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SNF's flocculants and coagulants cover the global market needs of wastewater treatment, production of drinking water, production of dewatered sludge. Thanks to SNF Canada's local distributors and technical teams, customers have an optimal choice of appropriate reagents.
In the case of water treatment, two types of polymer may be considered:
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Organic coagulants (e.g. polyamines, polyDADMAC, etc.) are used for treating water with low suspended solids content and they replace (completely or partly) the inorganic coagulants (e.g. aluminum sulphate, aluminum polychloride and ferric chloride).
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Organic flocculants, especially polyacrylamides and polyethylene oxides, are used for settling.
Two types of treatment are used:
1. Biological treatment, which generally comprises four main steps:
- preliminary treatment for removing the coarsest solid particles by screen cleaning;
- primary treatment for removing suspended solids by settling or flotation;
- aeration in order to form biological flocs;
- secondary treatment for settling the biological flocs;
2. Physico-chemical treatment in which the water is treated directly by a coagulant and a flocculant. The sludge is then dewatered by filtration or centrifugation using a flocculant. This method is often used as an intermediate step.
SNF Canada's flocculants can be used at various steps in these processes: primary or secondary settling tanks or thickeners, but their most common use is for sludge dewatering by filtration or centrifuging.
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