Shallow flotation process of printing and dyeing wastewater treatment how to determine the investment point and reaction time? Shallow flotation process of printing and dyeing wastewater treatment how to determine the investment point and reaction time? With the gradual increase of urban water consumption, water shortage is more and more serious, such as direct discharge of treated water, wasted valuable water resources. Water reuse is imperative, water reuse has a very high social and environmental benefits, it can reduce the amount of environmental emissions, reduce environmental pollution. Wastewater is printing and dyeing wastewater, mainly disperse dyes, according to the truth that the removal rate should be high. Polyaluminum chloride dosage 200ppm, polyacrylamide dosage 5ppm. Flotation bottom set pipe mixer, polyaluminium chloride dosing point in front of the pipe mixer, polyacrylamide in the pipe mixer, close to shallow flotation rising standpipe. Alum can be seen in the water, but the particles are not large, dissolved gas system is normal. Now ask for advice: Shallow flotation before, dosing point and reaction time should be how to determine, more conducive to the flotation effect. If the tube speed is not very large, polyacrylamide can increase the appropriate point, if the tube speed is relatively large, it is recommended to add 4-10 meters away from the pipeline to add. The general coagulant reaction time can be 30S, the premise is to be able to quickly mix well. Alum flower particles is not large, polyaluminum chloride may be insufficient dosage, and if the pipeline flow rate, polyacrylamide can easily be broken up, can be smaller. For more information on wastewater treatment, please pay attention to the source of water purification official website http://www.gyzhenyu.com