Polymeric aluminium chloride (PAC) is a widely used inorganic flocculant, but it exists in a large dosage, if the
polyacrylamide and
polymeric aluminium chloride synergistic effect, it will greatly reduce the dosage of PAC. And can achieve good treatment effect, low cost and other characteristics. Printing and dyeing or dyestuff wastewater after biochemical treatment of chromaticity is often difficult to meet the standard, the use of polymeric aluminium chloride for the depth of decolorization treatment effect is better.
Printing and dyeing wastewater flocculation decolourisation mechanism is based on adsorption bridging theory. In terms of inorganic flocculants, iron, aluminium and other flocculants undergo hydrolysis and polymerization, generating high-valent polyhydroxyl cations, and colloids in the water for the compression of the double layer, electric neutralisation and destabilisation, adsorption and bridging and supplemented with precipitate netting, sweeping effect, precipitation to remove the generation of coarse flocs (alumina), so as to achieve the purpose of decolourization of water purification. For organic polymer flocculants, in addition to electrical neutralisation and bridging, there may also be similar chemical reaction bonding flocculation mechanism.
Biological treatment of dyeing wastewater colour removal is generally only 50% to 60%; and physicochemical methods of coagulation and precipitation decolourisation up to 50% to 90%, generally for direct dyes, reducing dyes, sulphur dyes, disperse dyes and colloidal substances have a better removal effect, the removal rate of colour can be up to 80% to 90%, the removal rate of COD can be up to 50% to 80%, but for acidic dyes, reactive dyes, But for acid dyestuff, reactive dyestuff, metal complex dyestuff and cationic dyestuff, the decolour removal effect is not good, generally only 50%～60%.
At present, polymeric aluminium chloride (PAC) is generally used as a coagulant, polymeric aluminium chloride has good decolourisation effect on dye wastewater, when the dosage is 0.05%, the decolourisation effect is good for 5 types of dyes. The decolourisation efficiency of polymeric aluminium chloride is better for paint and reducing dyestuffs which are in suspension in wastewater, and it is second to sulphur dyestuffs and naftal dyestuffs, and the decolourization effect of water-soluble reactive dyestuffs is poorer. In addition to increase the dosage of polymeric aluminium chloride, can improve the decolourisation effect. For example, for printing and dyeing wastewater containing sulfide dyes and naftal dyes, when the dosage of polymeric aluminium chloride is increased to 0.08% and 0.1%, the decolourisation efficiency will be increased to 81% and 90% accordingly, but the treatment cost will be increased accordingly.
With the rapid development of dyestuff industry, the dyestuff used in printing and dyeing industry has reached tens of thousands of varieties, usually we use polymeric aluminium chloride for preliminary treatment. More than thirty years of hard work and struggle, the achievements of the credibility, excellent quality, service, ‘Xinhuan Chemical’ brand, but also out of a new high-tech products, economic benefits and environmental protection and sustainable development of ‘Xinhuan Chemical’ characteristics of the road.
The main products of flocculant manufacturer Xinhuan Water Treatment are:
White polyaluminium chloride (food grade),
drinking grade polyaluminium chloride, industrial grade polyaluminium chloride,
anionic polyacrylamide,
cationic polyacrylamide, nonionic polyacrylamide, petroleum recycling polyacrylamide, oil recovery polyacrylamide, polyacrylamide, polymer flocculant polymer flocculation coagulant, polymeric ferrous sulphate, polymerized iron and aluminium chloride, and other water treatment chemicals. Welcome customers to write to us to negotiate business! Tel/WhatsApp：86 15936201203 Email：maggie@xhwtm.com Contact:Maggie
