Coagulation and flocculation is the important unit process in drinking water treatment. This process aims to
produce water biologically and chemically safe for human consumption. Treated water should be aesthetically
pleasing in terms of odor, appearance and taste. Coagulation allows by the injection and the scattering of chemical
(coagulants) during relatively intense mixing to destabilize naturally occurring particles and macromolecules and/or
to precipitate additional particles [1]. Flocculation permits, by the addition of synthetic or natural polymers in slant
of slow mixture, to promote the aggregation and bind together the micro-flocs of destabilized particles into larger
flocs that can be removed subsequently by sedimentation and/or filtration. However, the use of these chemicals,
particularly aluminum, may have several environmental consequences: (a) human health implications such as
Alzheimer and other disease with carcinogenic properties [2]; (b) production of big volumes of sludges [3]. Use of
synthetic organic polymer coagulants such as polyacrylamides and polyamines are also problematic since they may
be toxic under certain circumstances [4].
Recently, the use of environmentally friendly coagulants widened. They can be proposed as an important
alternative for waters treatment. Natural organic polymers named biopolymers are naturally produced or extracted
from animal, plants tissues or microorganisms. These biopolymers are no toxic for human health and are