Chen Zhiqiang, Li Mo, Wen Qinxue
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150090, China.
Chemosphere. 2017 Dec;189:426-434. doi: 10.1016/j.chemosphere.2017.09.092. Epub 2017 Sep 20.
The environmental presence of organic micro-pollutants (OMPs) has posed increasing risks on aquatic organism and human health. The performance of three commonly used advanced wastewater treatment trains, coagulation-sand filter, coagulation-biological aerated filter (BAF) and ozonation-biological activated carbon (BAC), in removing fifteen residual contaminants and bio-toxicity of the effluent from a local municipal wastewater treatment plant (WWTP) were investigated. Relatively high level of OMPs (0.69-14.71 μg/L), genotoxicity (22.64 μg 4-NQO/L) and estrogenic activity (1.4 μg E2/L) were observed from the secondary effluent (SE). Limited OMPs and bio-toxicity reduction was achieved during coagulation with 20 mg/L of polymeric aluminium and sand filter. Ozonation exhibited high advantage in OMPs, genotoxicity and estrogenic activity reduction. More than 80% of removal was achieved for most OMPs after ozonation with normalized dose of 1.25 mg O/mg DOC, and the removal of OMPs was consistent well with the second reaction kinetics constants of OMPs with ozone. Based on Pearson correlation analysis, spectroscopy indicators such as UV and total fluorescence (TF) exhibited a high positive correlation with genotoxicity reduction, while estrogenic activity was related well with OMPs variation. To sum up, spectroscopic indicators showed a high potential to indicate the OMPs and bio-toxicity of SE.
环境中有机微污染物（OMPs）的存在对水生生物和人类健康构成了日益严重的风险。研究了三种常用的深度污水处理工艺，即混凝 - 砂滤、混凝 - 生物曝气滤池（BAF）和臭氧氧化 - 生物活性炭（BAC），对当地城市污水处理厂（WWTP）出水的15种残留污染物的去除效果及生物毒性。二级出水（SE）中观察到相对较高水平的OMPs（0.69 - 14.71μg/L）、遗传毒性（22.64μg 4 - NQO/L）和雌激素活性（1.4μg E2/L）。使用20mg/L聚合氯化铝进行混凝和砂滤过程中，OMPs和生物毒性的降低有限。臭氧氧化在降低OMPs、遗传毒性和雌激素活性方面具有显著优势。在归一化剂量为1.25mg O/mg DOC的臭氧氧化后，大多数OMPs的去除率超过80%，且OMPs的去除与OMPs与臭氧的二级反应动力学常数吻合良好。基于Pearson相关性分析，紫外（UV）和总荧光（TF）等光谱指标与遗传毒性降低呈高度正相关，而雌激素活性与OMPs变化密切相关。综上所述，光谱指标在指示二级出水的OMPs和生物毒性方面具有很大潜力。
