The flocculation process of ferrous sulfate in wastewater is the process of electroneutralization and adsorption of soluble pollutants into sludge after hydrolysis. The coagulation of ferrous sulfate can be divided into two parts, one is used for chemical flocculation (such as adsorption bridging, hydride generation alum), the other is used for physical flocculation (such as double electric layer compression, colloidal electric neutralization). When the hydrolysis reaction of ferrous sulfate causes the colloidal substance to produce different potential ions in water, it will lose stability and generate bonding reaction, which makes the small particles of colloidal pollutants become colloidal particles and alum flower precipitation.

　　在废水中加入硫酸亚铁进行电解，产生大量带正电荷的亚铁离子，使污染物胶体表面越来越多的电荷被中和，离子与水中带正电荷和负电荷的胶体粒子进行交换。，具有主要吸引力的胶体颗粒形成絮凝沉淀。

　　Adding ferrous sulfate to the wastewater for electrolysis produces a large number of positively charged ferrous ions, which neutralizes more and more charges on the surface of the pollutant colloid, and the ions exchange with positively and negatively charged colloidal particles in the water. Finally, the main attractive colloidal particles form flocculation and sedimentation.

　　硫酸铁在废水中凝固的过程中，一部分二价亚铁离子水解氧化成三价铁离子。生成多核络合物离子化合物，在布朗运动和搅动的作用下，吸附并清扫水体中残留的磷酸盐等污染物，形成巨大的黏附明矾花沉淀。3价铁离子与各种金属盐反应形成的氢氧明矾密度大，沉降速度快，沉淀污泥密度大，处理方便。

　　During the solidification process of ferric sulfate in wastewater, a part of divalent ferrous ions are hydrolyzed and oxidized to trivalent iron ions. Under the action of Brownian motion and agitation, it adsorbs and cleans the residual phosphate and other pollutants in the water and forms a huge alum flower deposit. The density of oxyhydrogen alum formed by the reaction of Fe3 + with various metal salts is large, the settling speed is fast, the density of precipitated sludge is large, and the treatment is convenient.

　　硫酸亚铁的絮凝效果

　　Flocculation effect of ferrous sulfate

　　硫酸亚铁是许多无机化学混凝剂之一。广泛应用于印染废水、造纸废水、电镀废水等色度高、总磷高的处理，因硫酸亚铁脱色、除磷、混凝效果好。而且钛白粉的副产品成本很低(约200/吨)。目前，随着废水排放标准的提高，硫酸亚铁作为芬顿试剂在造纸废水处理中得到了广泛的应用。

　　Ferrous sulfate is one of many inorganic chemical coagulants. It is widely used in the treatment of printing and dyeing wastewater, papermaking wastewater, electroplating wastewater and other wastewater with high chroma and total phosphorus, due to the good effect of ferrous sulfate decolorization, phosphorus removal and coagulation. Moreover, the by-product cost of titanium dioxide is very low (about 200 / ton). At present, with the improvement of wastewater discharge standard, ferrous sulfate as Fenton reagent has been widely used in papermaking wastewater treatment.

　　硫酸亚铁混凝除磷除色效果好外，对六价铬、锌等废水中硫酸亚铁的絮凝原理也有很好的处理效果。干燥硫酸亚铁的应用完全可以替代生化芬顿法处理制药废水的COD。由于其PH值适应性范围高于普通七水硫酸亚铁。

　　In addition to its good color removal effect, ferrous sulfate coagulation has a good treatment effect on the flocculation principle of ferrous sulfate in wastewater such as hexavalent chromium and zinc. The application of dry ferrous sulfate can completely replace the biochemical Fenton process in the treatment of COD in pharmaceutical wastewater. Because its pH value adaptability range is higher than the ordinary ferrous sulfate heptahydrate.

　　硫酸亚铁用于废水处理

　　Ferrous sulfate used in wastewater treatment

　　随着环境污染的日益严重，工业废水对环境的污染越来越受到人们的重视。因此，废水在排放前需要进行处理，然后有很多方法对废水进行处理，经济有效的方法是采用化学混凝处理，在废水中加入混凝剂达到去除污染物的目的。

　　With the increasingly serious environmental pollution, people pay more and more attention to the environmental pollution of industrial wastewater. Therefore, the wastewater needs to be treated before discharge, and then there are many ways to treat the wastewater. The most economical and effective way is to use chemical coagulation treatment, adding coagulant in the wastewater to achieve the purpose of removing pollutants.

　　废水经过化学处理。以硫酸亚铁为例，硫酸亚铁由于是二氧化钛的副产品，水处理效果好，成本低，在废水处理中广泛应用。硫酸亚铁的作用是一种胶体粒子，有机物，微生物在水中使废水悬浮的物质具有很强的吸附桥接和电中和作用，使它们沉淀在水中，其对水的影响。

　　The waste water is chemically treated. Taking ferrous sulfate as an example, ferrous sulfate is widely used in wastewater treatment because it is a by-product of titanium dioxide with good water treatment effect and low cost. The function of ferrous sulfate is a kind of colloidal particle, organic matter, microorganism in the water, which makes the suspended matter of wastewater have strong adsorption bridging and electric neutralization, make them settle in the water, and eliminate its influence on the water.