Effect of pH and anion type on the aging of freshly precipitated iron(III) hydroxide sludges
Article Abstract:
A study was conducted on the influence of hydrogen-ion concentration and common anion type on the shift of ferrihydrite to hematite and goethite under controlled laboratory conditions. The aim of such laboratory activities is to optimize aging conditions for iron(III) sludges with the intent of reducing sludge volumes and secondary leaching properties. A correlation was observed between enhanced hematite formation and both the relative affinities of anions for ferrihydrite particles and their relative aqueous phase complex stability constants.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Use of the solubility domain approach for the modeling of the hydroxide precipitation of heavy metals from wastewater
Article Abstract:
The solubility domain principle is a valid approach for predicting effluent treatment quality assurance standards for the hydroxide precipitation of Zn2+, Pb2+ and Fe3+ from different wastewater composition types. Precipitated phases isolated from systems representing the upper and lower limits of potential effluent chemical compositions were used as bases for solubility domain calculations. The selection of the solid-phase and aqueous-phase species is crucial in the accuracy of domains in predicting observed solubilities.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Effect of Ca2+, Mg2+, and anion type on the aging of iron(III) hydroxide precipitates
Article Abstract:
A study on the effects of Ca2+, Mg2+ and other anion types on the aging of iron(III) hydroxide precipitates in domestic water treatment showed Ca2+, and Mg2+ to significantly retard the state of tranformation in the precipitation process. The significance of this retardation is in the formation of sludge, and its implications in sludge handling and disposal. A retarded transformation results in more compact and dense sludge that decreases volume and improves handling of the formed sludge.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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