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US 2022/0177344 A1Published application
Digestion of organic sludge
AssigneeHaskoningDHV Nederland B.V.
InventorsAntonius Theodorus Wilhelminus Maria HENDRIKS, Eddie KOORNNEEF
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Abstract
The invention is in the field of organic sludge digestion from various sources, such as manure, sludge from a wastewater treatment plant, and an organic fraction of dredging sludge. The present method provides advanced control for serially treating aqueous organic sludge by anaerobic digestion. It further relates to dewatering of the obtained biomass.
Claims22
A method for serially treating aqueous organic sludge by anaerobic digestion, comprising
- feeding input sludge through a fluidic connection to a first digestion reactor in a series of N digestion reactors and feeding a controlled part of the input sludge through a fluidic connection to a second digestion reactor, wherein N≥2,
- feeding an effluent of an nth digestion reactor through a fluidic connection to an n+1th digestion reactor, wherein n∈[1,N],
- feeding a controlled part of the effluent of a Nth digestion reactor through a fluidic connection to at least one lower ranked digestion reactor,
- feeding a controlled part of an effluent of the second digestion reactor through a fluidic connection to the first digestion reactor,
- removing a controlled part of 30-100% of the effluent of the Nth digestion reactor,
- obtaining concentration of fatty acids, and at least two values of pH, an amount of dry sludge in a feed, a temperature of at least one digestion reactor, and a type of the input sludge
- regulating a fluid level in at least one digestion reactor in the series of N digestion reactors by one of the group of limiting and preventing overflow of an nth reactor to a subsequent n+1th reactor, and a parameter selected from at least one flow, an amount of sludge in a digestion reactor, an amount of anti-foam in a digestion reactor, and combinations thereof, wherein a flow is selected from flows, and
- digesting the input sludge, during a period of time of more than 3 days, wherein a total solid retention time for digestion is a period of time of 3-21 days, in at least one of the series of N digestion reactors, at a temperature from 20-70° C.
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A reactor set-up for serially treating aqueous organic sludge by anaerobic digestion, comprising
- a series of N digestion reactors, wherein N≥2, between an nth digestion reactor and an n+1th digestion reactor a fluidic connection,
- a sludge input for a first digestion reactor,
- an effluent output for a Nth digestion reactor,
- an dewatering device in fluid connection with the post-digester,
- a fluidic effluent connection between a second digestion reactor and the first digestion reactor,
- a fluidic effluent connection between the Nth digestion reactor and at least one lower ranked digestion reactor,
- at least one controller for
- obtaining at least two values of pH, an amount of dry sludge in a feed, a temperature of at least one digestion reactor, and a type of the input sludge, wherein the at least two values are obtained from at least one of the sludge in the input and the first digestion reactor, and
- regulating a fluid level in a digestion reactor by one of a group of limiting or preventing overflow of an nth digestion reactor to a subsequent n+1th digestion reactor, and a parameter selected from at least one flow, an amount of sludge in a digestion reactor, an amount of anti-foam in a digestion reactor, and a combination thereof, wherein the at least one flow is selected from flows, and for controlling dewatering by obtaining values of pH and redox values, wherein the values of pH and the redox values are obtained from at least one of the sludge in the input and the first digestion reactor, and by regulating a flow between at least one Nth digestion reactor and the post-digester and the dewatering device,
- at least one heater for digesting the sludge in at least one digestion reactor at a temperature from 20-70° C. during a period of time of more than 3 days,
- and
- at least one pump for providing flow.
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Dependencies are inferred from the claim text.