污水处理厂尾水发电强化能源回收工程实例

Case of Tailwater Power Generation Project in a WWTP for Enhancing Energy Recovery

为积极响应国家“双碳”战略,全面提升污水处理厂再生水资源利用水平,重庆市某污水处理厂采用“污水处理厂+小水电”模式,仅对污水处理厂原尾水排放管进行技术改造,利用经处理达标后的尾水发电,实现尾水资源再利用。主要介绍了工程选型、工程布置、工程设计、调试运行以及能耗评价。经调试运行后,该工程平均发电量为1950 kW·h/d,约占污水处理厂每日用电量的15%,预计投资收益率为11.2%,投资回收期约9年,工程综合能耗指标仅占全国万元GDP能耗指标的4.45%。该工程可为大量存在的分散式小型污水处理厂尾水资源化利用,实现污水处理行业绿色循环发展提供理论支撑与案例参考。

In order to actively respond to the national“carbon peaking and carbon neutrality”strategy and comprehensively improve the utilization level of recycled water resources,a wastewater treatment plant(WWTP)in Chongqing adopted the“WWTP and small hydropower”mode,which only conducted technical transformation on the original tailwater discharge pipe,and used the tailwater after treatment to generate power and achieve its reuse.The project type selection,project layout,project design,commissioning operation,as well as energy consumption evaluation are introduced.After commissioning operation,the average power generation of the project is 1950 kW·h/d,accounting for about 15%of the daily electricity consumption of the WWTP.The expected investment return rate is 11.2%,and the investment payback period is about 9 years.The comprehensive energy consumption index of the project only accounts for 4.45%of the national 10000 yuan GDP energy consumption index.This project could provide theoretical support and case reference for the utilization of tailwater resource from a large number of dispersed small WWTPs,and achieve green circular development in the sewage treatment industry.