I have similar question here. The example provided by openLCA is waste as a part of production process, where it represents by waste flow. How about modeling municipal waste with zero burden approach?
For example, one will model plastic recycling process, and the rejected part from sorting process (output) goes into incinerator. Does the initial plastic waste is represented as product flow or waste flow since the rejected part from sorting process will be represented as waste flow (I guess) and goes into incinerator. Does it make sense to model this recycling process as if it is product (initial plastic waste input is product flow) and the rejected part is waste flow? or model it as waste where the plastic waste input is waste flow and the rejected part is waste flow as well?