Method for treating waste water from production of metronidazole

A technology for producing wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of reducing pollutant concentration, eliminating biological toxicity and improving biodegradability
CN102153240AActive Publication Date: 2011-08-17黄冈银河阿迪药业有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
黄冈银河阿迪药业有限公司
Publication Date
2011-08-17

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Abstract

The invention relates to a method for treating waste water from production of metronidazole. The steps of the method are as follows: adding alkali in metronidazole process waste water to adjust pH value and after evaporation, sending the metronidazole process waste water to a waste water adjusting tank; allowing imidazole process waste water and nitration process waste water to enter the waste water adjusting tank respectively through a grating; after mixture as well as water-quality and water-quantity adjustment by the waste water adjusting tank, sending the imidazole process waste water and the nitration process waste water to an electrolyzer for electrochemical catalysis water treatment; adding lime milk in the effluent of the electrolyzer to adjust pH value, sequentially removing ammonia-nitrogen by a neutralization aeration tank, adding flocculant, separating by a coagulative precipitation tank, and allowing supernatant water to enter a facultative tank for anaerobic degradation; and conducting oxic degradation by a biomembrane aeration tank and precipitation by a secondary precipitation tank on the effluent of the facultative tank for standardized discharge. Adopting a electrochemical catalysis water treatment technology for pretreating waste water, the method effectively eliminates the biotoxicity of the waste water, lowers the pollutant concentration of the waste water and greatly improves the biodegradability of the waste water, thus laying foundation for standardized biochemical treatment. The method is simple in technology and convenient in operation.
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Description

technical field

[0001] The invention relates to a method for treating production wastewater, in particular to a method for treating metronidazole production wastewater. Background technique

[0002] Metronidazole, as one of the main drugs to kill anaerobic bacteria, has been widely used clinically. However, metronidazole production wastewater contains toxic substances that inhibit the growth of microorganisms or even kill microorganisms, and also contain salts such as sodium formate and sodium sulfate. The composition is complex, the concentration of organic matter and salt is high, the biological toxicity is high, and its biodegradability is extremely poor. . The existing wastewater treatment methods of metronidazole production mainly include catalytic oxidation method, internal electrolysis method and water dilution microbial treatment.

[0003] The catalytic oxidation method is that under the action of a catalyst, the organic matter in the wastewater is oxidized and dec...

Claims

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