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An Assessment of the Efficacy of Sodium Carbonate for Semi-passive Treatment of Circumneutral Zinc-bearing Mine Waters by J. Kennedy; J. Dean; I. Okeme; D. Sapsford is a Environmental Science article available to read on EtoBox.

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This study reports on the novel application of sodium carbonate dosing specifically for the semi-passive precipitation of Zn from circum-neutral mine water and demonstrates the use of Na2CO3 as a readily available, safe to handle reagent which can precipitate Zn at pH within environmental quality standards. >95 % Zn removal was achieved for each mine drainage investigated, requiring differing dosages of Na2CO3 with residual Zn concentrations <1 mgL−1. Geochemical modelling and precipitate characterisation using XRD, SEM-EDS, TGA and full chemical digest suggests that the precipitate predominantly comprised of hydrozincite. Laboratory trials demonstrated that (i) adding the precipitant dropwise could reduce the sludge volume by circa 50 %, and (ii) That following a laboratory protocol for simulating type II High Density Sludge (HDS) process resulted in substantial decreases in sludge volumes compared to single pass sludge, with 5.3 mL per litre mine water treated compared to 55.3 mL per litre for conventional single pass treatment after 25 cycles. Such reductions in sludge volume are a very advantageous outcome for practical applications. Particle size distribution and zeta potentia

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Author

J. Kennedy; J. Dean; I. Okeme; D. Sapsford

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)