298 94 307/02 Untersuchungen zum Stand der Umsetzung des ...

Teil 3 Seite 8-37
storage rooms and containers with the necessary cooling aggregates. For the storage of
the raw material, surrounding temperatures of < 5 °C are recommended; blood is cooled
down to a temperature of < 10°C.
Furthermore, any soiling of the raw material, for instance by dirt, waste, chemicals, ex-
ternal parts (rubber, plastic parts), etc., must be prevented.
In order to prevent impairment of the raw material and pollution during the transport, and
to shorten the time span between production and processing of the raw material, a num-
ber of organisational measures can be met in regard to the vehicles and the transport
routes.
General measures in the plant
In the plant, sufficient processing capacities must be reserved. They are sufficient when
they consider the permitted capacities of the agricultural and slaughterhouse companies
in regard to the raw material and keep capacity reserves free on top of the normal rate of
slaughtered animals for the disposal of animals killed by epidemics. Eventually, spare
parts for parts with high strain must be available in sufficient number in order to avoid
down-times of the plant as much as possible.
The acceptance of new raw material or an enlargement of the catchment area must be
checked in good time in regard to the capacity of the respective wastewater treatment
plant.
Moreover, the raw material must be processed quickly. In case of storage, it must be
kept cool also in the plants. It is particularly important that the raw material mould is emp-
tied completely once a day.
Special measures to reduce the wastewater production
Whereas the amount of the exhaust vapour condensates cannot be influenced due to
the natural water contents of the raw material (provided that not injection condensation is
run), the other production water and rinsing water offer some saving potential, as does the
cooling water.
The sterilisator effluent of the rinsing wastewater of the unclean side should be cooled
indirectly. The rinsing wastewater production can also be reduced if water-saving cleaning
implements are installed in the work rooms. The operation staff should be instructed about
the necessity and the use of economical water consumption.
For the condensation of the exhaust vapours, surface condensators are used which can
be cooled with water or air. For water-cooled condensators, the cooling water should be
recirculated. The operation or air-cooled condensators facilitates not only a lower cooling
water consumption, it can also considerably decrease the energy demand in comparison
to recirculation water cooling.
Special measures to reduce the wastewater loads