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Semi-coke wastewater treatment method combining rectification and film separation

A technology of semi-carbon wastewater and treatment methods, applied in multi-stage water treatment, water/sewage treatment, natural water treatment, etc., can solve the problems of large volume of light component concentrate, high operating cost, and difficulty in effectively degrading COD. Achieve the effect of reducing the pressure and economic burden of subsequent treatment, reducing investment and operating costs, and facilitating comprehensive utilization

Active Publication Date: 2021-12-07
榆林新沃德凯环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the Ministry of Industry and Information Technology listed semicoke (semi-coke) in the industry catalog in 2008, due to the huge market demand, the semicoke industry has developed rapidly, but environmental workers have not kept up with the research on semicoke wastewater. The pace of most of the semi-coke production enterprises that have been put into production, the problem of wastewater pollution has seriously restricted the sustainable development of semi-coke production enterprises
Regardless of the combination, there are the following problems: (1) There are many unit operation procedures and long processes, resulting in large investment, large land occupation, and high operating costs; (2) High consumption of raw materials such as sulfuric acid and caustic soda, high operating costs, and waste water in Na 2 SO 4 High concentration of inorganic salts
Because dephenolization usually requires operation at a pH value of 3.0, it is necessary to add sulfuric acid to the wastewater, while deamination requires operation at a pH value above 10.5, so it is necessary to add caustic soda to the wastewater, and the artificially added sulfuric acid and caustic soda eventually form Na2SO4 Inorganic Salt remains in the wastewater; (3) The efficiency of biochemical treatment is low, and it is difficult to reuse or discharge the effluent after treatment
It is difficult to reduce the phenol content in wastewater to less than 500mg / L through extraction and dephenolization, and the residual phenol after entering the biochemical treatment system inhibits the activity of the remaining sludge, making it difficult for the biochemical system to effectively degrade COD, and it is difficult for the biochemical effluent to be reused or meet discharge standards (4) A large amount of excess sludge is produced after biochemical treatment, forming secondary pollution, and the cost of harmless disposal of sludge is also high
[0012] After semi-coke wastewater is pretreated to separate slick oil, heavy tar and coke ash, ammonium bicarbonate and light component concentrate can be recovered by stripping and distilling deammoniation, but the volume of light component concentrate is large, and volatile phenols in the concentrate The concentration of other organic components is low, and it is difficult to use them at a high value. If the light component concentrate is further disposed of by incineration and other methods, the investment is large and the operating cost is high.
Secondly, it also affects the water reuse rate after semi-coke wastewater treatment

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  • Semi-coke wastewater treatment method combining rectification and film separation
  • Semi-coke wastewater treatment method combining rectification and film separation
  • Semi-coke wastewater treatment method combining rectification and film separation

Examples

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Embodiment 1

[0041] Example 1: A method of treating semi-coke wastewater that combines rectification and membrane separation. The semi-coke wastewater is heated to 50°C and naturally settled in a sedimentation tank for 10 hours. Bottom sediments such as heavy tar and fly ash are discharged intermittently. The pretreated wastewater is discharged, and the pretreated wastewater is stripped and distilled in the distillation tower. The steam pressure used is 0.3Mpa. The distillation tower adopts negative pressure distillation. The top pressure of the stripping distillation tower is -0.09Mpa. The dosage is 80kg. The countercurrent contact between the pretreated waste water and the steam produces mass transfer and heat transfer, and produces gas phase and raffinate; the extracted gas phase enters the ammonia recovery tank, the condensation temperature of the ammonia recovery tank is controlled at 20°C, and the pH is controlled at 7.3, and carbonic acid is formed after condensation ammonium bicar...

Embodiment 2

[0045] Example 2: A treatment method for semi-coke wastewater that combines rectification and membrane separation. Heat the semi-coke wastewater to 55°C and settle naturally in the sedimentation tank for 15 hours. Bottom sediments such as heavy tar and fly ash are discharged intermittently. Discharge the pre-treated wastewater, and carry out stripping and distillation of the pre-treated wastewater in the distillation tower. The steam pressure used is 0.1Mpa. The distillation tower adopts negative pressure distillation. The top pressure of the stripping distillation tower is -0.05Mpa. The dosage is 90kg. The countercurrent contact between the pretreated waste water and the steam produces mass transfer and heat transfer, and produces gas phase and raffinate; the gas phase produced enters the ammonia recovery tank, the condensation temperature of the ammonia recovery tank is controlled at 30°C, the pH is controlled at 8, and carbonic acid is formed after condensation ammonium bi...

Embodiment 3

[0050] Example 3: A semi-coke wastewater treatment method combining rectification and membrane separation, heating the semi-coke wastewater to 60°C and naturally settling in the sedimentation tank for 20 hours, recovering slick oil from the top of the sedimentation tank by overflowing, Bottom sediments such as heavy tar and fly ash are discharged intermittently. Discharge the pre-treated wastewater, carry out stripping and distillation of the pre-treated wastewater in the distillation tower, the steam pressure used is 0.4Mpa, the distillation tower adopts atmospheric distillation, the top pressure of the stripping distillation tower is 0.00Mpa, the steam consumption per ton of the pre-treated wastewater 100kg. The countercurrent contact between the pretreated waste water and the steam produces mass transfer and heat transfer, and produces gas phase and raffinate; the gas phase produced enters the ammonia recovery tank, the condensation temperature of the ammonia recovery tank ...

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Abstract

The invention discloses a semi-coke wastewater treatment method combining rectification and film separation. The semi-coke wastewater treatment method comprises the following treatment steps of pretreatment, steam stripping distillation, ammonium bicarbonate recovery, evaporation concentration and film separation. According to the invention, the technology of the processes of pretreatment, deamination, dephenolization and the like of the semi-coke wastewater is innovated, various pollutants in the semi-coke wastewater can be effectively removed, and the treated wastewater can be reused in a semi-coke production water consuming process or can be directly discharged. By combining a rectification technology and a film separation technology, the volume of a light component concentrated solution is reduced, the film water yield is improved, and the wastewater recycling rate reaches 92% or above. The method eliminates the conventional extraction dephenolization, biochemical treatment and other processes, and has the advantages of low investment, small occupied area, low operation cost and the like.

Description

technical field [0001] The invention relates to the field of wastewater treatment produced in the production process of coal chemical enterprises, in particular to a semi-coke wastewater treatment method combining rectification and membrane separation. Background technique [0002] Semi-coke, also known as semi-coke, is a low-volatility solid carbonaceous product obtained from low-metamorphism coal (long-flame coal, non-caking coal, weakly caking coal, etc.) through medium-low temperature (600-800°C) dry distillation pyrolysis. Semi-coke wastewater refers to a kind of industrial wastewater formed in the process of medium and low temperature carbonization, gas purification, and semi-coke steam quenching. This kind of wastewater has complex components and contains a large number of refractory and highly toxic pollutants, such as organic pollutants such as benzene series, phenols, polycyclic aromatic hydrocarbons, nitrogen-oxygen heterocyclic compounds, and inorganic pollutants...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01C1/26C02F103/34C02F101/16C02F101/34
CPCC02F9/00C01C1/26C02F2001/007C02F1/40C02F1/048C02F1/043C02F1/20C02F1/041C02F1/441C02F2103/34C02F2101/16C02F2101/345C02F2301/08C02F2209/02C02F2209/03
Inventor 李祖强高富宝张美英勇欣李刚
Owner 榆林新沃德凯环保科技有限公司