Paint wastewater is mainly from the wet spray booths, washing the paint spray booth with air, air paint and organic solvents were transferred to the water to form the spray paint wastewater. Wastewater contains a large number of paint particles, the water quality by the use of paint (with nitro lacquer, amino paint, alkyd paint and epoxy paint), solvents (such as ethanol, acetone, esters, benzene) and additives set.
As in the electrophoretic paint wastewater in the main component of the free state of emulsified oil, biodegradable, can not be used biological treatment, must be used physical and chemical treatment. In wastewater treatment, the use of a variety of chemicals targeted removal of water in the need to remove the ingredients. Such as petroleum. Suspended solids and so on. A agent (inorganic polymer) is a multi-core, high-priced cationic compound pharmaceutical, the treatment of emulsified oil aqueous solution is particularly effective. In the process of wastewater treatment, firstly, the neutralization of colloidal particles and emulsified oil surface charge in the waste water, the electric double layer of the compressed micelles, along with the destruction of the electric double layer, the exclusion potential of emulsified oil micelles disappears; The collision with each other gradually separated from the water reunion. Re-use of B agent (organic polymer coagulant) of the strong bridge and roll effect, the formation of floc. The flocculation can be separated from the water body quickly and efficiently by the process of pressurization, aerating, dosing, mixing, releasing, flotation and sedimentation, and then through adsorption, blocking and other physical reactions. purpose. The equipment covers an area of less, low investment; processing efficiency, speed; equipment stable operation, good impact resistance, easy maintenance, low operating costs.
Description of process design：
1 Wastewater into the original regulation of the first pool, after adjustment, the water into the treatment system; regulation of sediment under the pool of solid material, need regular treatment, some of the mud pump, transported to the sludge concentration tank. After the concentration, the sludge enters the dewatering machine to carry on the slag processing, the filtrate uses the water pump to deliver to the sedimentation pond carries on processing. In the adjustment pool, the installation of aeration aeration equipment, the need to deal with sludge, ventilation, so that settling at the bottom of the sludge is blown floating in aqueous solution, and then pumped away with mud; as part of the wastewater containing oil and other solid , May not be able to float all, still need to be handled manually. Use of aeration aeration equipment, you can clear most of the sludge in the adjustment pool to reduce the workload of artificial cleaning, artificial cleaning cycle to extend.
2 Wastewater into the treatment system, the first use of the original sedimentation tank, the natural settlement, so that large particles of solid sediment in the bottom of the pool, small particles of suspended solids and colloidal particles dissolved in water. As part of the oil floating in the water, to be used inclined plate oil separation method to effectively separate the oil and oil, increase oil separation facilities, sedimentation tank separated from the oil regularly transported away.
3 After settling and oil after the treatment of waste water into the pool and adjust the pH value to facilitate subsequent processing. After pretreatment of water samples, suspension oil content is greatly reduced, large particles of solids left in the bottom, the water contains part of the emulsified oil, small particles of suspended solids and colloidal particles.
4 After pretreatment of water samples, with the pump into the dissolved air flotation system, first into the dissolved gas tank, into the air, so that the tank to maintain a certain pressure, while adding inorganic flocculant A agent, the three-phase mixing , Effective flocculation of organic matter.
5 From the dissolved gas tank out of wastewater into the air tank, no pressure to open, while adding organic polymer flocculant B agent, so that the formation of floc-shaped floc, sludge generated by the scraping machine to sludge concentration tank. After the concentration, the sludge enters the dewatering machine to carry on the slag processing, the filtrate uses the water pump to deliver to the sedimentation pond carries on processing. After the treatment of dissolved air flotation system, most COD can be removed, oil and suspended solids have been effectively treated, pollutants have been greatly reduced.
6 Floating tank into the buffer tank, with the pump into the filter tank, after filtration, removal of residual oil and suspended solids. At the same time you can view the China Sewage Treatment Engineering Network more technical documentation.
7 Filter tank effluent can be said to have reached the discharge standard, you can efflux or comprehensive utilization.
8 Activated carbon adsorption tower to retain one, usually do not, in the event of abnormal circumstances to use.
9 Filter tank in the long-term use, the need for backwash; backwash using automatic backwash system, backwash water using buffer tank water. After backwashing the water raised to the settling tank by lifting pump for processing.
10 Into the buffer tank, such as CODcr wastewater does not meet the standards, can enter the biochemical reaction tank for processing. There is aeration system in the bottom of the reactor to ensure oxygen supply. The tank is equipped with contact filler, which is biological contact oxidation tank biofilm carrier, is the biological oxidation of the smooth guarantee.