Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China.
Bioresour Technol. 2017 Oct;241:879-886. doi: 10.1016/j.biortech.2017.06.010. Epub 2017 Jun 15.
In this study, bioelectrochemical-upflow anaerobic sludge blanket (BES-UASB) system was developed for treatment of 2,4-dichloronitrobenzen (DClNB) containing wastewater to investigate the effect of external voltage with different supplying modes. Results showed that 2,4-dichloroaniline (DClAN) was under detection limit in R1 (applied with intermittent voltage) and R2 (applied with continuous voltage) when the DClNB loading increased from 25 to 100gmd (hydraulic retention time (HRT) was decreased from 24 to 6h) while sudden accumulation of DClAN (1.7mgL) was observed in R0 (control). Dechlorination efficiency (DE) decreased to 32.7%, 45.0% and 45.3% in R0, R1 and R2 when HRT was further shortened to 4h. Microbial community analysis indicated the significant enrichment of dechlorination-related species in R1 and R2 compared with R0, e.g., Dehalobacter and Dehalococcoides. In summary, the BES-UASB system with intermittent voltage is an alternative process for efficient treatment of DClNB containing wastewater, and the energy input was reduced markedly.
在这项研究中，开发了一种生物电化学上流式厌氧污泥床（BES-UASB）系统，用于处理含 2,4-二氯硝基苯（DClNB）的废水，以研究不同供电模式下外加电压的影响。结果表明，当 DClNB 负荷从 25g/md 增加到 100g/md（水力停留时间（HRT）从 24h 缩短至 6h）时，R1（施加间歇电压）和 R2（施加连续电压）中的 2,4-二氯苯胺（DClAN）检测不出，而在 R0（对照）中突然积累了 1.7mg/L 的 DClAN。当 HRT 进一步缩短至 4h 时，R0、R1 和 R2 的脱氯效率（DE）分别降至 32.7%、45.0%和 45.3%。微生物群落分析表明，与 R0 相比，R1 和 R2 中富集了更多的脱氯相关物种，如脱硫弧菌和脱硫球菌。总之，带有间歇电压的 BES-UASB 系统是一种处理含 DClNB 废水的有效替代工艺，且能源投入显著减少。
