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采用FeSO4·7H2O、Fe2(SO4)3、FeCl3·6H2O、聚硫酸铁4种不同铁源优化制备聚硅酸铁混凝剂(PSF),考察深度处理腈纶废水的效果。实验证明,FeSO4·7H2O为最佳铁源,以FeSO4·7H2O为铁源制备的PSF(FeSO4·7H2O)凝胶时间长、浊度去除率和化学需氧量(COD)去除率高,并且成本最低。当铁硅比1.5、反应体系pH在4.24~7.32之间时,PSF(FeSO4·7H2O)处理腈纶废水效果达到最优:浊度去除率为98.56%左右、COD去除率为38.21%左右。处理后水达到《污水综合排放标准》(GB 8978-1996)修改单规定的腈纶废水一级出水标准。利用三维荧光研究处理前后水样,各荧光峰荧光强度均有不同程度的减弱,分析荧光光谱特性发现:PSF可以有效深度处理腈纶废水中微生物降解产物及表面活性剂等难以生物降解的部分。
Polysilicate ferric coagulant (PSF) was optimized by using four different iron sources, FeSO4 · 7H2O, Fe2 (SO4) 3, FeCl3 · 6H2O and polyferric sulfate, and the effects of advanced treatment of acrylic wastewater were investigated. Experiments show that FeSO4 · 7H2O is the best iron source, PSF (FeSO4 · 7H2O) gel prepared with FeSO4 · 7H2O as iron source has a long time, high turbidity removal rate and high COD removal rate, and the cost lowest. When the Fe / Si ratio is 1.5, the pH value of the reaction system is between 4.24 and 7.32, the effect of PSF (FeSO4 · 7H2O) on the treatment of acrylic fiber wastewater is optimal: turbidity removal rate is about 98.56% and COD removal rate is about 38.21%. The treated water reaches the primary effluent standard of acrylic fiber wastewater as stipulated in the “Integrated Wastewater Discharge Standard” (GB 8978-1996). Fluorescence spectra showed that PSF could effectively treat the biodegradable products, such as microbial degradation products and surfactants, in the wastewater of acrylic fiber wastewater before and after treated with three-dimensional fluorescence.