Comprehensive technical and economic evaluations of sewage treatment processes

Abstract:

Comprehensive technical and economic evaluations were performed for eight kinds of domestic sewage treatment processes commonly used in wastewater treatment plants in China, including conventional aeration, hydrolysis – aerobic process, AB method, A/O method, A2/O method, alternating type oxidation ditch, integrated oxidation ditch and SBR. Three major categories of total 13 evaluation factors, including treatment effect, economic aspect and project implementation were analyzed and compared through a sampling investigation. A multi-factor evaluation system was established and the factor weights were set. Evaluations were performed with fuzzy mathematics method and the results were compared with those of expert evaluations. Research results showed that A2/O, A/O and oxidation ditch were more applicable to the sewage treatment plants in large or medium-sized cities, among which A2/O was particularly prominent.