碳源投加量对除磷脱氮的影响

Influence of carbon source dosing quantity on phosphorus removal denitrification

为了提高氧化沟脱氮除磷的效果,提出了改良型氧化沟工艺,并且进行了碳源投加量对除磷脱氮的影响的试验验证.首先,给出了合肥市某污水处理厂的工程概况,并且提出了试验材料与方法.其次,分析了改良型氧化沟工艺在该污水处理厂运行效果,试验表明:(1)碳源投加量越大,释磷量越大;(2)在厌氧时污泥释磷越充分,曝气时吸磷量越大,在曝气180min后,80mg/L碳源污泥吸磷量明显小于160mg/L碳源污泥吸磷量;(3)在180min,C:N=5:1时,其硝酸盐含量和亚硝酸盐含量均小于C:N=3:1时的含量,碳源越充足,硝化反硝化效果越好,最终TN含量越小.

In order to improve the nitrogen and phosphorous effect of oxidation ditch, the anaerobic anoxic oxide ditch is put forward, and the verified test is carried out. First, the engineering situation of a sewage treatment plant is given, and the test materials and methods are put forward. Second, the effect of bio-nitrogen and phosphorus removal of the anaerobic-anoxic oxidation ditch, the wastewater quality and the change situation of nitrogen and phosphorus have been discussed. The test indicates that the more the carbon source dosing quantity is, the more the release of phosphorus will be. In anaerobe zone, more sufficient the sludge release phosphorus, phosphorus uptake would be larger in aeration. After 180-minute-aeration, it＇s obvious that source of carbon sludge＇s phosphorus uptake whose concentration is 80 mg/L is lower than that whose concentration is 160 mg/L.On the end of 180 minutes, carbon nitrogen ratio is 5 to 1, the nitrate content and nitrite content are both less than that when the carbon nitrogen ratio is 3 to 1. The more enough the carbon source is , the better nitrifica- tion denitrification effect and the smaller the final TN content will be.