Question

Which mixture of gases is collectively produced as biogas during anaerobic sludge digestion?

Options

• Carbon monoxide (\[\mathrm{CO}\]), nitrogen (\[\mathrm{N_2}\]), and chlorine (\[\mathrm{Cl_2}\])

• Methane (\[\mathrm{CH_4}\]), sulphur dioxide (\[\mathrm{SO_2}\]), and oxygen (\[\mathrm{O_2}\])

• Ammonia (\[\mathrm{NH_3}\]), hydrogen sulphide (\[\mathrm{H_2S}\]), and oxygen (\[\mathrm{O_2}\])

• Methene (\[\mathrm{CH_4}\]), hydrogen sulphide (\[\mathrm{H_2S}\]), and carbon dioxide (\[\mathrm{CO_2}\])

Answer 1

In anaerobic sludge digesters, anaerobic bacteria digest bacterial and fungal biomass, releasing an inflammable gas mixture comprising Methene (\[\mathrm{CH_4}\]), hydrogen sulphide (\[\mathrm{H_2S}\]), and carbon dioxide (\[\mathrm{CO_2}\]), which constitutes biogas.