Schultheisz and Karpati (1984) summarise technology
improvements relating to water use and
waste minimisation in the US up to 1977. The trend
is clearly towards the choice of processes which
reduce waste quantity and strength, particularly
improved blood recovery, dry paunch dumping and
regulated water use. Unfortunately, more recent surveys
are not available. The emergence oflow-temperature edible-rendering systems has been
especially constrained by the very strong wastewater
generated (Cooper & Russell, 1988).