College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
School of Environment, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2019 Oct;289:121618. doi: 10.1016/j.biortech.2019.121618. Epub 2019 Jun 7.
Constructed wetland (CW) is an efficient technology to treat urban storm water runoff. However, the CW has limited capacity to degrade atrazine, a frequently detected herbicide in runoff. Bioaugmentation provides a feasible enhanced alternative; nevertheless, incorporating bioaugmentation into CW is likely to perpetuate the environmental consequences and incur complex trade-offs between environmental improvement and burdens. Since few efforts were made to improve above situation, the present work proposed the application of bioaugmentation, and tested the feasibility from both efficiency and sustainability dimensions. Results showed that bioaugmentation markedly enhanced atrazine degradation from 5 mg/L to below the threshold value within 43 day by increasing functional atrazine-degrading bacteria. Pseudomonas and Arthrobacter significantly proliferated among atrazine-degrading bacterial genera, indicating high adaptability and atrazine-degrading contribution. With life cycle assessment, enhancing 1 kg of atrazine degradation could decrease environmental burdens with 27.60 kg 1,4-DCB-Eq of freshwater-ecotoxicity reduction, and achieve shorter payback period compared to non-bioaugmented CW.
人工湿地 (CW) 是处理城市雨水径流的有效技术。然而，CW 对在径流中经常检测到的除草剂莠去津的降解能力有限。生物强化提供了一种可行的增强替代方案；然而，将生物强化纳入 CW 可能会延续环境后果，并在环境改善和负担之间产生复杂的权衡。由于很少有努力来改善上述情况，本工作提出了生物强化的应用，并从效率和可持续性两个方面测试了其可行性。结果表明，生物强化通过增加功能莠去津降解菌，可将 5mg/L 莠去津在 43 天内显著降解至阈值以下。假单胞菌和节杆菌在莠去津降解菌属中显著增殖，表明其具有较高的适应性和莠去津降解贡献。通过生命周期评估，强化 1kg 莠去津的降解可以减少 27.60kg1,4-DCB-Eq 的淡水生态毒性，与非生物强化 CW 相比，实现更短的投资回报期。
