Zero-discharge treatment method and system for coking ammonia distillation wastewater

A technology of ammonia distillation wastewater and treatment method, which is applied in the directions of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. The problem of low removal efficiency

Inactive Publication Date: 2020-10-23
山东锐海环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (1) Coking wastewater contains phenols and cyanides that have toxic and inhibitory effects on microorganisms, resulting in low removal efficiency of the biochemical system;
[0012] (2) Coking wastewater contains organic matter that is difficul...

Method used

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  • Zero-discharge treatment method and system for coking ammonia distillation wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Ammonia distillation wastewater from a coking plant: COD is 4000mg / L, volatile phenol is 400mg / L, cyanide is 15mg / L, sulfide is 75mg / L, ammonia nitrogen is 1100mg / L.

[0065] Adopt processing method provided by the invention to process:

[0066] The wastewater to be treated is firstly added with 50mg / L ozone and then enters the ozone pre-oxidation tank, and the pre-oxidation time is 30 minutes;

[0067] Add 50mg / L polyaluminium and 3mg / L cationic polyacrylamide to the ozone pre-oxidized effluent and enter the air flotation. The hydraulic retention time of the air flotation is 20 minutes, and the air-water volume ratio is 500:1;

[0068] The air floats out of the water into the electrocatalytic oxidation unit for 10 minutes of oxidation, and the current density between the plates is 5.0mA / cm 2 , the distance between the plates is 10cm;

[0069] The electrocatalytic oxidation effluent enters the anoxic / aerobic biological pool, and the sludge concentration is maintained ...

Embodiment 2

[0077] Ammonia distillation wastewater from a coking plant: COD is 6000mg / L, volatile phenol is 840mg / L, cyanide is 30mg / L, sulfide is 120mg / L, ammonia nitrogen is 1500mg / L.

[0078] Adopt processing method provided by the invention to process:

[0079] The waste water to be treated is firstly added with 80mg / L ozone and then enters the ozone pre-oxidation tank, and the pre-oxidation time is 45 minutes;

[0080] Add 70mg / L polyaluminium and 5mg / L cationic polyacrylamide to the ozone pre-oxidized effluent and enter the air flotation. The hydraulic retention time of the air flotation is 30 minutes, and the air-water volume ratio is 500:1;

[0081] The air floats out of the water into the electrocatalytic oxidation unit for 40 minutes of oxidation, and the current density between the plates is 15mA / cm 2 , the distance between the plates is 6cm;

[0082]The electrocatalytic oxidation effluent enters the anoxic / aerobic biological pool, and the sludge concentration is maintained a...

Embodiment 3

[0090] Ammonia distillation wastewater from a coking company: COD is 8000mg / L, volatile phenol is 1100mg / L, cyanide is 40mg / L, sulfide is 150mg / L, ammonia nitrogen is 2000mg / L.

[0091] Adopt the treatment method provided by the present invention to process: the waste water to be treated first enters the ozone pre-oxidation tank after adding 100mg / L ozone, and the pre-oxidation time is 60 minutes;

[0092] Add 100mg / L polyaluminium and 6mg / L cationic polyacrylamide to the ozone pre-oxidized effluent and enter the air flotation. The hydraulic retention time of the air flotation is 40 minutes, and the air-water volume ratio is 500:1;

[0093] The air floats out of the water and enters the electrocatalytic oxidation unit for 60 minutes of oxidation. The current density between the plates is 20mA / cm 2 , the distance between the plates is 3cm;

[0094] The electrocatalytic oxidation effluent enters the anoxic / aerobic biological pool, and the sludge concentration is kept at about 6...

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a zero-discharge treatment method and system for coking ammonia distillation wastewater. According tothe zero-discharge treatment method for coking ammonia distillation wastewater, the coking ammonia distillation wastewater is sequentially subjected to ozone pre-oxidation, air floatation, electrocatalytic oxidation, an A/O biochemical process, precipitation, flocculation, ozone catalytic oxidation, a biological aerated filter process, ultrafiltration membrane filtration, nanofiltration membrane filtration and reverse osmosis membrane treatment; the electrocatalytic oxidation hydraulic retention time is 10-60 min; an anode plate is a lead-rhenium coating electrode, a cathode is a graphite carbon electrode, the distance between polar plates is 3-10 cm, and the current density is 5-20 mA/cm<2>. According to the treatment method, the treatment cost is low, deep treatment is achieved, the treated coking ammonia distillation wastewater is recycled, and zero emission is truly achieved. The invention further provides the coking ammonia distillation wastewater zero-discharge treatment system which is convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a zero-discharge treatment method and system for coking ammonia distillation wastewater. Background technique [0002] Coking wastewater is industrial wastewater containing volatile phenols, polycyclic aromatic hydrocarbons, oxygen, sulfur, nitrogen and other heterocyclic compounds produced during the high-temperature dry distillation, purification and recovery of by-products of coking and gas. It is a kind of industrial wastewater with high CODcr, high phenol value, high Ammonia nitrogen and difficult to treat a kind of industrial organic wastewater. There are three main sources: one is residual ammonia water, which is the waste water produced in coal dry distillation and gas cooling, and its water volume accounts for more than half of the total coking waste water, which is the main source of coking waste water; the other is in the process of gas purific...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/10C02F101/16C02F101/18C02F101/30C02F101/34
CPCC02F1/04C02F1/24C02F1/441C02F1/442C02F1/444C02F1/4672C02F1/5236C02F1/56C02F1/725C02F1/78C02F3/30C02F9/00C02F2001/007C02F2101/101C02F2101/16C02F2101/18C02F2101/30C02F2101/345
Inventor 邹宗海郝欣欣臧彦强赵峰冯建辉张金富王东恩
Owner 山东锐海环境科技有限公司
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