Improved method for treating nitrous acid in wastewater

Abstract

The invention discloses an improved method for treating nitrous acid in wastewater. The content of nitrate in industrial wastewater is relatively high, and the industrial wastewater has a toxic effect to a human body and aquatic creatures when not being treated. The improved method specifically comprises the following steps: (A) carrying out ultrafiltration on the industrial wastewater so as to remove macromolecular suspended solids, and collecting the macromolecular suspended solids by virtue of a filter residue recycling tank; (B) carrying out nanofiltration on ultrafiltration membrane penetration liquid in which the macromolecular suspended solids are removed, so as to obtain a concentration solution, and treating the concentration solution by virtue of an oxidation method, and introducing the concentration solution into a nitrite recycling tank; (C) detecting whether the ultrafiltration membrane penetration liquid in the step (B) is qualified, if so, recycling water; and (D) otherwise, enabling the water to flow back, carrying out nanofiltration, and repeatedly carrying out the step (B) and the step (C). By combining a membrane separation technique and the oxidation method so as to treat nitrate in the industrial wastewater, the design is reasonable, the efficiency is relatively high, the cost is relatively low, and the secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an improved method for treating nitrous acid in waste water. 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 s...

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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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