Technique for processing dyeing wastewater through organic matter degradation and denitrogenation

Abstract

The invention relates to organic substance in dyeing waste water degradating and denitrogen processing technology. pH value of waste water is adjusted to 6-10, chemical aerobic quantity to 800-1200 mg / l, the waste water is pumped into pressure-type biological contact oxidation tower by pressurizing pump, at the same time, air is led passing through fluidic aeration unit and rapid dissolved in water. In condition that pressure in tower is kept in 0.2-0.5 Mpa, dissolved oxygen in tower achieves 5-6mg / l, to make waste water contact with microbe membrane for 2.5-3 hours and to realize organic substance in waste water degradating and denitrogen. By pressure-type biological contact oxidation tower, residual air released from water is used to direct airfloat separate mud and water to achieve the requirement of purity.

Description

technical field [0001] The invention relates to a treatment method for industrial wastewater, in particular to a treatment process for organic matter degradation and denitrification of printing and dyeing wastewater. Background technique [0002] In my country's industrial wastewater, printing and dyeing wastewater accounts for a large proportion. Printing and dyeing wastewater mainly contains dyes, pastes, additives, oil agents, acids and bases, fiber impurities and inorganic salts, etc., with complex components, high concentration, high chroma, It is one of the main harmful wastewater commonly encountered in our country. Printing and dyeing wastewater is discharged into rivers and water bodies, which hinders the transmission of sunlight in the water and is not conducive to the photosynthesis of aquatic plants. Reduce the bait of aquatic organisms, reduce the dissolved oxygen in water, and affect the growth and survival of aquatic organisms such a...

AI Technical Summary

Problems solved by technology

The physical adsorption method refers to the method of using adsorbents such as activated carbon, silicon polymer, and kaolin to absorb dyes in wastewater. This method is suitable for soluble dyes, requires less equipment investment, and has good COD and BOD removal effects. However, it is difficult to clean activated carbon after adsorption, so The cost is high, and the adsorption capacity of some macromolecular dyes is not enough; the chemical method is to convert special pollutants into insoluble forms by adding chemicals to adsorb on insoluble solids, or to oxidize pollutants into biologically Degraded compounds, or under certain conditions, completely convert pollutants into CO2 and water. If the chemical method is not properly treated, secondary pollution will occur, and the ultimate goal of pollution control will not be achieved; the physical and chemical method uses inorganic and organic chemical flocculation Agents, such as basic aluminum chloride PAC and polyacrylamide PAM, etc., the colloidal dyes produced by its hydrolysis are suitable for insoluble and insoluble dyes, and the treatment effect of water-soluble dyes is generally poor, and it will produce secondary chemical sludge. pollution, and the chroma removal rate is not satisfactory; biochemical method is a method commonly used in printing and dyeing factories at present, and its treatment cost is low. The organic matter in the wastewater is decomposed into inorganic matter. Among them, the biological contact oxidation method is easier to operate than the activated sludge method, and the microorganisms are attached to the filler to grow. The biomass is large, the impact load resistance is strong, and there is no sludge swelling. It is widely used in printing and dyeing wastewater. processing

The large biomass of the biological contact oxidation method has high requirements for gas supply, and conventional aeration methods are difficult to meet. Dissolved oxygen can generally reach 2.5~3.5mg / L when the air-water ratio is 15~20:1, and the biofilm activity is poor.

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