乌鲁木齐市居民小区生活污水再生利用经济性分析

Economic Analysis of Wastewater Reclaimation and Reuse for Residential Area in Urumqi City

城市生活污水处理达标后可作为景观和绿化用水。为实现污水资源化,提高水资源利用率,对乌鲁木齐市已建成的32座小型生活污水回用工程进行详实调查,并对出水水质稳定达标的几种处理工艺的单方水投资及占地指标进行分析。结果表明,生物接触氧化法处理小区生活污水具有明显的效能,投资成本低,推荐为绿化回用水的主流工艺。探讨各种污水处理工艺的处理规模与经济指标之间的合理匹配关系。结果表明:生物接触氧化法工艺处理规模在500 m3/d时最经济;MBR工艺处理规模在1000 m3/d时最经济;“CASS+曝气生物滤池”工艺出水水质可以达到景观用水标准,适合规模小于1000 m3/d的工程。通过接触氧化法(AO)典型工艺实例,分析其经济成本,为乌鲁木齐挑选经济有效的再生水回用方案提供借鉴。

Treated domestic sewage can be used as landscape and greening water after reaching the discharge standard.In order to realize the utilization of sewage resources and improve utilization rate of water resources,a detailed investigation of 32 small domestic sewage reuse projects built in Urumqi is conducted,unit investment and land quota of several treatment processes with stable water quality standards are also analyzed.The results show that biological contact oxidation method has obvious efficiency in treating residential sewage,and the investment cost is low.Mainstream process of greening and returning water is recommended.At the same time,reasonable matching relationship between treatment capacity of various sewage treatment processes and economic indicators is also discussed.Biological contact oxidation process has the most economical scale of 500 m3/d.MBR process has the most economical scale of 1000 m3/d.Effluent treated by“CASS+aerated biological filter”can reach landscape water standard,and is suitable for engineering scale of less than 1000 m3/d.Economic cost of contact oxidation process(AO)is analyzed through a typical process example,so as to provide reference for Urumqi to select an economic and effective scheme for reclaimed water reuse.