Abstract: Based on the experimental program of uniform design, PAC coagulation treatment for COD contained in industrial wastewater samples was studied. Effects of PAC dosage, pH and COD concentration of the sample on the COD removal rate (Y, % COD removal) and efficiency (Z, COD removed per PAC) were determined in 10 test runs for wastewater. Non-linear multi variable regression equations were defined to correlate Y and Z with the influencing factors. COD removal, Y and Z were correlated with pH, the best pH is 6~8. COD removal and Y are increased with COD concentration of the sample, the optimizing parameters was correlated with COD concentration of the sample. Z is decreased with the increase of PAC dosage. The optimum PAC dosage was determined by experiment in order to optimize the process conditions.

Key words: Waste water, Uniform design, COD, Nonlinear regression, Coagulation

摘要： 采用均匀设计法以PAC为絮凝剂处理炼厂废水，得到定量描述试验内在规律的多元非线性回归方程。考察了影响COD去除效果的主要因素。结果表明，在本试验条件下，COD去除量、去除率、去除效率均与pH值有关，pH值的最佳值在6～8之间。当pH值一定时，COD去除量、去除率存在最佳值|COD去除效率随着PAC投入量的增加而降低。

关键词: 均匀设计, 非线性回归, 炼厂废水, COD, PAC絮凝