Polyaluminum chloride treatment of printing and dyeing wastewater decolorization of the reasons for the poor? Polyaluminum chloride treatment of printing and dyeing wastewater decolorization of the reasons for the poor? A printing and dyeing plant in the wastewater treatment process recently encountered problems, thus, come to counseling, the questions are as follows: Why use polymeric aluminum chloride to decolorization is poor? Is it because there is no reason to add alkali? (The current PH value of 6 or so) In fact, the role of PAC in flocculation in the treatment of wastewater, that is, in the process of aluminum chloride into aluminum hydroxide adsorption of insoluble materials, the particles become larger heavy heavy sink . If the color of the water is mainly produced by some insoluble water colored particles, then the decoloring effect is also ideal, if the color is mainly made of some water-soluble molecules, then the decolorization effect is poor. In addition, there is a point that the decoloring effect of polyaluminum chloride mainly utilizes the coagulation effect of polyaluminum chloride, that is, the dosing agent is added to the wastewater so as to cause the colloidal pollutants in the wastewater to destabilize and aggregate to form a slurry which is easy to separate from muddy water Flocculation, so as to achieve decolorization effect. The main factors affecting coagulation wastewater turbidity, PH value, water temperature and so on. Can be adjusted according to the above conditions. If not enough, you can increase the dosage, or replace the agent. This information is a source of original filter water, for reprint please indicate the source URL: http://www.gyzhenyu.com