中文摘要：

污水处理、处理水处理和污泥处理是污水处理综合系统的3个基本单元.本文运用能值分析和新构建的能值指标评估了处理水回用与排放、污泥填埋与堆肥对系统整体性能的影响.该系统的价值包括环境收益和产品输出两方面.前者可通过污水处理前后的环境服务差值计算.由于系统内部物质和能量的转化数据难以获知,产品价值通过新提出的替代价值核算.结果表明：“污水处理＋处理水回用＋污泥填埋”的竞争力最高,“污水处理＋处理水回用＋蚯蚓堆肥”的可持续性能最高;处理水回用和蚯蚓堆肥均有助于提高系统可持续性;处理水回用与否应综合考虑处理水水质和当地条件;污泥蚯蚓堆肥的资源化效率还有待提高;改进的能值指标更适宜于污水处理综合系统效益评估.

英文摘要：

Sewage treatment,treated water treatment and sludge treatment are three basic units of an integrated sewage treatment system. This work assessed the influence of reusing or discharge of treated water and sludge landfill or compost on the sustainability of an integrated sewage treatment system using emergy analysis and newly proposed emergy indicators. This system＇s value included its environmental benefits and the products. Environmental benefits were the differences of the environmental service values before and after sewage treatment. Due to unavailability of data of the exchanged substance and energy in the internal system,products＇ values were attained by newly proposed substitution values. The results showed that the combination of sewage treatment,treated water reuse and sludge landfill had the strongest competitiveness,while the combination of sewage treatment,treated water reuse and earthworm compost was the most sustainable. Moreover,treated water reuse and earthworm compost were helpful for improving the sustainability of the integrated sewage treatment system. The quality of treated water and local conditions should be also considered when implementing the treated water reuse or discharge. The resources efficiency of earthworm compost unit needed to be further improved. Improved emergy indices were more suitable for integrated sewage treatment systems.