A kind of treatment method of pyridine-containing wastewater

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a treatment method for pyridine-containing wastewater. The treatment method of pyridine wastewater includes steps: (1) rectification: the pyridine wastewater is pumped into a rectification tower for rectification; (2) nanofiltration: the bottom liquid of the rectification tower enters a nanofiltration device for treatment; (3) reverse Osmosis: The separation liquid after the nanofiltration device enters the reverse osmosis device for treatment; (4) Biochemical treatment: the RO separation liquid after the reverse osmosis treatment adjusts the pH and then enters the biochemical system for treatment. A treatment method for pyridine-containing wastewater of the present invention reduces the amount of incineration to 30-45% of the original, reduces energy waste, and reduces wastewater treatment costs; for pyridine wastewater stock solution with a COD of 20000-30000 mg / L, reverse osmosis treatment After separating liquid COD<2000 mg / L, COD removal rate is greater than 91%, pyridine content is zero, BOD test BOD 5 The / COD value is between 0.3-0.7, which proves that biochemical treatment can be carried out. After the biochemical treatment is completed, the wastewater meets the discharge standard; the process flow is simple, the operation is simple, and it is easy to realize automation.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for pyridine-containing wastewater. Background technique [0002] Pyridine is a widely used chemical product. In addition to being used as a solvent, pyridine can also be used in industry as a denaturant, a dyeing aid, and a series of products (including pharmaceuticals, disinfectants, dyes, food seasonings, adhesives, etc.) agents, explosives, etc.). Most of the pyridine industrial production methods use formaldehyde + acetaldehyde + ammonia to synthesize pyridine. However, because the pyridine process wastewater contains pyridine, aldehyde, ammonia, benzene, tar and other substances, the pyridine wastewater has a foul smell and is difficult to be oxidized by air, especially the pyridine in the wastewater has a strong inhibition or toxicity to the biological bacteria in the biochemical process. , and even lead to the paralysis of the entire acti...

AI Technical Summary

Problems solved by technology

However, because the pyridine process wastewater contains pyridine, aldehyde, ammonia, benzene, tar and other substances, the pyridine wastewater has a foul smell and is difficult to be oxidized by air, especially the pyridine in the wastewater has a strong inhibition or toxicity to the biological bacteria in the biochemical process. , and even lead to the paralysis of the entire activated sludge system, making the biochemical treatment of wastewater very difficult

[0003] The commonly used treatment methods for pyridine wastewater are incineration, resin adsorption, rectification and oxidation treatment. These four methods all have many shortcomings: (1) Incineration: consumes a lot of energy, and the tail gas after incineration contains a lot of CO 2 and NO X , which increases the burden of tail gas treatment, and the cost is very high; (2) Resin adsorption method: When the wastewater contains high salt, ions will interfere with the exchange of pyridine by the resin. Secondary pollution; (3) Rectification method, the waste water is completely vaporized, which consumes a large amount of latent heat of phase change. If the content of pyridine in the waste water is high, it can be partially rectified to recover pyridine; (4) Oxidation treatment, through electrocatalysis or TiO 2 Photocatalytic degradation of pyridine into small molecular substances followed by biochemical treatment, most of which are in the laboratory research stage

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