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Treatment method for wastewater in adipic acid production

A technology for producing wastewater and adipic acid, which is applied in natural water body treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of reducing the dosage and energy consumption, controlling the operation and processing costs, and simplifying the process flow

Active Publication Date: 2012-06-27
李开明
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Problems solved by technology

At present, domestic adipic acid production wastewater treatment methods are mainly incineration, concentration and flakes, or mixed with large sewage for treatment, but the former is complicated in installation, high in cost and easy to cause secondary pollution, and the latter is difficult for adipic acid production enterprises of general scale. use
[0004] With the continuous development of technology, sewage biological treatment technology has gradually been widely used, but for the treatment of adipic acid production wastewater, due to heavy metal Cu pollution, extremely low carbon-nitrogen ratio (COD / TN) and high concentration of organic matter, biological treatment The application of technology has the problems of heavy metal toxicity, difficulty in denitrification, and emission standards are still difficult to meet

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  • Treatment method for wastewater in adipic acid production

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Embodiment Construction

[0018] The steps of the present invention are:

[0019] (1) Pretreatment: Adjust the raw water (pH is about 1) to about pH=6.2, and use iron salt + PAM for coagulation and sedimentation; the effluent is sent to the deployment pool, supplemented with trace elements and inorganic phosphorus sources, so that the nutrient ratio meets COD Cr : P=200-300: 1, now the carbon-nitrogen ratio (COD / TN) of waste water is 3~5;

[0020] (2) Anaerobic treatment: send the pre-treated adipic acid production wastewater into the anaerobic reactor, control the water temperature at 35°C±2.5°C, and the concentration of VFA is less than 10mmol / L; the three phases are separated by adjusting the pH of the influent The pH of the effluent at the device is 8.0-8.5; the organic load of the influent is greater than 2.5kgCOD / m 3 d, the residence time is more than 30h, and the internal reflux flow is controlled so that the rising flow rate is not less than 1.0m / h; 80% of TN in the wastewater is removed in th...

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Abstract

The invention relates to a biological treatment method for wastewater in adipic acid production, which adopts anaerobic + A / O coupling and comprises the following steps: (1) pretreatment: adjusting the pH of raw water to be 6-6.5, and adding coagulants and coagulant aids for coagulation and sedimentation; and delivering the wastewater into a mixing tank after precipitation to supplement trace elements and inorganic phosphorus, and making the nutrition of the mixed wastewater comply with the requirement that the ratio of CODCr to P is (200-300):1; (2) anaerobic treatment: making the pretreatedwastewater subject to anaerobic reaction with the water temperature of 35 DEG C plus or minus 2.5 DEG C and the VFA (volatile fatty acid) concentration of less than 10mmol / L; and adjusting the pH of the added water to make the pH of the anaerobic effluent 8.0-8.5; (3) A / O treatment: adding the wastewater into an A / O reactor after anaerobic treatment to supplement inorganic phosphorus with the ratio of CODCr to N to P being 100:5:1; and controlling the pH value to be 7.0-9.0 at the room temperature, and the MLSS (mixed liquor suspended solids) value to be above 3000mg / L, and thus discharging the water after precipitation and satisfaction of standards.

Description

technical field [0001] The invention relates to a treatment method for industrial waste water, in particular to a biological treatment method for high-concentration organic waste water with high nitrogen content and heavy metal Cu pollution in adipic acid production plants. Background technique [0002] Adipic acid, also known as fatty acid, is the second largest dicarboxylic acid in the industry, and is often used as a raw material for synthesizing high polymers. Because of its good market prospects, many companies are preparing to build adipic acid production device. The wastewater discharged during the production of adipic acid (hereinafter referred to as adipic acid production wastewater) is a high-concentration organic wastewater with high nitrogen content and heavy metal Cu pollution. The carbon-nitrogen ratio (COD / TN) is as low as 3-5, which is difficult to treat. One of the industrial wastewater. [0003] In recent years, with the continuous strengthening of the co...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36
Inventor 李开明
Owner 李开明
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