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Coal chemical wastewater pretreatment process and device

A technology of coal chemical wastewater and pretreatment device, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve the problem of low value of recycled products, large loss of extractant and large equipment investment. and other problems, to achieve the effect of being conducive to ecological environmental protection, improving biodegradability, and reducing investment and operating costs

Active Publication Date: 2015-12-23
广东先能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent extraction method is direct extraction and dephenolization, which has the advantages of simple operation and high extraction rate of phenolic substances in wastewater, but there are problems such as large equipment investment and large loss of extraction agent.
The use of cheap solid activated carbon and fly ash has the advantage of low cost for the treatment of phenolic wastewater, but its regeneration is difficult and easy to cause secondary pollution
In addition, there is another way to convert the phenols in the wastewater into phenolic sodium salts with low economic value through technical means, or pickling the phenolic sodium salts to recover high-value phenolic substances. Although the operating equipment is simple and the treatment efficiency is high, the value of recovered products is low, the operating cost is high, and it is easy to produce high-concentration brine to cause secondary pollution

Method used

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  • Coal chemical wastewater pretreatment process and device
  • Coal chemical wastewater pretreatment process and device
  • Coal chemical wastewater pretreatment process and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] See image 3 , is a schematic diagram of the device structure of the resin adsorption and solvent regeneration process in this embodiment. In this embodiment, the resin adsorption adopts three-stage resin adsorption pools connected in sequence. The waste water inlet in the first-stage resin adsorption pool 2 is connected to the filtered water storage tank 1 through the pipeline and the waste water lifting pump 31, and the waste water overflow port passes through the waste water overflow. Pipe one 11 is connected to the waste water inlet of the secondary resin adsorption pool 3, and the solvent regeneration liquid inlet is connected to the solvent regeneration liquid overflow port of the secondary resin adsorption pool 3 through the solvent regeneration liquid overflow pipe two 21, and the solvent regeneration liquid overflows The pipe three 22 is connected to the rectification tower through the regeneration liquid storage tank 23 and pipelines; the first-stage resin ads...

Embodiment 2

[0073] The device adopted in this embodiment is the same as that of Embodiment 1, and the waste water pretreatment process is:

[0074] During the resin adsorption process, the raw water COD of coal chemical industry wastewater is 21370mg / L, and the volatile phenol is 3852mg / L. Under the condition of pH=8.7, the treatment capacity is 10BV / h (BV is the resin volume). After filtration and resin adsorption, COD is 2498mg / L, removal rate is 88%, volatile phenol is 262mg / L, removal rate is 93%.

[0075] The resin regeneration process is basically the same as in Example 1.

Embodiment 3

[0077] The device adopted in this embodiment is the same as that of Embodiment 1, and the waste water pretreatment process is:

[0078] In resin adsorption, the raw water COD of coal chemical industry wastewater is 21370mg / L, and the volatile phenol is 3852mg / L. Under the condition of pH=3, the treatment capacity is 15BV / h (BV is the resin volume). After filtration and resin adsorption, the COD It is 2675mg / L, and the removal rate is 87.4%, and the volatile phenol is 295mg / L, and the removal rate is 92.3%.

[0079] The resin regeneration process is basically the same as in Example 1.

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Abstract

The invention relates to a coal chemical wastewater pretreatment process and device. The process includes: filtering coal chemical wastewater, then subjecting the wastewater to adsorption in a multistage resin adsorption pool; increasing the wastewater BOD5 / CODcr value from less than 0.2 of raw water to more than 0.53; conducting ammonia distillation and separation and recovery of regenerated solvent by a multifunctional rectification tower to an effluent ammonia nitrogen content of less than 150mg / L; after resin adsorption saturation, performing regeneration by solvent regeneration technique, subjecting the solvent regeneration liquid to a rectification tower to recover the regenerated solvent, conducting separation to obtain the regenerated solvent with purity of more than 95% for recycling and a crude phenol product at the same time. According to the invention, the multistage stirring resin adsorption pool is employed to pretreat coal chemical wastewater, on the one hand the pollutant concentration can be reduced, the biodegradability of wastewater is greatly improved, and wastewater can directly enter the subsequent biochemical process to undergo treatment; and on the other hand, phenolic substances with economic value can be recovered. The cyclic regeneration solvent is employed to perform staged countercurrent desorption on resin, thus improving the resin regeneration rate and the utilization rate of regenerated solvent, shortening the technological process, and saving the equipment investment cost.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a coal chemical wastewater pretreatment process and device. Background technique [0002] Coal chemical industry wastewater is a kind of industrial wastewater with high concentration and refractory degradation. It contains high COD, ammonia nitrogen and phenolic pollutants. It has poor biodegradability and is difficult to treat. At present, there is no mature and complete treatment process. High concentration of ammonia nitrogen and phenolic substances have high recovery and utilization value. Therefore, in sewage treatment, priority should be given to resource recycling of valuable substances, and then the harmless treatment of waste water. [0003] At present, the treatment process of coal chemical wastewater is pretreatment of oil removal, phenol removal, and ammonia distillation. However, the wastewater after the pretreatment process still has high COD and volat...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/34
Inventor 张立涛安路阳马力周铭潘雅虹
Owner 广东先能环保科技有限公司
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