摘要
某污水处理厂的生物处理单元采用MSBR工艺,该厂在低温条件下丝状菌大量繁殖,菌丝向外延伸使得菌胶团之间交织缠绕,导致污泥絮体松散、沉降性能变差,泥水分离效率降低甚至出现出水跑泥的现象。为解决这个问题,向系统投加低剂量臭氧,使其与回流污泥反应。对系统DSVI、MLSS、MLVSS等值进行监测,并定期镜检观察污泥絮体形态。投加臭氧后系统DSVI值整体呈下降趋势,污泥絮体也更加密实。结果表明,低剂量的臭氧与活性污泥反应能够抑制丝状菌的生长和改善污泥絮体结构,改善沉降性能,控制了污泥膨胀的发生。同时臭氧反应并没有破坏其他微生物的代谢功能,保证了出水水质达标。
In a wastewater treatment plant which uses MSBR as its biological treatment unit, the blooms of filamentous bacteria and filament' s extension under low temperature can make the zoogloea intertwine, destroy the floc structure, result in a poor settleability, reduce the separation of sludge and water, and, in severe cases, can lead to washout. Adding low-dose ozone which reacts with recycled sludge is a way to resolve this problem. The values of diluted sludge volume index (DSVI) , MLSS and MLVSS were monitored, and the sludge floc morphology was observed by microscopy. The DSVI trended to decrease, and the floc became more compact after adding ozone. The reaction between low-dose ozone and activated sludge could inhibit the growth of filamentous bacteria and improve the floc structure, thus improving the settleability and controlling the sludge bulking. Ozone reaction did not destroy the metabolism of other microorganisms, ensuring the effluent quality to meet the discharge standard.
出处
《中国给水排水》
CAS
CSCD
北大核心
2015年第15期35-39,共5页
China Water & Wastewater
关键词
丝状菌膨胀
臭氧
低温
沉降性能
污泥絮体结构
filamentous bulking
ozone
low temperature
settleability
floc structure