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Process for crushed coal pressurized gasification industrial wastewater deep processing and high recovery rate

A technology for pressurized gasification of crushed coal and industrial wastewater, which is applied in the direction of heating water/sewage treatment, water/sewage treatment, multi-stage water/sewage treatment, etc. High cost and other issues, to achieve the effect of low operating cost, reduced processing costs, and reduced investment and operating costs

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

AI Technical Summary

Problems solved by technology

[0007] Based on the above processes, for large-scale pulverized coal pressurized gasification projects, the wastewater discharge volume is large, and the scale of advanced treatment and reuse is often thousands of tons per hour. , high operating costs, unstable operation and other common factors; at the same time, from the perspective of zero discharge of wastewater, it is necessary to minimize the high investment and high cost of the terminal evaporation crystallization device. Only by further improving the recovery rate of the front stage and reducing the design scale of the evaporation crystallization device, So as to solve the environmental protection and economic pressure of the enterprise as a whole

Method used

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  • Process for crushed coal pressurized gasification industrial wastewater deep processing and high recovery rate

Examples

Experimental program
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Effect test

Embodiment 1

[0046] (1) softening clarifier

[0047] Biochemical tail water (COD: 120mg / L, TDS: 3000mg / L, total hardness: 200mg / L, color 50 times, turbidity: 10, bicarbonate: 112mg / L) enters the lime softening and clarification tank, according to the wastewater Lime is added to the content of bicarbonate in the water according to the molar ratio of 1.1:1, and PAC coagulant is added. The dosage of coagulant is 20mg / L wastewater. The hydraulic retention time of the lime softening clarifier is 2h and the pH is 9. . The bicarbonate of calcium and magnesium ions reacts to form carbonate precipitate, which is removed after clarification. The total hardness removal rate is 55%, and the total hardness is 90mg / L. The softened clarifier effluent enters the multi-media filter.

[0048] (2) Multi-media filter

[0049] The effluent from the softening and clarification tank passes through the multi-media filter, the filter material is anthracite, the working pressure of the filter is 0.35MPa, and the...

Embodiment 2

[0059] (1) softening clarifier

[0060] Biochemical tail water (COD: 150mg / L, TDS: 3600mg / L, total hardness: 400mg / L, color 60 times, turbidity: 15, bicarbonate: 250mg / L) enters the lime softening and clarification tank, according to the wastewater Lime is added to the content of bicarbonate in the water according to the molar ratio of 1.15:1, and PAC coagulant is added. The dosage of coagulant is 23mg / L wastewater. The hydraulic retention time of the lime softening clarifier is 2h and the pH is 9.1 . The bicarbonate of calcium and magnesium ions reacts to form carbonate precipitate, which is removed after clarification. The total hardness of the effluent is 160mg / L, and the total hardness removal rate is 60%. The softened clarifier effluent enters the multi-media filter.

[0061] (2) Multi-media filter

[0062] The effluent from the softening and clarification tank passes through the multi-media filter, the filter material is anthracite, the filtering working pressure is 0...

Embodiment 3

[0072] (1) softening clarifier

[0073] Biochemical tail water (COD: 200mg / L, TDS: 4500mg / L, total hardness: 600mg / L, color 80 times, turbidity: 20, bicarbonate: 420mg / L) enters the lime softening and clarification tank, according to the wastewater Lime is added to the content of bicarbonate in the water according to the molar ratio of 1.2:1, and PAC coagulant is added. The dosage of coagulant is 25mg / L wastewater. The hydraulic retention time of the lime softening clarifier is 2.5h, and the pH is 9.3. The bicarbonate of calcium and magnesium ions reacts to form carbonate precipitate, which is removed after clarification. The total hardness of the effluent is 220mg / L, and the total hardness removal rate is 63%. The softened clarifier effluent enters the multi-media filter.

[0074] (2) Multi-media filter

[0075] The effluent from the softening and clarification tank passes through the multi-media filter, the filter material is anthracite, the working pressure of the filter...

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Abstract

The invention relates to a process for crushed coal pressurized gasification industrial wastewater deep processing and high recovery rate. The process is characterized by feeding biochemical wastewater into a lime softening clarifier, adding lime and coagulant to enable the total hardness removal rate to be 50 percent or over 50 percent, sequentially passing through a multi-media filter, carrying out ultrafiltration and special resin adsorption, passing through a reverse osmosis device and a concentrated water processing device to produce fresh water, and recycling the fresh water for production. The process for crushed coal pressurized gasification industrial wastewater deep processing and high recovery rate has the advantages of low investment, low operation cost and high recovery rate.

Description

technical field [0001] The invention belongs to a wastewater treatment method, in particular to a process for advanced treatment and efficient recovery of wastewater produced in the pressurized gasification industry of crushed coal. Background technique [0002] In my country, coal-based natural gas is an important supplement to conventional natural gas. It is widely used in industry, transportation, and urban residents. It is a clean energy source that is conducive to improving people's living standards and environmental protection; Synthetic methanol, etc.) is a raw material for the synthesis of various products such as liquid fuels, and occupies a very important position in the coal chemical industry. Since the "Twelfth Five-Year Plan", the country has successively issued a number of policies to support the development of the coal deep processing industry. Coal-to-gas is in line with the development trend of clean and efficient conversion of coal, and also helps to meet th...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/04C02F1/285C02F1/42C02F1/441C02F1/444C02F1/52C02F9/00C02F2001/425Y02A20/131
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
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