Method for treating nitrite in industrial wastewater

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...

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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 reaction needs to be carried out at a higher temperature, and the efficiency is low; the chemical oxidation method has the advantages of simple equipment and low treatment cost, but the industrial wastewater contains different substances, and a single chemical oxidation method may produce other harmful substances. form secondary pollution

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