Polyferric sulfate is a powerful inorganic water treatment agent, which has the advantages of strong cohesion, coarse and compact floccule, fast sedimentation speed and wide pH range. Compared with other flocculants, polyferric sulfate has the advantages of less dosage, high efficiency, low cost and low toxicity. The main types of wastewater that can be treated by polyferric sulfate are as follows:

1. Treatment of printing and dyeing wastewater

Printing and dyeing industrial wastewater is difficult to meet the discharge requirements only by biochemical treatment due to the complex sources of raw materials, dyes, auxiliaries and so on. The experimental results show that PFS has a remarkable effect on the treatment of various kinds of wastewater from printing and dyeing industry, especially for the removal rate of COD value of disperse dyes, sulfide dyes, direct dyes, etc. it has the functions of decolorization, deodorization and deodorization. The results show that PFS can replace ferrous sulfate, polyaluminum and other inorganic flocculants in the treatment of printing and dyeing wastewater.

2. Treatment of synthetic detergent wastewater

The wastewater from synthetic washing plant mainly contains sodium alkylbenzene sulfonate, oil (alkylbenzene, chlorinated petroleum, etc.), acid, alkali and inorganic salt (such as sodium hydroxide, cyanide, phosphate, etc.). The results show that the COD removal rate of PFS reaches 90-92%, while the removal rates of other flocculants are below 90%.

Polymeric ferric sulfate is used to treat synthetic detergent wastewater. The flocculant particles formed are large and heavy with rapid sedimentation. It has good demulsification effect on emulsified oil in wastewater, and has good adsorption effect on micro bubbles in wastewater. After treatment, the effluent does not produce the phenomenon of iron ion backward. It remains clear and transparent for a long time and can be reused.

3. Treatment of paper mill wastewater

Lvyuan Environment Group Co.,Limited found that 3.6 g polyferric sulfate or 2.5 g polyaluminum could reach the national discharge standard after 20 min precipitation.

When polyferric sulfate is used, alum flower is formed quickly, the particle is large and dense. If 7000t wastewater is treated every day, the use of PFS can save about 1000 yuan compared with polyaluminum chloride.

4. Treatment of other industrial wastewater

The results show that the treatment of copper containing wastewater by PFS can achieve good results in log cooking wastewater and sludge dewatering.