If it requires constant intervention (in the form of a daily dose of an additive) then it is unsustainable.Jobs for the boys.
It's not rocket science, if you place organic material in a warm, semi-liquid environment, bacteria grows and flourishes. One of the bi-products is gas (excuse me, I just had to pass wind and belch)
Dependent on the temp and ph in that environment depends on which family of bacteria prospers. Gaining a advantage on this 'topical' subject will no doubt attract a few industry awards, and maybe a bit of extra revenue, however being sustainable means exactly that. The key is long-term sustainability, in other words, if a solution is found, then it must be followed by the letter or it reverts to type.
That’s the thing about nature, it requires zero intervention from humans. Almost as if it would be better off without us……