摘要
为探究我国城市污水厂尤其是氧化沟工艺污水厂中微塑料(MPs)的形态特征和去除规律,本文对邯郸市某氧化沟工艺污水厂两期工程各处理单元MPs的存在形态和去除效能进行全流程探析.结果显示,MPs主要形状为纤维状,占比56.5%,其次为碎片和薄膜状,颗粒状占比最少仅为4.0%;粒径范围主要在150~5000μm区间,其中150~500μm的MPs占比最高为43.0%;主要类型为聚乙烯、聚酯和聚丙烯,分别占比28.9%、17.3%和22.5%.形状与粒径对去除效能的影响分析显示,纤维状MPs去除难度最大;随粒径降低,去除难度增加.该厂一期工程和扩建工程总体去除率分别为(92.0±2.5)%和(83.6±1.6)%.各级工艺及各处理单元去除率分析显示,起关键去除作用的是二级处理和深度处理,处理单元为氧化沟沉淀池(区),主要机理是物理沉淀和滤池截留去除.
In order to investigate the morphological characteristics and removal patterns of microplastics in urban wastewater plants in China,especially oxidation ditch process wastewater plants,the presence patterns and removal efficacy of MPs in each treatment unit of a two-phase project of an oxidation ditch process wastewater plant in Handan City were thoroughly analyzed.The results showed that the main shape of MPs was fibrous,accounting for 56.5%,followed by fragments and films,with particles accounting for the smallest proportion at only 4.0%.The particle size range was mainly between 150 and 5000μm,with MPs in the 150~500μm range accounting for the highest proportion at 43.0%.The main types were polyethylene,polyester,and polypropylene,accounting for 28.9%,17.3%,and 22.5%,respectively.The analysis of the effect of shape and particle size on removal efficacy revealed that fibrous MPs were the most difficult to remove,and as particle size decreased,the difficulty of removal increased.The overall removal rates for the first phase of the plant and the expansion project were(92.0±2.5)%and(83.6±1.6)%,respectively.The analysis of removal rates for each process level and treatment unit showed that the key roles in removal were played by secondary treatment and deep treatment,with the treatment unit being the oxidation ditch sedimentation tank.The main mechanisms were physical sedimentation and retention in the filtration tank.
作者
齐杰
王伟
刘旭光
孟鑫
翟世娇
孙广垠
QI Jie;WANG Wei;LIU Xu-guang;MENG Xin;ZHAI Shi-jiao;SUN Guang-yin(Hebei Technology Innovation Center of Water Pollution Control and Water Ecological Remediation,College of Energy and Environmental Engineering,Hebei University of Engineering,Handan 056038,China;Hebei University of Finance,Baoding 071051,China;Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environment Science,Beijing 100085,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第11期6156-6163,共8页
China Environmental Science
基金
河北省科技厅中央引导地方科技发展资金资助项目(236Z3603G)
河北省高校青年基金资助项目(QN2022075)。
关键词
氧化沟
污水厂
微塑料
形态特征
去除效能
oxidation ditch
sewage treatment plant
microplastics
morphological characteristics
removal efficiency
