The degreasing wastewater comes from the degreasing wastewater of galvanizing line, the color coating line and the process wastewater. Because the degreasing agent containing alkaline substances, surfactants and corrosion inhibitors is used in the degreasing process, the degreasing wastewater contains grease and a small amount of emulsion, and the main pollutants are PH, ss, COD, BOD, oil and chroma.
Nonfat wastewater is difficult to degrade because surfactants and other substances contained in nonfat wastewater have strong inhibition on anaerobic bacteria. Anionic surfactants have a strong inhibitory effect on acidogenic bacteria and methanogenic bacteria in the anaerobic reaction process. At present, the national pollutant discharge standards for sewage treatment plants are generally improved, and the discharge water quality is more stringent. Therefore, it is necessary to find a demulsifier with low cost, good treatment effect and high universality for all kinds of emulsified wastewater.
The demulsifier of degreasing wastewater belongs to inorganic and organic complex polymer cationic copolymer with high molecular weight and unique chemical structure. After dissolved in water, it can play the role of interparticle adsorption bridge and electric neutralization at the same time, and the emulsion oil and colloid in the wastewater can be condensed and separated and precipitated; Good oil removal, decolorization, demulsification effect, can remove oil and gum in wastewater, large alum in water, fast settling speed, decolorization effect is greater than 90%, COD reduction is also more obvious, and the amount of sludge is small. The simple process can complete the demulsification and coagulation process.
In the process of treating degreasing wastewater, when the wastewater enters the grease trap for particle and suspended oil removal, it can be put into the degreasing wastewater demulsifier to remove the emulsified oil, a large number of SS, COD and chroma and other substances in the wastewater, and the demulsification speed is extremely fast, which is conducive to improving the treatment effect of the subsequent wastewater treatment process and does not affect the load of subsequent treatment!
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