Anaerobic Bioremediation Performance and Indigenous Microbial Communities in Treatment of Trichloroethylene/Nitrate-Contaminated Groundwater

作者：Dong, Shanshan; Feng, Chuanping^*; Cui, Weihua; Chen, Nan; Liu, Ying; Liu, Tong

来源：Environmental Engineering Science, 2018, 35(4): 311-322.

DOI：10.1089/ees.2017.0124

• activated carbon
• microbial community
• nitrate
• response surface methodology (RSM)
• trichloroethylene

To meet recommended drinking water standards, developing effective methods for eliminating mixed contamination of trichloroethylene (TCE) and nitrate, the two most common groundwater contaminants, is critical. However, many previous studies examined bioremediation performance only for single contaminants. In this study, the performance of indigenous microbial communities on anaerobic removal of TCE/nitrate mixed contamination in groundwater was investigated. Central composite design (CCD) and response surface methodology (RSM) predicted that for bioremoval of 3.87mg/L TCE combined with 50mg/L nitrate-N, the optimal conditions were: pH 8.01, 20.18 degrees C, and a powder activated carbon (PAC) dosage of 4.04% (w/v). Under these conditions, 100% of both TCE and nitrate could be removed with no by-product accumulation after 14 days. Presence of TCE and nitrate did not inhibit bioremoval performance for mixed contaminations, although pH and temperature had a more significant influence on mixed compared to single contaminants. Community structure changed during the bioremoval process, such that the population of dechlorinating bacteria declined while that of denitrification bacteria increased due to the addition of PAC that adsorbed TCE. Results obtained in this study could improve applications for removing TCE/nitrate mixed contamination and understanding of how the composition of microbial communities influences anaerobic bioremediation.

• 出版日期2018-4
• 单位中国地质大学（北京）