Slaughterhouse waste is usually converted into bone- blood- and meat meal which can be used for animal feed.
present data refer to bone, blood and meat meal production in
Different production methods are applied in the industry,
but some of
processes are following: 1) by-products from slaughterhouses (bones, heads,
intestines, feathers, skins etc.) are transported to the factories in closed
containers, 2) the products are minced, 3) the "mincemeat"
is coagulated by heating (80-90oC) 4) liquid and solid
material is separated by pressing, 5a) the solid fraction is dried (110oC),
6a) the dry product is screened,
and stored for distribution, 5b) the wet fraction is heated (105oC)
and fat is separated, 6b) fat is sterilised (125oC),
packed and stored for
distribution. The wastewater generated
during the process is either treated completely and emitted to recipient or
treated to some extent and diverted to further treatment in municipal
wastewater treatment plants. Ventilation
air is treated in bio-filters. Bone, blood and meat meal
from healthy animals has traditionally been used for animal feed. However,
use of the products for feed has been banned in EU since 2000 due to
fear of BSE and the products are currently incinerated.
Average data for all products (bone, blood and meat meal) produced from all kinds of raw materials (bones, heads, intestines, feathers, skins etc.) have been extracted from daka's green account 1999/2000. Data on emissions to water are derived from daka Randers where wastewater is emitted to marine recipient after complete treatment.
All production processes as well as administration, product storage, waste water treatment and air treatment are included. Maintenance of equipment, use of cleaning agents and chemicals are not included. Packaging is not included.
daka has large share of the Danish market and the data are very representative to average production of bone-, blood- and meat meal produced from average raw materials in Denmark. However, the energy consumption for specific raw materials and specific products vary significantly (primarily due to different water contents of the raw materials) and the present data do not represent specific raw materials and specific products accurately.
Data from three different daka factories (Randers, Løsning and Lunderskov) vary but are in the same order of magnitude.
Inputs and outputs associated with bone, blood and meat meal are shown in the table below. Data are provided per ton of raw material entering the factory.
daka (1999/2000): Green account (in Danish).