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The effect of Polyacrylamide in chemical plant
Chemical plant as the major water users, in fresh water consumption for millions of cubic meters, water recycling rate is low. At the same time, the sewage millions of cubic meters, not only a waste of a large amount of water resources, but also caused environmental pollution and shortage of water resources has the large industrial water production pose a threat. To maintain the sustainable development of enterprises and reduce the waste of water resources, reduce production costs, improve economic efficiency and social benefits. Need to deal with chemical wastewater treatment (three level), as a circulating water or the power of the water to remove the salt water, to achieve the sewage reuse.
Chemical products in the production process generated waste water, emissions, toxic, organic high concentration, high salinity, high chroma, to high content of refractory compounds, governance is difficult, but at the same time wastewater also contains many available resources, and membrane technology as a new technique in the field of chemical production, energy saving and consumption reduction and clean production plays an important. Mainly transparent chrome dye wastewater, wastewater characteristics is mainly high COD (tens of thousands), the powder particles and dark in color. After the introduction of the latest technology from the United States ceramic membrane system processing wastewater, not only can recycle powder, for customers to create more benefits, but also can benefit the local environmental resources, do to discharge standard. The main characteristics of chemical wastewater are: the change of water quality and water quantity is big; the B/C is lower. Biochemical difference. General chemical wastewater with high chroma. PH value is strongly acidic or strongly alkaline, so it is very difficult to deal with. Treatment of chemical wastewater has become a worldwide problem. New chemical wastewater treatment technology of high efficiency and low cost is of very important significance to the study, which to get rid of the chemical industry is facing the embarrassing situation, to protect the water environment, and healthy development of the chemical industry has very realistic effects.
The first: polyacrylamide and decoloring agent use different. Decolorizing agent is mainly used to remove the water soluble organic matter, and cationic polyacrylamide and decoloring agent collaboration is mainly used as coagulant aid.
Second: polyacrylamide and decolorizer viscosity can be change after additives. Due to the raw material and technology of the decolorizing agent is, consumption of viscosity is highest do not exceed 200 CPS, general is around 100-150 CPS, these can be accomplished through controlling the temperature of the reaction. But if want to further increase the viscosity, it is necessary to add thickener to reach, it's like detergent, detergent just make viscosity is low, that why so thin, with a thickening agent is added. Decoloring agent, and adding thickener, can reach 500 CPS is the viscosity of decoloring agent, but the effect is like didn't add thickener, that also will be some difference, as a result of the thickener will add to a local active groups in the reaction, decoloring agent or shielding active group.
Third: polyacrylamide and different decolorant mechanism. Principle of decolorizing agent is a chemical, electrical neutralization to form small flocs, this will request the decolorizing agent must adhere to the good solubility, can ensure rapid spread in the water, and organic matter in waste water molecules of energetic collision contact reaction; Have just when the charge density at the same time, it's request of decolorizing agent molecular chain can't be too long. As decoloring agent is a polymer, a variety of raw materials in different echo response state, through the control temperature to ensure that the decoloring agent waste composition of the appropriate molecular weight. The larger the molecular weight, then elucidate the molecular chain of decolorizing agent is very long, will cause diffusion velocity is reduced, solubility decreased, especially in low temperature (below 5 degrees) in layered white, use;
Also reduced the charge density of the decolorizing agent, affect the collaboration with chemical bonds, reduce its use effect. If the smaller molecular weight, molecular chain reactive seldom like that, influence collaboration with chemical bonds, also reduce the collision time and organic matter, consisting of flocs is very small, can make the water residue after the disposal of many tiny suspended solids, affect water quality.
Fourth: viscosity is too high will reduce decolorizer decolorization effect. The decolorization of decolorizing agent is to active group and electrical neutralization. If the viscosity is very high, so will cost a lot of activity groups to form long chains; At the same time long molecular chains will lower charge density. High viscosity decreases its solubility in water, in the winter time is very easy to layered white, affect the use.
Fifth: the viscosity of the decolorizing agent on the decoloring effect can neglect. The bleaching of decolorizing agent is mainly rely on the reactive group on the molecular chain of key collaboration with and electrical neutralization, other adsorption bridging and the trap effect compare with limited. When high concentrations of the pollutants in the water, the adsorption bridging and the trap effect to wield some effect. Ordinary but theory, decoloring agent is used in biochemical pool water, at this time of COD is around 100 mg/L. And decoloring agent ordinary is and to cooperate with the use of aluminum, complete demand not decoloring agent to play to the role of the strong adsorption bridging and settling the trap.