volume 38, issue 5, P1173-1182 2004
DOI: 10.1016/j.watres.2003.11.018
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J.C Bourgeois, M.E Walsh, G.A Gagnon

Abstract: Spent filter backwash water (SFBW) and clarifier sludge generally comprise the majority of the waste residual volume generated and in relative terms, these can be collectively referred to as combined filter backwash water (CFBW). CFBW is essentially a low-solids wastewater with metal hydroxide flocs that are typically light and slow to settle. This study evaluates the impact of adding calcium and magnesium carbonates to CFBW in terms of assessing the impacts on the sedimentation and DAF separation processes. R…

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