(Abstract)
We depend on supplies from overseas for most of the raw materials of fertilizers, which are essential for agricultural production in Japan, and they are highly sensitive to international market conditions as well as trends in exports of the countries that produce the raw materials. As an urgent measure to construct a sustainable food system and to respond to soaring food prices, the government has announced a policy to promote domestic production and stable supply of fertilizer by expanding the utilization of unused resources such as sewage sludge and compost. This article introduces policies, technologies, and initiatives to expand the utilization of sewage sludge resources as fertilizer.
(Abstract)
Selective catalytic reduction is one of the denitrification technologies used in municipal waste incineration facilities. While selective catalytic reduction is a technology that can meet the stringent NOx emission regulations, there are problems such as system installation cost, securing spaces for installation and maintenance, replacement of the catalyst when its activity decreases, and the need for thermal energy to reheat the exhaust gas at the inlet of the system. An on-site catalyst regeneration facility was developed to address these issues. It is a system that regenerates the catalyst to a level equivalent to a new one in a short time without taking out the catalyst from the catalyst denitrification unit. Our company delivered the first unit of this system to a municipal waste incineration facility in May 2014 and has since delivered the equipment to three other facilities. This article explains the advantages of the on-site catalyst regeneration facility and introduces an example of delivery to the latest facility. We will also report on the status of catalyst regeneration, and the status of repeated regeneration at the first unit.
(Abstract)
In March 2025, we delivered a power generation system to Power Aid Mie LLC for Power Aid Mie Shin-BiomassTM Matsusaka Power Plant. This power plant operates without utilizing the Feed-in Tariff (FIT) scheme and uses a mixed fuel consisting of woody biomass, waste construction material chips and Refuse Paper and Plastic Fuel (RPF). For this delivery, the equipment was based on our standard 2MW-class biomass power generation system, with partial modifications to accommodate RPF co-firing. This paper presents an overview of the equipment as well as the operational results and discussions, including an examination of the secondary combustion air injection patterns.
(Abstract)
Minuma Environmental Center, which was completed in March 2025, has achieved stable operation with the latest high-performance stoker-type incinerator and advanced ACC. It continues business operations as a high-efficiency waste power generation facility that generates high levels of electricity through a highly efficient waste-to-energy system, and as a material recycling promotion facility that contributes to resource recycling. This article gives an overview of this facility, and its characteristics and operation results.
(Abstract)
At Kahoku County City Clean Center, which was completed in March 2023, they carry out rationalization (streamline processes) through waste incineration and consolidated sludge treatment. Specifically, they dry the sewage sludge generated from four different sewage treatment plants in a steam indirect-heating-type sewage sludge dryer by utilizing part of the steam generated in waste incineration. They put the dried sludge in mixed combustion with waste for utilization as a heat source for drying sludge and generating power. While the moisture content of the dried sludge fluctuates due to differences in the sludge properties and treatment volume in this dryer when the operating conditions are fixed, we have confirmed that the moisture content can be adjusted by changing various parameter settings of the dryer. This article reports on our confirmation that stable operation of the dryer is possible by introducing an automatic control method using image analysis to further save labor in adjusting these parameters.
