NOVELTY - Biogas collection system (10) comprises wastewater source (14); an interceptor tank (18) hydraulically connected to the source; a wastewater treatment facility (24) configured to process the quantity of effluent; effluent line (22) hydraulically interconnecting the interceptor tank and the treatment facility; a biogas processing facility (36) configured to receive and process the quantity of biogas; biogas pipeline interconnecting interceptor tank and biogas processing facility; and an air release valve.    USE - As a biogas collection system for collecting biogas from a wastewater system (claimed) to produce electricity and/or reduce greenhouse gas emissions; used in treating municipal wastewater and handling greenhouse gases that are associated with wastewater; and also used for capturing and transporting biogas in septic tank effluent pump (STEP)/septic tank effluent gravity (STEG) systems.    ADVANTAGE - The system efficiently and effectively captures the biogas and transports it to a facility for producing energy or combusting it to a less environmentally harmful substance. The biogas collection system provides a closed biogas system that improves the amount of biogas which can be beneficially utilized or beneficially processed by a wastewater treatment system and reduces the greenhouse gases emitted by the wastewater treatment system. The system can be easily incorporated into a STEP/STEG system for relatively low additional costs, thereby not significantly impacting the cost of installing a wastewater treatment system. The biogas collection system allows virtually no biogas to vent to the atmosphere from either the conveyance or treatment components, resulting in a wastewater handling system that is more environmentally friendly than prior art systems and able to generate revenue from electricity generation that can be utilized to offset construction and operating costs.    DETAILED DESCRIPTION - Biogas collection system (10), comprises at least one wastewater source (14), each of the wastewater sources generating wastewater; an interceptor tank (18) hydraulically connected to the wastewater source, the interceptor tank configured to receive wastewater from the wastewater sources and generate a quantity of effluent and a quantity of biogas; a wastewater treatment facility (24) configured to process the quantity of effluent; at least one effluent line (22) hydraulically interconnecting the interceptor tank and the wastewater treatment facility, each of the effluent line configured to transport the quantity of effluent to the wastewater treatment facility; a biogas processing facility (36) configured to receive and process the quantity of biogas so as to beneficially utilize the quantity of biogas and/or reduce the greenhouse gas (GHG) effect of it, the biogas processing facility located at the wastewater treatment facility; at least one biogas pipeline interconnecting the interceptor tank and the biogas processing facility, each of the biogas pipeline configured to transport the quantity of biogas to the biogas processing facility; and an air release valve operatively attached to at least one of the effluent line at a high elevation point, the air release valve hydraulically connected to at least one of the biogas pipeline to transport a second quantity of biogas from at least one of the effluent line to the biogas processing facility for processing thereby. An INDEPENDENT CLAIM is included for collecting biogas from a wastewater system involving delivering wastewater from at least one wastewater source to an interceptor tank configured for anaerobic processing of the wastewater; digesting the wastewater inside the interceptor tank to produce a quantity of effluent and a quantity of biogas; and transporting the quantity of effluent from the interceptor tank to a wastewater treatment facility for processing thereby and transporting the quantity of biogas from the interceptor tank to a biogas processing facility for use and/or processing thereby.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a municipal septic tank biogas collection system configured to show the biogas being collected from the interceptor tanks and effluent pipelines.    Biogas collection system (10)    Wastewater sources (14)    Interceptor tank (18)    Effluent lines (22)    Wastewater treatment facility (24)    Biogas processing facility (36)