How to treat glycerol wastewater
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Recently, I’ve encountered an increasing number of cases involving glycerin wastewater, with a COD level of around 10,000 to 20,000. The salt content is generally around 10%. The glycerin concentration isn’t high, not exceeding 3%, so glycerin isn’t recovered. However, it’s also necessary to avoid the formation of any other precipitates or salts. Does anyone have any good solutions? Ozone treatment hasn’t worked well; Fenton’s process generates sludge, which is not acceptable. Direct treatment via biological processes is not feasible due to the high salt content. Do you have any other good ideas?
The salt must be separated first before proceeding with biochemical tests~~~~ Or, if the amount of water is low, it should be diluted
It must first be desalted (using methods such as distillation) and then regenerated
There is glycerol present; it’s not appropriate to evaporate it first, as the efficiency would be too low. The main goal is to recover the calcium chloride contained within, and no other catalysts that could affect purity should be added
How much water is there? If the volume is not too large, vacuum evaporation drying technology can be considered.
In multi-effect evaporation with a sufficiently low water volume, around 200 units per day can be processed. The wastewater consists of simple components: salt and glycerin. Without a catalyst, the effect is not significant; however, the use of a catalyst affects the recovery of salt. Evaporation is carried out first, but the presence of glycerin leads to excessive waste and low efficiency
200 tons or 200 liters per day? The goal now is to recover salt and glycerin, right?
Why can’t it evaporate if there is glycerin present?