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I am studying tge lca of a water treatment plant. everything goes well but why the sludge ( Output) are not included  in the results?

is there an answer  why the sludge which is a high quantity  is not included?
in openLCA by (120 points)

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It depends a bit on how your model looks like (screenshots are always helpful). For example, if sludge is of type waste and linked to a waste treatment process that has this as an input, it will not occur in the inventory because it is consumed in the system. Instead, you would find it in the 'total requirements' section then.