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Zero-discharge treatment process for crushed coal pressurized gasification wastewater

A crushed coal pressurized gasification and treatment process technology, applied in the direction of heating water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of difficult and difficult disposal of hazardous waste, and achieve high adsorption rate Fast, chemically stable, chemically stable and easy to regenerate

Inactive Publication Date: 2017-05-17
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method achieves the goal of zero discharge of concentrated brine in the coal chemical industry, and has a high reuse rate of concentrated brine, although the process adds purification including purification membranes, impurity removal equipment, degassing equipment, and oxidation equipment before evaporation and crystallization treatment. system, but this process is difficult to achieve the purpose of obtaining industrial salt after evaporation and crystallization of high-concentration brine containing organic matter and heavy metals, and the problem of hazardous waste is still difficult to handle

Method used

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  • Zero-discharge treatment process for crushed coal pressurized gasification wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The water quality characteristics of biochemical effluent are: PH=6, CODcr=100mg / L, conductivity=1500μs / cm, turbidity=6NTU, heavy metal ion content 3mg / L.

[0046] (1) After adding 10ppm polyaluminum chloride (PAC) and 2ppm sodium hypochlorite into the biochemical effluent, it enters the inclined plate settling tank for a residence time of 2h. After removing large particles of solid particles (SS) in the water by precipitation, it enters the upper layer It is fruit shell, with a particle size of 0.9-1.2mm, accounting for 40% of the height of the packing layer. The middle layer is quartz sand, with a particle size of 1.6-2mm, accounting for 50% of the height of the packing layer. The lower layer is quartz sand, with a particle size of 3-3.5mm. Accounting for 10% of the height of the packing layer, the operating pressure is 0.3MPa, and the filtration speed is 12m / h. The multi-media filter removes the unsettled suspended solids and colloidal particles, and enters the coiled...

Embodiment 2

[0056] The water quality characteristics of biochemical effluent are: PH=7.2, CODcr=200mg / L, conductivity=2230μs / cm, turbidity=14NTU, heavy metal ion content 5mg / L.

[0057] (1) After adding 40ppm of polyacrylamide (PAM) and 3ppm of sodium hypochlorite into the biochemical effluent, it enters the inclined plate settling tank for a residence time of 3h. After removing large particles of solid particles (SS) in the water by precipitation, it enters the upper layer for The shell, with a particle size of 0.8-1.2mm, accounts for 50% of the height of the packing layer; the middle layer is quartz sand, with a particle size of 1.4-1.8mm, accounting for 35% of the height of the packing layer; the lower layer is quartz sand, with a particle size of 2.5-3mm, accounting for 15% of the height of the packing layer, the operating pressure is 0.4MPa, and the filtration speed is 9m / h. The multi-media filter removes the suspended solids and colloidal particles that cannot be precipitated, and en...

Embodiment 3

[0067] The water quality characteristics of biochemical effluent are: PH=8, CODcr=300mg / L, conductivity=3000μs / cm, turbidity=20NTU, heavy metal ion content 8mg / L.

[0068] (1) Add 30ppm of polyacrylamide (PAM) + 70ppm of polyferric sulfate (PFS) and 5ppm of chlorine dioxide into the biochemical effluent and enter it into the inclined plate settling tank for a residence time of 4h to remove large particles in the water by precipitation After the solid particles (SS) enter the upper layer, they are fruit shells, with a particle size of 0.6-1.0mm, accounting for 60% of the height of the packing layer. The middle layer is quartz sand, with a particle size of 1.2-1.6mm, accounting for 35% of the height of the packing layer. It is quartz sand with a particle size of 2.0-3.0mm, which accounts for 5% of the height of the packing layer. The operating pressure is 0.5MPa, and the multimedia filter with a filtration speed of 5m / h removes suspended solids and colloidal particles that have n...

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Abstract

The invention provides a zero-discharge treatment process for crushed coal pressurized gasification wastewater. Most COD in bio-chemical effluent is removed with physical methods including inclined plate sedimentation, multi-medium filtration, ultrafiltration and resin adsorption, heavy metals and residual COD in concentrated water treated through two-level reverse osmosis and membrane concentration are removed through three-level resin adsorption, and finally, a crystalline salt product is obtained via an evaporative crystallization unit. Non-degradable COD in the bio-chemical effluent is removed with physical adsorption methods, the conditions of secondary pollution and increase of salt in water due to a chemical method are avoided, and the operation cost is greatly reduced. Besides, through three-level resin adsorption of the membrane concentrated water, COD and heavy metal salt ions in the concentrated water can be removed, and the crystalline salt product meets the reutilization requirement.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a zero-discharge treatment process for pressurized gasification wastewater of fresh crushed coal. [0002] technical background [0003] Coal chemical technology consumes a lot of water, and my country's coal resources and water resources are in a state of reverse distribution. The rapid development of coal chemical industry has caused an imbalance between supply and demand of regional water resources. The shortage of water resources and wastewater pollution have become key issues restricting the development of coal chemical industry. The organic pollutants contained in the crushed coal pressurized gasification wastewater include phenols, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, and sulfur, etc. It is a typical industrial wastewater containing refractory organic compounds. The state has put forward strict requirements an...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/04C02F1/286C02F1/441C02F1/444C02F1/52C02F9/00C02F2301/08C02F2303/16
Inventor 段星范辉郑笑彬崔晓曦刘航马国强陈乃尧宋乐
Owner SEDIN ENG
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