Message-ID: <01BD8E6E.5F59A860@dialup237-1-27.swipnet.se> Date: Tue, 2 Jun 1998 21:26:42 +0200 From: Jacky Foo <mailto:foo@SWIPNET.SE> Subject: animal manure management and processing To: mailto:DEVEL-L@AMERICAN.EDU
Invitation to participate on a paper discussion from the Internet Conference on Integrated Bio-Systems (http://home2.swipnet.se/~w-25860/icibs/prog-reg.htm) contact: mailto:foo@swipnet.se
Date: 01 June-26 June 1998 Title of Paper: Manure surplus processing at the farm level and in coordinated groups of farms Presented by : Giuseppe Bonazzi & Sergio Piccinini (Italy)
URL of Paper: http://home7.swipnet.se/~w-75166/icibs/bonazzi Mailing list address: mailto:et-w6@segate.sunet.se URL of list: http://segate.sunet.se/archives/et-w6.html Registration: e-mail mailto:listserv@segate.sunet.se and write : SUB ET-w6 yourfirstname yourlastname, organization e.g. sub et-w7 Giuseppe Bonazzi, CRPA, Italy
Abstract :
Manure surpluses in pig farms can be reduced by separation of the solid fraction from the slurry. The solid fraction can be exported to long-distance areas with a high demand for fertilizers, thus reducing the farm surplus. To make the offer of solid fractions more attractive to the farmers outside the surplus areas, composting could be a solution. The fertilizing value is increased despite the volatilization of the ammonia fraction during the composting process. Nitrogen loss can be limited by means of adding suitable bulking materials, for instance straw or shredded pieces from trimming. To further reduce nitrogen surplus, an aerobic treatment of the liquid fraction resulting from the solid separation can be adopted.
This paper reports the results of trials on a pilot plant performing nitrification, denitrification and enhanced biological phosphorus removal. Results on a farm-scale purification plant specifically designed for pig slurry treatment are also reported.
As regards the group operations, we report the case of a consortium system of pig slurry management in an area with a high livestock density. In about 25 farms with 87,000 places for 80 kg pigs, about 808,000 kg of surplus N per year are produced, with reference to the available agricultural land of the area.
Seven of the largest farms agreed to take part in a coordinated programme of slurry management which aims to reduce about 80% of the N surplus. All the farms carry out raw slurry centrifuging and solid fraction composting, and a cooperative service for collecting and transporting the resulting compost out of the area has been established.