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Chemical wastewater biochemical tailrace advanced treatment method

A technology for chemical wastewater and advanced treatment, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, ion-exchanged water/sewage treatment, etc., can solve the problems of stable water quality, harsh operation requirements and high cost

Inactive Publication Date: 2008-09-03
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high cost, stable water quality requirements and harsh operation requirements in the advanced treatment of chemical wastewater biochemical tail water, the present invention provides a method for advanced treatment of chemical wastewater biochemical tail water, which can effectively remove residual Organic matter, inorganic matter, etc., so that the indicators of the treated biochemical tail water meet the discharge standards, and make less investment and lower operating costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 10ml of composite functional adsorption resin NDA-88 into a jacketed glass adsorption column (Φ20×350mm). At room temperature (20-25°C), pretreat the wastewater to remove suspended impurities, adjust the pH value to about 8, and pass through the resin bed at a flow rate of 70mL / h (that is, 7 resin bed volumes per hour), with a treatment capacity of 9000mL / Batch (ie 900BV / batch). The COD of the original tail water is 188mg / L, and the COD of the effluent after resin adsorption is 60mg / L, which is colorless and transparent.

[0019] Sequentially use 40mL 6% NaOH aqueous solution and 30mL tap water at a temperature of 50±2°C to desorb and regenerate the resin bed. The desorption flow rate is 10mL / h (ie 1BV / h), and the COD desorption rate is 96.5%. Finally, the resin was washed with 40 mL of 6% hydrochloric acid and 10 mL of tap water. The desorbed first 10mL desorption solution is high concentration desorption solution. The low-concentration desorption solution (ab...

Embodiment 2

[0021] Other operating conditions are the same as in Example 1, and the flow rate of 30mL / h (i.e. 3BV / h) passes through the resin bed, and the adsorption treatment effect is as follows: the COD of the primary tail water is 188mg / L, and the COD of the adsorbed water is 46mg / L.

Embodiment 3

[0023] Other operating conditions are the same as in Example 1, and the adsorption treatment effect is as follows: the COD of the primary tail water is 226 mg / L, and the COD of the adsorbed effluent is 72 mg / L. The desorption agent is 20mL 8% NaOH aqueous solution, and the desorption rate of COD is 97.5%.

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Abstract

The invention discloses a method for the advanced treatment to chemical waste water biochemical tailwater. The method comprises the following steps: under the conditions of normal temperature and the flow quantity of 0.5 to 8BV / h, water is removed from the chemical waste water biochemical tailwater after being pretreated through a device filled with a resin adsorbent, and the water is added with alkali for neutralization and then can be discharged; the resin is desorbed and regenerated with an alkalic desorption agent and an acidic desorption agent, the flow quantity of the desorption agent is 0.5 to 3.0BV / h, advanced treatment is performed to desorption liquid with a high concentration, and desorption liquid with a lower concentration can be used for the preparation of the next batch of desorption agent for circulating and matching. Protocercal tail water COD is 120 to 250 mg / L, the COD can be reduced to below 75 mg / L through treatment, and after the COD adsorbs the resin after being saturated and regenerated through desorption, the desorption ratios are all more than 96 percent, and advanced treatment can be performed to the desorption liquid with the high concentration. With the advantages of simple process, and simple and convenient operation, the method is economic and highly efficient, and has better practicability without introducing secondary pollution.

Description

technical field [0001] The advanced treatment technology of chemical wastewater biochemical tail water involved in the present invention specifically refers to a method for treating residual organic matter and inorganic matter in the chemical waste water biochemical tail water by using a resin adsorbent. Background technique [0002] At present, my country has become a key area for global chemical transfer. The chemical industry occupies an important position in the national economy, and its industry contribution rate ranks first in the national industry. A large amount of chemical wastewater ranks first in the discharge of wastewater in various industries. [0003] The composition of chemical wastewater is complex, the concentration of organic substances, especially organic poisons, is high, the biodegradability is poor, and the water quality changes greatly. After biochemical treatment, due to the changes in water quantity and quality and the biological toxicity and biologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/42B01J49/00B01J49/60
Inventor 李爱民闫蕾张龙薛玉志钟声陆朝阳范俊
Owner NANJING UNIV
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