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- COD AND BOD REMOVAL
- The main applications of polyacrylamide(PAM,FLOCCULANT)
Dyeing textile industry is one of the world's fastest growing industry, currently known dye varieties has reached as much as tens of thousands of content complexity, high production process of sewage treatment difficulty, cationic polyacrylamide flocculant CPAM treatment of dyeing textile wastewater has a great advantage.
Textile wastewater main raw material cooking, rinsing, waste water containing natural impurities, organic substances such as fats and starch bleaching, sizing, etc. generated in the process. Dyeing wastewater is dyeing, printing, sizing, and other procedures produced, contains a lot of dye, starch, cellulose, lignin, detergents and other organic matter, as well as base, sulfide, various salts and other minerals, pollution strong.
Textile wastewater is characterized by high concentrations of organic matter, complex composition, color depth and varied, pH changes, big changes in water quantity and quality, is intractable industrial wastewater. With the development of chemical fiber fabrics, silk dyeing and finishing the rise and increase requirements to make PVA pulp, rayon alkaline hydrolyzate, the new dyes, additives and other refractory organics poured into the textile printing and dyeing wastewater, the traditional wastewater process pose a serious challenge, COD concentration from the original hundreds of milligrams per liter rose to 3000 ~ 5000mg / l. Dyeing Waste Water with a high degree of color, COD is high, especially in developed foreign markets based on blue silk, satin black, special dark blue, black and other special deep dyeing process, such extensive use of sulfur dyeing, printing and dyeing auxiliaries, such as sodium sulfide, and therefore wastewater contains large amounts of sulfur compounds, such waste must dosing pretreatment, and then the series of processing, in order to stabilize emissions standards. Dyeing wastewater containing a dye, a slurry, a surface active agent additives, such large waste water, concentration, and chroma was low, if only using the physico-chemical treatment, the water is also between 100 ~ 200mg / l, chromaticity also to meet emissions requirements, but the large increase in pollution, the higher the cost of sludge treatment, likely to cause secondary pollution, more stringent environmental requirements in the case of biological treatment systems should be fully considered conventional enhanced biological treatment processes to meet processing requirements.
If the direct emissions such as natural water body, will weaken the penetration depth of the sun in the water, reducing the photosynthesis of aquatic plants. Is one of the world's major hazardous waste. And methods used textile dyeing wastewater treatment activated sludge adsorption, oxidation flocculation method. Polyacrylamide flocculant to play in the textile printing and dyeing wastewater treatment a significant role, is a simple and easy to operate, economical and practical effect of outstanding wastewater treatment chemicals.
Cationic polyacrylamide flocculant CPAM, because of high prices, increasing the cost of sewage treatment enterprises, it is generally used in conjunction with PAC to expedite the processing of textile printing and dyeing wastewater, and using methods of organic and inorganic pharmaceutical agents used alone than with a the effect of water treatment chemicals is better, in terms of decolorization, COD, BOD, SS, ammonia removal, or both agents with efficient sewage treatment, have been recognized by the majority of the sewage treatment business.