Occurrence of parent and substituted polycyclic aromatic hydrocarbons in typical wastewater treatment plants and effluent receiving rivers of Beijing, and risk assessment. Issue 11 (19th September 2018)

• Record Type: Journal Article
• Authors: Cao, Wei; Qiao, Meng; Liu, Bochuan; Zhao, Xu
• Is Part Of: Journal of environmental science and health. Volume 53:Issue 11(2018)
• Page Start: 992
• Page End: 999
• Publication Date: 2018-09-19
• Subjects: Polycyclic aromatic hydrocarbons -- substituted polycyclic aromatic hydrocarbons -- source -- biological treatment process -- receiving river -- risk assessment; Environmental engineering -- Periodicals; Environmental sciences -- Periodicals; Ecology -- periodicals; Hazardous Substances -- periodicals; 628
• DOI: 10.1080/10934529.2018.1471031
• Languages: English
• ISSNs: 1093-4529

Abstract

ABSTRACT: Sixteen polycyclic aromatic hydrocarbons (PAHs) and some typical substituted polycyclic aromatic hydrocarbons (SPAHs) were investigated in wastewater treatment plants (WWTPs) and effluent effluent-receiving rivers in order to indentify the elimination of these compounds in WWTPs, as well as the potantial potential risk in the effluent-receiving rivers. The concentrations of ΣPAHs in the total phase (combined dissolved and adsorbed phases) in influent were between 944.1 and 1246.5 ng·L −1, and ΣSPAHs, including methyl PAHs (MPAHs) and oxygenated PAHs (OPAHs), between 684.9 and 844.9 ng·L −1 . Regarding the SPAHs, the concentrations of ΣOPAHs (312.3 ng·L −1 ) were higher than those of ΣMPAHs (271.8 ng·L −1 ). The total removal efficiencies of PAHs in the biological treatment processes were between 59% and 68%, and those of SPAHs were a little lower (58–65%). The removal efficiency in the adsorbed phase was higher than in the dissolved phase. The concentrations of PAHs and SPAHs in the effluent were a little higher than in the receiving river. According to a PAH risk assessment of the effluent, 7 carcinogenic PAHs accounted for a relatively high proportion. Benzo[a]pyrene (BaP) and Dibenz[a, h]anthracene (DBA) were major contributors to the TEQs in the effluent of WWTPs, which should be taken into consideration.