温度对水解反硝化脱氮的影响

Effect of Temperature on Hydrolysis-Denitrification Process

采用水解反硝化脱氮工艺,将水解酸化与反硝化脱氮过程相结合,取代缺氧反硝化,解决城镇污水冬季脱氮效果差的问题.在水解反硝化工艺的中试系统中,氨氮和总氮的去除效果受温度的影响较小,冬季和夏季氨氮去除率分别达到98.3％和98.4％,总氮去除率分别为65.2％和68.0％.以水解反硝化污泥与AAO工艺中的缺氧池污泥为研究对象,对比分析温度对两种污泥比反硝化速率和耗碳率的影响.结果显示：温度对水解池污泥的影响显著小于缺氧池污泥,在25、30℃两者反硝化速率相当,但是当温度为8、15和20℃下,水解池污泥的最大比反硝化脱氮速率分别为缺氧池污泥的1.7倍、1.3倍和1.4倍;同时,在各温度条件下,水解池污泥的耗碳率基本为缺氧池污泥的51.2％～81.7％.

To solve the problem of poor nitrogen removal capacity in winter, the hydrolysis-denitrification process combining hydrolytic acidification and denitrification process within single reactor was induced to treat municipal wastewater. The pilot test showed that the average removal rates of ammonia nitrogen of hydrolysis-denitrification process were 98.3% and 98.4% in winter and summer, respectively. And the average removal rates of total nitrogen were 65.2% and 68.0%, respectively. According to the nitrogen removal of pilot test, the activated sludge in hydrolysis-denitrification process and AAO process were studied to investigate the effect of temperature on specific denitrification rate and carbon source consumption rate. It is found that the temperature on activated sludge in hydrolysis-denitrification process had smaller effects than that in AAO process. In the two cases, namely the temperature are 25 ℃, 30 ℃, respectively, both denitrification rates of them was similar. However, when the temperature were 8℃. 15℃ and 20℃, the specific denitrification rate of hydrolysis-denitrification sludge was 1.7.1.3 and 1.4 times the anoxic-denitrification sludge, respectively. In addition, the carbon source consumption rate of hydrolysis-denitrification sludge was 51.2%--81.7% of the anoxic-denitrification sludge.