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Deep preprocessing method for crushed coal pressurized gasification industrial wastewater

A technology for pressurized gasification of crushed coal and industrial wastewater, applied in special compound water treatment, water/sewage treatment, water treatment parameter control, etc. Achieve the effect of reducing investment and operating costs, compact layout of process equipment, and improving operating environment

Inactive Publication Date: 2016-05-04
SEDIN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the pretreatment and biochemical treatment measures in the previous stage, the COD of general wastewater can be reduced to about 200mg / L, but the remaining COD indicators are mainly some refractory organic substances such as polycyclic and heterocyclic compounds, and it is difficult to continue biochemical Removal, such as directly entering the subsequent membrane treatment system, will soon lead to fouling of the subsequent membrane system, decrease in membrane flux, frequent chemical cleaning, deterioration of effluent water quality, etc., and cause serious membrane damage and greatly shorten the service life; practice It proves that in order to ensure the normal and stable operation of the back-end membrane system, the biochemical tail water must be pretreated, and the effect of pretreatment is the key to the stable operation of the membrane system, and it is also the bottleneck of the entire wastewater treatment and reuse system
[0005] At present, there are few examples of pretreatment projects before the advanced treatment of crushed coal pressurized gasification industrial wastewater. From the perspective of treatment effects and actual operation conditions, the main processes include advanced oxidation technology represented by ozone oxidation and Fenton oxidation, and activated coke. Physical adsorption technology: Among them, the ozone oxidation method has low COD removal efficiency and high power consumption, and the effect is not ideal; the Fenton method consumes a lot of chemicals, adjusts the acid and alkali twice, and produces a large amount of chemical sludge, and the salt content in the effluent increases, etc. High investment and operating costs; although active coke and other adsorption can effectively adsorb organic matter in wastewater, due to the difficulty of desorption, large-scale disposal equipment, and complicated operation, the annual consumption of adsorbents is large and the operating costs are high.
[0006] Combining the above processes, there is a certain effect on the treatment of waste water from the crushed coal pressurized gasification industry. However, for large-scale coal-to-gas projects, the discharge of waste water is large, and the treatment scale is often thousands of tons per hour. The use of these processes will inevitably lead to pretreatment Unfavorable factors such as large investment, high operating costs, and complex management greatly increase the product cost of the enterprise, and the burden on the enterprise is heavy

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  • Deep preprocessing method for crushed coal pressurized gasification industrial wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Multi-media filter

[0038] The coal gas waste water (COD: 120mg / L, turbidity 15NTU, chromaticity 50 times) from the biochemical station is passed through a multi-media filter, the filter material is anthracite, and the effluent COD: 110mg / L, the turbidity is 3NTU , chroma 45 times.

[0039] (2) The design membrane flux of the ultrafiltration device is 45L / m 2 .h, the effluent COD is 100mg / L, and the turbidity is 0.5NTU.

[0040] (3) Special resin adsorption device

[0041] The resin in the special resin device is selected from the macroporous adsorption resin (specific surface area 900m2) that has been developed for coal gas wastewater 2 / g, the characteristic pore size is 150μm, the harmonic particle size is 560-590μm), the resin filler treatment load is designed to be 6:1 (volume ratio of waste water to resin per unit time), and the effluent of the multimedia filter enters the tower body from the top of the resin adsorption tower, It flows in the gaps of the ...

Embodiment 2

[0047] (1) Multi-media filter

[0048] The coal chemical wastewater (COD: 150mg / L, turbidity 20NTU; chromaticity 60 times) from the biochemical station after passing through the multimedia filter, the filter material is quartz sand, the effluent COD: 130mg / L, the turbidity It is 4NTU, and the chromaticity is 55 times.

[0049] (2) The design membrane flux of the ultrafiltration device is 40L / m 2 .h, the effluent COD is 120mg / L, and the turbidity is 0.6NTU.

[0050] (3) Special resin adsorption device

[0051] The resin in the special resin device is a macroporous adsorption resin developed for coal gas wastewater (specific surface area 850m 2 / g, the characteristic pore size is 150μm, the harmonic particle size is 600-650μm), the resin filler treatment load is designed to be 5:1 (volume ratio of waste water to resin per unit time), and the effluent of the multimedia filter enters the tower body from the top of the resin adsorption tower, It flows in the gaps of the resin b...

Embodiment 3

[0057] (1) Multi-media filter

[0058] Coal chemical industry or coal gas waste water (COD: 200mg / L, turbidity 25NTU, chromaticity 80 times) from the biochemical station after passing through the multi-media filter, the filter material is anthracite and quartz sand, the effluent COD: 180mg / L, the turbidity is 5NTU, and the chromaticity is 70 times.

[0059] (2) The design membrane flux of the ultrafiltration device is 35L / m 2 .h, the effluent COD is 160mg / L, and the turbidity is 0.6NTU.

[0060] (3) Special resin adsorption device

[0061] The resin in the special resin device is selected from the macroporous adsorption resin developed for coal gas wastewater (specific surface area 800m 2 / g, the characteristic pore size is 150μm, the harmonic particle size is 680-710μm), the resin filler treatment load is designed to be 4:1 (volume ratio of waste water to resin per unit time), and the effluent of the multimedia filter enters the tower body from the top of the resin adsorpt...

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Abstract

The invention relates to a deep preprocessing method for crushed coal pressurized gasification industrial wastewater. The method comprises the following steps of sequentially carrying out ultrafiltration, special resin adsorption, resin desorption and desorption solution processing on wastewater subjected to biochemical processing and flocculation precipitation processing from a biochemical station. The deep preprocessing method for the crushed coal pressurized gasification industrial wastewater has the advantages of low investment, operation stability and low operation cost.

Description

technical field [0001] The invention belongs to a method for treating waste water, in particular to a method for advanced pretreatment of crushed coal pressurized gasification industrial waste water. Background technique [0002] At present, due to the serious problem of natural gas shortage in our country, there is a large market space for coal-based natural gas. Compared with other gasification technologies, crushed coal pressurized gasification technology has obvious advantages in terms of coal type adaptability, technology maturity and stability, comprehensive energy consumption ratio, methane content in gas, and investment cost, etc., and has many by-products and is economical. It has high added value and has unique advantages as a coal-to-natural gas project; however, the treatment of coal-to-gas wastewater produced by pressurized gasification of crushed coal has always been a major problem in the field of wastewater treatment at home and abroad. Aromatic hydrocarbons...

Claims

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Application Information

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IPC IPC(8): C02F9/06
CPCC02F1/001C02F1/285C02F1/444C02F1/46176C02F1/5236C02F1/66C02F1/722C02F9/00C02F2209/08C02F2303/16C02F2305/026
Inventor 郑笑彬陈乃尧范辉崔晓曦凌家华原洪波贺慧琴马国强李志博王剑李斌
Owner SEDIN ENG