How to deal with ethanol-containing wastewater with high COD? ? ?
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1.3% ethanol content, 170ppm diphenyl sulfone (DPS), COD 2990, BOD 870. If you want to reduce COD to less than 1000, what is the best method? ? ? ? Can I use some chemicals? I don’t want to install any big equipment for biodegradation, because the water volume is not large, 80 tons/day, and the requirements are not high. The award is only 1,000. What if the COD is required to be reduced to less than 500? ? ? ?
No one is watching, why are there no answers?
There must be something wrong with your data. According to theoretical calculations (please refer to the book "Operation Management and Abnormal Countermeasures for Wastewater Biological Treatment" edited by Xu Yatong), the COD value of 1g of ethanol is 2.08g. After calculation, the COD of 1.3% ethanol wastewater is 27000mg/L. I don't know how you obtained the COD of your wastewater? It is recommended to use physical and chemical methods such as distillation and extraction to treat the wastewater. Adding chemicals may not be possible. Ethanol is difficult to remove with chemicals (coagulant) unless it is oxidized. You can also consider oxidation to remove COD from the water, for reference only.
Add an aeration device and extend the aeration time.
The poster's data may be analytical data. I don’t know if the COD detection method is the chromium method.
I suggest using the oxidation method, because the extraction industry is different, and the cost of distillation is too high, and a distillation tower needs to be built. It is recommended to strengthen the oxidant for oxidation.
The effects of oxidation, adsorption, biochemistry, etc. are not good. Is there any friend who would like to give some suggestions on which oxidant is better?
The construction unit of the project I recently worked on directly built a sewage treatment station.
Haha, you can consider special distillation, which can not only recover ethanol but also treat wastewater. There are already successful projects. If you are interested, you can chat privately!
We have developed an improved pervaporation process that overcomes some of the limitations of pervaporation, making the operation safer, more reliable, and more economical. Particularly suitable for treating small batches of wastewater. If interested, please get in touch. Mail: yjqin1@yahoo.com