Function of a landscape lake in the reduction of biotoxicity related to trace organic chemicals from reclaimed water

JOURNAL OF HAZARDOUS MATERIALS

卷:318

Article

Ma, Xiaoyan Y.^1,2,3,4  Wang, Xiaochang C.^1,2,3,4  Wang, Donghong⁵  Ngo, Huu Hao⁶  Zhang, Qiuya^1,2,3,4  Wang, Yongkun^1,2,3,4  Dai, Dinan^1,2,3,4 

[1] Xian Univ Architecture & Technol, Int Sci & Technol Cooperat Ctr Urban Alternat Wat, Xian 710055, Peoples R China

[2] Xian Univ Architecture & Technol, Key Lab Northwest Water Resource Environm & Ecol, MOE, Xian 710055, Peoples R China

[3] Xian Univ Architecture & Technol, Engn Technol Res Ctr Wastewater Treatment & Reuse, Xian 710055, Peoples R China

[4] Xian Univ Architecture & Technol, Key Lab Environm Engn Shaanxi Prov, Xian 710055, Peoples R China

[5] Chinese Acad Sci, State Key Lab Environm Aquat Chem, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China

[6] Univ Technol Sydney, Sch Civil & Environm Engn, Fac Engn & Informat Technol, Sydney, NSW 2007, Australia

关键词: Biotoxicity;    Trace organic chemicals;    Reclaimed water;    Open storage;    Ecological safety;   

DOI  :  10.1016/j.jhazmat.2016.07.050

来源: Elsevier

【 摘 要 】

The storage of water in a landscape lake can act as a buffer zone between reclaimed water production and reuse, but there is still uncertainty about the variation of water quality and toxic effects during the open-storage process. In this study, long-term sample collection, chemical analyses and biotoxicity assessments were conducted on reclaimed water before and after open storage in a landscape lake. The organic contents, in terms of chemical oxygen demand and total organic carbon, were found to be slightly higher in the lake water than that in the reclaimed water, but substantial reduction of the total concentration of 52 trace organic chemicals was obtained and microorganism toxicity, phytotoxicity, aquatic vertebrate toxicity and genotoxicity, were significantly weakened after open storage. Furthermore, the total risk quotient (RQ(Total) decreased from 5.12 (potential ecological risk level) in the reclaimed water to 0.18 (negligible ecological risk level) in the lake water. The removal of chlorpyrifos, dichiorphos and tetracycline was identified as the main reason for biotoxicity reduction after open storage. The seminatural environment of the landscape lake would have provided a favorable condition for the decay of toxic trace organic chemicals so that the stored water turned to be safer for further reuse. (C) 2016 Published by Elsevier B.V.

【 授权许可】

Free