Carbohydrate based polymeric materials as slow release electron donors for sulphate removal from wastewater

Carbohydrate based polymeric materials as slow release electron donors for sulphate removal from... Many industrial sulphate rich wastewaters are deficient in electron donors to achieve complete sulphate removal. Therefore, pure and expensive chemicals are supplied externally. In this study, carbohydrate based polymers (CBP) as potato (2 and 5 mm3), filter paper (2 and 5 mm2) and crab shell (2 and 4 mm Ø) were tested as slow release electron donors (SRED) for biological sulphate reduction at 30 °C and initial pH of 7.0. Using the CBP as SRED, sulphate reduction was carried out at different rates: filter paper 0.065–0.050 > potato 0.022–0.034 > crab shell 0.006–0.009 mg SO42−.mg VSS−1d−1. These were also affected by the hydrolysis-fermentation rates: potato 0.087–0.070 > filter paper 0.039–0.047 > crab shell 0.011–0.028 mg CODS.mg VSS−1d−1, respectively. Additionally, the sulphate removal efficiencies using filter paper (cellulose, > 98%), potato (starch, > 82%) and crab shell (chitin, > 32%) were achieved only when using CBP as SRED and in the absence of other easily available electron donors. This study showed that the natural characteristics of the CBP limited the hydrolysis-fermentation step and, therefore, the sulphate reduction rates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Environmental Management Elsevier

Carbohydrate based polymeric materials as slow release electron donors for sulphate removal from wastewater

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0301-4797
D.O.I.
10.1016/j.jenvman.2017.05.074
Publisher site
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Abstract

Many industrial sulphate rich wastewaters are deficient in electron donors to achieve complete sulphate removal. Therefore, pure and expensive chemicals are supplied externally. In this study, carbohydrate based polymers (CBP) as potato (2 and 5 mm3), filter paper (2 and 5 mm2) and crab shell (2 and 4 mm Ø) were tested as slow release electron donors (SRED) for biological sulphate reduction at 30 °C and initial pH of 7.0. Using the CBP as SRED, sulphate reduction was carried out at different rates: filter paper 0.065–0.050 > potato 0.022–0.034 > crab shell 0.006–0.009 mg SO42−.mg VSS−1d−1. These were also affected by the hydrolysis-fermentation rates: potato 0.087–0.070 > filter paper 0.039–0.047 > crab shell 0.011–0.028 mg CODS.mg VSS−1d−1, respectively. Additionally, the sulphate removal efficiencies using filter paper (cellulose, > 98%), potato (starch, > 82%) and crab shell (chitin, > 32%) were achieved only when using CBP as SRED and in the absence of other easily available electron donors. This study showed that the natural characteristics of the CBP limited the hydrolysis-fermentation step and, therefore, the sulphate reduction rates.

Journal

Journal of Environmental ManagementElsevier

Published: Sep 15, 2017

References

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