TECHNICAL FIELD
[0001] The present disclosure relates to a waste treatment system and a waste
treatment method.
The present application claims priority based on Japanese Patent Application
5 No. 2020-162457 filed on September 28, 2020, the entire content of which is
incorporated herein by reference.
BACKGROUND ART
[0002] It is desired to effectively use unused biomass, for example, urban waste
from households, food factories, or the like, agricultural waste such as rice straw,
10 wheat straw, and palm residue, livestock excreta, and sewage sludge. For example,
in a technique described in Patent Document 1, waste is hydrothermally treated
(hydrolyzed) with steam by a reformer, and solid fuel is produced from a solid phase
of a reactant obtained by the hydrolysis. Further, combustion energy generated by
combustion of the solid fuel is used to generate steam, and the generated steam is
15 used to perform the hydrolysis.
Citation List
Patent Literature
[0003] Patent Document 1: JP2013-511386A (translation of a PCT application)
SUMMARY
20 Problems to be Solved
[0004] However, in the technique described in Patent Document 1, since
combustion energy generated by combustion of the solid fuel is used to generate
steam, there is a risk that the demand for steam from the reformer cannot be met
promptly, and the reformer may be put on standby.
25 [0005] The present disclosure was made in view of the above problem, and an
3
object thereof is to provide a waste treatment system and a waste treatment method
whereby it is possible to promptly meet the steam demand from the reformer.
Solution to the Problems
[0006] In order to achieve the above object, a waste treatment system according
5 to the present disclosure includes: at least one reformer for hydrolyzing waste with
steam; a microbial reactor for microbially degrading a reformed material containing
at least a solid of the waste hydrolyzed by the at least one reformer; and at least one
steam generation device for generating the steam by using only combustion energy
of a gas produced in the microbial reactor.

We Claim:
1. A waste treatment system, comprising:
at least one reformer for hydrolyzing waste with steam;
a microbial reactor for microbially degrading a reformed material
5 containing at least a solid of the waste hydrolyzed by the at least one reformer;
and
at least one steam generation device for generating the steam by using
only combustion energy of a gas produced in the microbial reactor.
2. The waste treatment system according to claim 1, further comprising a heat
10 retention steam pipe connecting the reformer and the microbial reactor,
wherein exhaust steam after hydrolyzing the waste is supplied from the
reformer to the microbial reactor through the heat retention steam pipe, and
wherein the microbial reactor is kept within a predetermined temperature
range by heat of the exhaust steam supplied from the reformer.
15 3. The waste treatment system according to claim 1 or 2, further comprising:
a drying device for drying a residue obtained after the microbial reactor
microbially degrades the reformed material; and
a drying steam pipe connecting the reformer and the drying device,
wherein exhaust steam after hydrolyzing the waste is supplied from the
20 reformer to the drying device through the drying steam pipe, and
wherein the drying device is configured to dry the residue by heat of the
exhaust steam supplied from the reformer.
4. The waste treatment system according to any one of claims 1 to 3, further
comprising a separation device disposed between the at least one reformer and
25 the microbial reactor,
wherein the separation device is configured to separate an unsuitable
29
substance that is unsuitable for producing the gas in the microbial reactor from
the waste hydrolyzed by the at least one reformer.
5. The waste treatment system according to any one of claims 1 to 4,
wherein the at least one steam generation device includes a first steam
5 generation device and a second steam generation device, and
wherein the waste treatment system is configured such that the steam is
generated in at least one of the first steam generation device or the second
steam generation device according to steam demand from the reformer.
6. The waste treatment system according to any one of claims 1 to 5,
10 wherein the at least one reformer includes a plurality of reformers, and
wherein at least two of the plurality of reformers are configured to
perform hydrolysis at different timings.