Zhu Jia-di, Li Fei-Fei, Chen Lü-Jun
School of Environment, Tsinghua University, Beijing 100084, China.
Zhejiang Provincial Key Laboratory of Water Science and Technology, Yangtze Delta Region Institute of Tsinghua University, Jiaxing 314006, China.
Huan Jing Ke Xue. 2017 Oct 8;38(10):4293-4301. doi: 10.13227/j.hjkx.201703186.
Coking wastewater contains high-strength refractory organic pollutants and is commonly treated by biological treatment processes. To improve the efficiency of biological treatment, two laboratory scale processes, anaerobic membrane bioreactor/anoxic/aerobic membrane bioreactor (AnMBR-A-MBR) and anaerobic/anoxic/aerobic membrane bioreactor (A-MBR), were developed for coking wastewater treatment. The removal of main pollutants and the stability of different pollutant loadings were compared under the optimum operating conditions. Acute toxicity distribution, variations, and toxic matter characteristics of the two processes were investigated by solid-phase extraction, components separation, the luminous bacteria Q67 test, and three-dimensional fluorescence spectrometry. The results showed that the organic pollutant removal rate of AnMBR was 15.3%, which was significantly higher than the anaerobic stage of the A-MBR system (3.4%), and the AnMBR-A-MBR system had greater resistance to pollutant loading. Acute toxicity of AnMBR-A-MBR system in each stage effluent was lower than the A-MBR system and the total toxic unit removal rate of both were 85.2% and 79.2%, respectively. The acute toxicity of the polar component in each stage effluent was the highest, and the polar and mid-polar components contributed to the majority of the toxicity. The toxicity of each stage effluent mainly originated from Region Ⅱ aromatic protein analogues, which could be the main acute toxicity substances of the polar component.
焦化废水含有高强度难降解有机污染物，通常采用生物处理工艺进行处理。为提高生物处理效率，开发了两种实验室规模的工艺，即厌氧膜生物反应器/缺氧/好氧膜生物反应器（AnMBR-A-MBR）和厌氧/缺氧/好氧膜生物反应器（A-MBR）用于焦化废水处理。在最佳运行条件下，比较了主要污染物的去除情况以及不同污染物负荷下的稳定性。通过固相萃取、成分分离、发光细菌Q67测试和三维荧光光谱法研究了这两种工艺的急性毒性分布、变化及有毒物质特性。结果表明，AnMBR的有机污染物去除率为15.3%，显著高于A-MBR系统的厌氧阶段（3.4%），且AnMBR-A-MBR系统对污染物负荷具有更强的抗性。AnMBR-A-MBR系统各阶段出水的急性毒性均低于A-MBR系统，两者的总毒性单位去除率分别为85.2%和79.2%。各阶段出水极性组分的急性毒性最高，极性和中极性组分占毒性的大部分。各阶段出水的毒性主要源于区域Ⅱ芳香族蛋白质类似物，其可能是极性组分的主要急性毒性物质。
