Dye waste water treatment system

Abstract

The invention provides a dye waste water treatment system which sequentially comprises a physico-chemical pretreatment system, an anaerobic tank, an aerobic tank and an advanced oxidation treatment system; dye waste water to be treated firstly enters into the physico-chemical pretreatment system to remove part chromaticity, sulphate and COD in the dye waste water, so as to ensure the pH, the alkalinity and the proper sulfate concentration which are needed by high-efficiency and stable running of later stage of anaerobic technique; after that, the dye waste water enters into the anaerobic tankto have anaerobic reaction and then enters the aerobic tank to have aerobic reaction; finally, the dye waste water enters into the advanced oxidation treatment system to remove the residual chromaticity and organic matter hard to degraded in the aerobic effluent as well as intermediate metabolite generated in the process of biological treatment. When being used for treating the dye waste water, especially the waste water having high salinity, sulfate, chromaticity and COD as well as higher concentration organic matter hard to degraded, the combined system has good treating effect and ensures the finally yielding water to reach the first-grade standard in GB4287-92 pollutant emission standards for textile dyeing and finishing industry.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a dye waste water and other waste water treatment systems 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 also 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 u...

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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 has a large dosage and high cost, and cannot reach the pH and alkalinity 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 large dosage and high cost. For high-concentration dye wastewater, especially for high-salinity wastewater , high sulfate, high chroma, high COD, and dye wastewater containing high concentrations of refractory organic matter, the treated effluent often fails to meet the first-level standard in the "GB4287-92 Discharge Standard of Pollutants for Textile Dyeing and Finishing Industry"

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