The use sequence of polyaluminum chloride and polyacrylamide

The order in which polyacrylamide and polyaluminum chloride are mixed is very important, which has a great influence on the final product.  Polyacrylamide and the two kinds of water purifying agent pac in a lot of sewage with use effect is good, but many customers are buying that polyacrylamide and polyaluminium chloride after the use of specific steps is not too clear, after all, the efficiency of the use right way to deal with the sewage is not so good as expected, so it is very important to add order.  

Polyacrylamide and polyaluminium chloride when used to need to dissolve, polyacrylamide dissolved proportion is one over one thousand, which is 1 kg of water dosing a gram of polyacrylamide, dissolve the polyaluminium chloride, five percent is a kilogram of water inside it is ok to add 50 grams of polyaluminium chloride,  Polyaluminum chloride solution is generally brown or tawny solution, almost no viscosity, and polyacrylamide solution is a colorless transparent viscous liquid, like the use of liquid glue, if put in the glass, take out can be drawn.  After dissolution, polyaluminum chloride needs to be added first and then polyacrylamide is added. The first use of polyaluminum chloride is to complete the neutralization charge/colloid instability to form small flocs, and further increase the volume of flocs is conducive to full precipitation.  

Because of the short reaction time of polyaluminum chloride, it needs to be mixed strongly after joining, and the action time of polyacrylamide is long. Polyacrylamide belongs to the flocculant, and polyaluminum chloride belongs to the coagulant. In simple terms, the coagulant is added first and then added flocculant.  After adding the polyaluminium chloride needed time interval between the additive polyacrylamide, general advice about 20 seconds, need at least 5 seconds, can be controlled in the process, but not a piece of dosing, the two products mixed directly, it is likely to produce flocculation reaction, which is as a substrate, a flocculating agent,  This will image effect and even increase the cost of use.  

, of course, also is not each kind of sewage to add order, such as turbidity wastewater is high, should first dosing anionic polyacrylamide, again adding the polyaluminium chloride, let anionic polyacrylamide is give full play to the role in the high turbidity water, adsorption of colloidal particles, decrease turbidity, the rest of the colloidal particles by polyaluminium chloride, off again by anionic polyacrylamide adsorption,  This can reduce the amount of polyaluminium chloride.  The specific use order needs to be determined by small trial, each kind of sewage use proportion and add amount is not the same, which need to be tested to get the appropriate amount.