In one embodiment, a method includes gasifying a fuel source using a first oxygen stream supplied from an air separation unit (ASU), discharging a gasifier blowdown from a gasification and scrubbing system configured to gasify the fuel source, generating a grey water from the gasifier blowdown, and biologically treating the grey water in a reactor using a second oxygen stream supplied by the ASU.

An integrated gasification and power generation system includes a gasifier configured to receive biomass and generate syngas, wherein the gasifier is configured to operate at a pressure of approximately 100 bar to approximately 400 bar. The system further includes a recuperated Brayton thermodynamic power generation loop configured to receive the generated syngas and convert the generated syngas into a CO.sub.2 working fluid, wherein at least a portion of the CO.sub.2 working fluid from the power generation loop is reintroduced from the power generation loop to the gasifier.

Disclosed herein is a reaction process system comprising: a reactor system configured to support an endothermic process of a feedstock: wherein the reactor system comprises: a reaction chamber with an internal region arranged to support the endothermic reaction of the feedstock; a heating system that is at least partially within the internal region of the reaction chamber; the heating system comprises a plurality of heating reactors; each heating reactor comprises walls that separate an internal region of the heating reactor from the rest of the internal region of the reaction chamber; each heating reactor comprises an oxygen carrier material in the internal region of the heating reactor; each heating reactor is arranged to support a reduction reaction between the oxygen carrier material and a fuel in the internal region of the heating reactor; and each heating reactor is arranged to support an oxidation reaction between the oxygen carrier material and oxygen in the internal region of the heating reactor; one or more heat exchangers arranged to generate the steam by heating water with heat recovered in dependence on one or more fluid flows out of the reactor system; and when applicable, a steam supply conduit arranged to supply at least some of the generated steam to the reactor system.

A powder supply hopper pressurizing apparatus including a first buffer tank in which pressurizing gas to be supplied to a powder supply hopper is accumulated at a predetermined pressure, a second buffer tank, a lower part pressure adjustment nitrogen system connected to the powder supply hopper, to supply the gas toward powder fuel stored in the powder supply hopper when supplying the powder fuel to a burner, and a control unit that controls the first buffer tank to pressurize the powder supply hopper to a first pressure and then controls the second buffer tank to pressurize the powder supply hopper to a second pressure, and where the control unit determines that one of the first buffer tank or the second buffer tank is non-usable, the control unit pressurizes the powder supply hopper by use of the first or second buffer tank that is operable, and the gas supply system.