Hygienic aspects of livestock manure management and biogas systems operated by small-scale pig farmers in Vietnam

TY - JOUR

T1 - Hygienic aspects of livestock manure management and biogas systems operated by small-scale pig farmers in Vietnam

AU - Luu, Huong Quynh

AU - Madsen, Henry

AU - Anh, Le Xuan

AU - Ngoc, Pham Thi

AU - Dalsgaard, Anders

PY - 2014/2/1

Y1 - 2014/2/1

N2 - Biogas digesters are widely promoted and increasingly used to treat and generate gas from pig slurry worldwide. The objective of this study was to describe manure management practices with focus on biogas digestion among small scale pig farmers in Hue (50 farmers) and Hanoi (96 farmers) and to assess fecal contamination levels in biogas effluent. Results showed that 84% of the farmers in Hanoi and 42% in Hue used both pig slurry and human excreta for biogas production. Biogas digestion only reduced E. coli concentrations by 1 to 2 log units to 3.70±0.84 Escherichia coli (log10) cfu/ml on average in effluent as compared with raw slurry. Biogas effluent was commonly used to fertilize vegetables or discharged directly into the garden or aquatic recipients. Reduced problems with bad smells and flies were reported as main reasons for establishing a biogas digester. Further studies are needed to assess human and animal health hazards associated with the discharge and use of biogas effluent from small-scale biogas systems.

AB - Biogas digesters are widely promoted and increasingly used to treat and generate gas from pig slurry worldwide. The objective of this study was to describe manure management practices with focus on biogas digestion among small scale pig farmers in Hue (50 farmers) and Hanoi (96 farmers) and to assess fecal contamination levels in biogas effluent. Results showed that 84% of the farmers in Hanoi and 42% in Hue used both pig slurry and human excreta for biogas production. Biogas digestion only reduced E. coli concentrations by 1 to 2 log units to 3.70±0.84 Escherichia coli (log10) cfu/ml on average in effluent as compared with raw slurry. Biogas effluent was commonly used to fertilize vegetables or discharged directly into the garden or aquatic recipients. Reduced problems with bad smells and flies were reported as main reasons for establishing a biogas digester. Further studies are needed to assess human and animal health hazards associated with the discharge and use of biogas effluent from small-scale biogas systems.

UR - http://www.scopus.com/inward/record.url?scp=84885973372&partnerID=8YFLogxK

U2 - 10.1016/j.scitotenv.2013.09.023

DO - 10.1016/j.scitotenv.2013.09.023

M3 - Journal article

C2 - 24140681

AN - SCOPUS:84885973372

SN - 0048-9697

VL - 470-471

SP - 53

EP - 57

JO - Science of the Total Environment

JF - Science of the Total Environment

ER -