碳源种类对生活污水磷酸盐生物还原系统磷形态转化的影响

Effect of carbon sources on phosphorus forms' transformation of phosphate reduction system in domestic sewage

研究考察了碳源种类葡萄糖、甲醇、乙酸钠、淀粉对磷酸盐生物还原系统除磷效能及磷形态转化的影响。试验结果表明,碳源种类对磷酸盐生物还原系统除磷效能有影响,以葡萄糖为碳源,系统每天外源磷的去除量42.05mg,明显高于其他3种碳源;以葡萄糖为碳源时,系统污泥中无机磷(Inorg-P)主体成分铁铝结合态磷(NaOH-P)和可还原水溶性磷(BD-P)的转化量较高,为每克干污泥1.67mg,后续惰性磷(NaOH85-P)转化量较高,整个磷转化过程向着磷酸盐还原菌可利用活性磷发展;以淀粉为碳源时,系统污泥中有机磷(Org-P)转化量最低为每克干污泥2.86mg,成为整个磷转化过程的限制性步骤;以甲醇和乙酸钠为碳源时,系统污泥中NaOH85-P转化量较低,BD-P难以转化,成为整个磷转化过程的限制性步骤。

The influence of glucose,methanol,sodium acetate and starch on phosphorus removal performance and conversion of phosphorus transformation is studied.The results show that 42.05 mg per day of external phosphorus is removed in the systems using glucose as carbon source and it is significantly better than the other three carbon sources.When glucose is used as carbon source,NaOH-P and BD-P which are main ingredients of Inorg-P in system sludge transform 1.67 mg per gram dry sludge,and conversion capacity of NaOH85-P is relatively higher.The whole phosphorus transformation process goes toward reactive phosphorus which can be used by phosphorus reducing bacteria.When starch is used as carbon source,conversion capacity of Org-P in sludge is lowest for 2.86 mg per gram dry sludge,which is the restrictive process of entire phosphorus transformation.When starch is used as methanol,sodium acetate,conversion capacity of NaOH85-P in sludge is relatively low and BD-P is difficult to transform,which is the restrictive step of entire phosphorus transformation.