硝酸盐浓度及投加方式对反硝化除磷的影响

采用SBR反应器，详细研究了硝酸盐浓度及其投加方式对反硝化除磷过程的影响。结果表明，缺氧环境下的反硝化吸磷速率与作为电子受体的硝酸盐浓度有很大的关系，硝酸盐浓度越高．吸磷速率越快。当硝酸盐浓度较低．不足以氧化反硝化聚磷菌细胞内的PHB从而导致体系反硝化除磷效率的下降。相同浓度的硝酸盐，采用流加的方式可以获得比一次性投加更高的反硝化吸磷速率。缺氧环境下，反硝化脱氮量与磷的吸收量成良好的线性关系．借助于反硝化聚磷菌，反硝化脱氮与除磷可在一种环境中完成，有效解决了废水中COD不足的问题．同时达到了节省能源和降低污泥产量的目的。

Effect of nitrate on denitrifying dephosphatation

The effect of nitrate on denitrifying dephosphatation was investigated by using a laboratory-scale Sequencing Batch Reactor (SBR). The results showed that the rate of taking up phosphate in anoxic condition was rela ted to the concentration of nitrate. The higher concentration of nitrate was , the higher rate of taking up phosphate was obtained. When the concentration of nitrate was limit factor in reactor, the PHB stored in the cell of denitrifying phosphorus removal bacteria could not be oxidized fully, which led the decrease of efficiency of phosphate removal. The continuous and steady addition of nitra te could obtain the higher rate of taking up phosphate than the nitrate was adde d once. There was a linear relationship between the nitrogen removal and phospha te taken up under anoxic condition. Based on the activity of denitrifying phosph orus removal bacteria, the anoxic phosphate removal occurs simultaneously with d enitrification under same condition so that the organic substrate and energy cou ld be saved and the aim of reducing sludge production could be obtained.