How to remove microplastics in wastewater? A cost-effectiveness analysis
研究了三种废水处理技术和两种污泥管理技术去除微塑料的成本效益，发现膜生物反应器加污泥焚烧是最经济有效的方案，为政府监管提供依据。
Millions of tonnes of plastic litter end up annually in the environment causing damage to the ecosystem. There are currently no standards regulating the amount of microplastic in wastewater, and the question is, should there be? Answering this question requires an understanding of damages microplastic causes to the environment and its removal potential from wastewater. This paper examines the cost-effectiveness of three wastewater treatment (activated sludge, rapid sand filtering and membrane bioreactor) and two sludge management technologies (anaerobic digestion and incineration), in terms of their microplastic removal capacity regarding aquatic and terrestrial ecosystems. We find removing microplastic from wastewater technically feasible and cost-effective. Membrane bioreactor with sludge incineration preventing removed microlitter from accumulating in soils is the most cost-effective option. This gives grounds for extending government regulation to microplastics in wastewater treatment plants. Policy targeting companies using microplastics in their products is, however, necessary to solve the problem ultimately.