Coagulants


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Coagulants

 

(coagulating agents), substances that cause coagulation—that is, adhesion of particles—when introduced into a fluid medium containing tiny particles. Large masses of cohering particles formed by coagulation are precipitated in the form of flakes or lumps (coagulum). The salts of polyvalent metals, such as aluminum and iron, are effective coagulants for systems with an aqueous dispersion medium. Macromolecular, water-soluble organic compounds (polymers), especially poly-electrolytes, are also used as coagulants. Unlike inorganic coagulants, they are sometimes called flocculants. Coagulants are used to separate commercially valuable products from the waste products of a variety of industrial processes and to eliminate natural and household pollutants from water.

In medicine, coagulants are agents that increase the coagulability of blood—for example, vicasol, gelatin solution, and some preparations obtained from blood (thrombin and fibrinogen).

References in periodicals archive ?
Two techniques are widely used to determine optimum dosage of coagulants, namely, specific equipment in zeta-potential measurements and jar tests (Joo, Choi, & Park, 2000).
In addition to the Clearlogx technology, H2O Innovation will purchase Clearlogx's business related to the sale of coagulants for conventional and membrane filtration systems.
2009) examined the performance of coagulants in advanced coagulation conditions of turbidity and organic matter removal of a river in Karaj.
Thus, this research was designed to study efficiency of ferric chloride ferric and poly ferric sulfate coagulants in removal of turbidity and reduction on organic matter input to Ardabil Treatment Plant.
Production of large sludge volume, reduction in pH and low efficiency of coagulation are some of the problems faced with these coagulants [9, 10].
It is well known that the coagulants could enhance primary treatment in municipal wastewater treatment plants, thereby reducing the cost of the secondary treatment stage.
The coagulation process was carried out at different dosage of coagulants, different water turbidities (low turbidity = 50 NTU; medium turbidity = 250 and high turbidity = 500 NTU) and different water pH (4.
The chemical properties and the physical properties for alum and ferric chloride coagulants used for the coagulation process are tabulated in Table 2 and the physical properties of the polyacrylamide coagulant aid used in the flocculation process is also tabulated in Table 2.
For instance, pre-ozonated water is mixed with a coagulant in the flocculators to aid the production of large flocs, which are floated more easily in the subsequent CoCoDAFF process.