Application of the precipitation-charge neutralization model of coagulation

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00172a013· OSTI ID:6616584

Dentel, S K

A quantitative model is considered that develops predictions of suspension stability on the basis of electrokinetic characteristics of colloid material prior to and following coagulation. The model is applied in this paper to coagulation with aluminum sulfate and other aluminum salts. The effect of increasing particle surface area on coagulation is first modeled for a system containing particulate silica, but of varying size and concentration. Experimental results show a correlation of turbidity removal to attainment of near neutral zeta potential in zone 2 coagulation, and the calibrated model successfully predicts this zone. The model is then used to describe the coagulation of waters containing humic substances by considering them as small colloids with a substantial contribution to surface area in the system. Finally, it is shown that the model can be employed to describe the performance of polyaluminum coagulants as well.

• Research Organization: Univ. of Delaware, Newark (USA)
• OSTI ID: 6616584
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 22:7; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALUMINIUM COMPOUNDS
COAGULANTS
COLLOIDS
DISPERSIONS
DRUGS
FLOCCULATION
HEMATOLOGIC AGENTS
HUMUS
MATHEMATICAL MODELS
PRECIPITATION
SEPARATION PROCESSES
SURFACE AREA
SURFACE PROPERTIES
TURBIDITY