Method of treatment on vitamin production wastewater

Abstract

The invention discloses a method of treatment on vitamin production wastewater, which comprises: (1) performing catalytic wet-type oxidization on the vitamin production wastewater; (2) freeze-crystallizing the oxidized liquid of the vitamin production wastewater, and performing solid-liquid separation to obtain disodium hydrogen phosphate dodecahydrate; (3) performing membrane concentration on theseparated liquid after the freeze crystallization; (4) performing chemical dephosphorization to the permeated liquid after the membrane concentration; (5) evaporating the permeated liquid after the chemical dephosphorization to remove NaCl salt; (6) performing catalytic wet-type oxidization on the evaporated waste liquid; (7) biochemically treating an evaporative condensate of the oxidized wasteliquid. The method is used for treating the wastewater mainly with the catalytic wet-type oxidization technology with combination of crystallization, membrane concentration and the like, so that the method can recycle the salts from the wastewater and achieves the object of zero-emission.

Description

technical field [0001] The invention relates to the technical field of environmental protection engineering, in particular to a method for treating waste water from vitamin production. Background technique [0002] Due to the wide variety of vitamin medicines, a variety of raw materials need to be used in the production process of the medicines, and the production process is relatively complicated, so the composition of the wastewater is also very complicated, the concentration of organic matter in the raw water is high, and the COD is as high as tens of thousands mg / L, which seriously exceeds the national discharge standard. . For example, vitamin B11, also known as folic acid, has a deep color and complex composition in its wastewater, mainly containing hydrochloric acid, pyridine, p-aminobenzoyl glutamic acid, sodium chloride, and trichloroacetone, which are difficult to degrade biochemically. Comprehensive whole plant wastewater, its wastewater contains a large amount o...

AI Technical Summary

Problems solved by technology

Physical and chemical methods are purely expensive in terms of treatment and cannot degrade organic matter. They are just a kind of concentration or transfer of pollution, which may cause secondary pollution.

The traditional biochemical degradation method has a high degradation rate of BOD in water, but when dealing with biochemically refractory organic matter, the removal rate is low, and the biochemical method is not tolerant to high-salt wastewater, and often needs to be diluted with low-concentration water or tap water Several times or tens of times, resulting in expansion of processing scale and high total processing costs

[0004] The current chemical oxidation methods mostly use iron-carbon micro-electrolysis and ozone oxidation. These two methods can degrade a part of organic matter, but the removal efficiency of COD up to tens of thousands mg / L is not high, and iron-carbon micro-electrolysis The electrolysis method consumes more hydrogen peroxide and acid-base, and also forms more sludge and solid waste, resulting in increased treatment costs

The ozone oxidation method has a strong oxidation ability, and has the effects of decolorization, deodorization, sterilization, removal of organic and inorganic substances, etc., and has no secondary pollution. The disadvantage is that the power consumption required for the production of ozone is large, and the power consumption per kilogram of ozone is about 20 to 35 degrees. , high processing cost

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