化学强化除磷对污水厂A^2/O工艺生物除磷的影响

Effect of Chemical Enhanced Phosphorus Removal on Biological Phosphorus Removal of A^2/O Process in Wastewater Treatment Plant

以西安市某污水处理厂的A^2/O工艺为研究对象,考察化学强化除磷对A^2/O工艺生物除磷的影响。结果表明,投加除磷剂后,出水TP浓度可达到地表水准Ⅳ类标准(TP≤0.3 mg/L),但与传统A^2/O工艺相比,污泥的释磷和吸磷活性以及聚磷菌占比均有所降低。化学除磷过程中生成的副产物对生物除磷有负面影响,表现为污泥种群结构发生变化,聚磷菌占比下降、聚糖菌占比上升。同时,剩余污泥中的Chem-P组分占比上升,占剩余污泥含磷量的10.61%。

The effect of chemical enhanced phosphorus removal on biological phosphorus removal of A^2/O process in a wastewater treatment plant in Xi’an was investigated.The effluent TP was less than 0.3 mg/L and could meet the level quasi Ⅳ criteria specified in the Environmental Quality Standards for Surface Water(GB 3838-2002)after adding phosphorus removal agent,but the phosphorus release and phosphorus uptake activities of the sludge and the proportion of phosphorus accumulating organisms(PAOs)all decreased compared with the traditional A^2/O process.By-products formed during the process of chemical phosphorus removal had a negative influence on the biological phosphorus removal,which was characterized by the change of sludge community structure,the decrease of the proportion of PAOs and the increase of the proportion of glycogen accumulating organisms(GAOs).At the same time,the chemical phosphorus in the excess sludge increased,accounting for 10.61% of the total phosphorus in excess sludge.