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 ?
Comparative diagrams of the performance of coagulants in removing turbidity (NTU) and TOC of samples:
My study indicates that clarification of turbid water with natural coagulants from plant material (seeds) combined with use of solar radiation (on a black-painted roof for 8 hours) could provide a simple low-cost water treatment method for rural communities in Tanzania.
Coagulants which were used here are divided into two groups: minerals and polymers.
Post-lime feed costs for the alternative coagulants were based on estimated lime usage determined using the Rothberg, Tamburini, & Winsor Model for Water Process and Corrosion Chemistry, version 4.
Therefore, it can be envisaged that, the lime could be very useful for post disinfection of water treated with coagulants prior drinking especially in poor households where drinking water is stored under unhygienic conditions.
The formation of the hydrolytic products formed from metal salt coagulants occurred in a very short time and they are readily absorbed onto the colloid particles and then cause destabilization of their electrical charge.
Table 59: French Historic Review for Drinking & Wastewater Treatment Chemicals by Product Segment - Corrosion- & Scale-Inhibiting Chemicals, Coagulants & Flocculants, Biocides & Disinfecting Chemicals, Filter Media & Adsorbent Chemicals, Softeners & pH Adjustors, Fluoridation Agents and Antifoaming Agents Independently Analyzed by Annual Sales for the Years 1991 through 2000 in US$ Million (includes corresponding Graph/Chart) III-48
While privatisation of Hungary's municipal water treatment system is driving demand for coagulants and flocculants, robust economic growth and building projects for plants are key factors driving the demand in the Baltic States.
For instance, the entire structure of the water treatment market for coagulants and flocculants will change as a direct consequence of the directive.
Frost & Sullivan says this increase in demand is expected to drive revenues in the market for coagulants and flocculants from EUR 62.
Contract award: supply polymer flocculants and coagulants for purifying treatment-on-lot sewage stations 11: provision of polymers for sludge dewatering of the sewage treatment station of crespin.
Executive Summary Research Scope and Definitions Industry Challenges and Market Forces Total Industrial Water and Wastewater Treatment Chemicals Market Corrosion and Scale Inhibitors Market Coagulants and Flocculants Market Disinfectants and Biocides Market pH Adjustment Chemicals Market Defoamers and Anti-defoamer Chemicals Market Other Chemicals Market Major Competitor Profiles Opportunity Analysis and Strategic Recommendations