城镇污水高速率短程硝化厌氧氨氧化脱氮

High-rate Nitrogen Removal from Urban Wastewater Using Nitritation and Anaerobic Ammonium Oxidation

为了推动城镇污水低碳高效脱氮,提出了一种双区序批式短程硝化厌氧氨氧化脱氮技术。通过设置底部厌氧氨氧化颗粒污泥区和上部絮体污泥短程硝化区,实现了高速率脱氮。在进水无有机物、氨氮浓度为58.18 mg/L以及水力停留时间为1.66 h的情况下,容积氮去除速率高达675 mg/(L·d),出水总氮浓度为13.19 mg/L。宏基因组分析结果表明,絮体污泥中氨氧化菌相对丰度为14.70%,而氨氧化菌与亚硝酸盐氧化菌相对丰度之比为10.77,亚硝态氮积累率为81%。颗粒污泥中厌氧氨氧化菌相对丰度为23.22%,总氮去除速率为7.53 mg/(gMLSS·h)。该技术脱氮速率高、占地面积小,有望为用地紧张的城镇中心污水处理厂减污降碳升级改造提供新的技术选择。

To promote low-carbon and efficient nitrogen removal from urban wastewater,a twozone sequential batch nitritation and Anammox technology was proposed.By establishing a bottom Anammox granular sludge zone and an upper floc sludge nitritation zone,high-rate nitrogen removal was achieved.Under the conditions of no organic matter in the influent,ammonia nitrogen concentration of 58.18 mg/L,and hydraulic retention time of 1.66 hours,the nitrogen removal rate reached 675 mg/(L·d),with an effluent total nitrogen concentration of 13.19 mg/L.Metagenomic results indicated that the relative abundance of ammonia-oxidizing bacteria(AOB)in the floc sludge was 14.70%,while the abundance ratio of AOB to nitrite-oxidizing bacteria(NOB)was 10.77,with a nitrite accumulation rate(NAR)of 81%.The relative abundance of Anammox bacteria in the granular sludge was 23.22%,and the total nitrogen removal rate was 7.53 mg/(gMLSS·h).This technology,with its high nitrogen removal rate and small footprint,is expected to provide a new technical option for reducing pollution and carbon emission in upgrade of wastewater treatment plants in urban centers with limited land availability.