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Dyeing textile wastewater treatment
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.
MMetallurgical industry output a lot of air and water pollution, caused great harm to the environment. APAM anionic polyacrylamide flocculant iron and steel metallurgy sewage treatment, sewage flocculation metal particles form groups to achieve the purpose of sewage treatment, high efficiency, good effect.
Metallurgical industry many products, the production process into a series of various discharge large amounts of waste water, waste water pollution is a major environmental water recycling is an important measure of metallurgical waste water treatment: development and adoption of clean water and without water or less new technology and less pollution, new technologies. Development of utilization, and thermal recovery of useful substances from waste gas, the reduction of fuel wastage of materials. Within enterprises of various water depending on the water quality requirements, the overall balance, streaming use, while improving the quality and stability measures to continuously improve the utilization of the water cycle. Development for metallurgical characteristics of the new wastewater treatment processes and technologies.
Metallurgical waste water mainly from production processes, equipment cooling water, cooling water and steel site clean water and so on. Metallurgical wastewater contains large amounts of mercury, lead, arsenic, zinc and other heavy metals, as well as BOD, COD, phenol, cyanide and sulfide. Sewage complex composition, suspended particles, high metal concentrations, positively charged ions sewage, sewage PH value mostly neutral and alkaline. Must be treated before discharge, or would cause great harm the environment. Containing anionic polyacrylamide flocculant molecular chains -CONH2 APAM anionic groups, after flocculant flocculation and sedimentation, cooling and circulating water in order to achieve recycling.
Metallurgical industries APAM anionic polyacrylamide flocculant is mainly used to remove the circulating water and impurity ions in the production process, generally used in the APAM molecular weight of 10 million or more preferably, about the use of 7-15g per ton of waste anionic polyacrylamide .etallurgical waste water treatment