鸟粪石沉淀法用于养猪场污水前处理的影响因素研究

用鸟粪石沉淀法对养猪场污水进行前处理，研究了各类因素对沉淀效果的影响，包括加药剂与调节pH值的顺序、搅拌速率、温度、反应时间、溶液pH值与加入的药剂量等，其中溶液pH值与加入的药剂量是养猪场污水中污染物去除的决定性影响因素.本实验条件下，P/Mg/N比为1/1/1.2、pH10.0时，有最佳NH4+-N的去除率与最低PO43-P的残留浓度，分别是87%和30.21mg/L.

Optimizing Conditions for Struvite Precipitation as Pre-treatment of Swine Wastewater

This study developed a novel pre-treatment of swine wastewater through a stirring precipitation process of struvite formation that could trim down the pollutants loaded,and thus enhance the efficiency of further treatment.The major focus was on optimizing the quantitative factors influencing the struvite precipitation,e.g.,P/Mg/N ratio of chemicals,pH value,stirring speed,temperature,and reaction time.The pH and amount of chemicals being added in the wastewater were the key factors influencing the precipitation of struvite.Results of our experiment indicated that a P∶ Mg∶ N ratio of 1∶ 1∶ 1.2 and pH 10.0 were the optimal conditions.Under these conditions,the removal efficiency of NH+4-N was 87%;and it brought down residual PO3-4-P to the lowest concentration of 30.2 mg/L in the swine wastewater.