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Comparison of reactive porous media for sulfur-oxidizing denitrification of high nitrate strength wastewater

Paper ID Volume ID Publish Year Pages File Format Full-Text
3688 182 2011 8 PDF Available
Title
Comparison of reactive porous media for sulfur-oxidizing denitrification of high nitrate strength wastewater
Abstract

Three packing materials for sulfur oxidizing denitrification packed bed systems seeded with acclimated anoxic sludge were evaluated. Two porous media were prepared via thermal fusion with sodium bicarbonate as porogen: sulfur fused with powdered (1) calcium carbonate (CaCO3) (SCa) and (2) oyster shell (SCr). Randomly packed sulfur and limestone granules (S + L) media were used as the control. Results revealed that SCr is the most suitable media as it exhibited the highest nitrate removals and lowest nitrite accumulation. It has macrovoidal pores which facilitated microbial attachment. Additionally, SCr had the highest CaCO3 loading per unit volume and highest media dissolution rate which was favorable to avert pH decrease. But due to high denitrification activity, high sulfate levels in SCr may necessitate a post-treatment step prior to effluent discharge. Due to poor biomass attachment, S + L is most sensitive to change in fluid flow condition. As hydraulic retention time is decreased, S + L exhibited intensive and irreversible performance decline. Inferior denitrification performance of SCa was mainly due to low CaCO3 loading per unit volume, low dissolution kinetics and low alkalinity consumption by denitrifiers. Using modified Stover–Kincannon kinetic model, overall performance and denitrification capacities can be arranged as SCr > S + L > SCa.

► Porous sulfur-oxidizing denitrification media were synthesized via thermal fusion. ► Synthesized media provided sulfur and alkalinity sources. ► Media properties influenced denitrification performances. ► Macrovoidal media structure promoted biomass attachment and substrate supply. ► Porous sulfur/crushed oyster shell was the most effective media for denitrification.

Keywords
Limestone; Denitrification; Nitrate removal; Sulfur oxidation; Packed bed; Oyster shells
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Comparison of reactive porous media for sulfur-oxidizing denitrification of high nitrate strength wastewater
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volumes 58–59, 15 December 2011, Pages 79–86
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us