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J Environ Sci Health A Tox Hazard Subst Environ Eng. 2018;53(11):992-999. doi: 10.1080/10934529.2018.1471031. Epub 2018 May 15.

Occurrence of parent and substituted polycyclic aromatic hydrocarbons in typical wastewater treatment plants and effluent receiving rivers of Beijing, and risk assessment.

Author information

1
a Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing , China.
2
b College of Water Sciences, Beijing Normal University , Beijing , China.

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.

KEYWORDS:

Polycyclic aromatic hydrocarbons; biological treatment process; receiving river; risk assessment; source; substituted polycyclic aromatic hydrocarbons

PMID:
29764288
DOI:
10.1080/10934529.2018.1471031
[Indexed for MEDLINE]

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