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Method of treatment on vitamin production wastewater

A technology for the production of wastewater and vitamins, applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as excessive sludge, non-degradable organic matter, and increased treatment costs

Inactive Publication Date: 2018-12-07
杭州深瑞环境有限公司
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  • Claims
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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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  • Method of treatment on vitamin production wastewater

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Embodiment Construction

[0021] The following are specific examples of the present invention to further describe the technical solutions of the present invention, but the present invention is not limited to these examples.

[0022] A factory produces multivitamins. After purification and concentration, waste water is produced. The total phosphorus of this waste water exceeds 20000mg / L, COD50000mg / L, and sodium chloride 18%.

[0023] The waste water is pre-oxidized to oxidize and degrade the refractory organic matter into small molecular organic matter, and some of them are directly oxidized into CO 2 , water, which is convenient for salt extraction; the catalytic wet oxidation reaction temperature is set at 160°C, the reaction pressure is 6.0Mpa, and the air supply rate (Nm 3 / h) / Wastewater volume (m 3 / h) 100 times.

[0024] Crystallization is carried out by freezing and crystallization technology, and qualified industrial phosphate is obtained after filtration and cleaning. The total phosphorus f...

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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...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01B25/30C02F101/38C02F101/36C02F101/12
CPCC01B25/30C01B25/308C02F1/048C02F1/22C02F1/44C02F1/442C02F1/725C02F1/74C02F3/00C02F9/00C02F2101/12C02F2101/36C02F2101/38C02F2301/08
Inventor 沈静华伍立波
Owner 杭州深瑞环境有限公司
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