电子受体和MLSS对反硝化除磷的影响

摘要

The effects of electron acceptor and MLSS on denitrifying phosphorus removal were investigated by sequencing batch reactor. The results indicate that increment of nitrate concentrations is beneficial to phosphorus removal. However,when nitrate concentration is more than 40 mg/L,nitrogen removal efficiency decreases,which has a negative effect on phosphorus release for the next cycle. Under low concentration of nitrate (e. g. 5 mg/L),denitrifying phosphorus removal sludge can still uptake a small amount of phosphorus. But if nitrite concentration is above 20 mg/L,nitrogen removal is inhibited significantly. Phosphorus release amounts under anaerobic condition and phosphorus uptake amounts under anoxia condition increases with the increase of MLSS. Unit MLSS phosphorus release amount and unit MLSS phosphorus uptake amount decrease with the increase of MLSS. When MLSS is more than 11. 3 g/L,MLSS increment has no influence on phosphorus release amount under anaerobic condition and phosphorus uptake amounts under anoxia condition.%采用序批式活性污泥法进行污水处理试验，考察电子受体的浓度和种类、MLSS对反硝化聚磷污泥脱氮除磷效果的影响。结果表明硝酸盐浓度的提高有利于除磷，但过高的硝酸盐浓度（40 mg/L），会导致脱氮效果降低，进而影响下一周期的厌氧释磷效果；在较低的亚硝酸盐浓度下（5 mg/L），有少量摄磷；当亚硝酸盐浓度大于20 mg/L时，对反硝化除磷有明显的抑制作用；随着MLSS增加，厌氧释磷量和缺氧摄磷量均增加；单位MLSS释磷量和单位MLSS摄磷量均与MLSS变化趋势相反；当MLSS大于11．3 g/L时，MLSS的增加对厌氧释磷量和缺氧摄磷量影响不大。