Article

Floc structure and the role of cations.

Virginia Polytechnic Institute & State University, Blacksburg 24061, USA.
Water Science & Technology (impact factor: 1.12). 02/2001; 44(10):209-13. pp.209-13
Source: PubMed

ABSTRACT Cations have been found to influence the settling and dewatering characteristics of biological sludges. This research was directed at investigating the role of iron in floc stability of sensitivity to shear and in the response to anaerobic and aerobic digestion. Our data shows that iron may contribute to floc strength and it appears that the deterioration in sludge dewatering during anaerobic digestion is associated with the reduction and solubilization of iron. Further, it is the presence of proteins in solution that contributes to poor dewatering and to the demand for conditioning chemicals. The addition of iron for improving dewatering shows that iron may selectively coagulate solution proteins.

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Keywords

anaerobic
 
anaerobic digestion
 
biological sludges
 
Cations
 
conditioning chemicals
 
deterioration
 
dewatering
 
dewatering characteristics
 
poor dewatering
 
proteins
 
sludge dewatering
 

J T Novak