Horokanai Town has known to produce the most buckwheat in Japan, approximately more than 2,900 tons of buckwheat annually. In recent years, the demand for shelled buckwheat has increased. As the result, the industrial waste which included the buckwheat husks and buckwheat residues, are generated in large quantities. Currently, the town does not have an effective treatment or recycling methods in managing the wastes from the buckwheat husks and buckwheat residue. Therefore, we aimed to investigate the production of biocoke from four biomass materials: buckwheat husks, buckwheat residue, garbage, and sewage sludge. Furthermore, we also analyzed a process to reduce kerosene consumption in Horokanai Town by using biocoke as a heating fuel in the boiler. It was found that 108 tons of biocoke can be produced annually. If those biocoke are used for heating the Horokanai town government building, approximately 51.5 kl/year of kerosene and 81 tons/year of CO₂ emissions can be reduced. In addition, the incineration ash generated from biocoke boiler does not contain heavy metals and also rich in minerals, therefore it can be returned to agricultural land.

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This current study aimed to provide information on the mechanism of clinker formation and to effectively utilize the combustion ash by using a commercially available pellet stove that was commonly used for residential application. （1） Mixed combustion experiment was conducted by using the biocoke made from wood pellets. The result showed that the suggested approach was effective in improving the character of clinker when using a mixed combustion ratio up to 10%. （2） Next, a concrete material （mortar） made from the biomass combustion ash was prototyped. As the result, there was no particular problem with the workability during the filling of the formwork.

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Achieving green casting is the goal of the foundry industry. This is not only in the perspective of CO₂ reduction based on a near future to fossil resource depletion but also self-sufficient stable energy supply and avoidance of global risks. Significantly, in the cupola operation, through the history of various efforts by each company, we have reduced the coal coke ratio to the limit; in other words, we are controlling it with the minimum origin energy consumption required for melting, so we cannot reduce CO₂ by further reducing coal coke. In this article, we engaged in partially substituting foundry coke with various biocoke that have been developed recently. By partially expending （or substituting） the fuel in the cupola with biocoke made from a variety of different substances, we found the characteristics of operating cupolas and the difference in the maximum substitutional rate for foundry coke related to the substances of biocoke. Moreover, we developed the practical technology for utilizing biocoke. Especially, we have verified that the cupola operation can be operated without problems up to a conditional maximum of 20 mass% substituting of coke for the same calorific value.

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