优化鸟粪石化学沉淀法对猪场废水处理研究(英文)

[目的]确定鸟粪石化学沉淀法对猪场废水的最佳优化工艺参数。[方法]采用中心复合实验设计和响应面分析法对鸟粪石化学沉淀去除猪场废水中氨氮的影响条件进行了优化分析和探讨。以体系pH、反应时间、Mg/N(摩尔比)和P/N(摩尔比)为考察因素,分别以猪场废水中氨氮去除率和残余PO43--P浓度为考察指标,选用最佳优化数学模型描述考察指标和考察因素之间的数学关系,并以设定氨氮去除率(75%)和残余PO43--P浓度(3.0mg/L)的目标值,通过等高线叠加图预测最优实验条件。[结果]当pH为10.0,搅拌时间为30min,Mg/N为1.11,N/P为1.14时,氨氮去除率可达最大值79.0%,体系中的残留PO43--P浓度为0.35mg/L。经对最优条件进行验证,预测值与验证实验平均值接近。[结论]中心复合实验设计和响应面分析法对鸟粪石化学沉淀处理猪场废水的工艺中,参数优化科学合理,快速有效。

Swine Wastewater Treatment with Struvite Precipitation Technology

[Objective] This study aimed to determine the optimal technical parameters for the swine wastewater treatment by struvite precipitation. [Method] Central composite design (CCD) and response surface method (RSM) were employed to study the effects of struvite precipitation on removing the ammonia nitrogen in the swine wastewater. Quadratic model was developed to describe the mathematical relationships between the investigated factors of pH value, reaction time, magnesium to nitrogen molar ratio (Mg/P), nitrogen to phosphorus molar ratio (N/P), the investigated indicators of NH 4 -N removal efficiency and residual PO 4 3 -P concentration. Contour overlay plot was proposed to predict the optimal experimental conditions with the NNH 4 -N removal efficiency of 75% and residual PO 4 3-P concentration of 3.0 mg/L as the desired values. [Result] At pH of 10.0, mixing time of 30 min, Mg/N of 1.11, N/P of 1.14, the NH 4 -N removal efficiency (Y 1 ) was the maximum of 79.0% , and the residual PO 4 3-P concentration (Y 2 ) at this time was 0.35 mg/L. The verification test of the optimal conditions proved that the verification data and model predictions agreed well. [Conclusion] The optimized parameters for the chemical struvite precipitation used to treat swine wastewater with central composite experimental design and response surface method are scientific, rational and efficient.