Aspects of the invention relate to improvements in the flexibility with which oxygen and hydrogen, for example from electrolysis, may be supplied to processes having both gasification and methanation steps, as well as improvements in how such processes may be operated in response to variations in carbonaceous feeds. Offsets, between the ideal quantity of hydrogen and the quantity available from a given source may be compensated for by adjusting one or more operations of the process, and in particular such operation(s) that ultimately impact the quantity of CO and/or CO.sub.2 available downstream of the gasifier for conversion to methane in an RNG product stream.

Aspects of the invention relate to improvements in the flexibility with which oxygen and hydrogen, for example from electrolysis, may be supplied to processes having both gasification and methanation steps, as well as improvements in how such processes may be operated in response to variations in carbonaceous feeds. Offsets, between the ideal quantity of hydrogen and the quantity available from a given source may be compensated for by adjusting one or more operations of the process, and in particular such operation(s) that ultimately impact the quantity of CO and/or CO.sub.2 available downstream of the gasifier for conversion to methane in an RNG product stream.

A hydrothermal treatment device (3) is a hydrothermal treatment device (3) performing hydrothermal treatment by heating high-water-content biomass, the hydrothermal treatment device (3) including a treatment container (21) that stores sludge, a sludge supply unit (22) that supplies the sludge to inside of the treatment container (21) such that a space (S) is formed in a vertical upper part of the treatment container (21), a stirrer (23) that is provided within the treatment container (21) and stirs stored matter such that counter flows in an up/down direction occur, and a heat transfer tube (24) that is disposed in a horizontal direction within the treatment container (21) and heats the sludge with heat of vapor flowing within the heat transfer tube (24).

A method of processing biogas that includes obtaining a mobile tank containing biogas at a pressure greater than 1000 psig, connecting the mobile tank to a pressure let down system, and depressurizing the mobile tank to remove biogas therein. The depressurization includes removing gas from the mobile tank using the pressure let down system, and introducing a warming gas into the mobile tank.

A method of processing biogas that includes obtaining a mobile tank containing biogas at a pressure greater than 1000 psig, connecting the mobile tank to a pressure let down system, and depressurizing the mobile tank to remove biogas therein. The depressurization includes removing gas from the mobile tank using the pressure let down system, and introducing a warming gas into the mobile tank.

A method for providing a fuel includes removing hydrogen sulfide and/or carbon dioxide from biogas to provide partially purified biogas, which is filled in a mobile storage system. The partially purified biogas is transported to a centralized processing facility, in the mobile storage system, by truck, rail, or ship. At the centralized processing the partially purified biogas is further processed, either to produce a fuel that is renewable or has renewable content, or to produce renewable natural gas, which is used to produce the fuel that is renewable or has renewable content.

Aspects of the invention relate to improvements in the flexibility with which oxygen and hydrogen, for example from electrolysis, may be supplied to processes having both gasification and methanation steps, as well as improvements in how such processes may be operated in response to variations in carbonaceous feeds. Offsets, between the ideal quantity of hydrogen and the quantity available from a given source may be compensated for by adjusting one or more operations of the process, and in particular such operation(s) that ultimately impact the quantity of CO and/or CO.sub.2 available downstream of the gasifier for conversion to methane in an RNG product stream.

Aspects of the invention relate to improvements in the flexibility with which oxygen and hydrogen, for example from electrolysis, may be supplied to processes having both gasification and methanation steps, as well as improvements in how such processes may be operated in response to variations in carbonaceous feeds. Offsets, between the ideal quantity of hydrogen and the quantity available from a given source may be compensated for by adjusting one or more operations of the process, and in particular such operation(s) that ultimately impact the quantity of CO and/or CO.sub.2 available downstream of the gasifier for conversion to methane in an RNG product stream.

A system and method for duplicating a flammable gas (SDFG) that utilizes a specially engineered liquid in combination with a purpose-built container to duplicate the flammable gas is disclosed. There are three methods for the production of an engineered liquid for use in the system. In less than one hour, a single unit of any flammable or hydrocarbon gas will yield up to at least double the quantity of the same gas back.

A system and method for duplicating a flammable gas (SDFG) that utilizes a specially engineered liquid in combination with a purpose-built container to duplicate the flammable gas is disclosed. There are three methods for the production of an engineered liquid for use in the system. In less than one hour, a single unit of any flammable or hydrocarbon gas will yield up to at least double the quantity of the same gas back.