Evaluating and Refining Alkalinity Calculations Due to Sulfide and Bicarbonate Accessed by Titration in Anaerobic Sulfate-Reducing Bioreactors

Evaluating and Refining Alkalinity Calculations Due to Sulfide and Bicarbonate Accessed by... An anaerobic down-flow fixed-structured bed reactor (DFSBR) treating synthetic acid mine drainage (AMD) presented significant drops in alkalinity (from 2.45 to 1.30 g CaCO3 L−1) simultaneously with sulfide (HS−) precipitation induced by iron addition. To clarify this observation, the theoretical speciation of sulfide in aqueous solution was used to estimate the contribution of HS− for the global alkalinity of the system. Standard solutions of bicarbonate (HCO3 −) and sulfide (HS−) were used to validate the proposed calculations for sulfide and bicarbonate alkalinities. The extent of buffer capacity of sulfide alkalinity under an overload of VFA was also evaluated. An overall assessment of the data obtained from the DFSBR showed that a concentration of total dissolved sulfide (TDS) close to 430 mg L−1 at pH = 8.48 (424 mg HS− L−1) provided an effluent alkalinity of 642 mg CaCO3 L−1 exclusively due to HS−. Therefore, the refined calculations, presented and discussed in this paper, can be considered suitable to differentiate the fractions of alkalinity due to HS− and HCO3 − obtained by titration. This novel approach provides a better characterization of the buffer capacity in anaerobic systems, mainly in order to avoid an overestimation of the HCO3 − produced by the sulfate-reducing bacteria (SRB) metabolism and to predict the potential alkalinity loss by sulfide removal. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water, Air, Soil Pollution Springer Journals

Evaluating and Refining Alkalinity Calculations Due to Sulfide and Bicarbonate Accessed by Titration in Anaerobic Sulfate-Reducing Bioreactors

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Publisher
Springer International Publishing
Copyright
Copyright © 2017 by Springer International Publishing AG
Subject
Environment; Environment, general; Water Quality/Water Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Soil Science & Conservation; Hydrogeology; Climate Change/Climate Change Impacts
ISSN
0049-6979
eISSN
1573-2932
D.O.I.
10.1007/s11270-017-3518-y
Publisher site
See Article on Publisher Site

Abstract

An anaerobic down-flow fixed-structured bed reactor (DFSBR) treating synthetic acid mine drainage (AMD) presented significant drops in alkalinity (from 2.45 to 1.30 g CaCO3 L−1) simultaneously with sulfide (HS−) precipitation induced by iron addition. To clarify this observation, the theoretical speciation of sulfide in aqueous solution was used to estimate the contribution of HS− for the global alkalinity of the system. Standard solutions of bicarbonate (HCO3 −) and sulfide (HS−) were used to validate the proposed calculations for sulfide and bicarbonate alkalinities. The extent of buffer capacity of sulfide alkalinity under an overload of VFA was also evaluated. An overall assessment of the data obtained from the DFSBR showed that a concentration of total dissolved sulfide (TDS) close to 430 mg L−1 at pH = 8.48 (424 mg HS− L−1) provided an effluent alkalinity of 642 mg CaCO3 L−1 exclusively due to HS−. Therefore, the refined calculations, presented and discussed in this paper, can be considered suitable to differentiate the fractions of alkalinity due to HS− and HCO3 − obtained by titration. This novel approach provides a better characterization of the buffer capacity in anaerobic systems, mainly in order to avoid an overestimation of the HCO3 − produced by the sulfate-reducing bacteria (SRB) metabolism and to predict the potential alkalinity loss by sulfide removal.

Journal

Water, Air, Soil PollutionSpringer Journals

Published: Aug 12, 2017

References

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