The medium production came from digesters of 50 %CD + 50 %GD - L for the one-stage and L for the twostages. After one month, the percentage of CH4 was high enough for burning and almost giant dirt was digested that limited of a blockage inside the digesters. The results showed that cofermentation of GD and CD is an alternative for livestock raising households to produce biogas for energy purpose. | Journal of Science and Technology 54 (2A) (2016) 287-292 STUDY ON CO-FERMENTATION OF COW DUNG AND GIANT DIRT IN SEMI-CONTINUOUS ANAEROBIC DIGESTER Nguyen Le Phuong1, 2, Thach Hai2, Nguyen Van Liem2, Duong Ngoc Tram2 Nguyen Thi Ngoc Trang2, Kim Lavane2, Nguyen Vo Chau Ngan2, 3, * 1 Hau Giang Industrial Zone Authority, Hau Giang province, Vietnam 2 College of Environment and Natural Resources, Can Tho University, 3/2 Street, Ninh Kieu District, Can Tho city, Vietnam 3 Department of International Relations, Can Tho University, 3/2 Street, Ninh Kieu District, Can Tho city, Vietnam * Email: nvcngan@ Received: 10 June 2016; Accepted for publication: 20 June 2016 ABSTRACT Study on co-fermentation of cow dung (CD) and giant dirt (GD - Pistia stratiotes L.) in semi-continuous anaerobic digester aims to test biogas quantity and quality by time. Three mixing rates counted based on ODM of each material were chosen: 100 %CD, 50 %CD + 50 %GD, and 100 %GD. The experiments were set up in laboratory conditions with two types of digesters: one-stage digesters and two-stage digesters (triplicate for each treatment). After 80 days, the biogas produced from the one-stage digesters was not significantly different to the twostage digesters with similar input material. The highest production of biogas came from digesters of 100 %GD - L for the one-stage and L for the two-stages. The medium production came from digesters of 50 %CD + 50 %GD - L for the one-stage and L for the twostages. After one month, the percentage of CH4 was high enough for burning and almost giant dirt was digested that limited of a blockage inside the digesters. The results showed that cofermentation of GD and CD is an alternative for livestock raising households to produce biogas for energy purpose. Keywords: anaerobic semi-continuous digester, cow dung, giant dirt, one-stage digester, twostage digester. 1. INTRODUCTION Cattle and buffaloes are two most important ruminant .
