On the printing and dyeing wastewater treatment, technology and policy of the treatment process affirmed: the main biological treatment, chemical treatment, supplemented by biological treatment and physical and chemical treatment of a combination of integrated management approach should not be used as a single physical and chemical processing unit as a stable Compliance emission management processes. Because of the need for continuous operation of biological treatment, or can not meet the standard requirements. The time to stop when a single chemical treatment route will not be used and recommended.

1 biological method of application

Due to the variability of printing and dyeing wastewater, the biological treatment effect sometimes can not achieve very satisfactory results. Therefore, the development of adaptable bacteria, to improve the biological treatment effect, and to make the wastewater treated to achieve the requirements of reuse, will be the main target of future biological research. The new biological agents are the following:

(1) enzyme preparation: the use of biological enzyme preparation for wastewater treatment, purification of the environment than other biological high efficiency, fast, good water, does not produce secondary pollution. Enzymes for the treatment of printing and dyeing wastewater laccase, lignin peroxidase, alkalophilic enzymes. In the presence of lignin and other peroxidases, the color removal rate of laccase can be increased to 75%.

(2) Wastewater decolorization microbial preparation: The microorganisms in the activated sludge of the sewage treatment plant are separated and purified to extract microorganisms with good decolorization effect on the dye and culture the same. Activated sludge is rich in microbial species, including bacteria, fungi, micro-animals and other different types of biological species, microorganisms in activated sludge to form an ecosystem, in this system to autotrophic microorganisms. Bacteria inhabiting the organism in the environment ten, and bacteria will become bait for some primitive animals or later animals, the protozoa also called each other prey, different metazoans may also be in different trophic levels of many kinds of micro Cattle form a complex food web.

Five kinds of high efficient bacteria isolated from Institute of Microbiology, Zhongtong Academy of Science have decolorization and degradation ability on dyes such as Acid Red B2GL, Acid Medium Brown B, Acid Blue B and Acid Medium Yellow GG. Anaerobic bacteria or aerobic bacteria Seed system, the treatment of simulated dyeing wastewater, decolorization rate can reach 85% to dagger. Huazhong University of Science and Technology, Chinese Academy of Sciences Institute of Microbiology and China Textile Industry Design Institute and other units isolated hundreds of strains of decolorization, dehalogenation halogen and PVA degradation bacteria added to the wastewater treatment tank, the decolorization rate of 80%, PVA removal rate of 75% to 90 %, Much higher than normal.

(3) Biological flocculants: Compared with inorganic and organic synthetic polymer flocculants, biological flocculant has many unique properties and advantages:

â‘  easy solid-liquid separation, the formation of less sediment;

â‘¡ easy to be soil degradation, non-toxic harmless, high safety;

â‘¢ no secondary pollution;

â‘£ adapt to a wide range;

⑤ with turbidity and decolorization performance;

â‘¥ some biological flocculants also have the pH value conditions, thermal stability, less dosage and so on.

It is predicted that the extensive nature of biological flocculant flocculation activity will completely eliminate the pollution of a reality, most or all of it to replace the general trend of synthetic polymer flocculant. The bioflocculants now used in the treatment of printing and dyeing wastewater are PFIOI (for desizing wastewater containing carboxymethylcellulose), MF-3 and NA7 (for decolorization of liquor) and NOC-1 Recovery of sedimentation performance of activated sludge).

2 oxidation of the application

(1) wet air oxidation method:

Wet Air Oxidation (WAO) is an organic and inorganic reducing substance which is dissolved in or suspended in the waste water at high temperature (175-350 C) and high pressure (2.0-20.67 MPa) In the direct oxidation of carbon dioxide and water wastewater treatment method.

It does not produce biological sludge and high concentrations of waste, adding catalyst can effectively improve the efficiency of the wet air oxidation. At present, this method has been successfully applied to the treatment of industrial wastewater such as printing and dyeing.

(2) Photochemical oxidation:

â‘  The use of solar energy resources is one of the important ways for the development of circular economy in the world now and in the future. Photochemical water treatment methods can be summarized into the following categories: direct photolysis, UV light / oxidizer (UV / H, O, UV / Ol, UV / HzOz / Catalytic oxidation [light / Fenton, UV / Fe (m) -H, O, complex system] and multi-phase photocatalytic oxidation (semiconductor photocatalysis). Their common feature is the oxidation of biologically active free radicals, such as hydroxyl radicals, to degrade the mineralized organic matter. Such methods are also known as Advance Oxidation Techniques (AOTs).

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