Usually you need to ...

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Usually you need to calculate the whole cost of project (CAPEX & OPEX) plus you need to think about gas emmison regulation.  Most of companies in Europe forced to burn sludge because their farm land already saturated with P&N and there is no demand on fertiliser sludge. And some companies want show that they are green companies.

As well you need to dewater the sludge to allow it to burn and this process is costly. If you add all OPEX , H&S risks and hassles including government consents and approval. Convert sludge to electricity is a very expensive option.

Regards

Majed Murad