摘要
浙江省湖州市某污水处理厂采用传统AAO工艺,建设规模为0.5×10~4 m^3/d,实际处理水量为0.33×10~4 m^3/d。实际运行过程中,进水COD_(Cr)浓度为设计值的19.3%,TN为设计值的48.22%,污水厂长期处于低负荷运行状态,给污水厂稳定达标运行造成较大困扰。通过采用间歇曝气的方式运行,同时将污泥浓度由原设计值3 g/L降低至1.5 g/L;关闭内回流,增加200%外回流;精确投加碳源等工艺参数进行了相应的优化,调整后出水水质稳定达到一级A排放标准。调整后吨水电耗节约0.096元/m^3,直接运行成本预计节约17.5万元/年。
AAO process is adopted in a wastewater treatment plant(WWTP)in Huzhou City of Zhejiang Province. The design scale is0. 5×10~4 m^3/d, and the actual handing capacity is 0. 33×10~4 m^3/d. In actual operation, the influent COD_(Cr)concentration is 19. 3% of the design value, and TN is 48. 22% of the design value. The wastewater treatment plant is in a low loading operation for a long time.The sludge concentration is reduced from the original design value 3 g/L to 1. 5 g/L by means of intermittent aeration. Then sludge inward reflux is stoped and external reflux concentration is increased by 200%. Then BOD concentration is added precisely. By optimizing these process parameters, effluent water quality reaches to level A emission standard. The water cost of per ton is saved0. 096 yuan, and the direct operation cost would be saved 175 000 yuan per year.
出处
《净水技术》
CAS
2018年第1期77-81,共5页
Water Purification Technology
关键词
污水厂
低负荷运行
AAO工艺
间歇曝气
分析与调控
wastewater treatment plant(WWTP)
low-loading operation
AAO process
intermittent aeration
analysis and controlling
