Biomass is the local resources and its utilization contribute to regional revitalization including agriculture, forestry and fisheries. Furthermore, because of the characteristics of the carbon neutral, a variety of biomass utilization is promoted as a national policy to create a sustainable society and prevent global warming. However, because there would be a cause of odor problem especially in the facility to deal with waste biomass, it is necessary to pay enough attention to the design, construction and operation management of the facility.

In order to accelerate composting, aeration is applied to maintain aerobic conditions. However, if aeration is insufficient, anaerobic conditions develop. Large amounts of ammonia are generated under aerobic conditions. Conversely, anaerobic conditions result in the production of various forms of malodorous compounds that are mainly composed of partially oxidized organic compounds with low odor thresholds. Among malodors, nitrogen- and sulfur-containing compounds can be deodorized by oxidation through the action of nitrogen- and sulfur-oxidizing bacteria, although these bacteria exhibit extremely low activity under thermophilic composting conditions. Utilizing microorganisms for the reduction of odor emission during composting requires a thorough understanding of the composting mechanisms.

It is Raw materials acceptance process for receiving the raw materials to the construction of composting facilities, pre-processing (mixing) process, in the fermentation process by the primary fermentation, it becomes a secondary fermentation, there is a storage process, bagging process. Although all these steps is important, traditionaly There are a lot of composting facility of only fermentation ,process of only compost building in, pre-treatment and lack of order to a good aerobic fermentation, virtuous by the forward turning shortage at the time of fermentation temper fermentation is inhibited, not only cannot be but good compost, is seen many facilities that would put a lot of bad smell. It is necessary adding the steps required in order to improve these things, by using the care in the necessary steps may be considered in a newstyle, promotes good composting, it will be reduce odor.

Facilities to utilize biomass tend to emit odor typically from sources such as decaying organic matter. Strict odor control measures are thus needed, for example, to suppress, effectively capture and properly deodorize odor. Although biogasification facilities for food waste are regarded as promising from the energy recovery viewpoint, their deodorization equipment has generally been designed, in the scarcity of knowledge on compounds of odor generated in such facilities, referring to the standards for sewage or night soil treatment plants which primarily target sulfur-base odorous compounds. This prompted us to perform a study, for the purpose of appropriately designing deodorization equipment for biogasification facilities, on odorous compounds generated by garbage-receiving hoppers, solubilization tanks, dehydrators, dryers and composting fermentation apparatus, which emit a highly concentrated odor peculiar to biogasification facilities.

In the odor-index controlled area, even a fragrant exhaust smell from a fermented factory has been controlled. We tried deodorization by a non-filling water scrubber (treated gas volume: 47780m³/h; circulating water volume: 850L/min; drainage volume: 1.2m³/day; contact time: 1.7 sec) as a deodorization for bread-baking exhaust odor added with a fermented butter. As a result, our 1-year field work revealed that the deodorization efficiency was stable at 60～80%, and that the input of a quaternary ammonium compound up to 500mg/L in a circulating water tank was effective in suppression of slime formation.

The removal of lower aldehydes from exhaust gases is important because of its potential environmental effects. The surface modified activated carbon by the combination of urea and sulfuric acid, is employed as adsorbent. Urea reactivity with aldehydes is catalytically promoted by sulfuric acid. The removal performance of adsorbent is studied by batch wise and fixed bed procedures. The chemisorption mechanism of aldehydes is believed that aldehydes react with urea and form urea-derivatives on the adsorbent surface. The adsorbent maintains initial removal performance for at least one year. The removal of aldehydes in the coexistence of aromatic hydrocarbons such as xylene, is successfully realized in the field.