Low Temperature and Low Turbidity Water Polyaluminium Chloride Effect of Water Purification 1, the impact of water temperature. Water temperature is crucial in many of the elements that affect water treatment. Low temperature has a great influence on the hydrolysis rate of coagulant, and low temperature can slow down the hydrolysis reaction. The water temperature is low, the viscosity of water increases, the sedimentation speed of particles and floc in water slows down, and the gas dissolves in low temperature. The gas dissolved in water increases, and many of them are adsorbed around the flocs, which is not conducive to the sedimentation of flocs and particulate matter. Low water temperature, colloidal particles in the water intermolecular discharge potential increases, the repulsion increases, is not conducive to colloidal particle knocking instability. 2, the impact of particulate matter in water. Particulate matter concentration in water is another important factor that affects the effect of polyaluminium chloride treatment. Whether it can get a good treatment effect, the number of particles per unit volume and the number of useful bumps between particles are the most important constraints. High concentration of particles, bump timing, is conducive to colloidal particle aggregation and floc growth. Low temperature and low turbidity water particle concentration is very low, the probability of bump is very small, combined with low water temperature, brown kinetic energy is small, the particle movement is not active, agglomeration is not good.