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.

　　在廢水中加入硫酸亞鐵進行電解，產生大量帶正電荷的亞鐵離子，使污染物膠體表面越來越多的電荷被中和，離子與水中帶正電荷和負電荷的膠體粒子進行交換。，具有主要吸引力的膠體顆粒形成絮凝沉淀。

　　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.

　　硫酸鐵在廢水中凝固的過程中，一部分二價亞鐵離子水解氧化成三價鐵離子。生成多核絡合物離子化合物，在布朗運動和攪動的作用下，吸附并清掃水體中殘留的磷酸鹽等污染物，形成巨大的黏附明礬花沉淀。3價鐵離子與各種金屬鹽反應形成的氫氧明礬密度大，沉降速度快，沉淀污泥密度大，處理方便。

　　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.

　　硫酸亞鐵的絮凝效果

　　Flocculation effect of ferrous sulfate

　　硫酸亞鐵是許多無機化學混凝劑之一。廣泛應用于印染廢水、造紙廢水、電鍍廢水等色度高、總磷高的處理，因硫酸亞鐵脫色、除磷、混凝效果好。而且鈦白粉的副產品成本很低(約200/噸)。目前，隨著廢水排放標準的提高，硫酸亞鐵作為芬頓試劑在造紙廢水處理中得到了廣泛的應用。

　　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.

　　硫酸亞鐵混凝除磷除色效果好外，對六價鉻、鋅等廢水中硫酸亞鐵的絮凝原理也有很好的處理效果。干燥硫酸亞鐵的應用完全可以替代生化芬頓法處理制藥廢水的COD。由于其PH值適應性范圍高于普通七水硫酸亞鐵。

　　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.

　　硫酸亞鐵用于廢水處理

　　Ferrous sulfate used in wastewater treatment

　　隨著環境污染的日益嚴重，工業廢水對環境的污染越來越受到人們的重視。因此，廢水在排放前需要進行處理，然后有很多方法對廢水進行處理，經濟有效的方法是采用化學混凝處理，在廢水中加入混凝劑達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.

　　廢水經過化學處理。以硫酸亞鐵為例，硫酸亞鐵由于是二氧化鈦的副產品，水處理效果好，成本低，在廢水處理中廣泛應用。硫酸亞鐵的作用是一種膠體粒子，有機物，微生物在水中使廢水懸浮的物質具有很強的吸附橋接和電中和作用，使它們沉淀在水中，其對水的影響。

　　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.