A process for treating coal chemical wastewater

A technology for coal chemical wastewater and process, applied in the field of coal chemical industry, can solve problems such as the influence of dephenolization rate, and achieve the effects of reducing energy consumption, good effect and reducing discharge

Active Publication Date: 2021-01-19
南京佳华科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dephenolization rate is often affected by the alkalinity of wastewater, and a small amount of extractant is dissolved in water, and further treatment is required to remove the extractant in water

Method used

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  • A process for treating coal chemical wastewater

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preparation example Construction

[0039] The preparation method of modified activated carbon is: mix 100g of biomass-based activated carbon with ammonium persulfate solution with a mass fraction of 10% according to the volume ratio of 1:5, treat at 40°C for 2h, filter, wash with water to become neutral, 100 Dry at ℃ to obtain surface enriched OH - modified activated carbon.

[0040] The preparation method of the sulfonated modified adsorption resin is as follows: 200g of XAD-7 macroporous adsorption resin is washed with 100g of methanol and 150g of water at room temperature (25°C) for 30 minutes to remove impurities. Swell the resin with 400mL of absolute ethanol for 1 hour, control the temperature at 80°C, slowly add 300mL of 98%wt concentrated sulfuric acid while stirring slowly, and keep it warm for 5h after adding; quickly cool with ice water and wash to medium After drying, the sulfonic acid group-modified resin is obtained; then the resin introduced into the sulfonic acid group is soaked in 400mL of 5wt...

Embodiment 1

[0042] Control coal chemical wastewater (total ammonia nitrogen content is 8000mg / L, total phenol content is 13000mg / L, of which, volatile phenol content is 9000mg / L, non-volatile phenol content is 4000mg / L, COD is 12000mg / L, and heavy oil content is 5000mg / L) at a temperature of 30°C, and adjust the pH value to 5, first pass the wastewater into the coalescer at a flow rate of 5m / s, the working temperature of the coalescer is 65°C, and the heavy oil content in the waste water after passing through the coalescer Reduced to 96mg / L, COD value is 8560mg / L.

[0043] Then adjust the pH of the waste water to 10, pass the waste water into the rectification tower, the temperature at the top of the rectification tower is 108°C, and the pressure is 0.45MPag, and the light components are discharged from the top of the rectification tower, and the waste water after rectification treatment is self-refining The bottom of the distillation tower is discharged. After testing, the volatile phen...

Embodiment 2

[0057] Control coal chemical wastewater (total ammonia nitrogen content is 8000mg / L, total phenol content is 13000mg / L, of which, volatile phenol content is 9000mg / L, non-volatile phenol content is 4000mg / L, COD is 12000mg / L, and heavy oil content is 5000mg / L) at a temperature of 30°C, and adjust the pH value to 5, first pass the wastewater through the coalescer to remove oil at a flow rate of 4m / s, the heavy oil content in the wastewater after passing through the coalescer is 96mg / L, and the COD value is 8560mg / L.

[0058] Then adjust the pH of the waste water to 10, pass the waste water into the rectification tower, the temperature at the top of the rectification tower is 108°C, and the pressure is 0.45MPag, and the light components are discharged from the top of the rectification tower, and the waste water after rectification treatment is self-refining The bottom of the distillation tower is discharged; after testing, the volatile phenol content in the wastewater after rec...

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Abstract

The invention discloses a technology for treating coal chemical industry wastewater. The technology comprises the steps that the coal chemical industry wastewater is introduced into a coalescer for oil-water separation; the pH value of the wastewater with heavy oil removed is adjusted to be 8-11, and the wastewater is introduced into a rectifying tower, light components are discharged from the tower top of the rectifying tower, and the wastewater subjected to rectifying treatment is discharged from the tower bottom; then the wastewater is introduced into an activated carbon adsorption tower for adsorption through modified activated carbon; and the wastewater is introduced into a resin adsorption tower for absorption through sulfonated modified adsorption resin. According to the technology,main pollutants in the wastewater are treated step by step, the heavy oil in the wastewater is firstly removed through the coalescer, then non-free ammonia nitrogen is converted into free ammonia nitrogen by adding an alkali, 98% of the ammonia nitrogen is removed by adopting rectification, so that the energy consumption is low, in addition, the ammonia nitrogen index is directly qualified, and meanwhile, cresol, part of xylenol, methylbenzene are azeotropic with water so as to ejected out from the tower top, so that COD is reduced; and selective adsorption is further carried out on phenolicsubstances by using the modified activated carbon and the sulfonated modified adsorption resin, so that the wastewater reaches the standard, and therefore the energy consumption is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry and relates to a process for treating wastewater in coal chemical industry. Background technique [0002] Coal chemical wastewater has complex components, high toxicity, high chroma, and poor biodegradability. It is a kind of wastewater that is very difficult to treat. The main pollutants of coal chemical wastewater are COD, ammonia nitrogen, oil, sulfide, phenolic substances, polycyclic aromatic hydrocarbons, benzene and its derivatives, etc. Since there are too many types of pollutants to be removed in coal chemical wastewater, multi-step treatment is required, and the dephenolization process is particularly important. [0003] In the dephenolization process of coal chemical industry wastewater, solvent extraction is commonly used in industry, and the extraction agents are mainly diisopropyl ether, methyl isobutyl ketone, etc. The phenol-containing wastewater enters the upper pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/32C02F101/34C02F103/34C02F101/16
CPCC02F1/04C02F1/283C02F1/66C02F9/00C02F2101/32C02F2101/345C02F2103/34C02F2209/08C02F2209/14
Inventor 谢佳华任晓乾赵怡高云山王健贾涛高露芹魏韵
Owner 南京佳华科技股份有限公司
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