This document provides an overview of biogas production from organic waste. It discusses the key benefits of biogas production, including odor reduction, improved energy security, and production of fertilizer. Various biogas plant designs are described, and factors to consider in selection and sizing of plants are outlined. The utilization of biogas and slurry products is also summarized. The document then goes on to provide details on engineering design concepts for different biogas digester styles and considerations in examining biogas systems.