/10.1007/s11356-019-04751-9
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DOI: https://doi.org/10.1007/s11356-019-04751-9