Feedstuff of Food Garbage by the Rapid Steam Drying

스팀 고속건조에 의한 음식물쓰레기의 사료화에 관한 연구

When the food garbage of general hospital was dried by the rapid steam drying process, the water content was changed to 1.3% from 77.8~82.8%. In this experiment, weight reduction rate was 80%, and electricity consumption was 2.4Kwh. Dried compost from this rapid steam drying process was brown pellets, which was consist of 27.77% crude protein and 3.19% crude fiber. Even though these pellets were slightly short of crude fat and crude ash content, these were analysed as a possible supplementary feed for pig. On the condition of drying food garbage mixed with 5% pulverized chaff, the necessary drying time was shortened by 1 hour, weight reduction rate was 76%, and reduction rate of electricity consumption was 42%. But contents of crude fiber and crude ash were increased to about 2 times. In case of adding new food garbage continuously to the composted food garbage mixed with 3.4% pulverized chaff, weight reduction rate and contents of crude fiber and crude ash were decreased gradually, but contents of crude protein and crude fat were increased. In case of composting food garbage from buffet, both drying time and electricity consumption were reduced, and ingredients of compost were higher than that of assorted feed for pig in the market.

함수율이 77.8~82.8%되는 종합병원의 음식물쓰레기만을 스팀건조공법에 의해 4시간동안 건조시켰을때 1.3%의 함수율로 80%의 감량을 보였으며, 소비전력은 2.4kw였다. 건조물은 갈색의 페렛트 상태로서, 조단백질은 27.77%, 조섬유는 3.19%고, 양돈용 사료로서의 조지방과 조회분함량은 약간 부족했으나 보조사료로서는 가능성이 있는 것으로 나타났다. 건조시간을 단축하기 위해 5%비율로 분쇄왕겨를 혼합해서 건조시켰을때 1시간이 단축되었고, 76%의 감량율에 전력소모도 약 42% 정도 절약할 수 있었다. 그러나 조섬유와 조회분 함량은 약 2배 정도 증가되었다. 그리고, 음식물쓰레기에 분쇄왕겨를 3.4% 비율로 혼합해서 건조시키고, 그 건조물에 새로운 음식물쓰레기를 혼합해서 연속적으로 건조기를 운전했을때 감량율은 점점 적어졌고, 조단백질과 조지방의 함량은 증가되는 반면에 조섬유와 조회분 함량은 점점 감소되었다. 한편, 부페식 음식쓰레기는 건조시간도 빠르면서 전력소비도 적었고, 사료화 성분에서도 시중에 유통되고 있는 양돈용 배합사료 이상의 함량을 보였다.