Optimisation of coagulation/flocculation for pre-treatment of high strength and saline wastewater: Performance analysis with different coagulant doses

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[1] Di Bella, G.
[2] Giustra, M.G.
[3] Freni, G.
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Di Bella, G. (gabriele.freni@unikore.it) | 1600年 / Elsevier B.V., Netherlands卷 / 254期
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In this study; the coagulation and flocculation processes were evaluated in the treatment of slops with the aim of reducing the organic concentration in the pre-treated influent; as measured by Chemical Oxygen Demand (COD); Total Organic Carbon (TOC) and Total Petroleum Hydrocarbons (TPH). The coagulation was optimised for the wastewaters sampled from a floating tank of an oil costal deposit in the Augusta Harbour (Sicily-Italy). The jar test experiments were run at 200 rpm for 1 min; 30 rpm for 20 min and settling for 180 min. Two different trivalent salts were used as the coagulant: FeCl3 and Al2(SO4)3×18H2O. To limit the residual concentration of Al and Fe after coagulation; a low coagulant dose was used. Furthermore; both anionic and cationic polyelectrolytes were used as flocculating agents. In general; the application of the coagulation process with low coagulant doses was effective in the pre-treatment of the slops. In fact; the percentages of removal; although rarely exceeding 70-80% (in term of TOC); reduced the organic load resulting from recalcitrant or poorly biodegradable substances. In particular a pre-treatment; with aluminium sulphate is more versatile for the removal of the main contaminants; that can hinder the performance of subsequent biological processes. © 2014 Elsevier B.V;
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