Decolorization Of Dyeing Wastewater Treatment Technology At Home And Abroad, And The Trend Summary -

1. Outline Textile Printing and dyeing wastewater

, water, large, color and high and complex components in the wastewater containing dyes, sizing agent, promoter, acids, alkalis, inorganic salts and other impurities and fibers and dyes structure of amino compounds and copper, chromium, zinc, arsenic and other heavy metals, have greater toxicity. Dyeing process of the present 10-20% of the dye into the water, the serious pollution Environment . With the development of industrial dyes and dyeing processing technology, greatly improved the stability of dye structure, to the bleaching treatment more difficult, the current issue of Dyeing Wastewater with domestic wastewater treatment has become a major problem need to be resolved.

Most of the use of chemical processing and dyeing method of combining biological treatment, biological treatment using microbial degradation of dye molecules and organic matter, but the biochemical process of harmful low-molecular degradation rate, equipment investment, high running costs, therefore, the choice a simple and cost-effective approach to become the research focus Dyeing Wastewater. In addition to biochemical methods, other physical or chemical bleaching, such as chemical adsorption, oxidation reduction, ion exchange, membrane, coagulation, etc., have a lot of research and application reports, but the results do not handle very good.

2. Abroad Dyeing Wastewater Treatment Process Overview Biosorption

2.1 One of the main advantages of decolorization by adsorption of the role of dyes can be removed from the water, the dye adsorption process to retain the structure. Activated Carbon As a good adsorbent already widely used in water treatment, is still the best color printing and dyeing wastewater adsorbent, activated carbon dye selective bleaching performance of its order of basic dyes, direct dyes, acid dyes, and curing dye. Activated carbon is expensive, plus the regeneration difficult, so generally used in low concentrations of dye wastewater treatment or advanced treatment. Molecular sieve, activated aluminum, granular activated carbon (GAC), diatomaceous earth and sawdust can be used as disperse dyes 1260 of adsorbent, activated carbon to remove color and COD, but the best. With montmorillonite as adsorbents of dyeing wastewater, the decolorization rate and COD removal rates were 90% and 96.9%. The biggest problem adsorbent regeneration is difficult to achieve on-site. S. Karcher developed a new type of renewable sorbent CUCURBITURIL, it is a glycoluril and formaldehyde condensation forming a cyclic condensation product. The large number of experiments show that the toxic substance, and calcium concentration 1-100 mmol / L, the total concentration of salt solution is less than 100-1000 mmol / L, you can get a high adsorption capacity, residual color very low.

2.2 Redox decolorization With redox dyes conjugated system damage or hair color dye decolorization group is an effective way. In addition to the conventional chlorine oxidation process, the domestic and international research priorities focused on ozone oxidation, hydrogen peroxide, oxidation, electrolytic oxidation and light.

Ozone is a good bleaching oxidants, such as for wastewater containing water-soluble active, direct, cationic and acid dye decolorization rate is very high; on disperse dyes have good bleaching effect; but the other to exist in the water suspension The reduction, sulfide and Paint , Bleaching effect is poor. Matsui, etc. The results show that ozonation of azo dyes decolorization more easily. Ozone dosage and the number of the azo groups, such as for the 0.1mol / l of direct red 2S, 2S their needs directly to black ozone were 80,130 mg / l. Ozone can also be combined with other processing applications. If using FeSO4, Fe2 (SO4) 3 and FeCl3 cohesion can improve after treatment with ozone bleaching effect; ozone - Electrolysis can direct, acid dyes, the decolorization rate than ozone treatment alone increased from 25 to 40%, on alkaline and reactive increase of 10%. Ozone plus UV radiation or combination of ionizing radiation can also improve the oxidation efficiency. As the ozonation of dyestuffs and wide adaptability, decolorization efficiency, while the reduction of O3 products in wastewater and excess O3 rapidly decomposed in solution and in the air for the O2, will not cause secondary pollution to the environment. Therefore, decolorization O3 technology has some industrial applications. The main disadvantage of the current ozone oxidation is relatively high running costs.

Fenton reagent is H2O2 and FeSO4 made by mixing a strong oxidizing agents. Fenton reagent in wastewater treatment with the oxidation process, in addition to, but also the role of both coagulation and therefore a higher decolorization efficiency. In recent years, the decolorization of dyes and wastewater treatment has been increasingly widely used, traditional H2O2 oxidation by Fenton reagent are currently the form. Fenton reagent in order to fully understand all the decolorization ability, Kuo, W, G [11] covering 90% of selected varieties of common dyes simulation of representative compounds. The results showed that under acidic conditions (pH

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