[en] This research was carried out on a pig farm in the HUNG YEN Province of Vietnam from October 2008 to August 2009. The farm had 36 sows, selling about 1.5 tons of weaned piglets and 33 tons of live weight pigs per year. The piglets (from weaning to 15 kg) consumed on average 0.42 kg of feed/head/day and produced on average 0.25 kg of solid waste/day. The ratio of solid waste to feed consumed was 0.59. Pigs (from 15 to 30 kg) consumed on average 0.76 kg of feed/head/day, and the ratio of solid waste to feed consumed was 0.61. Growing pigs consumed 1.64 kg of feed/head/day and the ratio of solid waste to feed consumed was 0.49. This ratio for finishing pigs (>60 kg) was 0.46 and consumed feed was 2.3 kg/head/day. For the sows, this ratio was 0.43 for all periods including gestation and lactation. Over 24 hours in winter the biogas produced was on average 4.16 m3/day in the 24m3 biodigestor. This was much less than in summer (9.06 m3/day). To create one kW electricity, 0.92 m3 of biogas was needed. Pig manure treatment by biodigestor has considerably decreased some pollutants, including BOD5 (Biological Oxygen Demand) concentration down by 77%, the COD (Chemical Oxygen Demand) concentration down by 83%, the dissolved sulphide concentrations down by 88%, the concentration of heavy metals Cu2+ down by 52%, Zn2+ down by 37%, the Cl- concentration down by 29% and NH4-N down by 52%.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Nguyen Van Duy ; Université de Liège - ULiège > Form. doct. sc. vété. (paysage)
Vu Dinh, Ton
Language :
English
Title :
Studying on pig manure treatment to minimize environmental pollution and Use Bioenergy
Alternative titles :
[en] Studying on pig manure treatment to minimize environmental pollution and Use Bioenergy
Publication date :
25 July 2010
Journal title :
International journal of environmental and rural development
Volume :
1
Issue :
2
Pages :
73-77
Peer reviewed :
Peer reviewed
Commentary :
The coefficients of manure production for different pig categories are considerably different. The results from our farm study show that sows have the lowest coefficient (0.43), followed by fattened pigs from 60 kg to finished (0.46), and pigs from 15 kg to 30 kg have the highest coefficient (0.61). The on-farm produced biogas quantity differed between winter and summer (in summer it was 117% higher than in winter). This was due to lower temperatures in winter which are unfavourable for the development of microorganisms. The coefficient of biogas transformation to electric energy was relatively high (0.92 m3), generating 1 kW. Using biogas digestors can reduce environmental pollution, especially with respect to BOD5 and COD concentrations.
