Study on recovery of biogas from mixed biowaste for regional biogasification system

Abstract

Even in Japan, the energy recovery from a waste became the importance by not only waste
treatment problem but also environmental problem which carbon dioxide (CO2) causes. The
energy recovery is being measured from organic waste. However, the construction of the
disposing facility does not advance in actually various factors. As the one factor, the property of
a organic waste variously changes by the discharge source such as home, food shop, super
market, farm, sewage treatment plant, etc., and the energy recovery ratio changes with it. In this
study, the biogas generation of the waste which arose actually was obtained experimentally. In
addition, the following were examined using waste generation in the region and the biogas from
biowaste : Electric power recovery, heat recovery, CO2 emission. In the garbage discharged, the
gas generation magnification showed the very high, The gas yields seemed to be very high for
biowastes, since these is originally offered as foods. In case of the livestock manure, the gas
yield over about 16 times per manure was obtained. The gas yield is not very dependent on the
organic substance content. This cause the bedding was included in the manure, and it seemed to
affect the organic substance content by the content and type. In case of the sewage sludge, the
gas yield of about 3.5 times per sludge was got. As a result of the trial based on the waste
generation in the region, electric power, heat can be utilized effectively. In addition, that the
reduction was also possible on CO2 emission clarified.