Syngas biomethanation process and anaerobic digestion system
First Claim
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1. A process for converting a feedstock to biogas comprising steps of,a) producing a synthesis gas from pyrolysis of the feedstock;
- b) separating organic compounds from the synthesis gas and returning the separated organic compounds to step a) as additional feedstock; and
,c) adding the synthesis gas to an anaerobic digester.
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Abstract
An anaerobic digester is fed a feedstock, for example sludge from a municipal wastewater treatment plant, and produces a digestate. The digestate is dewatered into a cake. The cake may be dried further, for example in a thermal drier. The cake is treated in a pyrolysis system to produce a synthesis gas and biochar. The gas is sent to the same or another digester to increase its methane production. The char may be used as a soil enhancer.
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Citations
14 Claims
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1. A process for converting a feedstock to biogas comprising steps of,
a) producing a synthesis gas from pyrolysis of the feedstock; -
b) separating organic compounds from the synthesis gas and returning the separated organic compounds to step a) as additional feedstock; and
,c) adding the synthesis gas to an anaerobic digester. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for transferring syngas to digestate comprising,
a) a pipe between a source of digestate and a digester; -
b) a pump to create a flow of digestate in the pipe; c) an ejector, microbubble pump or gas transfer membrane in communication with the pipe and having an inlet connected to a source of the syngas; and
,a heat exchanger between the inlet and the source of the syngas. - View Dependent Claims (8, 9, 10, 11)
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12. A process and apparatus for treating wastewater comprising,
a) treating the wastewater to generate a sludge; -
b) feeding the sludge to an anaerobic digester to produce biogas and digestate; c) dewatering the digestate to produce a cake; d) thermally drying the cake to produce a dried cake; e) pyrolysing the dried cake to produce char, organic compounds and syngas; f) feeding the syngas to the anaerobic digester; and
,g) pyrolysing at least some of the organic compounds to produce additional syngas and feeding the additional syngas to the anaerobic digester. - View Dependent Claims (13, 14)
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Specification