Method for processing sewage with high-concentration phenol and ammonia

A high-concentration, sewage technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of excessive discharge of coal chemical wastewater and reduce incomplete separation and loss Small amount, good treatment effect

Active Publication Date: 2013-12-25
HENAN DRAGON INTO COAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]Due to the existence of the above problems, there is currently no mature, reliable, and stable process that enables the vast majority of coal chemical wastewater to be continuously a

Method used

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  • Method for processing sewage with high-concentration phenol and ammonia

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 16522 mg / L, free ammonia 1334 mg / L, fixed ammonia 1451 mg / L, CO 2 1625 mg / L, pH value is 7.8, water temperature is 75°C, flow rate is 55 t / h, press figure 1Process shown. The extraction tower adopts a packed tower, the feed ratio of backwater to wastewater is 1:4, the volume ratio of extractant butyl acetate to wastewater is 1:8, the temperature at the top of the deacidification tower is 29°C, the pressure is 0.3MPa, the temperature at the bottom of the tower is 90°C, and the pressure is 0.35 MPa, the reflux ratio is 0.4. The pressure at the top of the deamination tower is 0.3MPa, the temperature is 95°C, the pressure at the bottom of the tower is 0.9MPa, and the temperature is 160°C; the pressure at the top of the solvent recovery tower is 0.15MPa, the temperature is 95°C, the temperature at the botto...

Embodiment 2

[0028] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 6510 mg / L, the free ammonia is 2130 mg / L, the fixed ammonia is 1640 mg / L, and the CO 2 5054 mg / L, pH value is 8.4, water temperature is 78°C, flow rate is 47 t / h, press figure 1 Process shown.

[0029] The extraction tower adopts a packed tower, the feed ratio of backwater to wastewater is 1:3.4, the volume ratio of extractant butyl acetate to wastewater is 1:6, the temperature at the top of the deacidification tower is 33°C, the pressure is 0.35MPa, the temperature at the bottom of the tower is 100°C, and the pressure is 0.45 MPa, the reflux ratio is 1:3.5. The pressure at the top of the deamination tower is 0.45MPa, the temperature is 125°C, the pressure at the bottom of the tower is 1.1MPa, and the temperature is 150°C; the pressure at the top of the solvent recovery tower is 0.18MPa, the temperatur...

Embodiment 3

[0031] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 5520 mg / L, the free ammonia is 3310 mg / L, the fixed ammonia is 2620 mg / L, and the CO 2 5054 mg / L, pH value is 8.8, water temperature is 83°C, flow rate is 70 t / h, press figure 1 Process shown.

[0032] The extraction tower adopts a packed tower, the feed ratio of backwater to wastewater is 1:4.9, the volume ratio of extractant butyl acetate to wastewater is 1:5, the temperature at the top of the deacidification tower is 22°C, the pressure is 0.45MPa, the temperature at the bottom of the tower is 108°C, and the pressure is 0.55 MPa, the reflux ratio is 1:3.8. The pressure at the top of the deamination tower is 0.28MPa, the temperature is 130°C, the pressure at the bottom of the tower is 1.15MPa, and the temperature is 190°C; the pressure at the top of the solvent recovery tower is 0.11MPa, the temperatu...

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Abstract

The invention discloses a method for processing sewage with high-concentration phenol and ammonia. According to the method, ammonia, phenol and acid gases in sewage are eliminated, the processing effect is good, efficiency is achieved, and high performance cost ratio is achieved. Butyl acetate is used as extraction agents, the recovery rate is high, energy is saved, efficiency is high, and the performance cost ratio is high. Phenol concentration of the extracted sewage can be reduced to be smaller than the phenol concentration required by biochemical treatment water, separation is more thorough through a double-tower structure, and the defect of not thorough separation through a single tower is reduced, extraction in the counter-current extraction method is more efficient, separation is more thorough, and the method is worthy of popularization and application.

Description

technical field [0001] The invention relates to a method for treating coal chemical wastewater (including coal coking wastewater, coal gasification wastewater, and coal upgrading wastewater), in particular to a method for treating wastewater containing high concentrations of phenol and ammonia. technical background [0002] The process of using coal as raw material through chemical processing to convert coal into gas, liquid, solid fuel and other coal-based chemicals and coal-processed products is called coal chemical industry. In the process of coal chemical processing, more waste water containing phenol, ammonia and acid gas will be produced, mainly for washing high-temperature gas water. For this type of wastewater, a chemical separation process must be adopted first to remove most of the phenol, ammonia, and acid gases before it can be sent to biochemical treatment until it reaches the standard before it can be discharged. However, most of the existing treatment schemes...

Claims

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Application Information

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IPC IPC(8): C02F9/10
Inventor 白太宽王洪博周景龙杨孔林徐丹
Owner HENAN DRAGON INTO COAL TECH CO LTD
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