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Throughout the paper, the term “flocculation” is used to refer to the entire coagulation–flocculation process (as common practice in similar studies). Similarly, the chemicals used in this process are referred to as “flocculants” regardless of their chemical properties (flocculant or coagulant). 2. Materials and methods 2.1.
A physicochemical treatment (coagulation–flocculation) was applied to a slaughterhouse wastewater, using anionic polyacrylamide as coagulant aid to improve the settling velocity of the flocs formed with the coagulants used: ferric sulphate, aluminium sulphate and polyaluminium chloride.
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Chemical Coagulant and Flocculant. Anthony S. Greville. Easy Treat Environmental. Abstract In many water treatment processes the selection of the chemical regime is of critical importance. The mechanical equipment will remove water contaminants to a reasonable level, but to meet the increasingly stringent Federal and Provincial licensing ...
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For example, a flocculant may be used in swimming pool or drinking water filtration to aid removal of microscopic particles which would otherwise cause the water to be turbid (cloudy) and which would be difficult or impossible to remove by filtration alone. Many flocculants are multivalent cations such as aluminium, iron, calcium or magnesium.
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Once the pH was selected and with the same coagulant dose, the dose of polyelectrolyte used as coagulant aid was varied between 0 and 100 mg l-1. When anionic polyelectrolytes are used as coagulant aids in conjunction with metal salts, they are usually added after the coagulant due to the negative charge of the particles in the wastewaters,