Dye wastewater treatment apparatus and method thereof

Abstract

The invention discloses a dye wastewater treatment apparatus and a method thereof. Phosphorus / cyanogen (CN)-containing wastewater, gypsum wastewater, anthraquinone substance-containing wastewater and alcohol / acetic acid degradable wastewater are classified from the source, enters different devices in the apparatus according to different water properties and are treated to eliminate the pollution from the source, and the method is improved to increase the resource utilization efficiency, greatly reduce the instability and the toxicity of raw water, reduces the impact of wastewater to a biochemical system and realize strong adaptation to the sudden change of the water quality and the water volume, less residual sludge and the recycling and the long-period stable running of the apparatus. The apparatus and the method have the advantages of small investment, high treatment efficiency, stable outlet water quality, and convenience in operation.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a dye wastewater treatment device and a method thereof. Background technique [0002] The dye industry is an important basic industry of my country's social economy. It has a wide range of products. However, dye production has the characteristics of many varieties, small batches, and fast renewal. The dye products have complex processes, low output, complex components, and many dye wastewaters in the production process. The basic raw materials for dye production are benzene series, naphthalene series, anthraquinone, aniline and benzidine compounds, and they are mostly chelated with metals, salts and other substances during the production process, resulting in "three highs and one high" in dye wastewater "Low" (high COD, NH3-N and TN, high chroma, high salt content, low BOD5 / COD), which poses a serious threat to the human body and the environment. Traditional biological treatment pro...

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Problems solved by technology

[0004] (1) Most of them are based on aromatic hydrocarbons and heterocyclic compounds, etc., with chromogenic groups and polar groups, high chroma, and troublesome to handle;

[0005] (2) The concentration of organic matter is quite high (high COD), and the structure is relatively complex. Although some organic matter in wastewater is biodegradable, the B / C ratio is generally low, and the biodegradability is poor. Toxic effect;

[0007] (4) Due to the intermittent operation of dye production, there are many varieties and small batches, and the waste water is discharged intermittently, so the water quality and quantity vary greatly;

[0008] (5) High toxicity

Dye wastewater contains chemical substances such as halogenated compounds, nitro compounds, aniline and phenols, which are toxic and cannot be degraded by microorganisms;

[0009] (6) There are a certain amount of suspended particles, Fe, Ni, Cr, Pb and other heavy metal ions, if not handled properly, it will cause harm to the human body and the environment

[0010] (7) The content of ammonia nitrogen and total nitrogen in wastewater is high. The total nitrogen in wastewater is mainly composed of organic amines and heterocyclic or polycyclic nitrogen-containing organic compounds. After anaerobic reaction of these substances, the organic nitrogen in wastewater will be converted into Ammonia nitrogen substances, the treatment of wastewater with high concentration of ammonia nitrogen must have a reasonable process, and the sludge age should be reasonably controlled. If the sludge age is too short, it will not be able to enrich nitrifying bacteria, and if it is too long, it will lead to sludge aging, which cannot effectively remove ammonia nitrogen.

Its disadvantages are: first, it is not resistant to impact load, difficult to operate and control, and it is difficult to achieve the purpose of treatment; second, the wastewater contains certain toxic and harmful substances, which will have a fatal impact on the subsequent treatment process without pretreatment; Three, the nitrification and denitrification reaction effect of this method is not ideal, especially the removal rate of TN is low

Fourth, the amount of sludge is large, the consumption of raw materials is high, and the cost increases

Fifth, the traditional A2 / O process has (1) high energy consumption, and the nitrification reaction is an aerobic process, and energy consumption is required for feeding. For the pre-denitrification system, the setting of internal reflux also increases energy consumption; There must be an organic carbon source as an electron donor in the nitrification process. Although the pre-denitrification system can use the organic matter in the wastewater as a carbon source, if the C / N in the wastewater is insufficient, the denitrification effect will also be affected. The post-denitrification system It is necessary to add additional carbon sources such as methanol, resulting in a waste of resources; (3) nitrification is an acid production process, and denitrification is an alkali production process. In order to maintain the normal operation of the system, a large amount of calcium carbonate alkalinity (hydrogen oxidation) must be added. sodium or sodium carbonate), increasing operating costs

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