Gasification waste water treatment using air separation unit oxygen

摘要

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.

主权项

1. A gasification system, comprising:
a gasification and scrubbing system configured to produce syngas and black water from at least a fuel source, water, and oxygen; a black water treatment system coupled to the gasification and scrubbing system, wherein the black water treatment system is configured to treat the black water to produce a grey water; and a grey water treatment system coupled to the black water treatment system and configured to receive the grey water, wherein the grey water treatment system comprises:
a bioreactor comprising microbes configured to utilize oxygen to oxidize chemical species within the grey water to generate a treated grey water, wherein the oxygen utilized by the gasification and scrubbing system and the bioreactor is generated by an air separation unit (ASU) fluidly coupled to the gasification and scrubbing system and the bioreactor; and a controller configured to adjust an amount of the oxygen provided to the bioreactor based on a chemical oxygen demand (COD) of the grey water, a biological oxygen demand (BOD) of activated sludge within the bioreactor, or a combination thereof.