|Home > NETT21 > Technologies for Resource/Energy Recovery from Sewage Sludge|
|Name of Technology||Anaerobic Co-digestion System with Low Running Cost of Power Generation|
|Technology Owner||JFE Engineering Corporation
Daiki Ataka Engineering Co., Ltd.
Dainen Co., Ltd.
|General Description||This technology uses existing digestion tanks to digest kitchen refuse
and other organic waste (hereinafter "kitchen refuse"), viewing
a wastewater treatment plant as a facility for using local biomass. The
aim of this technology is to produce biogas from previously untapped energy
sources which can then be used to generate power.
In comparison with conventional incineration at refuse incineration plants, this technology processes refuse at a lower cost. Consequently, the costs of conventional treatment and disposal can be allocated to sewerage projects to improve the project balance sheet.
This technology also allows biogas power to be generated at low cost, benefiting from economies of scale, since the increased biogas output in comparison with sewage sludge-only systems leads to larger-capacity power generation equipment. Moreover, incorporating bio-desulfurization, this technology refines the produced digestion gas more cheaply than the conventional technology and improves the reliability of digestion gas power generation by also removing siloxane.
Combining these features, this technology greatly reduces the cost of effectively using sewage sludge.
Conceptual diagram of newly developed technology
|Components of Technology||The major components of this technology are: (1) Receiving/pretreatment equipment, (2) Digestion tank, (3) Digestion gas refining equipment, (4) Digestion gas power generation equipment and (5) Dewatering equipment. These components have the following features. |
Receives kitchen refuse and carries out pretreatment for feeding into the digestion tank.
Transforms received organic matter to digestion gas. This technology uses existing equipment.
(3)Digestion gas refining equipment
Refines digestion gas by removing siloxane and hydrogen sulfide contents to make digestion gas suitable for use by power generation equipment.
(4)Digestion gas power generation equipment
Comprises a gas engine or micro gas turbine to use digestion gas for power generation.
Dewaters sludge produced in the digestion tank. This technology uses existing dewatering equipment.
Schematic image of the technology
|Features of Technology||
This technology processes received kitchen refuse in a suitable pretreatment process and produces an increased amount of digestion gas using the existing digestion tank. Furthermore, it incorporates bio-desulfurization to refine the produced digestion gas at a lower cost than by the conventional technology and combines siloxane removal to improve the reliability of digestion gas power generation.
(4) Siloxane-removing equipment
|Evaluation of Technology||
This technology was developed in the LOTUS Project (Lead to Outstanding technology for Utilization of Sludge Project) and evaluated and reviewed by the Sewerage Technology Development Project Committee under the Ministry of Land, Infrastructure and Transport in Japan in 2007.
Environmental Industrial Engineering Division, JFE Engineering Corporation