剩余污泥水解酸化液磷去除的影响因素研究

Factors influencing phosphorus removal from centrifugate of acidified excess activated sludge

城市污水厂剩余污泥水解酸化后可产生高浓度挥发性有机酸(VFAs),其中的乙酸和丙酸是增强生物除磷(EBPR)工艺的有利基质。但水解酸化液中含有大量的磷,如不进行处理就作为碳源回用到污水处理工艺中,势必增加除磷负荷。利用鸟粪石沉淀法可以去除污水中的磷。对城市污水厂剩余污泥水解酸化液形成鸟粪石的影响因素进行了试验研究。结果表明,在最佳工艺条件下,正磷和总磷的去除率分别可达92.5%和83.8%。

Excess activated sludge can yield volatile fatty acid （VFAs） with high concentration after hydrolysis and acidification. Both acetate and propionate in VFAs are the most suitable carbon substrates for enhanced biological phosphorus removal （EBPR） , but there is large amount of phosphorus in the centrifugate of acidified excess activated sludge. Without phosphorus removal, it would increase the loading of the wastewater treatment plant when it recycles to the front of the plant as carbon substrate. Phosphorus can be removed by struvite formation. This paper investigated the influence factors of phosphorus removal from centrifugate of acidified excess activated sludge. The result showed that the removal rates of ortho-phosphorus and total phosphorus were 92.5% and 83.8% , respectively, under the optimal conditions.