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US 6,984,323 B2Granted
Biological treatment process
OwnerBoris M. Khudenkoinventor
Life of this patent
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OwnerBoris M. Khudenkoinventor
Estimating the term…
This is a method of waste treatment in tall reactors having with anaerobic biological stage in the lower section of the reactor and another treatment stage in the upper section of the reactor, these stages are separated by an essentially horizontal partition. Presurized digestion gases generated in the anaerobic section are collected under the partition. The process is further improved by providing a recuperable alkalinity and stripping of biologically generated carbon dioxide. so that the free carbon dioxide concentratioon in the anaerobic mixed liquor is very low and a methane-rich digestion gas is produced. Production of pressurized methane-rich digestion gas is the major benefit of the process. Ather improvements are in the controllable gaslift mixing with gases other than digestion gases, improved process performance with increasing operating temperatures due to bioheating, and improved solid-liquid separation due to the use of the distillation techniques making use of the bioheating and heat recycle.
A method of biological treatment of wastewater with biomass, said wastewater and said biomass form mixed liquor, in a tall reactor, said reactor having a top, a bottom, and an essentially horizontal partition between said top and said bottom, comprising (a) at least one anaerobic treatment step conducted between said bottom and said partition, a digestion gas comprising methane and carbon dioxide is formed in said anaerobic treatment, (b) a step of mixing said mixed liquor in said anaerobic step by at least one controllable gaslift with a gas other than said digestion gas, and (c) at least one step of treatment of said wastewater conducted between said partition and said top of said reactor.
A method of biological treatment of wastewater with biomass, said wastewater and said biomass form mixed liquor, in a tall reactor, said reactor having a top, a bottom, and an essentially horizontal partition between said top and said bottom, comprising (a) at least one anaerobic treatment step conducted between said bottom and said partition, a digestion gas comprising methane and carbon dioxide is formed in said anaerobic treatment, (c) at least one step of treatment of said wastewater conducted between said partition and said top of said reactor, and (c) collecting said digestion gas under said partition, whereby said collected gas is pressurized.
A method of biological treatment of wastewater with biomass, said wastewater and said biomass form mixed liquor, in a tall reactor, said reactor having a top, a bottom, and an essentially horizontal partition between said top and said bottom, comprising (a) at least one anaerobic treatment step conducted between said bottom and said partition, a digestion gas comprising methane and carbon dioxide is formed in said anaerobic treatment, (c) at least one step of treatment conducted between said partition and said top of said reactor, and (d) at least one step of vaporization-separation of liquid from solids in said mixed liquor.
Dependencies are inferred from the claim text.