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Nonionic polyacrylamide for paint wastewater treatment
Paint wastewater mainly comes from wet spray chamber water washing chamberj air, paint and organic solvent in the air is transferred to the water to form the painting wastewater. Containing a large amount of paint particles in the waste water, the water quality by using coating (with lacquer, paint, amino alkyd paint and epoxy paint), solvent (such as ethanol, acetone, benzene, esters) and additives and. Paint (paint) industrial wastewater has the characteristics of complex components, such as COD high organic concentration, poor biodegradability, less water and great change, aromatic chlorinated hydrocarbons often contain water, salts of fatty acids and fatty alcohols such as methanol, with organic compounds.
Nonionic polyacrylamide is water-soluble polymer or polymer electrolyte. The polar groups on the molecular chain containing a certain amount, it can through the adsorption of solid particles suspended in water, bridging between particles or particles through the charge and make the formation of large flocs. So, it can accelerate the settlement of particles in suspension, have obvious to speed up the solution to clarify the effect of promoting filtration. Nonionic polyacrylamide for paint wastewater has a good purification effect.
Paint wastewater treatment by using high efficient coagulant (NPAM) enhanced coagulation test and oxidation flocculation reactor to remove organic pollutants, through experiment with coagulation, oxidation flocculation reactor and subsequent biochemical methods combined treatment of high concentration of high polluting oil paint wastewater has high processing speed, good effect and economical and practical features. The key is the oxidation flocculation reactor. In the oxidation flocculation reactor device, according to the type and nature of the removal of pollutants in the wastewater needs, filling all kinds of efficient special materials, catalysts and other auxiliary agent, mixed filling material removal of some inorganic or organic pollutants and they are reasonable in structure and compact oxidation flocculation composite bed. When the paint wastewater flows through the oxidation flocculation reactor device, under certain operating conditions, the pollutant filling material within the device will be in the wastewater and the occurrence of a series of physical and chemical actions, oxidant and coagulant ecology generate one or more new ecology, such as physical and chemical coagulation, mixed effect adsorption, catalytic oxidation, complexation, and other replacement at the same time, the pollutants in the wastewater is removed rapidly.
The principle of polyacrylamide flocculation: ion degree has higher molecular weight, different flocculant. The particles can be fixed adsorption unstable in the molecular chain, so in the flocculant process, the sludge particles in the water gradually increased, the formation of a larger floc, forming floc will lead to separation, easy to remove moisture in dehydration.
According to the nature, suspended material concentration and polyacrylamide flocculation, precipitation can be divided into: natural sedimentation, flocculation, precipitation area. A suspended domain precipitation cry high concentration (more than 5000mg/L), the settlement affected by other surrounding particles, maintain the relative position between the particles unchanged, forming a whole sink together, with a clear mud interface between clear water. Area precipitation occurs two times in sedimentation tank and sludge thickening tank.
In the wastewater suspended solids concentration is not high, and don't have condensed performance, in the process of precipitation, solid particles does not change shape, also is not bonded to each other, independently complete precipitation process. (sand pool and early early clarifier precipitation) compression precipitation occurred in the settlement process of high concentration of suspended particles, due to the high concentration of suspended particles, the particles have been squeezed between the integrated mass structure, contact with each other, mutual support, out of heavy force lower water between particles in the upper particle, the sludge concentration. Two heavy polyacrylamide concentration process of the bucket in the sludge and sludge concentration process is compressed in the concentrated tank precipitation. The precipitation occurred in the water suspended solid concentration is not high, the precipitation process of suspended solid particles do not interfere with each other, separate precipitation, precipitation particle trajectories in a straight line. The precipitation process, the physical properties of particles, such as shape, size and weight is not change. The precipitation particle in the grit chamber is free of precipitation. In the wastewater suspended solids concentration is not high, and don't have condensed performance, in the process of precipitation, solid particles does not change shape, also is not bonded to each other, independently complete precipitation process. (sand pool and early early clarifier precipitation) compression precipitation occurred in the settlement process of high concentration of suspended particles, due to the high concentration of suspended particles, the particles have been squeezed between the integrated mass structure, contact with each other, mutual support, out of heavy force lower water between particles in the upper particle, the sludge concentration. Two sedimentation tank sludge concentration process of bucket and concentration of sludge in a concentrated tank is compressed polyacrylamide precipitation.
Flocculation is the process of flocculation precipitation particles in water. In the water coagulant, the interaction of suspended solids and colloidal particles dispersed in molecular force generated in the process of settlement and floccule they collide with each other together, the size and the quality unceasingly, sinking speed increasing. The removal rate of suspended material not only depends on the deposition rate, but also related with the depth of precipitation. The formation of ground water coagulant after alum, organic suspended matter in sewage, activated sludge will appear flocculation phenomenon in the precipitation process.