[1]张庭秀,李田.浅基质层干植草沟对道路径流中PAHs的去除效果[J].中国给水排水,2021,37(11):96-103.
　ZHANG Ting-xiu,LI Tian.Removal Efficiency of Polycyclic Aromatic Hydrocarbons in Road Runoff by Dry Grass Swale with Shallow Substrate Layer[J].China Water & Wastewater,2021,37(11):96-103.
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浅基质层干植草沟对道路径流中PAHs的去除效果

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第37卷 期数: 2021年第11期 页码: 96-103 栏目: 出版日期: 2021-06-01
Title:
Removal Efficiency of Polycyclic Aromatic Hydrocarbons in Road Runoff by Dry Grass Swale with Shallow Substrate Layer
作者:
张庭秀，李田
(同济大学环境科学与工程学院，上海200092)
Author(s):
ZHANG Ting-xiu,LI Tian
(School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China)
关键词:
道路径流; 多环芳烃; 干植草沟; 低影响开发; 海绵城市建设
Keywords:
road runoff; polycyclic aromatic hydrocarbons (PAHs); dry grass swale; low impact development; sponge city development
摘要:
上海市道路径流中的多环芳烃（PAHs）平均浓度达到3 996 ng/L，与其他国家相比污染较严重。以前期已稳定运行1年的浅基质层干植草沟中试系统为处理设施进行现场试验，研究设施对道路径流中美国EPA提出的16种优先控制PAHs的控制效果及去除机制。结果表明，监测期内设施出水PAHs浓度显著低于进水浓度（p＜0.05），∑16PAHs和具有致癌性或可疑致癌性的∑6PAHs的出水浓度范围分别为172.40~365.05 ng/L和9.70~99.97 ng/L。前置沉淀池对PAHs的去除效果不佳。干植草沟设施对高分子质量PAHs的去除率与TSS呈显著正相关，主要伴随基质对TSS的过滤、拦截而被去除；低分子质量PAHs主要依靠吸附作用被去除，水力负荷的升高影响其去除效果。干植草沟设施对苯并［a］芘的去除率达到98.00%，出水浓度低于《污水综合排放标准》（GB 8978—1996）规定的限值（30 ng/L），达标率为100%，干植草沟即使基质层较浅也可有效控制路面径流对受纳水体的PAHs污染。
Abstract:
The average concentration of polycyclic aromatic hydrocarbons (PAHs) in road runoff in Shanghai is 3 996 ng/L, which is higher than that in other countries. A field test was carried out in a pilot-scale dry grass swale system with shallow substrate layer which had been operated stably for one year, and the control performance and removal mechanism of 16 kinds of priority controlled PAHs proposed by US EPA were explored. During the monitoring period, PAHs concentration in the effluent of the facility was significantly lower than that in the influent (p＜0.05), and concentrations of ∑16PAHs and ∑6PAHs (carcinogenicity or suspected carcinogenicity) in the effluent were 172.40-365.05 ng/L and 9.70-99.97 ng/L, respectively. PAHs in the road runoff could not be effectively removed by the pre-sedimentation tank. The removal rate of high molecular weight PAHs was positively correlated with the removal rate of TSS, indicating that the removal of these PAHs mainly depended on filtration and interception of TSS by substrate. Low molecular weight PAHs were mainly removed by adsorption, and the removal performance was affected by the increase of hydraulic load. The removal rate of benzo(a)pyrene was 98.00%, and its concentration in the effluent was lower than the limitation (30 ng/L) in Integrated Wastewater Discharge Standard (GB 8978-1996) with compliance rate of 100%, indicating that the dry grass swale with shallow substrate layer could effectively control the PAHs pollution in road runoff to receiving water body.
更新日期/Last Update: 2021-06-01