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Advanced treatment process for coal gasification wastewater

A coal gasification wastewater and advanced treatment technology, applied in the direction of oxidized water/sewage treatment, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve high investment cost and operation cost, pipeline blockage, and influence on catalytic oxidation tower processing effect and other issues

Active Publication Date: 2012-05-23
ENN ENVIROTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the waste water treatment process of this patent is: after Fenton oxidation, many particulate flocs will be produced. If the flocs are not treated by coagulation sedimentation, air flotation and other processes in the subsequent process, the produced particulate flocs will float in the wastewater. directly into the catalytic oxidation tower, which will affect the treatment effect of the catalytic oxidation tower and easily cause the problem of pipeline blockage
In addition, this patent uses ozone as an oxidant, which requires an expensive ozone generator, so the investment cost and operating cost are high

Method used

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  • Advanced treatment process for coal gasification wastewater
  • Advanced treatment process for coal gasification wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The process schematic diagram of this embodiment is as figure 1 shown. A company's coal gasification wastewater has a COD of about 450mg / L and a chroma of about 1000 after biological treatment. It is planned to use the advanced treatment method of the present invention for treatment. Each container R1-R7 is made of plexiglass. Among them, the volume of R1-R6 is 1.5L, cylindrical, with a stirring paddle in the middle. Wherein vessels R1 , R2 and R4 act only as vessels; whereas vessel R3 also acts as a reactor in which the Fenton oxidation takes place; vessels R5 and R6 also act as coagulators. The wastewater to be advanced treatment enters R1 from a pump (not shown), and flows into subsequent containers in sequence. R1-R6 are connected to automatic dosing peristaltic pumps, and the amount of medicine added is controlled by adjusting the speed of the pump. Precipitator T1 has a volume of 10L and is square. The volume of the catalytic oxidation reactor R7 is 5L, cylind...

Embodiment 2

[0040] The wastewater to be advanced treatment and the technological process used and each equipment are all the same as in Example 1, but the process parameters are changed: FeSO is added in the Fenton oxidation 4 ·7H 2 The amount of O is 600mg / L, H 2 o 2 The amount of water is 800mg / L, the aeration rate of R7 is 8 cubic meters of air per hour per cubic meter of reactor volume, and the hydraulic retention time of wastewater in R7 is 1.5h. , other parameters are the same as in Example 1. After 90 days of continuous operation, the COD values ​​of T1 and T2 effluent ranged from 220-240mg / L and 40-90mg / L respectively, and the chromaticity of T2 effluent was less than 50.

Embodiment 3

[0042] The equipment and process flow used in this example are the same as in Example 1, but the wastewater to be advanced treatment and some process parameters are different. In this embodiment, the aggregated coal gasification wastewater of a certain factory is treated, its COD is about 1000 mg / L, and its chroma is about 1200. Add FeSO only in Fenton oxidation in process parameters 4 ·7H 2 The amount of O is 2000mg / L, H 2 o 2 The amount of water is 2800mg / L, the aeration rate of R7 is 8 cubic meters of air per hour per cubic meter of reactor volume, and the hydraulic retention time of wastewater in R7 is 1.5h. , other parameters are the same as in Example 1. After 90 days of continuous operation, the COD values ​​of T1 and T2 effluent ranged from 240-260mg / L and 40-80mg / L respectively, and the chromaticity of T2 effluent was less than 50.

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Abstract

The invention relates to an advanced treatment process for coal gasification wastewater, which comprises the following steps of: after regulating the pH value of the wastewater with acid, adding ferrous salt and hydrogen peroxide to oxidize organisms in the wastewater; then sequentially adding a first coagulant and a second coagulant to carry out coagulation after adding alkali to regulate the pH value; after precipitating to separate out coagulation substances, oxidizing the wastewater with oxygen-containing gas under the action of a catalyst at normal temperature and under normal pressure; and optionally carrying out sand filtration.

Description

field of invention [0001] The invention relates to a treatment method for coal gasification wastewater. Background technique [0002] The application of coal as energy and chemical raw materials has been paid more and more attention. Coal gasification is a clean and efficient coal utilization method, but the coal gasification process produces a large amount of highly polluting coal gasification wastewater, which contains a variety of pollutants, such as phenol, cyanide, ammonia nitrogen and several aliphatic and aromatic compounds , it needs to be treated effectively before it can be discharged. [0003] In the field of wastewater treatment, indicators such as chemical oxygen demand (COD), ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, and chromaticity are often used to indicate the type and / or amount of pollutants in wastewater. Among them, COD, also known as chemical oxygen demand, refers to the amount of oxidant consumed when a certain strong oxidant is used to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/72C02F1/56
Inventor 李伟贾永强万新华杨延红
Owner ENN ENVIROTECH CO LTD
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