碳源对生物膜同步硝化反硝化脱氮影响

Influences of Carbon Source on Simultaneous Nitrification and Denitrification of Biomembrane Reactor

利用序批式移动床生物膜反应器研究了有机碳源对低碳氮比ρC/ρN(指ρCOD/ρTN,以下同)生活污水同步硝化反硝化脱氮的影响,结果表明,在无外加碳源时,同步硝化反硝化条件下TN去除率为59.8%,COD平均去除率为83.12%,NH+4-N去除率为94.9%(最高达到99.8%);分别以淀粉、葡萄糖和甲醇为外加碳源,ρC/ρN=7时,发现投加外碳源有利于有机物、NH+4-N和TN的降解和转化,NH+4-N转化受碳源种类影响不大,投加淀粉时有机物降解不完全导致系统有恶化趋势,投加甲醇碳源时系统脱氮效率最高,TN去除率达84.5%,投加葡萄糖时,TN去除率为80.55%,从安全和经济方面考虑,确定投加葡萄糖较为合适.

The present paper aims to introduce research of the effect of organic carbon on the denitrogenation using simultaneous nitrification and denitrification in moving-bed biofilm reactor.COD/TN ratio was about 3 in real domestic wastewater. The result of the treatment show that at the end of aeration the average removing rate of TN,NH＋4-N and COD can reach 59.8%,83.12% and 94.9%,respectively.In order to improve the efficiency of removing TN,the experiment added amylum,glucose and methanol.The results show that adding organic carbon can improve the degradation of COD and nitrogen.When adding amylum,COD degradation was incomplete and leaded to the system performance deterioration.When adding methanol and glucose,the TN removal ratio reached 84.5% and 80.55%,respectively.But considering factors of security and economy,adding glucose is more appropriate.