A good question. The landfill approach is another area to discuss. Prof. Maekawa pointed out that there are other affects of landfill. Since there are no more questions let us move to Dr Wiloso from Indonesia, who will discuss biogas production. Dr Matsumura will give a commentary.
Hot water is used, because Indonesia is very hot.
In Hokkaido in the winter the temperature is very low, so psychophilic methane producing microorganisms should be developed for this type of fermentor. For biogas production to use a water hyacinth directly as a substrate and carbon source. In the southern area of Japan, for example, Kagoshima, this is used for dairy and cattlefeed. Their waste is supplied to the methane fermentor. What do you think of this system.