Author/Editor		Jurkovič, J; Janežič, Lidija
Title		Okolju prijazna farmska reja prašičev
Translated title		Enviroment friendly farm raising of pigs
Type		članek
Source		In: Rečnik M, Verbič J, editors. Zbornik posveta kmetijstvo in okolje; 1998 mar 12-13; Bled. Ljubljana: Kmetijski inštitut Slovenije,
Publication year		1998
Volume		str. 483-7
Language		slo
Abstract		In 1995 an anaerobic pretreatment plant for pig slurry from the Farma Ihan was put into operation. With a recycling channel flushing system, water was replaced by the liquid part of the slurry and the daily amount of the slurry was reduced from more than 700 m3 to less than 300 m3. Mechanical separation provides elimination of solid parts, whereas the liquid part is pumped into four (4 x 1250 m3) CSTR digestors, made of concrete, with a running temperature of 38degreeC and HRT of 22 days. After digestion ca. 70 % of the daily input is centrifuged following addition of flocculants. In the paper the efficiency of the pretreatment plant in last six mounth is presented. On average 40 tons of organic fertilizer and almost 4000 m3 of biogas (71 % CH4) were achieved daily from less than 300 m3 of the slurry. The COD reduction of anaerobic digestion was up to 80%. Regarding the fact that the digested material is very highly loaded with nitrogen, the anaerobic pretreatment plant has to be upgraded with a nutrient removal stage before connection to the municipale WWTP.
Descriptors		SWINE ANIMAL HUSBANDRY WATER PURIFICATION NITROGEN