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Treatment method for resource utilization of strong brine in coking enterprises

A treatment method and technology of concentrated brine, applied in water/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems of direct discharge not meeting discharge standards, corrosion and scaling of equipment pipes and nozzles, concentration of concentrated brine pollutants High-level problems, to achieve stable treatment effect, improve recycling rate, and reduce membrane fouling

Pending Publication Date: 2021-11-05
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The wastewater after advanced treatment inevitably produces a large proportion of concentrated brine while obtaining most of the primary pure water. The concentrated brine has high pollutant concentration and high salt content, and direct discharge cannot meet the discharge standard. Conventional biochemical The treatment is more difficult. In the past, the treatment of concentrated brine was to use it to flush slag, but the concentrated brine is easy to cause corrosion and scaling on equipment pipes and nozzles. higher cost

Method used

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  • Treatment method for resource utilization of strong brine in coking enterprises

Examples

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Effect test

Embodiment 1

[0024] A treatment method for resource utilization of concentrated brine in coking enterprises. The treatment object is the concentrated brine produced by membrane method in coking enterprises. Its conductivity is 9.0ms / cm, COD is 80mg / L, and total hardness is 1300mg / L.

[0025] 1. The concentrated brine of the coking enterprise first enters the chemical softening tank, adds 800mg / L calcium hydroxide and 400mg / L sodium carbonate, and stirs for 20 minutes to remove the scaling ions in the concentrated brine.

[0026] 2. The effluent enters the sand filter tank for filtration. The lower layer is filled with steel slag with a particle size of 1.2mm, and the upper layer is filled with quartz sand with a particle size of 0.5mm. The filter material uses both quartz sand and steel slag to retain solid particles and colloids of different particle sizes in the water.

[0027] 3. After filtration, the effluent enters the pH adjustment tank, adjusts the pH value to 7.0, and then enters th...

Embodiment 2

[0031] A treatment method for resource utilization of concentrated brine in coking enterprises. The treatment object is the concentrated brine produced by membrane method in coking enterprises. Its conductivity is 11.0ms / cm, COD is 100mg / L, and total hardness is 1400mg / L.

[0032] 1. The concentrated brine of the coking enterprise first enters the chemical softening pool, add 900mg / L calcium hydroxide and 450mg / L sodium carbonate, and stir for 25 minutes to remove the scaling ions in the concentrated brine.

[0033] 2. The effluent enters the sand filter tank for filtration. The lower layer is filled with steel slag with a particle size of 1.3mm, and the upper layer is filled with quartz sand with a particle size of 0.8mm. The filter material uses both quartz sand and steel slag to retain solid particles and colloids of different particle sizes in the water.

[0034] 3. After filtration, the effluent enters the pH adjustment tank, adjusts the pH value to 7.5, and then enters th...

Embodiment 3

[0038] A treatment method for resource utilization of concentrated brine in coking enterprises. The treatment object is the concentrated brine produced by membrane treatment in coking enterprises. Its conductivity is 12.0ms / cm, COD is 120mg / L, and total hardness is 1500mg / L.

[0039] 1. The concentrated brine of the coking enterprise first enters the chemical softening pool, add 1000mg / L calcium hydroxide and 500mg / L sodium carbonate, and stir for 30 minutes to remove the scaling ions in the concentrated brine.

[0040] 2. The effluent enters the sand filter tank for filtration. The lower layer is filled with steel slag with a particle size of 1.5mm, and the upper layer is filled with quartz sand with a particle size of 1.0mm. The filter material uses both quartz sand and steel slag to retain solid particles and colloids of different particle sizes in the water.

[0041] 3. After filtration, the effluent enters the pH adjustment tank, adjusts the pH value to 8.0, and then enter...

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Abstract

The invention relates to the technical field of industrial wastewater treatment, and in particular, relates to a treatment method for resource utilization of strong brine in coking enterprises. The method specifically comprises the following steps: 1) enabling strong brine to enter a chemical softening pool to remove scaling ions; 2) feeding effluent into a sand filter tank, and intercepting solid particles and colloids; 3) feeding into an adjusting tank and an activated carbon adsorption tower; 4) performing ion exchange, regenerating after operation, enabling the wastewater to flow back to the adjusting tank, and enabling produced water to enter an ultrafiltration system; and 5) carrying out nanofiltration on the ultrafiltration produced water, returning backwashing water to the adjusting tank, and feeding the nanofiltration produced water into an electrodialysis system. The process is low in energy consumption, low in cost, simple in equipment, easy to operate, stable in treatment effect, low in system operation pressure, high in total recovery rate and obvious in desalting effect, generated acid and alkali can be recycled, the yield of strong brine is reduced, and the recycling rate is increased.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment method for resource utilization of concentrated brine in coking enterprises. Background technique [0002] Coking wastewater is toxic, harmful, and difficult to degrade high-concentration organic wastewater. The organic matter is mostly phenolic compounds, accounting for about half of the total organic matter. The organic matter also includes polycyclic aromatic compounds and heterocyclic compounds containing nitrogen, oxygen, and carbon. , Inorganic pollutants are mainly ammonia nitrogen, cyanide, sulfide, and rhodanide. [0003] At present, most domestic coking plant wastewater treatment systems adopt primary and secondary treatment processes, but in recent years they have also begun to adopt tertiary treatment processes. Primary treatment refers to the recycling of pollutants in high-concentration wastewater, including ammonia water depheno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/16
CPCC02F9/00C02F5/06C02F5/02C02F1/004C02F1/66C02F1/283C02F2001/425C02F1/442C02F1/444C02F1/4695C02F2303/22C02F2303/16C02F2103/16C02F2301/046
Inventor 刘芳胡绍伟马光宇陈鹏徐伟王永王飞张冲
Owner ANGANG STEEL CO LTD
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