Recovery of solid materials from food processing
wastes and water
Adjustment to comply with water quality regulations
is one of the major challenges of the food industry in
recent years [35]. Organically rich euents from food
processing plants are characterized by high chemical
oxygen demand (COD) or biochemical oxygen demand
(BOD) and total suspended solids [88]. Recovery of
suspended solids by coagulation and settling may also
be cost eective for reducing surcharges [29, 30, 34] in
terms of their potential utilization [88].
The concept of using anity interactions, mainly for
isolation of waste materials from food processing waste,
is very attractive because a high resolution technique is
used initially in the puri®cation scheme, thereby making
it possible to reduce the volume of sample handled in
later steps [89]. During the past decade increasing
attention has been paid to the polyelectrolytic coagulants
of natural origin.
Chitin and chitosan as coagulation and ¯occulation
substances in food processing waste water
Chitosan, with its partial positive charge, can eectively
function as a polycationic coagulant in wastewater
treatment [90]. Chitosan as a coagulating agent for