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Is there an existing free database for chemical and waste management data relevant to water treatment? Or is it best to invest in ecoinvent? I find that the free version of ecoinvent does not provide a lot of chemical data.
in openLCA by (120 points)

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I am not sure about "the free version of ecoinvent" but you can of course always check the databases in Nexus. I would however also recommend that you check the modeling assumptions and available background datasets for the model that you have in mind, such as transport, electricity, asf.; you will most likely not find one process in any database that fully represents the product you want to model but rather will look for a database that provides "the rest" that you also need to make a complete life cycle model.