单纯形优化法在混凝除磷试验中的应用研究

以天津市纪庄子污水厂二级出水作为研究对象,利用单纯形优化方法,探讨不同混凝剂优化混凝除磷的最优条件。本实验对两种混凝剂硫酸铁、硫酸铝的混凝除磷效果进行了研究,利用单纯形优化方法对两种混凝剂的主要影响因素(混凝剂投加量和pH)进行了优化,从而得出了两种混凝剂去除二级出水中磷的最优条件。结果表明:通过18～25次实验,单纯形即可确定两种混凝剂除磷的最优条件。每种混凝剂的去除率都至少增加了30%。硫酸铁、硫酸铝两种混凝剂对总磷的最大去除率分别为87.25%,95.60%。每种混凝剂对正磷酸盐的去除率大于总磷的去除率。硫酸铁、硫酸铝两种混凝剂除磷的总磷残余浓度分别为0.35 mg.L-1,0.12 mg.L-1,达到0.5 mg.L-1以下的城市污水再生利用景观环境用水水质标准(GB/T18921-2002)。

Application of Simplex Optimization for Coagulation Phosphorus Removal

Based on the secondary effluent of Jizhuangzi sewage treatment plant in Tianjin,the application of simplex optimization for coagulation phosphorus removal was studied.The coagulants studied were ferric sulfate Fe2(SO4)3] and aluminum sulfate Al2(SO4)3·18H2O].For each coagulant examined,18～25 experiments were carried out until a maximum removal was observed through the experimental procession.Increases of higher than 30% were found for the removal efficiencies of these two coagulants over the course of the experiments.The maximum removal efficiencies were 87.25% for ferric sulfate;95.60% for aluminum sulfate were obtained through the simplex procession.The orthophosphate removal efficiency was higher than that of total phosphorus for each coagulant.The minimum total phosphorus residuals were 0.35 mg·L-1 and 0.12 mg·L-1,which were accordant with GB/T18921-2002.