碳氮比对分段进水生物脱氮的影响

探讨了6组不同的碳氮比(C/N)对分段进水生物脱氮工艺中进水流量分配、每一段中缺氧区好氧区容积比以及脱氮效率的影响.将进水总氮浓度恒定为42mg/L(凯氏氮浓度为40mg/L),以比较出水总氮浓度.结果表明,在一定C/N条件下,通过调整进水流量分配和每一段缺氧区与好氧区容积比可达到高于95%的总氮去除率.同时污泥体积指数也会随着进水流量分配系数的升高而增大.出水总氮浓度主要是由进水流量分配所决定,每一段中缺氧区好氧区的容积比影响不大.

Influence of C/N ratio on the biological nitrogen removal in step feed process

The 6 groups of different C/N on the influent flow distribution in the step feed biological nitrogen removal technology, as well as the influence of nitrogen removal efficiency and volume ratio of anoxic zone and aerobic zone in each section were explored; in which the influent total nitrogen concentration was stabilized at 42mg/L (kjldahl nitrogen concentration was 40mg/L) to compare the effluent total nitrogen concentration. The total nitrogen removal rate could reach higher than 95%, under certain C/N condition, through adjusting the influent flow distribution and the volume ratio of anoxic and aerobic zone in each section. Meanwhile, the sludge volume index would also increase with the increasing of influent flow distribution coefficient. Under certain C/N condition, the effluent total nitrogen concentration was decided mainly by the influent flow distribution. The influence of volume ratio in anoxic and aerobic zones of each section was not great.