Dye waste water treatment method

Abstract

The invention provides a dye waste water treatment method, comprising a materializing pre-treatment, an anaerobic treatment, an aerobic treatment, and an advanced oxidation treatment carried out in sequence, wherein the method comprises the steps of conducting a materializing pre-treatment to the object dye waste water to get rid of a part of chromaticity and COD for the anaerobic treatment and aerobic treatment, and then conducting an advanced oxidation treatment to the water discharged from the aerobic treatment to finally remove the degradation-refractory pollutant at the end of the waste water treatment and the intermediate metabolized substances produced in the process of biological treatment. Through the combined process of materializing pre-treatment, anaerobic treatment, aerobic treatment and advanced oxidation treatment, the invention can effectively treat difficultly degraded dye waste water and reduce the operation cost, thereby being capable of standardizing the indexes such as COD and chromaticity of the discharged water to the national norm simultaneously, solving the domestic current situation of difficulties in treating dye waste water, and being capable of meetingthe requirements of upgrading and restructuring the sewage treatment plant according to the increased standard of environment protection in the future.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for treating dye waste water and other waste water with high salinity, high sulfate, high chroma, high COD and high concentration of refractory organic matter. Background technique [0002] Since the British W.H.Perking made the first synthetic dye aniline violet in 1857, the dye industry has become one of the important industries in the fine chemical industry and plays an important role in the national economic life. With the development of the dye industry, dye wastewater has been recognized as one of the main sources of water pollution, and environmental issues have thus become an important factor restricting the development of the dye industry. Dye wastewater not only has a specific color, but also has a complex structure, is difficult to break, has low biodegradability, and most of them are potentially toxic. The fate in the environment depends on many...

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Problems solved by technology

[0005] (2) The basic raw materials for dye production are organic substances such as benzene series, naphthalene series, and anthraquinone series. The product yield is low, and the dye loss rate during the production process is about 2%, resulting in a high COD concentration in the wastewater, generally up to 1000~ 73000mg / L

And most importantly, although some organic matter in dye wastewater is biodegradable, BOD 5 The / COD ratio is generally low, and the biodegradability is poor, and some substances even have toxic effects on microorganisms

[0006] (3) Most of the wastewater is acidic, and some are alkaline

[0008] (5) Due to the characteristics of many varieties, long processes and many changes in the dye production process, the water quality and quantity of wastewater fluctuate greatly

At present, the combined multi-stage treatment process combining physical chemistry or chemical methods mostly adopts the method of physical and chemical pretreatment and anaerobic-aerobic combined treatment. The single method of coagulation and sedimentation is large in dosage and high in cost, and cannot reach the pH, alkalinity and appropriate sulfate concentration required for subsequent anaerobic treatment

Some combined multi-stage treatment processes also use coagulation-sedimentation method for post-treatment after aerobic treatment, and the single method of coagulation-sedimentation for post-treatment requires a large amount of medicine and high cost, and the treated effluent cannot meet the requirements of "GB4287-92 textile dyeing The first-level standard in the Discharge Standard of Pollutants for the Whole Industry, and the above-mentioned combination method is not effective for the treatment of dye wastewater with high salinity, high sulfate, high chroma, high COD and high concentration of refractory organic matter. Certain toxic, harmful, and relatively stable organic compounds in wastewater are often difficult to treat by biodegradation methods. Coagulation technology mainly separates organic pollutants in water by physical means without changing the form of pollutants. and nature

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