Plackett-Burman法筛选污水中总氮去除的主要影响因素

Application of Plackett-Burman Design for Determining Key Factors of Total Nitrogen Removal from Wastewater

结合生产实际运行数据,分析了南方某污水处理厂二级处理段(A2O工艺和氧化沟工艺)和深度处理段(微絮凝过滤工艺和次氯酸钠消毒工艺)等处理单元对总氮的去除效果。采用基于蒙特卡罗(Monte-Carlo)模拟的概率统计方法对该厂再生水中总氮符合相应标准的概率(保障率)进行了定量计算。结果表明,当再生水作为城市绿化用水和景观环境用水时,总氮保障率均仅为1.59%,存在较大的安全风险。在满足污水处理厂实际运行可控条件下,采用Plackett-Burman试验设计对全流程污水处理工艺中影响总氮去除效果的可控因素进行了研究,建立了合适且具有代表性的数学回归模型方程,筛选出了主要控制因子:混合液回流比、生物池出水PAC投加量和过滤池次氯酸钠投加量,为进一步优化工艺参数提供了重要理论依据和实践基础。

Connecting with the operation data of production practice, the removal effect of total nitrogen at both secondary treatment units （A2O process and oxidation ditch process） and in-depth treatment units （micro flocculation filtering process and disinfection process） of the WWPT was analyzed. The probability of total nitrogen in reclaimed water of the WWPT quantitatively which complied with the relevant standards was calculated by the probability and statistics method based on Monte Carlo simulation. The reasult showed,for the total nitrogen existed in bigger security risk when the reclaimed water were used as urban greening water and landscape environment water, its qualification being only 1.59%. On the Actual operation controlled condition of the WWPT, the factors that influenced total nitrogen removal efficiency in the flow process were studied by Plackett-Burman design, the appropriate and typical mathematical regression model equation was established and the main control factors were screened, including internal return ratio PAC dosage of outflow from biological tank and NaClO dosage of filter tank, which provided the important theoretical basis and practical basis for the further optimization of process parameters.