| 基于Meta分析的污水处理工艺对微塑料去除效果影响 |
| 摘要点击 1444 全文点击 399 投稿时间：2022-08-13 修订日期：2022-09-05 |
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| 中文关键词 微塑料 Meta分析 污水处理工艺 赋存特征 去除效果 |
| 英文关键词 microplastics Meta-analysis wastewater treatment processes occurrence characteristic removal efficiency |
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| 中文摘要 |
| 污水处理厂(WWTPs)是微塑料"源-汇"过程的重要场所,污水处理工艺和微塑料特性对微塑料去除效果的影响有待深入探讨.综述了57篇文献中78个WWTPs的微塑料赋存特征,基于Meta分析探讨了不同污水处理工艺和微塑料赋存特征对其去除效果的影响.结果表明:①进水和出水中微塑料的丰度范围分别为1.56×10-2~3.14×104n·L-1和1.70×10-3~3.09×102 n·L-1,污泥中的微塑料赋存丰度范围为1.80×10-1~9.38×103 n·g-1;②以氧化沟、生物膜和传统活性污泥为核心工艺的WWTPs对微塑料的总去除率(>90%)优于序批式活性污泥、厌氧-缺氧-好氧和缺氧-好氧工艺;③一级处理对微塑料的去除率(62.87%)略高于二级处理(55.78%)和三级处理(58.45%),"格栅+沉砂池+初沉池"是一级处理中去除率最高的工艺组合,膜生物反应器在二级处理中去除率最高,过滤为三级处理最佳技术;④WWTPs对薄膜、泡沫和碎片微塑料的去除率(>90%),高于纤维(88.36%)和球状(87.23%),粒径>0.5 mm的微塑料比<0.5 mm的更容易去除,WWTPs对聚乙烯(PE)、聚对苯二甲酸乙二醇酯(PET)和聚丙烯(PP)的去除效果较好(>80%). |
| 英文摘要 |
| Microplastics (MPs) are ubiquitous emerging pollutants that have been found in the marine, freshwater, air, and soil environments. Wastewater treatment plants (WWTPs) play an important role in releasing MPs to the environment. Therefore, understanding the occurrence, fate, and removal mechanism of MPs in WWTPs is of great importance towards microplastic control. In this review, the occurrence characteristics and removal rates of MPs in 78 WWTPs from 57 studies were discussed based on Meta-analysis. Specifically, the key aspects regarding MPs removal in WWTPs, such as wastewater treatment processes and MPs shapes, sizes, and polymer compositions were analyzed and compared. The results showed that:① the abundances of MPs in the influent and effluent were 1.56×10-2-3.14×104 n·L-1 and 1.70×10-3-3.09×102 n·L-1, respectively. The abundance of MPs in the sludge ranged from 1.80×10-1 to 9.38×103 n·g-1. ② The total removal rate (>90%) of MPs by WWTPs using oxidation ditch, biofilm, and conventional activated sludge treatment processes was higher than that using sequencing batch activated sludge, anaerobic-anoxic-aerobic, and anoxic-aerobic processes. ③ The removal rate of MPs in primary, secondary, and tertiary treatment process were 62.87%, 55.78%, and 58.45%, respectively. The combination process of "grid+ sedimentation tank+primary sedimentation tank" had the highest removal rate towards MPs in primary treatment processes, and the membrane bioreactor had the highest one beyond other secondary treatment processes. Filtration was the best process in tertiary treatment. ④ The film, foam, and fragment MPs were easier to remove (>90%) than fiber and spherical (<90%) MPs by WWTPs. The MPs with particle size larger than 0.5 mm were easier to remove than those with particle size smaller than 0.5 mm. The removal efficiencies of polyethylene (PE), polyethylene terephthalate (PET), and polypropylene (PP) MPs were higher than 80%. |
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