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Short-process treatment method for semi-coke wastewater

A technology of blue carbon wastewater and treatment method, which is applied in multi-stage water treatment, water/sewage treatment, natural water treatment and other directions, can solve the problems of difficult to effectively degrade COD, high operating cost, secondary pollution, etc. and settlement, lower investment and operating costs, and low operating costs

Active Publication Date: 2021-12-10
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

Method used

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  • Short-process treatment method for semi-coke wastewater
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  • Short-process treatment method for semi-coke wastewater

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0037]Example 1: A short-process treatment method for semi-coke wastewater. The semi-coke wastewater is heated to 50°C and naturally settled in the sedimentation tank for 10 hours. The oil slick is recovered from the top of the sedimentation tank by overflow and intermittently discharged from the bottom of the sedimentation tank. Heavy tar, fly ash and other bottom sediments. 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...

Embodiment 2

[0041] Example 2: A short-process treatment method for semi-coke wastewater. The semi-coke wastewater is heated to 55°C and naturally settled in the sedimentation tank for 15 hours. The oil slick is recovered from the top of the sedimentation tank by overflow and intermittently discharged from the bottom of the sedimentation tank. Heavy tar, fly ash and other bottom sediments. 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...

Embodiment 3

[0045] Example 3: A short-process treatment method for semi-coke wastewater. The semi-coke wastewater is heated to 60°C and naturally settled in the sedimentation tank for 20 hours. The oil slick is recovered from the top of the sedimentation tank by overflow and intermittently discharged from the bottom of the sedimentation tank. Heavy tar, fly ash and other bottom sediments. 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...

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PUM

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Abstract

The invention discloses a short-process treatment method for semi-coke wastewater. The short-process treatment method comprises the following treatment steps: pretreatment, steam stripping distillation, ammonium bicarbonate recovery, evaporation concentration and membrane separation. According to the invention, technologies of pretreatment, deamination, dephenolization and other processes of the semi-coke wastewater are innovated, various pollutants can be effectively removed, and the treated wastewater can be reused in a semi-coke production water consuming process or directly discharged. The method eliminates 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 waste water treatment produced in the production process of coal chemical enterprises, in particular to a short-process treatment method for semi-coke waste water. 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 such as heavy metals. High...

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
CPCC02F9/00C01C1/26C02F2001/007C02F1/40C02F1/048C02F1/20C02F1/041C02F1/441C02F2103/34C02F2101/16C02F2101/345C02F2209/02C02F2209/03C02F2209/08C02F2209/14C02F2301/08
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