Syngas biomethanation process and anaerobic digestion system
First Claim
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1. A process comprising steps of,a) producing a synthesis gas from pyrolysis of a feedstock;
- b) producing a mixture of gasses in the headspace of an anaerobic digester;
c) withdrawing a portion of the mixture of gasses from the headspace of the anaerobic digester;
d) withdrawing a stream of digestate from the anaerobic digester;
e) mixing the withdrawn portion of the mixture of gasses and the synthesis gas into the stream of digestate to produce a stream of digestate comprising the withdrawn portion of the mixture of gasses and the synthesis gas; and
f) returning the stream of digestate comprising the withdrawn portion of the mixture of gasses and the synthesis gas to the anaerobic digester.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.
37 Citations
8 Claims
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1. A process comprising steps of,
a) producing a synthesis gas from pyrolysis of a feedstock; -
b) producing a mixture of gasses in the headspace of an anaerobic digester; c) withdrawing a portion of the mixture of gasses from the headspace of the anaerobic digester; d) withdrawing a stream of digestate from the anaerobic digester; e) mixing the withdrawn portion of the mixture of gasses and the synthesis gas into the stream of digestate to produce a stream of digestate comprising the withdrawn portion of the mixture of gasses and the synthesis gas; and f) returning the stream of digestate comprising the withdrawn portion of the mixture of gasses and the synthesis gas to the anaerobic digester. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification