Tang Li-Peng, Wei Qun-Shan, Lü Qiang, Zhang Chi, Liu Ya-Nan, Liu Jian-She
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China.
Huan Jing Ke Xue. 2019 Jan 8;40(1):318-326. doi: 10.13227/j.hjkx.201805094.
To improve the efficiency of the removal of dye wastewater, a new type of coagulant "polysilicate ferromanganese (PSFM)" has been synthesized using sodium silicate, ferrous sulfate, and potassium permanganate. Three dyes (direct red, disperse blue, and active yellow) were used for the coagulation tests. The effects of the alkalinity and turbidity on the performance of PSFM were studied. The experimental results show that PSFM performs well with respect to the coagulation of the direct red and disperse blue dyes. The color and TOC removal efficiencies reach 99.2%, 95.4% and 98.5%, and 93.8%, respectively. The coagulation performance is better than that of the conventional coagulants polysilicate iron (PSF), Al(SO), and FeCl. The color and TOC removal rates of PSFM for the active yellow dye reach 56% and 51%, respectively. Turbidity has no significant effect on the coagulation efficiency of PSFM. The purification efficiency and alkalinity depend on the amount of dye to be removed. The best alkalinity for the direct red, disperse blue, and active yellow dyes is 50 mg·L, 0 mg·L, and 75 mg·L, respectively. In addition, PSFM has been characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The Zeta potentials of the mixed solutions and flocs during coagulation were also determined. The main indicators of PSFM coagulation are positively charged polynuclear complexes produced by hydrolysis of Fe and Mn and the bridging polymerization of polysilicon. The adsorption of hydrated manganese dioxide and hydroxyl oxide may also be included.
为提高染料废水的去除效率，采用硅酸钠、硫酸亚铁和高锰酸钾合成了一种新型混凝剂“聚硅酸铁锰（PSFM）”。使用三种染料（直接红、分散蓝和活性黄）进行混凝试验。研究了碱度和浊度对PSFM性能的影响。实验结果表明，PSFM对直接红和分散蓝染料的混凝效果良好。颜色和TOC去除效率分别达到99.2%、95.4%和98.5%、93.8%。其混凝性能优于传统混凝剂聚硅酸铁（PSF）、Al(SO)和FeCl。PSFM对活性黄染料的颜色和TOC去除率分别达到56%和51%。浊度对PSFM的混凝效率无显著影响。净化效率和碱度取决于待去除染料的量。直接红、分散蓝和活性黄染料的最佳碱度分别为50 mg·L、0 mg·L和75 mg·L。此外，通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）对PSFM进行了表征。还测定了混凝过程中混合溶液和絮体的Zeta电位。PSFM混凝的主要指标是由Fe和Mn水解产生的带正电的多核络合物以及多晶硅的架桥聚合。还可能包括水合二氧化锰和羟基氧化物的吸附。
