Advanced treatment and reuse method of high-temperature nitrochlorobenzene wastewater

A technology of nitrochlorobenzene and high-temperature wastewater, which is applied in natural water treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., to reduce the addition of fungicides and reducing agents, good removal effect, adaptable effect

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main purpose of this technical method is to further remove the remaining incompletely oxidized small molecule organic matter and a large number of inorganic ions in the product water after the enhanced oxidation of nitrochlorobenzene wastewater, fundamentally solve the discharge standard of nitrochlorobenzene wastewater, and reduce emissions increase water resource utilization and heat recovery

Method used

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  • Advanced treatment and reuse method of high-temperature nitrochlorobenzene wastewater
  • Advanced treatment and reuse method of high-temperature nitrochlorobenzene wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The treatment process of the produced water after the enhanced oxidation-gravity sedimentation of nitrochlorobenzene wastewater is as follows: figure 1 As shown, the main characteristics of the water quality of the produced water include: temperature 55°C, pH 7.0, COD 80mg / L, chroma 150 times, total iron content 30mg / L, conductivity 15000μs / cm, Cl - The content is 100mg / L. The process water after 55°C enhanced oxidation-sedimentation is sent to the ultrafiltration membrane system of cross-flow filtration through the ultrafiltration feed water pump. The ultrafiltration uses 0.01 μm PVDF hollow fiber ultrafiltration membrane, and the effective membrane area is 45m 2 , the membrane filtration flux is 180L / m when the water supply pressure is 0.3bar 2 h, the recovery rate of the ultrafiltration system is adjusted to 50%, and the ultrafiltration concentrated water is circulated to the gravity sedimentation tank of the enhanced oxidation process; the water quality of the ultr...

Embodiment 2

[0040] The treatment process of the produced water after the enhanced oxidation-gravity sedimentation of nitrochlorobenzene wastewater is as follows: figure 1 As shown, the main characteristics of the water quality of the produced water include: temperature 60°C, pH 7.5, COD 90mg / L, chroma 160 times, total iron content 35mg / L, conductivity 25000μs / cm, Cl - The content is 120mg / L. The process water after 60°C enhanced oxidation-sedimentation is sent to the ultrafiltration membrane system of cross-flow filtration through the ultrafiltration feed water pump. The ultrafiltration under high temperature conditions uses 0.1 μm PTFE hollow fiber ultrafiltration membrane with an effective membrane area of ​​50m 2 , the membrane filtration flux is 126L / m when the water supply pressure is 0.25bar 2 h, the recovery rate of the ultrafiltration system is adjusted to 55%, and the concentrated ultrafiltration water is circulated to the gravity sedimentation tank of the enhanced oxidation pro...

Embodiment 3

[0044] The treatment process of the produced water after the enhanced oxidation-gravity sedimentation of nitrochlorobenzene wastewater is as follows: figure 1 As shown, the main characteristics of the water quality of the produced water include: temperature 65°C, pH 8.0, COD 100mg / L, chroma 180 times, total iron content 55mg / L, conductivity 30000μs / cm, Cl - The content is 200mg / L. The process water after 65°C enhanced oxidation-sedimentation is sent to the ultrafiltration membrane system through the ultrafiltration feed water pump. The ultrafiltration under high temperature conditions uses 0.05μm PES hollow fiber curtain ultrafiltration membrane modules, and the effective membrane area is 48m 2 , the membrane filtration flux is 91L / m under the condition of negative pressure of -0.5bar 2 h, the ultrafiltration concentrated water is sent to the gravity sedimentation tank of the enhanced oxidation process through the circulating pump; the water quality of the ultrafiltration mem...

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Abstract

The invention relates to an advanced treatment and reuse method of high-temperature nitrochlorobenzene wastewater, and concretely relates to a method for treating high-temperature nitrochlorobenzene wastewater by utilizing a membrane separation technology. The method comprises the following steps: 1, directly filtering water obtained after the oxidation-gravity settlement of nitrochlorobenzene wastewater by an ultrafilter membrane filtration system; 2, carrying out primary pressurization of water obtained after the ultrafilter membrane filtration in step 1, and directly conveying the pressurized water to a primary reverse osmosis membrane system for filtration; and 3, carrying out secondary pressurization of water filtered in step 2, and directly conveying the filtered water obtained in step 2 to a secondary reverse osmosis membrane system for filtration, wherein water obtained after the secondary reverse osmosis is process reuse water. The finally obtained treated nitrochlorobenzene wastewater can satisfy quality requirements of make-up water for middle and low pressure boilers.

Description

technical field [0001] The invention relates to a method for advanced treatment and reuse of nitrochlorobenzene high-temperature wastewater, in particular to a method for treating nitrochlorobenzene high-temperature wastewater by using membrane separation technology. Background technique [0002] Nitrochlorobenzene is an intermediate for the preparation of medicines, azo dyes and sulfur dyes, and is also a raw material for the manufacture of pesticides and rubber. The production of nitrochlorobenzene is based on chlorobenzene as raw material, and the mixed acid of nitric acid and sulfuric acid is used as the nitrating agent for nitration. The crude product obtained by nitration needs to be washed with alkali and water, and then separated and purified by a rectification tower to obtain p-nitrochlorobenzene. Benzene and o-nitrochlorobenzene. Using the above production process, the production of each ton of nitrochlorobenzene products will produce 1.2~1.8t of waste water, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D61/58C02F103/36
Inventor 李正琪杨永强彭海珠张新妙
Owner CHINA PETROLEUM & CHEM CORP
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