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PAC Coagulation Process
Jul 21, 2017

PAC Coagulation process

Polyvinyl Chloride flocculant coagulation process has three stages

(1) PAC polymerization of aluminum chloride flocculant coagulation stage: the liquid into the coagulation and coagulation of raw water in a very short period of time to form a fine alum process, this time the water becomes more turbid, it requires the water can produce intense Turbulence. Beaker experiment should be fast (250-300 r / min) stirring 10-30s, generally no more than 2min.

(2) PAC polymerization of aluminum chloride flocculant flocculation stage: First, alum growth process of thickening, requiring appropriate turbulence and sufficient residence time (10-15min), to the late can be observed in a large number of alum Sinking, forming a clear layer of the surface. The beaker was stirred at about 150 rpm for about 6 minutes and then stirred at 60 rpm for about 4 minutes to the suspended state.

(3) PAC polymerization of aluminum chloride flocculant settling stage: it is the sedimentation tank in the process of flocculation sedimentation, requiring slow water flow, in order to improve the efficiency of the general use of inclined tube (plate) sedimentation tank (the best use of flotation separation flocculation ), A large number of coarse alum filled taper tube (plate) wall block and deposited in the bottom of the pool, the upper water for the clarified water, the remaining small particle size, small density of alum side slowly down, while continuing collision with each other Large, to the late Yuzhu basically unchanged. Beaker test should be 20-30 r / min slow support for 5 minutes, and then static 10 minutes, measured Yu turbidity enhanced filtration, the main rational use of filter layer structure and filter aid to improve the removal rate of high filter, it is An important measure to improve water quality.

According to the form of poly aluminum chloride can be divided into spray polymerization of aluminum chloride and solid poly aluminum chloride. Sprayed poly aluminum chloride due to the product and the water between the larger contact area, so wetting performance than powder products, the speed of purified water was significantly higher than the powder products, widely used in power plants and other water treatment.

Solid state polyaluminium chloride is also our most commonly used polyaluminium. Has a wider range of uses. (PAM), aluminum chloride, aluminum chloride, ferrous sulfate, poly aluminum chloride, sodium hypochlorite, sodium polychloride Iron (poly iron), sodium hydroxide.

In daily life, the use of poly aluminum chloride is very large, can be widely used in life, production of water, domestic sewage, industrial wastewater / sewage purification treatment, low temperature and low erosion water purification, paper, tannery wastewater treatment, Thermal power plant ash ash waste water recycling, printing and dyeing, wool, waste water to COD, BOD and SS decolorization purification, the market is also very mature and stable a water treatment products.

1, poly aluminum chloride (PAC) color Appearance: yellow, light yellow powder crystal grain or sheet solid.

2, poly aluminum chloride performance: Polyaluminium Chloride for domestic sewage treatment (PAC), also known as basic aluminum chloride or coagulant, is between AlCl3Al (OH) 3 A water-soluble inorganic polymer, chemical formula [Al2 (OH) nCl6-n] m where m represents the degree of polymerization and n represents the neutrality of the PAC product. The color is yellow or light yellow, dark brown, dark gray resinous solid. The product has a strong bridging adsorption performance, in the process of hydrolysis, accompanied by condensation, adsorption and precipitation and other physical and chemical processes. The basic difference between polyaluminium chloride and traditional inorganic coagulant for living sewage treatment is that the traditional inorganic coagulant is a low molecular crystal salt, and the structure of polyaluminum chloride is composed of morphologically variable polyhydroxy complex Shaped inorganic macromolecules, and thus polyaluminium chloride exhibits many specific coagulation functions that are different from conventional coagulants. With the calcium aluminate adjustment method of production of PAC products, salt degree (alkalinity) can be greatly improved, production and application of economic benefits is very obvious, salt from 65% to 92%, the cost of raw materials can be reduced by 10% , The applicable cost can be reduced by 40%. Water purification effect is better than other similar products in the production process.