Abstract:

A pilot-scale biological research has been made for study on short-cut nitrification and denitrification of low m(COD):m(TN)ratio municipal wastewater under normal temperature. When the influent COD is 130-210 mg/L, m(COD):m(TN)ratio is 3.2-4.5, and the water temperature is 19-23 ℃, by controlling dissolved oxygen in the main aeration tank between 0.2-0.6mg/L short -cut nitrification and denitrification has been achieved in low levels of oxygen-oxic(LO)and anoxic-low levels of oxygen-oxic(ALO)processes. Therefore, as the HRT is 8 h, backflow activated sludge ratio is 1.0, mixed liquid recycle ratio is 2.0, and MLVSS is 1 900 mg/L, TN removal rates of LO and ALO process are up to 64% and 74% respectively.

Key words: municipal wastewater, low levels of dissolved oxygen, short-cut nitrification and denitrification

摘要：

在常温下对低碳氮比城市污水进行了短程生物脱氮中试研究。当进水COD为130~210mg/L、m（COD）：m（TN）为3.2~4.5、水温19~23℃时，通过控制低氧曝气区的DO为0.2~0.6mg/L，在低氧-好氧（LO）和缺氧-低氧-好氧（ALO）两种工艺中均实现了短程硝化反硝化过程。当HRT为8 h、污泥回流比和内回流比分别为1和2、MLVSS为1 900mg/L时，LO、ALO工艺的TN去除率分别达到64%和74%。

关键词: 城市污水, 低溶解氧, 短程硝化反硝化

CLC Number: 

• X703.1