Analysis of polyaluminum chloride and polyaluminum chloride treatment of paper-making wastewater effect than the analysis of polyaluminum chloride and polyaluminum chloride treatment of paper-making wastewater effect than polyaluminum chloride and polyaluminum chloride treatment of papermaking wastewater through the major paper The utilization of the plant has been borne and understood by us. According to statistics in recent years, at present, China's paper industry wastewater discharge accounts for 15% of the total industrial wastewater discharge; COD discharge accounts for 1/3 of the total industrial COD discharge in China the above. The pollution and damage of papermaking wastewater have drawn people's attention. Because papermaking waste water contains lignin, cellulose and other refractory substances, high chroma, high content of fine colloidal substances, suitable for pretreatment with PAC coagulation method or depth treatment, because the paper is negatively charged, the cation is usually selected Type polymer coagulant, at the same time from the compressed double-layer, adsorption and electricity absorption, bridging, net arrest and so on, so that the pollutants in the wastewater destabilization and aggregation into large micro-floc, and then from the wastewater Do not separate out, sedimentation good effect. Paper mill widely used coagulant is polyaluminum chloride and polyaluminum chloride, not only low cost, and PAC treated sediment can be recycled as a papermaking material, which has high economic value; PAC and PFC in the cast When the dosage is less than 30mg / L, the activated sludge is not affected, and the influence of PFC on the activated sludge is less than that of PAC on the activated sludge, which is beneficial to the subsequent treatment of the activated sludge. Experiments show that the selection of polyaluminium chloride coagulant for the treatment of papermaking wastewater, the pH value of 8, the dosage of 6mL, the wastewater treatment is better, at this moment the wastewater decolorization rate of up to 78%, CODCr removal rate of up to 37 %. In the selection of polymeric ferric chloride coagulant for the treatment of papermaking wastewater, pH value of 8, the dosage of 6mL, the wastewater treatment is better, at this moment the decolorization rate of wastewater up to 90%, CODCr removal rate of up to 43%. The inductive effect of two coagulants and economic analysis Poly aluminum chloride and aluminum ferric chloride coagulant treatment of the same effect of water samples From the above test shows that under the best conditions pH and coagulant dosing The amount of both are the same, polyaluminum chloride on papermaking wastewater coagulation chroma and CODCr removal rate higher than polyaluminum chloride.