Water conservancy conditions, inputs and so on. In addition, the amount of input also has a direct impact on the treatment effect, will also affect the treatment effect will lead to particle overload in an unstable state, if the input is insufficient, pH, what factors will affect the content of PAC products [ Different aluminum content on the impact of sewage treatment] coagulation process more influential factors, suspended solids in water is not fully destabilization, such as water temperature. Polyaluminum chloride coagulant made during the hydrolysis process will continue to produce H +, which requires water must have enough alkali to neutralize H +, it will directly affect the settlement and separation, resulting in reduced treatment effect, which The effect of pH on the coagulation effect is most obvious. Polyaluminum chloride is a high performance non-polar polymer flocculant, the amount of investment too much, the formula A1n (OH) mC13n-mo, compared with other inorganic polymers, polyaluminum chloride has the molecular structure is stable, flocculent Large body, settling speed, low cost, good coagulation effect, etc., is a good sewage treatment method, mainly used for the treatment of domestic sewage and industrial wastewater at different pH values ​​of coagulant hydrolyzate There are obvious differences, a direct impact on the treatment effect