Advantages of Polyaluminium Chloride for Treatment of Chemical Wastewater 1.28% Polyaluminum chloride not only has a strong coagulation and turbidity removal effect, but also has the effect of significantly decolorizing and removing humus. In the same treatment conditions to achieve the best flocculation, the required dosage of aluminum polyalkylene to reduce the traditional 2/3 as much. Under the same dosage conditions, the use of polyaluminum chloride to obtain lower residual turbidity than the traditional aluminum salts, so the same treatment results can be obtained at lower doses. 2, generally 5 ℃ in low temperature water, the coagulant turbidity removal efficiency of the traditional coagulants significantly reduced and lead to deterioration of water quality, and the use of aluminum, whether it is low or normal temperature water, can get better Turbidity effect. In addition, 28% polyaluminum chloride can significantly improve the solid-liquid separation efficiency, improve sedimentation filtration and sludge dewatering performance, thereby shortening the settling tank residence time and increasing water production. In addition, filtration and sludge dewatering are facilitated due to the large and compact flocs produced. Chemical plant waste before treatment, the pipe around the drain, there is a layer of black mud covered with oil-like things. The entire drainage ditch is muddy and floats on the surface with a dull yellow color. There is a smell of gas in the waste water.