低C/N条件下MUCT工艺的反硝化除磷特性

以C/N较低的污水为处理对象,重点研究和分析了MUCT工艺缺氧区的反硝化除磷特性.结果表明,①缺氧区1因为COD浓度相对较高,回流污泥中的硝酸盐氮优先被传统反硝化菌利用,不能作为DPB的电子受体,所以主要发生释磷反应;②缺氧区2内DPB利用厌氧段贮存大量PHB为碳源,以硝酸盐氮为电子受体进行吸磷,且吸磷量逐日提高,从最初的0 .93 mg/Ｌ增加至18 mg/Ｌ,缺氧吸磷率最终稳定在40%左右;③缺氧区3内,由于硝酸盐氮和COD浓度过低,进行无效释磷反应过程,释磷量在0 .27～3 mg/Ｌ之间;④系统对COD、TN、TP的去除率较高,出水TN和TP浓度分别在10 mg/Ｌ和0 .9 mg/Ｌ以下.

Character of Denitrifying Phosphorus Removal Using MUCT Process: Operation at Low C/N Rate

The effect of phosphorus uptake in the anaerobic zone of MUCT process fed with low C/N rate wastewater was studied. The experimental results shows that: (1) Because of the concentration of the COD is relative higher, nitrate is firstly used by the traditional denitrifying bacteria in the cycle sludge, and can not act as the electron acceptor for DPB. So the main action in the first anaerobic zone is phosphate release; (2) The DPB utilizes the PHB as the carbon stored in the anaerobic zone, and nitrate as electron acceptor to uptake phosphorus and the amount increases daily from 0.93 mg/L to 18 mg/L, and the anaerobic phosphorus rate stabilizes to 40 percent finally in the second anaerobic zone; (3) The ineffective phosphorus release process occurs in the third anaerobic zone because the lower nitrate and COD concentration,and phosphate release amount is from 0.27 to 3 mg/L; (4) The COD, TN, TP removal rates are higher and the TP and TN concentration in effluent is below 10 mg/L and 0.9 mg/L respectively.