Mixer settler extraction of coking wastewater treatment technology
Coking wastewater mainly include steamed ammonia wastewater, coking waste water, methanol wastewater, etc. , belong to the high concentration organic industrial wastewater, including several groups in addition to the classification of 85% compound, include aliphatic compounds, heterocyclic compounds and polycyclic aromatic compounds, etc. , the phenolics are more likely to be biodegradable, and heterocyclic compounds and polycyclic compounds and so on is more difficult;
Polyformaldehyde waste water mainly containing formaldehyde, sulfides, formaldehyde as fungicide, on biological poison effect, mainly through dosing reaction and control the amount of water to remove formaldehyde or reduce the content of formaldehyde;
The main pollutants in the adipic acid wastewater for nitrate and COD, denitrifying bacteria can help by removing nitrate, through aerobic � � � should remove COD, but this kind of wastewater by denitrifying approach to remove nitrate needs a lot of carbon source.
tributyl phosphate kerosene extraction of high phenolic coking wastewater with tributyl phosphate extraction of high phenolic coking wastewater, the investment is too big.
If meet the demand of a coking plant, need to buy a lot of tributyl phosphate kerosene, although after the extraction of tributyl phosphate kerosene can be washed with lye recycling, but because the sodium phenolate recovery also need to invest in lye, and tributyl phosphate is not can use unlimited time, their use has certain times, certain extraction effect, will need to replace tributyl phosphate, investment is very big, and finished with tributyl phosphate kerosene belongs to flammable pollutants, should not be piled up for a long time.
solution, began to reduce coking wastewater in coking plant of reflux, lower concentration of the pollutants in the coking wastewater, simple pretreatment, application of microorganism to deal with it.
On the other hand, can one-time increase investment, and adopts steam dephenolizing tower for removal of the lye recycling (
Compared with the extraction solvent cleaning more clean and simple)
If extraction solvent cleaning fluid sodium phenolate easy to recycle and the economy, can continue to in coking wastewater using tributyl phosphate removal of phenol by extraction, using the reoccupy after fatigue to power plants burning method processing.
chemical wastewater composition is more complex, organic pollutants not only has a phenolic compound, fat compounds, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, sulfur and aldol polymers and inorganic pollutants in cyanide and ammonia nitrogen, sulfur, cyanide, sulphide, hinge salt is given priority to, this kind of wastewater of high concentration of refractory and toxic organic industrial wastewater.
coking production operation control is extensive, water quality fluctuation is large, its composition mainly include steamed ammonia wastewater, methanol production wastewater, such as the complex pollutant composition, high concentration and toxicity, and biochemical effect is bad, the main pollutants are COD and ammonia nitrogen.
Adipic acid and other chemical production operation control more delicate, sewage water quality stability control, its N03 -
High concentrations of N, if not in addition to a carbon source satisfy the denitrifying bacteria oxidation N03 -
N, total nitrogen standard is difficult, but by adding methanol nutrients to supplement the carbon source, operation cost is too high.
liquid-liquid extraction and solvent extraction, which is also called extraction (
General in the oil refining industry)
, it is a kind of used liquid extraction agent processing and not mutually soluble two-component or multi-component solution, implementation component separation and mass transfer separation process, is a kind of widely used unit operation.
Liquid-liquid extraction of mass transfer driving force is for separation of solute in two basically mutual miscibility between liquid phase distribution difference.
Classified according to whether the reaction in the process of extraction, liquid-liquid extraction can be divided into two types: physical extraction and chemical extraction.
in many liquid-liquid extraction process, in particular, many for the extraction process of metal ions, accompanied by a chemical reaction occurs, the chemical reaction between the solute and extraction agent.
This kind of extraction separation process is called chemical extraction method.
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