How to dispose of the alkaline residue resulting from the desulfurization of liquefied gas?
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How to dispose of the alkaline residue resulting from the desulfurization of liquefied gas? Does anyone have any good suggestions? I have around 700-800 tons of alkali slag this year, and I’m not sure what treatment process to use for it.
Note: The acidic water stripping unit is used as an alkali injection device for the stripping unit.
We also produce around 700 tons per year; more than 300 tons of this is treated by adding alkali to the recycled wastewater, and the remaining 300 tons, along with the alkali residues from other equipment in the plant, are sent to a qualified company for disposal at a hazardous waste treatment center. I have seen alkali slag treatment systems; the previous one was also very expensive. The factory invited experts for technical discussions not long ago, but since there is no suitable place to dispose of the water produced by such systems, they have not been put into use yet.
We’re also very stuck right now – it’s a bit expensive to have it handled by an external party, but we don’t really have any good options for handling it ourselves!
It can also be sent for coking and scum treatment.
We use a pure hydrogenation process here – hydrogenation is carried out throughout the entire process, with no coking units!
I’ve seen their design for the equipment used in alkali slag treatment; it doesn’t seem very complex, so the price should not be too high. It consists of a tower along with a reboiler, and then there’s the issue of the specialized catalysts, which are expensive
The waste alkali here is sent to a recycling facility for treatment; the specific process is unknown!
For the treatment of alkaline slag, wet oxidation is likely to be used; however, only about 30–70% of the COD in the wastewater can be reduced, and the remaining portion still requires biochemical treatment in a wastewater treatment plant.
It will increase the sodium content in the stripped wastewater, affecting its reuse
There is a new technology for catalytic liquefied gas desulfurization and alcohol removal, which achieves zero alkaline slag emissions and enables treatment at the source.