硝态氮及碳源浓度对A-AAO工艺厌氧释磷影响的研究

为进一步提高A-AAO工艺的厌氧释磷效率,本文以稳定运行A-AAO工艺的污泥为研究对象,考察碳源浓度和污泥回流液硝态氮浓度对厌氧释磷速率的影响。研究结果表明:污泥回流液硝氮浓度越高,厌氧释磷速率越缓慢,且最大释磷量也较低,硝氮浓度从0 mg/L增加到20 mg/L时,释磷速率从0.150 mg TP/(gMLVSS·min)降低到0.103 mgTP/(gMLVSS·min),最大释磷量也从23.95 mg/L减少到15.97 mg/L。碳源浓度显著影响了厌氧区最大释磷量,进水碳源浓度(以乙酸钠投加计算)分别为100,200和300 mg/L,最大释磷总量分别为10.59 mg/L,19.62 mg/L及25.48 mg/L。

Effects of Nitrate Nitrogen and Carbon Source Concentration on Anaerobic Phosphorus Release on A-AAO Process

The effect of nitrate nitrogen and carbon source concentration on anaerobic phosphorus release was investigated in this paper to improve the efficiency of the activated sludge anaerobic phosphorus release of the Modified A-AAO process. Results showed that higher nitrate concentration result in slower the anaerobic phosphorus release rate and lower phosphorus release con-tent. When the concentration of nitrate nitrogen increased from 0 mg/L to20 mg/L, the phosphorus release rate reduced from 0.150 mgTP/(gMLVSS·min)to around 0.103 mgTP/(gMLVSS·min), and the largest amount of phosphorus release also re-duced from23.95 mg/L to15.97 mg/L. The concentration of carbon source significantly affected the maximum phosphorus release in anaerobic zone,the largest total phosphorus release were10.59 mg/L,19.62 mg/L and 25.48 mg/L when the concentration of carbon source was100,200 and300 mg/L(sodium acetate),respectively.