Why is a biogas plant a safe and efficient method of waste disposal? Justify.

(N/A) biogas plant is considered a safe and efficient method of waste disposal for the following reasons:
$1$. It effectively manages organic waste,such as animal dung and agricultural residues,by converting them into useful energy.
$2$. The process produces biogas,which is a clean fuel that burns without smoke and leaves no harmful residue,thereby reducing air pollution.
$3$. The remaining slurry,after the production of biogas,is rich in nitrogen and phosphorus,making it an excellent organic manure for crops.
$4$. It helps in maintaining sanitation by disposing of waste in a controlled environment,which prevents the breeding of pathogens.