晚期渗滤液脱氮过程中的抑制现象及其消除

 对于垃圾填埋过程中高氨氮浓度、低C/N的晚期渗滤液,反硝化碳源不足会造成A/O脱氮系统的亚硝酸积累,导致对氨氧化和亚硝酸氧化过程的抑制作用.A,²/O流程中的厌氧处理对难降解有机物的水解酸化作用可为后续反硝化提供易降解有机碳源,可消除亚硝酸盐的积累及其对硝化过程的抑制.试验表明,厌氧处理可使氨氧化速率和反硝化速率提高约1倍和1.3倍,分别达0.123mgN/(mgMLSSd)和0.0675mgN/(mgMLSSd),TN去除率由8%提高到15%.使浓度高达1000mg/L的氨氮,在0.138mgN/(mgMLSSd)的进水负荷下较为彻底地氧化为安全的硝酸盐.

The inhibition phenomenon of denitrification process of later period leachate and its elimination

The lack of carbon sources for denitrification of later period leachate with high ammonia nitrogen concentration and low C/N could create the nitrous acid A/O denitrification system with concentration higher than 200mgN/L, while this accumulation inhibited obviously the ammonia and nitrous acid oxidation processes. The anaerobic treatment in A2/O technological process provided readable biodegradable organic carbon source for the follow-up denitrification through hydrolysis acidification action of the refractory organics and eliminated the nitrite accumulation and its inhibition on nitrification process. The anaerobic treatment could enhanced the velocities of ammonia oxidation and denitrification, about 1 and 1.3 multiples, reaching 0.123mgN/(mgMLSSd) and 0.0675mgN/(mgMLSSd), respectively. The TN removal rate increased from 8% to 15%. The ammonia nitrogen with concentration high up to 1000mg/L might be oxidated to be safe nitrate rather basically, under the influent water load of 0.138mgN/(mgMLSSd).