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Polyacrylamide application in dyeing wastewater treatment as flocculants
Flocculation refers to a labile colloidal particles (or the particles formed during condensation) polymerization process together to form aggregates. Helps to flocculate the particles separated from the aqueous medium. Coagulant by suspended solids like particles will gather together to make water more pure, and these solid-like particles are also easily and quickly separated from the water. Many oil, mining, paper mills enterprises will use coagulant.
Printing and dyeing was carried out on the textile material in the process of machining, including pretreatment, dyeing, printing and finishing process of four.Discharge printing and dyeing of the four processes.Printing and dyeing wastewater is produced in the process of fabric in the above wastewater, mainly contain all kinds of textile pulp dye, chemical fertilizer, etc., some of the slurry fuel of high concentration of mineral salts and the high concentration of organic compounds
The characteristics of printing and dyeing wastewater, water;High concentration is high, most of the alkaline wastewater, COD, colour and lustre is deep;Water quality fluctuation, used dyestuff, dyeing factory production technology and vary with types and management level of different textiles;Give priority to with organic pollutants;Treatment is difficult;Part of the waste water containing toxic and harmful substances.
Dyeing wastewater treatment cationic polyacrylamide flocculant sludge dehydrating agent
With the rapid development of the dye industry, around the world use dye varieties has amounted to tens of thousands of species, we usually use the polyacrylamide, use of polyacrylamide composite flocculant to deal with the advantage of printing and dyeing wastewater is what?Usually according to the characteristics of the dye hair color system can be divided into anionic dyes, direct dyes, acid dyes, reactive dyes, etc.), cationic dyestuff (basic dye) and nonionic (disperse dye).High colority, refractory dye wastewater, emissions to the environment can reduce sunlight penetration depth in the water, water plant photosynthesis, therefore, printing and dyeing wastewater containing dye has become one of the main harmful waste water in China, under the following to introduce the advantages of inorganic flocculant treatment of printing and dyeing wastewater.
Commonly used decoloring treatment with activated sludge process adsorption, oxidation flocculation method, etc.Among them, the method of flocculation is a simple, economic and effective method, its mechanism is thought to be by compressed double electric layer and adsorption electrical neutralization and adsorption bridging effect such as stability, form the floccules, precipitation separation again, so as to achieve the purpose of purification.In the flocculation of printing and dyeing wastewater treatment, often with inorganic aluminum salt, ferric salt is given priority to, in this kind of buried in water to remove cloth dye effect is good, but the water soluble dyes decolorizing effect is poorer. Inorganic/organic composite flocculant can overcome many disadvantages of the single flocculant, can reduce the processing cost while improve the efficiency of processing,Organic/inorganic composite flocculant decolorization rate is generally higher than that of inorganic flocculant polyaluminium chloride on the dye decolorization efficiency is higher than the single effect of flocculant, polyaluminium chloride and polyacrylamide/polyaluminium chloride to dyes decolorizing efficiency decoloring effect _ in the acidic environment is higher, but the optimal pH of different types of dyes decolorizing have certain differences
Polyacrylamide in industrial wastewater treatment generally there are three ways:
The first is not processed or just carry on some simple necessary processing can be recycled water again. Such general contamination of the content is not high, with water and is used to clean water, discharge to the environment pollution is not big.
The second is inside the factory make some simple necessary processing, wastewater discharge standard after discharge through underground pipes, into the sewage treatment plant for further treatment, recycling in the end.
And the third is completely within the plant processing, water quality reach a certain standard, can be directly applied in farmland irrigation or can be directly into the urban rainfall precipitation pipeline.
Shandong Shuiheng Chemical Corporation produced flocculants include: Cationic polyacrylamide (CPAM), Anionic polyacrylamide (APAM), Nonionic polyacrylamide (NON-PAM), Amphoteric polyacrylamide (A-PAM), Acrylamide and so on. Welcome to consult