UniFed SBR 工艺对生活污水除磷的研究

鉴于UniFed SBR工艺具有进水/排水/沉淀阶段同步进行、底部进水、顶部出水及反应器保持恒水位状态等特点,此工艺具有良好的生物除磷脱氮性能.本试验采用厌氧/缺氧/好氧交替运行的UniFed SBR反应器.考察了不同进水碳磷比ρ(C)/ρ(P)值、排水比、最大除磷负荷及曝气量对于系统生物除磷效果的影响.结果表明,对于不同进水ρ(C)/ρ(P)值,分别得到相应的释磷和吸磷速率,当ρ(C)/ρ(P)=23时,系统的出水磷质量浓度为0.89 kg/m~3,去除率为94.67%,当ρ(C)/ρ(P)>23时,可使出水磷质量浓度为零,说明此工艺独特的运行方式适用于低ρ(C)/ρ(P)值生活污水的深度除磷;当进水ρ(COD)成为释磷的限制因素时,随着排水比的增大,出水ρ(P)降低,但当进水ρ(COD)充足时,排水比对于磷的去除影响不大,均能保持较高的去除效率.该工艺独特的运行方式使其在实际操作中达到了很好的除磷效果,并为强化生物除磷提出了新思路和新方法.

Study of UniFed SBR Process for Biological Phosphorus Removal in Domestic Wastewater

UniFed SBR process has the unique feature which is the introduction of the influent into the settled sludge blanket during the settling and decant periods of the operation.It achieved suitable conditions for denitrification and anaerobic phosphorus release and also had high rate of nitrogen and phosphorus removal.In our experiment,this type of UniFed SBR process for treatment of domestic wastewater was used to study the effect ofρ(C)/ρ(P)ratio,decant ratio,maximal removal of phosphorus loading and aeration intensity on removal of phosphorus.Results show that whenρ(C)/ρ(P)ratio is 23,the removal efficiency of TP is 94.67 %.When the ratio ofρ(C)/ρ(P)is higher than 23,the concentration of phosphorus in the effluent is 0 kg/m~3.when the carbon source become the limiting factor to phosphorus release,the higher decant ratio is, the lower phosphorus concentration in the effluent is.When the carbon source is adequate,the system is proved to have a reliable performance in phosphorus removal.This system has great effect on phosphorus removal in domestic wastewater,which provides a new method to enhance biological phosphorus removal.