Étude d'un coagulant organique naturel pour le traitement des eaux potable et usées : le Tanfloc

Authors: Aouba, Nora
Advisor: Dorea, Caetano ChangBouchard, Christian
Abstract: Tanfloc is a tannin extracts-based natural and organic coagulant. Tannin is derived from the metabolism of some plants like Acacia mearnsii which is used in its production. Some studies suggest that Tanfloc offers a reduction performance of dissolved organic matter similar to that of alum for the treatment of surface waters, with the advantage that the pH has no impact on it. Like alum, it can be used in waste water treatment to reduce Chemical Oxygen Demand (COD), Suspended Solids (SS), and Biological Oxygen Demand. Unlike other natural organic coagulants such as Moringa, Tanflloc is seen as the organic coagulant which might be a suitable alternative to inorganic coagulants like alum whose use presents some disadvantages. The objectives of this research were to improve on the knowledge about this coagulant: how it works, its performance; and to investigate its potential use in waste and potable water treatment as compared to alum. As far as potable water is concerned, the results of jar tests on different water sources (St. Lawrence River and Chaudière River) show that Tanfloc’s DOC (Dissolved Organic Carbon) residual does not only degrade treated water quality, but also involves a higher chlorine demand. However, it appears that this COD residue is not a harbinger of disinfection by-products. Moreover, as it is the case with alum, pH variation, dosing, and raw water characteristics have an impact on Tanfloc’s performance. As far as waste water is concerned, although Tanfloc does not reduce total nitrogen and total phosphorus, it can be used in waste water treatment (primary treatment) because our results suggest that it enables a better reduction of COD and SS than alum. Furthermore, the resulting sludge from Tanfloc’s use is organic and this can add to its valuation.
Document Type: Mémoire de maîtrise
Issue Date: 2017
Open Access Date: 24 April 2018
Permalink: http://hdl.handle.net/20.500.11794/28134
Grantor: Université Laval
Collection:Thèses et mémoires

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