With the rapid development of early industry, there are many kinds of sewage, which causes a headache in metallurgy. Because it is difficult to treat the sewage according to the specific conditions of each industry, polyaluminium chloride is used as the matrix, mixed with other chemicals, and mixed into composite PAC. The sewage can be treated with surprising results.
First of all, because of the large molecular structure, strong adsorption capacity, low dosage and low treatment cost of polyaluminium chloride. It has good solubility and high activity. The alum flower formed by coagulation in water body is large, settling is fast, and its purification capacity is 2-3 times larger than other inorganic flocculants. Polyaluminium chloride has strong adaptability and is little affected by the pH value and temperature of water body. After purification, the raw water can reach the national standard of drinking water. The content of cation and anion in the treated water is low, which is conducive to the preparation of ion exchange treatment and high-purity water.
Then, the polyaluminium chloride is less corrosive and easy to operate, which can improve the labor intensity and working conditions of the dosing process. When polyaluminium chloride flocculant and polyacrylamide are used together, we should add them in order according to different water quality, and the dosage should also be determined by test. In fact, Polyalumina can also be used alone, but its price is higher than that of PAC, and the effect is not worse than that of PAC. Of course, it depends on the water quality. If the treated water is to be discharged, the toxicity of acrylamide monomer should also be considered. When there is a lot of suspended matter, PAM alone can also be used.