Does temperature have a great influence on the flocculation effect of polyaluminium chloride?
2022-10-21
The so-called industrial polyaluminium chloride is mainly used for sewage purification. It has very special properties that allow it to flocculate and settle very fast, to complete the whole process very well and to have good filtering properties. It does not need to add any alkaline additives and can very effectively remove harmful metal substances and radioactive substances from water, as well as remove bacteria and odors. The pipes and other equipment are completely non-corrosive. The whole water purification effect is very remarkable. This industrial polyaluminium chloride can only be used for industrial wastewater treatment to prevent the purification of used products and drinking water, which is very harmful to humans.
It is said that what is used in industry can only be used in industry. The polyaluminum chloride used in life is mainly used for the purification of drinking water. These substances are related to human health and therefore they have a very important role. Related to health and safety, these are monitored by the relevant components, which are very serious, and the dosage and use are strictly controlled and can only be used after the approval of the relevant components. Although polyaluminium chloride used in industry and in life is very similar in appearance, it fundamentally affects the human body in some way. Care should be taken when using it. These two different products are distinguished. We cannot use both thicknesses, let alone each other, to avoid all bad operations.
Polyaluminium chloride is a kind of inorganic polymer flocculant, which is widely promoted and used in the market. It first destabilizes, activates, flocculates, coagulates and precipitates suspended particles and colloidal ions in water through the action of mechanisms such as tightening double layer, adsorption electric neutralization, adsorption bridging and sediment net trapping. Fast sewage treatment, low dosage, polyaluminium chloride in the flocculation process needs to go through the hydrolysis process, high temperature is conducive to hydrolysis. Therefore, the hydrolysis time required to add PAC at low temperature is longer, and the hydrolysis time can be shortened after a slightly higher temperature.
Temperature has a great influence on the flocculation effect of polyaluminium chloride. When the water temperature is lower than 5℃, the hydrolysis rate of aluminum salt is very slow and the hydrolysis effect is significantly reduced. When the temperature is 10~15℃, the Al(OH)3 floc is amorphous, loose and not easy to precipitate, the water temperature is low, the water consumption coefficient is large, the resistance increases and the protrusion decreases, which affects the flocculation effect. At this time, polymer coagulant can be added to improve the treatment effect, or air flotation can be used instead of sedimentation as the subsequent treatment process. When the temperature rises, the floc is relatively tight and easy to precipitate.
Is polyaluminium chloride (aluminum trichloride) (AL) harmful to human body? We should know that polyaluminium chloride is not a dangerous product. In the specific application process, it not only has strong coagulation and turbidity removal effect, but also has significant decolorization and humus removal effect; secondly, the content of polyaluminum chloride used in water plants is 30%, and the high content of polyaluminum chloride has few impurities and high effective content, which meets the national drinking water requirements. Polyaluminum chloride is used in the process of water purification, and it undergoes multiple precipitation and filtration. After filtration, the harmful residues (QMA) in the polyaluminum chloride water purifier (common flocculant) are basically non-existent, or there are trace amounts, which have almost no effect on human health.
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