School of Forestry, Northeast Forestry University, Harbin 150040, China.
J Hazard Mater. 2010 Jun 15;178(1-3):1041-5. doi: 10.1016/j.jhazmat.2010.02.045. Epub 2010 Feb 18.
A sequencing batch reactor (SBR) with aerobic granular sludge was operated to determine the effect of different DO concentrations on biological nitrogen removal process and to investigate the spatial profiles of DO, ORP and pH as online control parameters in such systems. The results showed that DO concentration had a significant effect on nitrification efficiencies and the profiles of DO, ORP and pH. The specific nitrification rate was decreased from 0.0595 mgNH(4)(+)-N/(gMLSS min) to 0.0251 mgNH(4)(+)-N/(gMLSS min) after DO concentration was dropped off from 4.5mg/L to 1.0mg/L. High DO concentration improved the nitrification and increased the volumetric NH(4)(+)-N removal. Low DO concentration enhanced TIN removal, while prolonged the nitrification duration. Also there existed a good correlation between online control parameters (ORP, pH) and nutrient (COD, NH(4)(+)-N, NO(2)(-)-N, NO(3)(-)-N) variations in aerobic granular sludge reactor when DO was 2.5mg/L, 3.5mg/L and 4.5mg/L. However it was difficult to identify the end of nitrification and denitrification when DO was 1.0mg/L, due to no apparent bending points on ORP and pH curves. In conclusion, the optimal DO concentration was suggested at 2.5mg/L as it not only achieved high nitrogen removal efficiency and decreased the reaction duration, but also saved operation cost by aeration and mixing.
采用好氧颗粒污泥的序批式反应器（SBR）来确定不同 DO 浓度对生物脱氮过程的影响，并研究在线控制参数 DO、ORP 和 pH 的空间分布。结果表明，DO 浓度对硝化效率以及 DO、ORP 和 pH 的分布有显著影响。当 DO 浓度从 4.5mg/L 降至 1.0mg/L 时，比硝化速率从 0.0595mgNH(4)(+)-N/(gMLSS·min)降至 0.0251mgNH(4)(+)-N/(gMLSS·min)。高 DO 浓度提高了硝化作用并增加了容积 NH(4)(+)-N 去除率。低 DO 浓度增强了 TIN 的去除，同时延长了硝化作用的持续时间。当 DO 为 2.5mg/L、3.5mg/L 和 4.5mg/L 时，在线控制参数（ORP、pH）与好氧颗粒污泥反应器中营养物质（COD、NH(4)(+)-N、NO(2)(-)-N、NO(3)(-)-N）的变化之间存在良好的相关性。然而，当 DO 为 1.0mg/L 时，由于 ORP 和 pH 曲线没有明显的拐点，很难确定硝化和反硝化的终点。总之，建议 DO 浓度最佳为 2.5mg/L，因为它不仅实现了高氮去除效率并缩短了反应时间，而且通过曝气和搅拌还降低了运行成本。
