间歇曝气对部分硝化-厌氧氨氧化处理氨氮废水的影响

采用间歇曝气在MBBR反应器中成功实现一段式部分硝化耦合厌氧氨氧化(PN/A)过程.结果表明,在实验温度为35℃,进水氨氮浓度为150.00mg/L,进水氮负荷为0.24kg/(m3·d),DO浓度为(1.41±0.24)mg/L条件下,反应器总氮去除效率达到83.74％.生物膜中厌氧氨氧化菌(AnAOB)和氨氧化菌(...

Partial nitrification-anaerobic ammonia oxidation for the treatment of moderately concentrated ammonia-nitrogen wastewater: Effect of intermittent aeration on nitrogen removal performance

A one-stage PN/A(partial nitrification coupled with anaerobic ammonia oxidation) process was successfully implemented using a lab-scale MBBR reactor with the intermittent aeration. The total nitrogen removal efficiency reached 83.74% under the condition of 35℃, 150.00 mg/L influent ammonia nitrogen, 0.24 kg/(m³·d) influent nitrogen loading rate and(1.41±0.24)mg/L DO concentration. The maximum activity of anaerobic ammonia oxidizing bacteria(AnAOB) and ammonia oxidizing bacteria(AOB) in biofilms were 3792.00 and 5166.00 mg/(m²·d), respectively, while nitrite oxidizing bacteria(NOB) activity was not detected. The results of high throughput analysis showed that the AnAOB was mainly Candidatus Brocadia with a relative abundance of 1.33%,and the dominated AOB and NOB were Nitrosomonas at 0.17% relative abundance and Nitrospira at 0.003% relative abundance,respectively. The efficient PN/A process could be achieved in MBBR reactors at moderate ammonia-nitrogen concentration, and the augmentation of DO concentrations by the intermittent aeration could effectively improve the nitrogen removal performance.