PHÂN LẬP VÀ TUYỂN CHỌN MỘT SỐ VI SINH VẬT TỪ PHÂN VOI ỨNG DỤNG TRONG XỬ LÍ VỎ CÂY NHA ĐAM TẠO THÀNH PHÂN COMPOST

Abstract

In Vietnam, elephants are commonly found in the Central Highlands, especially Dak Lak province. Elephants consume up to 300 kg of fiber-rich, cellulose-rich feed and release 100 to 130 kg of feces per day. In this paper, we selected microbial strains from elephant feces with the potential to degrade cellulose-rich agricultural waste to use elephant feces in the waste treatment process. The results of isolation and purification of microorganisms from fresh elephant dung samples show that there are 11 strains of bacteria and 3 strains of fungus. These strains were tested for their cellulose-degrading activity and identified by the MALDI TOF method and by Bergey's taxonomy method. The identification results show that there were two strains of Staphyloccoccus aureus, five strains of Bacillus subtilis, and two strains of fungus: Aspergillus fumigatus and Aspergillus niger. After being identified , strains were tested for proliferation and mixed with maltodextrin, rice bran, and corn bran at the ratio 2:5:3 to create a bioproduct with microbial density of 1x10¹⁰ CFU/g. The result of evaluating the composting of the bioproduct obtained on aloe vera bark in a laboratory is positive. This study will be a foundation for further studies in using bioproducts derived from elephant dung to help improve the environment.