SBR脱氮系统污泥对磷的去除研究

为了研究缺氧(75 min)-好氧(294 min)交替运行的SBR系统中除磷的原因,采用静态实验,对比了不同碳源、水质及运行环境下对磷的去除情况。实验结果表明,该SBR脱氮系统中的好氧段磷的减少是生物去除的结果。当供给碳源为丙酸-乙酸混合物(摩尔比为2∶1)、葡萄糖、淀粉或蛋白胨时,污泥都可将磷去除,去除效率依次降低;COD/NO3--N为8.77∶1(400 mg/L∶45.6 mg/L)时除磷效果明显好于5.41∶1(400 mg/L∶73.9 mg/L)和3.57∶1(400 mg/L∶112 mg/L);进水磷浓度为8 mg/L时,COD由50 mg/L增加到400 mg/L,污泥对磷的去除效果基本一样;完全的缺氧或完全的好氧环境下,污泥对磷的去除能力逐渐丧失。

Phosphorus removal of sludge from a SBR with biological nitrogen removal

In order to investigate the phosphorus removal in a SBR operated with anoxic(75 min)and aerobic(294 min) cycle,batch tests with different carbon sources,different C/N ratios and C/P ratios as well as different operating modes were carried out.The results showed that the phosphorus removal of the sludge was a biological process.The best phosphorus removal was achieved when the mixture of propionic acid and acetic acid (mol ratio was 2 to 1) was supplied as carbon source,followed by glucose,starch,and peptone.Phosphorus removal efficiency with C/N ratio of 8.77:1(i.e.,400 mg/L to 45.6 mg/L) was higher than that of 5.41:1(i.e.,400 mg/L to 73.9 mg/L) and 3.57:1(i.e.,400 mg/L to 112 mg/L).When the concentration of phosphorus in the influent was 8 mg/L,the concentration of COD varied from 50 mg/L to 400 mg/L,had no effect on the phosphorus removal efficiency.The ability of phosphorus removal gradually disappeared under complete anoxic or aerobic condition without alternation.