厌氧序批式反应器的厌氧氨氧化工艺启动运行

在厌氧序批式反应器中接种好氧硝化污泥,进行了培养厌氧氨氧化污泥的研究。在进水pH值为7.2～7.8,温度为30±1℃的条件下运行142d,成功培养出厌氧氨氧化污泥。反应器内的污泥量(以VSS计)由原来的9.90g/L增加到18.99g/L,水力停留时间为1.20d,总氮容积负荷为0.4318kg/(m·3d)时,总氮去除率最高达到93.3%,平均为80.5%,氨氮和亚硝酸盐氮的去除率最高分别达到93.9%和99.8%,平均去除率分别为81.2%和85.7%,氨氮和亚硝酸盐氮去除的比例为1∶1.387±0.024。对该工艺优化实验研究表明,适宜pH值为7.2～7.8,最适宜温度为35℃;且适度强化反硝化作用有利于提高反应器的脱氮性能。

Start-up of anaerobic ammonium oxidation process in anaerobic sequencing batch reactor

The cultivation of anaerobic ammonium oxidation sludge was studied with the anaerobic sequencing batch reactor seeded with aerobic nitrified sludge.Under the condition that the influent pH value ranged 7.2-7.8 and the temperature was 30 ± 1 ℃,the ANAMMOX sludge was successfully cultivated after 142 d.During the operation time,the sludge quantity(counted by VSS) in reactor increased from 9.90 g/L to 18.99 g/L,when the hydraulic retention time was 1.20 d and the volume loading of total nitrogen was 0.431 8 kg/(m3·d),the highest removal rate of total nitrogen,ammonia nitrogen,nitrite-nitrogen reached 93.3%,93.9% and 99.8% respectively,while,the average rate were 80.5%,81.2% and 85.7% respectively.The ratio of ammonia nitrogen and nitrite-nitrogen removal was 1 ∶ 1.387 ± 0.024.The results of the optimized experiment of the said process show that:the ANAMMOX reactor can reach a high performance with pH value ranged 7.2-7.8 at 35 ℃;and the modest intensity of denitrification was in favor of the improvement of the denitrification performance of the ANAMMOX reactor.