Remediation potential of Compost and Vermicast - Revision history

Mqmallonga at 04:25, 11 February 2012

2012-02-11T04:25:19Z

← Older revision		Revision as of 12:25, 11 February 2012
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	Column experiments showed 99% removal of Cu2+and higher than 84% in the presence of Cr6+. With Fe2+, precipitation of Fe(OH)3 occurred. The column breakthrough time to meet the 2008 DENR Proposed Effluent standard for Cu2+ was 18.23 min (25g compost and 1000 mg L. -1feed at 5 mL min-1). Sequential extraction of contaminated samples revealed that Cu2+and Cr6+ were at least 40% mobile and available once sorbed in the samples while Fe2+was released mostly only when reduced.		Column experiments showed 99% removal of Cu2+and higher than 84% in the presence of Cr6+. With Fe2+, precipitation of Fe(OH)3 occurred. The column breakthrough time to meet the 2008 DENR Proposed Effluent standard for Cu2+ was 18.23 min (25g compost and 1000 mg L. -1feed at 5 mL min-1). Sequential extraction of contaminated samples revealed that Cu2+and Cr6+ were at least 40% mobile and available once sorbed in the samples while Fe2+was released mostly only when reduced.

			Subject Index : Subject Index : Vermicomposting , Sewage—Purification—Hazardous waste removal


	[[Category: Theses]]		[[Category: Theses]]
	[[Category: Environmental Engineering Thesis]]		[[Category: Environmental Engineering Thesis]]
	[[Category: College of Engineering Thesis]]		[[Category: College of Engineering Thesis]]

Mhmisolas: REMEDIATION POTENTIAL OF COMPOST AND VERMICAST moved to Remediation potential of Compost and Vermicast

2011-09-07T05:51:51Z

Remediation potential of Compost and Vermicast moved to Remediation potential of Compost and Vermicast

← Older revision		Revision as of 13:51, 7 September 2011
(No difference)

Mhmisolas: New page: '''Dale A. Fuertes''' (MS Graduated: 2nd Sem 2008-2009) '''Abstract''' Compost and vermicast were evaluated as sorbents for the removal of heavy metals (Cu2+, Cr6+, and Fe2+) from acidi...

2011-09-07T05:51:16Z

New page: '''Dale A. Fuertes''' (MS Graduated: 2nd Sem 2008-2009) '''Abstract''' Compost and vermicast were evaluated as sorbents for the removal of heavy metals (Cu2+, Cr6+, and Fe2+) from acidi...

New page

'''Dale A. Fuertes'''
(MS Graduated: 2nd Sem 2008-2009)

'''Abstract'''

Compost and vermicast were evaluated as sorbents for the removal of heavy metals (Cu2+, Cr6+, and Fe2+) from acidic mine water. Characterization revealed high action exchange capacity, total organic matter content, calcium carbonates, high moisture and water holding capacity, irregular morphology, surface functional groups, and colonies of microorganisms. In addition to these, samples have high base saturation and slightly acidic pH.

Sorption was significantly affected by pH. Compost has highest adsorption intensity for Cu2+ (0.8318 dm-3g-1at pH 3), and vermicast with Fe2+ (1.884 dm-3g-1at pH 2.5). All metals followed Freundlich isotherm model which suggested physisorption mechanism. This was supported by calculated heats of adsorption values. The best fir kinetic model was pseudo-second order indicative of surface adsorption as rate limiting reaction. Intra-particle diffusion model was obeyed by Cu2+ and Fe2+.

Column experiments showed 99% removal of Cu2+and higher than 84% in the presence of Cr6+. With Fe2+, precipitation of Fe(OH)3 occurred. The column breakthrough time to meet the 2008 DENR Proposed Effluent standard for Cu2+ was 18.23 min (25g compost and 1000 mg L. -1feed at 5 mL min-1). Sequential extraction of contaminated samples revealed that Cu2+and Cr6+ were at least 40% mobile and available once sorbed in the samples while Fe2+was released mostly only when reduced.

[[Category: Theses]]
[[Category: Environmental Engineering Thesis]]
[[Category: College of Engineering Thesis]]