化学铁盐辅助除磷对生物除磷的影响研究

化学辅助除磷有助于污水厂实现磷达标,但其对生物系统存在潜在的影响。针对除磷药剂对生物除磷过程的影响展开研究,选用硫酸亚铁进行化学辅助除磷。药剂形成的化学污泥干扰生物除磷过程且成分复杂,故以磷酸铁、氢氧化铁模拟化学污泥,由钾离子、K/P摩尔比计算出同步除磷中的生物除磷,来探讨化学污泥对聚磷菌释磷/吸磷过程的影响。结果表明,连续投加硫酸亚铁使聚磷菌的释磷量、吸磷量降低;系统中磷酸铁含量0.075 mmol/L时聚磷菌的释磷和吸磷能力提高了约25%,磷酸铁含量0.15 mmol/L时对聚磷菌吸磷有抑制作用;氢氧化铁对聚磷菌释磷、好氧初期吸磷均有抑制作用。生物污泥与化学污泥存在交互作用。

Effect of Chemical Addition on Biological Phosphorus Removal System

Biological phosphorus removal which is assisted by chemical dose has potential impact on phosphorus accumulating organism.The simultaneous phosphorus removal was done to treat domestic wastewater in the college by adding ferrous sulphate.Considering confused constituent of phosphorus precipitation which interferes with biological phosphorus analysis,chemically pure ferric phosphate and ferric hydroxide were chosen to represent phosphorus precipitation.Phosphorus removal by PAO was calculated according to potassium and mol ratio of K/P in order to evaluate the effect of chemical dose on biological phosphorus removal.Results showed that continuous addition of FeSO 4 resulted in decrease of phosphorus release and adsorption by PAO.Ferric phosphate of 0.075 mmol/L stimulated the phosphorus release and adsorption of PAO by 25%,while ferric phosphate of 0.15 mmol/L had inhibition on phosphorus release.Phosphorus release and initial adsorption by PAO were inhibited by ferric hydroxide.There was interaction between biological sludge and chemical sludge.