State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 150090 Harbin, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 150090 Harbin, China.
Sci Total Environ. 2024 Nov 15;951:175784. doi: 10.1016/j.scitotenv.2024.175784. Epub 2024 Aug 24.
Plant recovery plays a vital role in reclaiming bioresources from constructed wetland wastewater treatment systems. A comprehensive understanding of the environmental impacts and economic benefits associated with various wetland plant resourcing methods is critical for advancing both plant resource recovery and the application of wetlands in wastewater treatment. In this study, life cycle assessment was employed to evaluate the environmental impacts and costs of seven wetland plant recovery methods. In addition, the potential benefits of extending plant resource recovery within system boundaries were explored to enhance the overall advantages of constructed wetlands for wastewater treatment. The use of wetland plants for biofertilizer production had the lowest environmental impact (-8.52E-03), whereas the use of wetland plants for biochar production was the most cost-effective approach (-0.80€/kg). The introduction of a plant resource recovery component could significantly reduce the environmental impacts of constructed wetland wastewater treatment systems. The environmental impacts and costs of constructed wetland wastewater treatment systems that incorporate plant resource recovery into the system boundary are better than activated sludge methods and highly efficient algal ponds, except for the global warming potential (GWP). The use of plants for biofertilizer production could cut the environmental impacts of constructed wetland wastewater treatment systems by up to 85 % and the costs by 65 %, making it the most suitable method of plant use. Additionally, prioritizing the reduction of greenhouse gas emissions from constructed wetlands should be a primary optimization goal. The findings of this study provide valuable support for the implementation of wetland plant resourcing in constructed wetland wastewater treatment systems.
植物回收在从人工湿地废水处理系统中回收生物资源方面起着至关重要的作用。全面了解各种湿地植物资源方法相关的环境影响和经济效益，对于推进植物资源回收和湿地在废水处理中的应用都至关重要。在本研究中，采用生命周期评估方法评估了七种湿地植物回收方法的环境影响和成本。此外，还探讨了在系统边界内扩展植物资源回收的潜力，以提高人工湿地处理废水的整体优势。利用湿地植物生产生物肥料的方法对环境的影响最小（-8.52E-03），而利用湿地植物生产生物炭的方法则具有最高的成本效益（-0.80€/kg）。引入植物资源回收组件可以显著降低人工湿地废水处理系统的环境影响。将植物资源回收纳入系统边界的人工湿地废水处理系统的环境影响和成本优于活性污泥法和高效藻类塘，除了全球变暖潜势（GWP）。利用植物生产生物肥料可以将人工湿地废水处理系统的环境影响降低多达 85%，成本降低 65%，是最适合的植物利用方法。此外，优先减少人工湿地的温室气体排放应成为主要的优化目标。本研究的结果为在人工湿地废水处理系统中实施湿地植物资源提供了有价值的支持。
