好氧颗粒污泥处理高浓度氨氮废水的研究

Treatment of wastewater with a high NH^+_4-N concentration by aerobic granular sludge

在不同接种源污泥颗粒化过程中污泥理化性状对比研究的基础上,采用成熟好氧颗粒污泥处理高浓度氨氮废水,对其脱氮行为以及不同C/N条件下好氧颗粒污泥微生物的比耗氧速率、好氧颗粒污泥对氨氮的比降解速率随时间的变化等进行了研究。实验结果表明,在进水氨氮质量浓度较高(480mg/L)、温度30℃左右的条件下,稳定运行15d,氨氮的去除率维持在85%左右;进水氨氮的浓度越高,随着微生物对环境的逐渐适应,硝化菌的活性也逐步增加;随着进水氨氮浓度的提高,好氧颗粒污泥对氨氮的比降解速率也逐渐上升。

Physicochemical characteristics of aerobic-and anaerobic-originated sludge samples in various stages of aerobic granulation were observed and compared ; the differences between the two sludge types gradually disappeared. Fully developed aerobic granular sludge was then employed for treating a wastewater of high NH4^＋-N concentration. Studies were performed to obtain nitrification rates and specific oxygen utilization rates （SOUR） of the responsible bacteria at different C/N ratios. With a feed NH4^＋-N concentration of 120 mg/L, the steady state removal was 95% at a higher feed concentration of 480 mg/L, the removal rate dropped to 85%. A lower C/N ratio resulted in a higher SOUR of the nitrifying bacteria. As the ammonia concentration in the feed increased, the bacteria became more active, and the nitrification rates increased as a result. Since total nitrogen in the effluent was much lower than that in the feed, denitrification presumably took place in anaerobic section of the granular sludge subject to the availability of organic substrate.