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A kind of efficient treatment method of graphene production wastewater

A technology for the production of wastewater and treatment methods, which is applied in natural water treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of high treatment costs and investment costs, high nitrates, high sulfates, etc., and achieve good effluent quality , less investment in equipment, complete removal effect

Active Publication Date: 2019-12-17
济宁璟华环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also reverse osmosis, electrodialysis, and ion exchange methods, but there are problems with concentrated water treatment
[0003] Therefore, the main difficulties in the treatment of graphene wastewater are: first, the nitrate is very high, and the treatment cost and investment cost are high; second, the sulfate is very high, the treatment cost and investment cost are high; third, because of the high salt content, Strong acidity, so it cannot be treated with biochemical methods

Method used

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  • A kind of efficient treatment method of graphene production wastewater
  • A kind of efficient treatment method of graphene production wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of graphene production wastewater efficient treatment method of the present invention comprises the following steps:

[0017] 1) Removal of nitrate and total nitrogen: the waste water enters the regulating tank and is stirred by an air compressor to homogenize the water quantity and quality. Zinc powder filler and zeolite are placed in the nitrate tower, the zinc powder filler is 200 mesh, the filling rate is 5%; the zeolite is 15 mesh, the filling rate is 1%, and the aluminum catalyst is mixed, and the amount of the aluminum catalyst is 1‰ of the zinc powder filler amount , adjust the pH to 1.5, and when the pH value is 1.5, a redox reaction occurs with nitrate and nitrite in the water. The reaction time is 1h. The acid is reduced to nitrogen and can be directly discharged into the air, and the effluent after the reaction enters the zinc salt recovery pool;

[0018] 2) Recovery and treatment of zinc: add sodium carbonate 1060mg / L to the zinc salt recovery tank ...

Embodiment 2

[0025] A kind of graphene production wastewater efficient treatment method of the present invention comprises the following steps:

[0026] 1) Removal of nitrate and total nitrogen: the waste water enters the regulating tank and is stirred by an air compressor to homogenize the water quantity and quality. Zinc powder filler and zeolite are placed in the nitrate tower, the zinc powder filler is 300 mesh, the filling rate is 10%; the zeolite is 20 mesh, the filling rate is 5%, and an aluminum catalyst is mixed, and the amount of the aluminum catalyst is 1.2‰ of the zinc powder filler amount ,, adjust the pH to 1.0, when the pH value is 1, redox reaction occurs with nitrate and nitrite in the water, the reaction time is 1h, the nitrate in the water is reduced to nitrite by zinc powder, and the nitrite undergoes amino The reduction of sulfonic acid to nitrogen can be directly discharged into the air, and the effluent after the reaction enters the recovery pool of zinc salt;

[00...

Embodiment 3

[0034] A kind of graphene production wastewater efficient treatment method of the present invention comprises the following steps:

[0035] 1) Removal of nitrate and total nitrogen: the waste water enters the regulating tank and is stirred by an air compressor to homogenize the water quantity and quality. Zinc powder filler and zeolite are placed in the nitrate tower, the zinc powder filler is 250 mesh, the filling rate is 7%; the zeolite is 18 mesh, the filling rate is 3%, and the aluminum catalyst is mixed, and the amount of the aluminum catalyst is 1.2‰ of the zinc powder filler amount , adjust the pH to 1.0, and when the pH value is 1.0, redox reaction occurs with nitrate and nitrite in the water. The reaction time is 1h. The acid is reduced to nitrogen and can be directly discharged into the air, and the effluent after the reaction enters the zinc salt recovery pool;

[0036] 2) Recovery and treatment of zinc: add sodium carbonate 1200mg / L to the zinc salt recovery tank ...

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Abstract

The invention discloses an efficient treatment method for wastewater of a graphene production process and belongs to the technical field of treatment of wastewater of industrial production. The efficient treatment method comprises the following steps: removing nitrate and total nitrogen, recycling zinc, recycling manganese and removing sulfate, wherein the treated wastewater of the graphene production process reaches standards and can be discharged into a municipal sewage treatment plant. The efficient treatment method has the characteristics that the pH (Potential of Hydrogen) value of the wastewater of the graphene production process does not need to be adjusted, and the nitrate and nitrite in water can be directly reduced into nitrogen gas through a synergistic effect of zinc and aluminum, and the nitrogen gas can be directly discharging into the air; zinc carbonate is generated through a sodium carbonate reaction and can be recycled through a solid waste treatment unit; the manganese and silver sulfate are separated and recycled through controlling a pH value range, and mutual interference of all ions is not caused; the method has the advantages that the removal is relatively complete, the process flow is simple, and the water quality of output water is good; needed equipment investment is less, and a small area is occupied; solid wastes can be completely recycled, so that energy saving and environment friendliness are facilitated; and the efficient treatment method has relatively high economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of industrial production wastewater treatment, and in particular relates to a method for efficiently treating graphene production wastewater. Background technique [0002] During the production process of graphene, waste water such as pickling is produced. The waste water contains acid, salt, COD, suspended solids and phosphorus. It is 2500-4100mg / L, nitrate is 1000-1900mg / L, manganese salt is 405-520mg / L, pH value is 1-2, it is strong acid high salt water, so it cannot be treated by biochemical method. At present, the conventional process is acid-base neutralization and re-precipitation treatment. This process cannot remove nitrate, so the total nitrogen index is very high, which cannot meet the standards for taking over municipal sewage plants. Nitrate removal methods include ferrous salt and aluminum powder to reduce nitrate in water to ammonia, but ammonia cannot be discharged directly into the atmosph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/16C02F103/34
CPCC02F1/5236C02F1/56C02F1/62C02F1/64C02F1/66C02F1/70C02F9/00C02F2101/101C02F2101/16C02F2103/34C02F2301/08
Inventor 焦伟堂焦晗焦满赢李丽张成凤焦伟祥
Owner 济宁璟华环保科技有限公司