当前位置: X-MOL 学术Sci. Total Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Occurrence, fates, and carcinogenic risks of substituted polycyclic aromatic hydrocarbons in two coking wastewater treatment systems
Science of the Total Environment ( IF 9.8 ) Pub Date : 2021-05-17 , DOI: 10.1016/j.scitotenv.2021.147808
Ayman N Saber 1 , Haifeng Zhang 2 , Ashraful Islam 2 , Min Yang 2
Affiliation  

This paper reports for the first time the occurrence, fates, and carcinogenic risks of 20 substituted polycyclic aromatic hydrocarbons (SPAHs) and 16 priority PAH species in two coking wastewater treatment plants (WWTPs) (plant E and central WWTP). The measured total concentrations of PAHs and SPAHs in raw wastewater of coking plant E were 3700 and 1200 μg·L−1, respectively, with naphthalene (1400 μg·L−1), and fluoranthene (353 μg·L−1) as dominant PAH species and 2-methylnaphthalene (167 μg·L−1), anthraquinone (133 μg·L−1), and 1-methylnaphthalene (132 μg·L−1) as dominant SPAHs. For the 11 methyl-PAHs (MPAHs), 4 oxygenated-PAHs (OPAHs), and 5 nitrated-PAHs (NPAHs) investigated, the biological wastewater treatment process removed 98.6% MPAHs, 83.9% OPAHs, and 89.1% NPAHs. Mass balance analysis result revealed that transformation was the major mechanism to remove low-molecular-weight (LMW) MPAHs (59.9–77.3%), a large part of OPAHs, including anthraquinone, methylanthraquinone, and 9-fluorenone (46.7–49.6%), and some NPAHs, including 2-nitrofluorene and 9-nitroanthrancene (52.9–59.1%). Adsorption by activated sludge mainly accounted for removing high-molecular-weight (HMW) SPAHs (59.6–71.01%). The relatively high concentrations of SPAHs in excess sludge (15,000 μg·g−1) and treated effluent (104 μg·L−1) are of great concern for their potential adverse ecological impacts. SPAHS exhibited similar behaviors in central WWTP, though the influent concentrations were much lower. The concentration levels of SPAHs in the ambient air of coking plant E and central WWTP may also pose potential lung cancer risks (LCR) to the workers through inhalation, where all studied SPAHs except 3-nitrofluoranthene and 7-nitrobenz[a]anthracene exceeded the acceptable cancer risk standards (>10−6) recommended by U.S EPA. This study could help identify the ecological and healthy risks during coking wastewater treatment and provide useful information for policy-making.



中文翻译:

两种焦化废水处理系统中取代多环芳烃的发生、归宿及致癌风险

本文首次报道了两个焦化废水处理厂(WWTPs)(E厂和中心WWTPs)中20种取代多环芳烃(SPAHs)和16种优先PAH物质的发生、归宿和致癌风险。焦化厂E原废水中PAHs和SPAHs的总浓度分别为3700和1200 μg·L -1,其中萘(1400 μg·L -1)和荧蒽(353 μg·L -1)为主PAH 物质和 2-甲基萘 (167 μg·L -1 )、蒽醌 (133 μg·L -1 ) 和 1-甲基萘 (132 μg·L -1) 作为主要的SPAH。对于所研究的 11 种甲基多环芳烃 (MPAH)、4 种含氧多环芳烃 (OPAH) 和 5 种硝化多环芳烃 (NPAH),生物废水处理工艺去除了 98.6% 的 MPAH、83.9% 的 OPAH 和 89.1% 的 NPAH。质量平衡分析结果表明,转化是去除低分子量 (LMW) MPAHs (59.9–77.3%) 的主要机制,大部分 OPAHs,包括蒽醌、甲基蒽醌和 9-芴酮 (46.7–49.6%)和一些 NPAH,包括 2-硝基芴和 9-硝基蒽 (52.9–59.1%)。活性污泥的吸附主要用于去除高分子量(HMW)SPAH(59.6-71.01%)。剩余污泥(15,000 μg·g -1)和处理后的出水(104 μg·L -1)因其潜在的不利生态影响而备受关注。SPAHS 在中心污水处理厂表现出类似的行为,尽管进水浓度要低得多。焦化厂E和中心污水处理厂环境空气中SPAHs的浓度水平也可能通过吸入对工人构成潜在的肺癌风险(LCR),其中除3-硝基荧蒽和7-硝基苯[ a ]蒽外,所有研究的SPAHs都超过了美国环保署推荐的可接受的癌症风险标准(>10 -6)。这项研究有助于识别焦化废水处理过程中的生态和健康风险,并为决策提供有用的信息。

更新日期:2021-05-30
down
wechat
bug