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Migration and transformation of organophosphorus flame retardants in integrated vertical-flow constructed wetlands
- Journal of Civil and Environmental Engineering Vol. 45, Issue 3, Pages: 154-163(2023)
- 作者机构：
重庆大学 三峡库区生态环境教育部重点实验室，重庆400045
- 作者简介：
Xiao Haiwen (1976- ), phD, associate professor, main research interest: wastewater treatment of constructed wetlands, E-mail: xiaohaiwen99@163.com.
- 基金信息：National Natural Science Foundation of China(51878093)
DOI：10.11835/j.issn.2096-6717.2022.037
CLC： X703.1Received：02 March 2022，
Published：25 June 2023
- 稿件说明：
移动端阅览
XIAO Haiwen, LEI Yutian, YANG Qingqin, et al. Migration and transformation of organophosphorus flame retardants in integrated vertical-flow constructed wetlands[J]. Journal of Civil and Environmental Engineering, 2023, 45(3): 154-163.
XIAO Haiwen, LEI Yutian, YANG Qingqin, et al. Migration and transformation of organophosphorus flame retardants in integrated vertical-flow constructed wetlands[J]. Journal of Civil and Environmental Engineering, 2023, 45(3): 154-163. DOI： 10.11835/j.issn.2096-6717.2022.037.
摘要
有机磷阻燃剂（OPFRs）是一类对人类健康和生态环境极具危害的新兴污染物。以两种典型OPFRs——磷酸三（2-氯）丙酯（TCPP）和磷酸三（2-氯）乙酯（TCEP）为目标污染物，通过试验研究其在间歇进水复合垂直流人工湿地（IVCW）中的去除效果、沿程去除情况及在基质和植物内的累积量，通过物料平衡分析其在人工湿地生态系统中的输入、输出、累积和转化量，探讨其可能的转化途径。结果表明：复合垂直流人工湿地对水中TCPP和TCEP有良好的去除效果，种植植物稳定运行对其去除率平均分别达74.1%±5.3%和49.3%±5.5%。人工湿地生态系统是输入OPFRs有机质的转化器，从湿地内转化去除的TCPP和TCEP分别占其总输入量的59.72%和44.6%，远大于其在基质和植物内的累积总量（2.37%和1.67%）。基质内生物降解是OPFRs转化的重要途径，TCPP和TCEP的沿程去除与基质内的溶解氧（DO）沿程消耗速率、水中易降解有机物浓度有关。植物种植对TCPP和TCEP去除的促进作用明显，但由于植物体内的浓度限制，难以通过植物收割或加大种植密度来大幅提高湿地对OPFRs的去除率。
Abstract
Organophosphorus flame retardants (OPFRs) are a category of emerging contaminates
which poses significant risks to human health and ecosystem. In this study
two typical OPFRs [tris (1-chloro-2-propyl) phosphate (TCPP) and tris (2-chloroethyl) phosphate (TCEP)] were selected as target pollutants. The removal efficiencies
concentration variations along the flow path and the accumulations of these two OPFRs in substrate and plant in integrated vertical-flow constructed wetland (IVCW) with intermittent inflow were investigated. The inflow and outflow mass
accumulation and transformation of TCPP and TCEP in IVCW based on mass balance were analyzed
and the possible transformation mechanisms were discussed. The results show that IVCW could effectively remove TCPP and TCEP
and the removal rate of TCPP and TCEP in stable stage after planting plants were 74.1%±5.3% and 49.3%±5.5%
respectively. Constructed wetland system was a converter of OPFRs
and the mass of TCPP and TCEP transformed in IVCW was far greater than that accumulated in substrate and plant (2.37% and 1.67%)
which accounting for 59.72% and 44.6% of the total mass flow into the IVCW. Microbial degradation in substrate was an important process of OPFRs removal
and variations of TCPP and TCEP concentrations along the flow path were significantly correlated with the DO consumption rate and the concentration of degradable organic matter. Plant can enhance the removal performance
but due to the limitation of concentration in plant
it is not practical to significantly improve the removal rate by harvesting or increasing planting density.
关键词
Keywords
references
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