基于节能降耗的MBR工艺优化运行措施

Study on Optimizing Operation for MBR Progress Based on Energy Saving and Consumption Reduction

基于MBR系统膜污染控制和节能降耗管理,提出通过优化控制膜池污泥浓度(MLSS)、离线清洗与膜池底部清淤相结合、曝气系统改造三种措施对MBR系统进行优化运行,并结合2017年实际应用情况分析了其对节能降耗及出水稳定达标的贡献。结果表明,控制膜池MLSS在6 000～9 000 mg/L之间,对膜池进行彻底清淤,有利于减缓膜污染进程,提高产水量并降低膜擦洗风量,同时结合后续曝气系统改造应用,MBR系统总曝气量大幅下降,2017年电耗年均值仅为0. 42 kW·h/m^3,较2016年降低17. 7%;优化后在线清洗次氯酸钠用量可降至232. 14 g/m^2膜,较优化前降低18. 75%;出水水质优于一级A排放标准,除TN外,其他出水指标全年70%以上天数可达太湖新地标要求。

In order to control membrane fouling,save energy and reduce consumption,three measures to optimize MBR operation such as optimizing MLSS control of membrane tank,offline cleaning combined with sluge dredging at the bottom of membrane tank and modification of aeration system were proposed. Combined with the actual application in 2017,the contributions of optimizing operation measures to energy saving,consumption reduction and effluent stability were analyzed. The results showed that controlling MLSS between 6 000-9 000 mg/L and thoroughly dredging of sluge in membrane tank both helped to slow down the process of membrane fouling,to increase water yield and reduce membrane scrubbing air volume. After aeration system modification,the total aeration volume of the MBR system declined significantly. The annual average power consumption in 2017 was only 0. 42 kW·h/m^3,which was 17. 7% lower than that in 2016. The sodium hypochlorite consumption for online cleaning of unit membrane could be reduced to 232. 14 g/m^2,which was 18. 75% lower than that before optimization. The effluent quality was superior to the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant( GB 18918-2002). Except TN,the other effluent indexes could reach Discharge Standard of Main Water Pollutants for Municipal Wastewater Treatment Plant & Key Industries of Taihu Area( DB 32/1072-2018) in over 70% days of the year.