According to the “National Medium and Long-term Science and Technology Development Plan (2006–2020)”, the “Water Pollution Control and Treatment” special project has been set as one of the 16 major national science and technology projects. Since the 1970s, China has been committed to water pollution prevention and control, and especially since the Ninth Five-Year Plan, water pollution control has received unprecedented attention from the state and the government. With rapid economic growth and a significant increase in resource and energy consumption, China is still facing a prominent conflict between social development and water environmental protection. The method established in this study can not only select the technology, but also identify the shortcomings of the technology, therefore realizing the systematization and standardization.Īccording to the ‘China Ecological Environment Bulletin’, in the 2018 state-controlled sections of the ten major river basins, the proportion of sections with water quality of Class IV-V and inferior to Class V is 18.9 % and 6.8 %, respectively eutrophicated lakes (reservoirs) accounted for 29.0 % of the 111 monitored lakes (reservoirs). A2/O has the worst economic and technical performance, mainly due to high investment and operation cost, relatively complex operation management, and poor resistance to hydraulic shock load. Among the six alternative technologies, CWS had the worst environmental benefit, mainly due to the low ammonia removal rate. However, these two technologies also have shortcomings, such as the unsatisfactory economic benefit of SBR, and the high sludge production and poor resistance to hydraulic shock loading of TAS. SBR and TAS can be used as recommended technologies for urban sewage treatment in the study area. The results showed that the comprehensive assessment results obtained by the multidimensional assessment model based on the ideal point method and weighted method were basically consistent. To demonstrate the validity and applicability of the framework, typical urban wastewater treatment technologies were selected for case validation. The framework begins with the definition of water pollution treatment technologies’ decision-making problems and then proceeds through the following: select potential water pollution treatment technologies identify indicators decision making indicator scoring indicator weighting select appropriate assessment model uncertainty analysis and other steps to ultimately determine preferred options. In this study, an MDCA framework for water pollution treatment technologies was developed using a sustainable assessment approach. At present, China has not yet established a standardized methodological system to scientifically evaluate these technologies, which makes it difficult to effectively screen water pollution treatment technologies suitable for specific watersheds or regions and restricts the sustainable development of local economy and society. Water pollution treatment technology assessment methods can be used to guide the selection of scientific and reasonable water pollution treatment technologies.
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