Dear sir,
I am currently building a anaerobic digester as school project and I want to generate Electricity from it without contributing to green house effect.
Please, I need your professional advice.

I am currently building a anaerobic digester as school project and I want to generate Electricity from it without contributing to green house effect.
Please, I need your professional advice.

Professional advice on what? Your project, your goal, or how to do it?

You should hire an experienced consultant in that field as well as go through websites of biogas equipment manufacturers.