Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha 410083, China.
Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha 410083, China.
Bioresour Technol. 2015 Jun;185:134-42. doi: 10.1016/j.biortech.2015.02.091. Epub 2015 Feb 28.
The partial nitrification (PN) performance under high ammonium concentrations was evaluated in an airlift reactor (ALR). The ALR was operated for 253days with stepwise elevation of ammonium concentration to 1400mg/L corresponding nitrogen loading rate of 2.1kg/m(3)/d. The ammonium removal rate was finally developed to 2.0kg/m(3)/d with average removal efficiency above 91% and nitrite accumulation percentage of 80%. Results showed that the combined effect of limited DO, high bicarbonate, pH and free ammonia (FA) contributed to the stable nitrite accumulation substantially. The biomass in the ALR was improved with the inception of granulation. Precipitates on biomass surface was unexpectedly experienced which might improve the settleability of PN biomass. Organic functional groups attached to the PN biomass suggested the possible absorbability to different types of pollutant. The results provided important evidence for the possibility of applying an ALR to treat high strength ammonium wastewater.
在气升式反应器（ALR）中评估了高氨浓度下的部分硝化（PN）性能。ALR 运行了 253 天，逐步将氨浓度提高到 1400mg/L，相应的氮负荷为 2.1kg/m³/d。最终氨去除率达到 2.0kg/m³/d，平均去除效率高于 91%，亚硝酸盐积累率为 80%。结果表明，有限 DO、高碳酸氢盐、pH 值和游离氨（FA）的综合作用对稳定的亚硝酸盐积累有很大贡献。随着颗粒化的出现，ALR 中的生物量得到了改善。在生物量表面上意外地出现了沉淀物，这可能会提高 PN 生物量的沉降性能。附着在 PN 生物量上的有机官能团表明其对不同类型污染物的可能吸收性。这些结果为应用 ALR 处理高强度氨废水的可能性提供了重要证据。
