Method for treating nitrite in industrial wastewater

A technology for nitrite and industrial wastewater, applied in the field of membrane separation, can solve the problems of low efficiency, secondary pollution, large investment, etc., and achieve the effects of high efficiency, low cost and reasonable design

Inactive Publication Date: 2017-02-01
HEFEI XINDA MEMBRANE TECH
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Problems solved by technology

The ion exchange method is to concentrate nitrite in the medium or waste liquid, which is easy to cause secondary pollution; the biological method has the characteristics of high efficiency and low consumption, but the investment is large; although the chemical reduction method can reduce nitrite to harmless nitrogen , but the re...

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  • Method for treating nitrite in industrial wastewater

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Embodiment Construction

[0017] In order to make it easier for those skilled in the art to understand the solution of the present invention, the technical solution of the present invention will be further specifically described in conjunction with specific embodiments.

[0018] Such as figure 1 Shown, the present invention is a kind of treatment method of nitrite in industrial waste water, and treatment process is that waste water enters nanofiltration treatment after pretreatment (ultrafiltration treatment) removes the suspension of macromolecule, and concentrated solution is treated and recovered through oxidation process For nitrite, the permeate is recycled for use after repeated treatment several times and passed the inspection. The specific operation steps are as follows:

[0019] Step 1, the industrial wastewater is treated by ultrafiltration to remove suspended solids of macromolecules;

[0020] Step 2, the ultrafiltration membrane permeate from which macromolecules have been removed is proc...

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Abstract

The invention discloses a method for treating nitrite in industrial wastewater. The content of the nitrate in the industrial wastewater is higher, so that if being discharged to the environment without treatment, the industrial wastewater has a toxic action for a human body and aquatic life. The method comprises the following concrete operating steps: 1, carrying out ultrafiltration treatment on the industrial wastewater so as to remove macromolecular suspended matters; 2, treating ultrafiltration membrane permeate liquid without macromolecules in a way of nanofiltration, carrying out oxidation treatment on the obtained concentrated liquor and then enabling the product to enter a nitrite recycle bin; 3, enabling the ultrafiltration membrane permeate liquid of the step 2 to flow back for carrying out nanofiltration treatment, repeating the operation of the step 2 for two or three times, and then detecting whether the obtained water is qualified or not, and if so, recycling the water for use; 4, if not, enabling the obtained water to flow back to the ultrafiltration membrane permeate liquid, and repeating the operation of the step 3.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for treating nitrite in industrial wastewater. Background technique [0002] Nitrite, a general term for a class of inorganic compounds, widely exists in various water bodies and salted products in nature and industrial production, such as groundwater, surface water, aquaculture ponds, drinking water, seawater, industrial wastewater and sausages, pickles Wait. It is often used as a food additive in industrial production to improve food taste, color and extend its shelf life. Nitrite is a toxic substance that is harmful to the human body and aquatic organisms. The research on the treatment of nitrite in industrial wastewater has a long history. The traditional common methods include ion exchange, reverse osmosis, electrodialysis, Biological and denitrification, chemical and chemical catalytic nitrification, but these methods have their own shortc...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/44C01B21/50
CPCC02F1/444C01B21/50C02F1/442C02F1/722C02F1/74C02F2101/166
Inventor 王海波储振国杜金满
Owner HEFEI XINDA MEMBRANE TECH
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