Decarburization solution concentration

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We produce hydrogen from natural gas; the medium-pressure gas goes through liquid separation before proceeding to carbon removal. Since the plant started operating, one problem has persisted: the concentration of the carbon removal liquid is getting lower and lower. Our current approach is to discharge the excess solution from the carbon dioxide separation tank (with an amine concentration of less than 10 g/L) into the wastewater system, in addition to ensuring that the liquid level in the carbon dioxide regeneration tower is met. We replenish the decarboxylation solution once every little over a month to maintain the appropriate amine concentration. Previously, we would use the excess solution from the carbon dioxide separation tank and add it to the fresh solution tank, followed by steam flashing – but this method was not effective. Do any of you have any better solutions?