Polyaluminium chloride used when the surface will have floating things? Poly aluminum chloride in the use of the process must have different problems, not a professional technician in the operation of the goods, there will certainly be more and more problems. For example, the use of polyaluminum chloride in the process there will be a lot of you do not understand. Sometimes customers will inquire: the use of PAC water purifier for the water there will be suspended for a long time does not precipitate it? Why is there a yellow foam floating on the water? 1, why polyaluminium chloride used when there will be floating surface water? If you want to solve PAC suspended in the course of the use of the reasons, mainly depends on what system you use, what is the characteristics of suspended matter occurs, will not be the wrong model or dosage, and secondly on the market The quality of the PAC is very different, the quality of the PAC used is better, the better the PAC is almost no water insolubles, and you can find several more suitable for their own screening. The general user to do such experiments using polyaluminium chloride and other flocs to precipitation, large particles quickly, the small is always suspended in water, this time can also be used in conjunction with polyacrylamide, should also be able to avoid this Occurrence of the class situation. 2, the use of polyaluminium chloride surface after the emergence of yellow foam floating? Adding polyaluminum chloride and biological wastewater in the pool of volatile fatty acid salt reaction generated volatile fatty acids by aeration to float in the liquid surface, due to the larger surface tension of such foam, not broken, in nature State can maintain two or three days time. Another point is that if there is the phenomenon described above, to determine whether the dosing for intermittent dosing, if it is intermittent dosing, then most likely to cause local overdose situation, the local over-generation of aluminum hydroxide colloid, Activated when the adsorption of activated sludge on the surface of the formation of a yellow foam. The added polyaluminum chloride affects the alkalinity balance of the biochemical system, affects the metabolism of the microorganism, and secretes some extracellular products. Most of these products are polysaccharides and colloidal substances, so bubbles can also be formed by aeration. The last thing to consider is the quality of the polyaluminum chloride product used, such as: the content of active ingredients, the content of simple substance has reached the national standard requirements.