What are the three methods of pre-treatment of influent for anaerobic digestion?

Question:What are the three methods of pre-treatment of influent for anaerobic digestion?

1.Galvanization, pyrolysis and pre-heating

2.Mechanical treatment, pre-heating and thermal treatment

3.Galvanization, pyrolysis and thermal treatment

4.Pyrolysis, thermal treatment and pre-heating


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