Biotoxicity dynamic change and key toxic organics identification of coal chemical wastewater along a novel full-scale treatment process  

作　　者：Weiwei Ma Xiaoqi Zhang Hongjun Han Xueqing Shi Qiaoping Kong Tong Yu Fei Zhao 

机构地区：[1]School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266520,China [2]State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Journal of Environmental Sciences》2024年第4期277-287,共11页环境科学学报（英文版）

基　　金：supported by the Natural Science Foundation of Shandong Province,China(No.ZR2021QE227);the Natural Science Foundation of Shandong Province,China(No.ZR2021QE272);the Open Project of State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(No.ES202120);the Taishan Scholars Program of Shandong Province,China(No.tsqn201812091)。

摘　　要：It is particularly important to comprehensively assess the biotoxicity variation of industrial wastewater along the treatment process for ensuring the water environment security.However,intensive studies on the biotoxicity reduction of industrial wastewater are still limited.In this study,the toxic organics removal and biotoxicity reduction of coal chemical wastewater(CCW)along a novel full-scale treatment process based on the pretreatment process-anaerobic process-biological enhanced(BE)process-anoxic/oxic(A/O)process-advanced treatment process was evaluated.This process performed great removal efficiency of COD,total phenol,NH_(4)^(+)-N and total nitrogen.And the biotoxicity variation along the treatment units was analyzed from the perspective of acute biotoxicity,genotixicity and oxidative damage.The results indicated that the effluent of pretreatment process presented relatively high acute biotoxicity to Tetrahymena thermophila.But the acute biotoxicity was significantly reduced in BE-A/O process.And the genotoxicity and oxidative damage to Tetrahymena thermophila were significantly decreased after advanced treatment.The polar organics in CCW were identified as the main biotoxicity contributors.Phenols were positively correlated with acute biotoxicity,while the nitrogenous heterocyclic compounds and polycyclic aromatic hydrocarbons were positively correlated with genotoxicity.Although the biotoxicity was effectively reduced in the novel full-scale treatment process,the effluent still performed potential biotoxicity,which need to be further explored in order to reduce environmental risk.

关 键 词：Acute biotoxicity GENOTOXICITY Oxidative damage Toxic organics Coal chemical wastewater Novel full-scale treatment process 

分 类 号：X784[环境科学与工程—环境工程]