Demonstrate the difference between the effect of polyaluminium chloride and ferrous sulphate in water treatment Differentiate the effect of polyaluminum chloride and ferrous sulphate in water treatment Difference Polyaluminum chloride and ferrous sulfate act as coagulant in wastewater treatment Flocculant. Ferrous sulfate has the advantage of rapid settling velocity, large sludge particles after treatment, and good decoloring effect. It is commonly used in decolorization of printing and dyeing wastewater and has very low cost. Polyaluminum chloride has the advantages of fast settling velocity, wide range of PH value for waste water body, low corrosivity to water treatment equipment pipeline, good phosphorus removal effect and the like. Through experiments we compare the effect of PAC and ferrous sulfate as coagulants in water treatment: 1, for the treatment of drinking water, the agents currently used mainly rely on PAC or PFS Treatment, ferrous sulfate at present due to some of its indicators are not standard temporarily can not be applied in drinking water treatment. However, the performance of polyferric sulfate in drinking water is better than that of polyaluminum chloride, and the iron salt is gradually replacing the market of aluminum salt. 2, Through experiments, we can find that the effect of polyaluminium chloride and ferrous sulfate will be affected by the hydraulic conditions. If the hydraulic conditions are the same, both ferrous sulfate and polyaluminum can rapidly form alum and form a precipitate, Ferrous sulfate formed smaller alum, polyaluminium chloride formed relatively larger alum. 3. In the case of low temperature, the coagulation effect of the filter aluminum polypharide will not be affected. The reaction of ferrous sulfate is an endothermic process, so it will be affected by the low temperature and thus it will be difficult to form flocs. 4, for the PH value of the wastewater to adapt to the scope of PAC wastewater treatment PH value range of 5-9. Ferrous sulfate wastewater PH value range of 6-8. It can be seen above the PH value to adapt Polymeric aluminum is slightly better than ferrous sulfate. 5. For the flocs formed by the hydrolysis polymerization of the filter polyaluminum chloride in waste water are network-shaped and have large specific surface area, they have strong adsorption and removal of iron, fluorine, arsenic, bacteria and phosphorus in water Role, while the use of relatively stable effect. Ferrous sulfate generated by the polymerization of small flocs, small area, the water of copper, zinc and other heavy metal ions removal effect is significant, and the phosphorus removal effect is quite. And accompanied by a strong decolorization effect. 6, polyaluminum chloride alkalinity, soluble in water, easy to use, quality and stability. Ferrous sulfate is an iron salt that is less harmful to aluminum. The most important point is that the treatment cost of ferrous sulfate is one-third of the cost of PAC treatment. However, both types of pharmaceutical wastewater treatment need to use other coagulant to achieve better treatment (such as polypropylene, lime, etc.). Source of the official website: http: //www.gyzhenyu.com/