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Coal chemical industry wastewater zero emission treatment method and system

A technology for coal chemical wastewater and treatment methods, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, adsorbed water/sewage treatment, etc., can solve the problem of COD value difficult to reach the standard, polycyclic aromatic hydrocarbons and heterocyclic aromatic hydrocarbons. The degradation ability is limited , increase the cost of water treatment and other issues to achieve the effect of saving water resources and protecting the environment

Active Publication Date: 2010-10-13
哈尔滨瑞格能源环境技术发展有限责任公司 +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biochemical treatment method commonly used in industry has limited ability to degrade polycyclic aromatic hydrocarbons and heterocyclic aromatic hydrocarbons, and the COD value of the effluent is difficult to meet the standard
After biochemical treatment, advanced treatment with activated carbon adsorption is a more effective sewage treatment method, but activated carbon is expensive and needs to be regenerated or replaced after adsorption is saturated, which increases the cost of water treatment

Method used

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  • Coal chemical industry wastewater zero emission treatment method and system
  • Coal chemical industry wastewater zero emission treatment method and system
  • Coal chemical industry wastewater zero emission treatment method and system

Examples

Experimental program
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specific Embodiment 1

[0038] The water treatment equipment consists of a flocculation sedimentation tank, an active coke filter bed, a multi-stage membrane separation system and a pulping tank. The length, width and height of the flocculation sedimentation tank are 1.5m, 0.5m and 1m respectively. The length, width and thickness of the active coke filter bed are 1m, 0.5m and 0.5m respectively. The active coke is activated coke made of bituminous coal, with a particle size of 1-10mm, a bulk specific gravity of 0.81g / ml, and a specific surface area of ​​370m2 / g. The multi-stage membrane separation system consists of a first-stage ultrafiltration membrane, a second-stage nanofiltration membrane and a third-stage reverse osmosis membrane. The first-stage membrane can intercept substances with a molecular weight above 60,000, and is used for primary purification of water. The model is AQU90; the second-stage membrane For organic matter and ions with a molecular weight cut-off of 300 or more, model NE404...

specific Embodiment 2

[0042] Water treatment equipment is as described in specific embodiment one;

[0043] After biochemical treatment, the wastewater produced by the Lurgi gasification process enters the flocculation sedimentation tank, and polymer flocculants are added to the flocculation sedimentation, and after flocculation sedimentation, it enters the activated coke adsorption filter bed, and the filtration rate of the wastewater is controlled to 0.2m3 / h to remove the suspension in the water matter, macromolecular organic matter and some ammonia nitrogen. Then, it is sent into the multi-stage membrane separation system by the water pump. The purified water recovery rate of the primary ultrafiltration membrane is 90%, and all the separated concentrated water returns to the flocculation and sedimentation system, and the purified water enters the secondary nanofiltration membrane; the purified water recovery rate of the secondary membrane is 90%, and 80% of the separated concentrated water is retu...

specific Embodiment 3

[0046] Water treatment equipment is as described in specific embodiment one;

[0047] After biochemical treatment, the coking wastewater enters the flocculation sedimentation tank. Polymer flocculants are added to the flocculation sedimentation. After flocculation sedimentation, it enters the activated coke adsorption filter bed. The filtration rate of wastewater is controlled to 0.2m3 / h to remove suspended solids, macromolecular organic matter and Part of ammonia nitrogen. Then, it is sent into the multi-stage membrane separation system by the water pump. The purified water recovery rate of the primary ultrafiltration membrane is 90%, and all the separated concentrated water returns to the flocculation and sedimentation system, and the purified water enters the secondary nanofiltration membrane; the purified water recovery rate of the secondary membrane is 90%, and 80% of the separated concentrated water is returned to the flocculation system In the sedimentation system, the...

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Abstract

The invention discloses a coal chemical industry wastewater zero emission treatment method and a system. The system has an active coke absorption system, a multi-stage film separation system, a concentrated water recycling system and a water circulation system. Coal chemical industry wastewater after pretreatment and biochemical treatment are successively subjected to flocculation precipitation, absorption and filtering by active coke and multi-stage film separation; fresh water obtained after the multi-stage film separation reaches the circulating water use requirement of plants; and concentrated water obtained after the multi-stage film separation is added with CaCO3 or CaO to prepare into desulfurized slurry to serve as a desulfurizer in a coal-fired boiler flue gas desulfurization system or be directly used as humidifying water for flue gas desulfurization via a recirculating fluidized bed semidry method. The invention can realize wastewater recycling and zero emission, thus protecting environment and saving water resources.

Description

Technical field [0001] The invention relates to a coal chemical industry and industrial wastewater treatment technology, and in particular to a zero-discharge treatment method and system for coal chemical industry wastewater. Background technique [0002] Coal chemical wastewater is wastewater produced during the gasification, carbonization, purification and synthesis of chemical products of coal. Coal chemical industry wastewater has high pollutant concentration and complex composition. In addition to inorganic pollutants such as ammonia, cyanide, and thiocyanate, it also contains heterocyclic and polycyclic aromatic compounds such as phenols, naphthalene, pyridine, quinoline, and anthracene ( PAHs) is one of the most difficult industrial wastewaters to treat. It is difficult and costly to treat. [0003] In the existing technology, wastewater treatment methods can be divided into physical methods, chemical methods and biochemical methods according to changes in treatment ...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/44C02F1/52C02F1/28
Inventor 吴权洪赵建涛王淳郭欣吴勃孟宪磊
Owner 哈尔滨瑞格能源环境技术发展有限责任公司
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