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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Gouvea de Godoi, Leandro Augusto ; dos Santos Eugenio Foresti, Carla Eloisa Diniz ; Rissato Zamariolli Damianovic, Marcia Helena
Total Authors: 3
Document type: Journal article
Source: WATER AIR AND SOIL POLLUTION; v. 228, n. 9 SEP 2017.
Web of Science Citations: 0
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 VFAwas 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 HSand HCO(3)(-)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 HCO(3)(-)produced by the sulfatereducing bacteria (SRB) metabolism and to predict the potential alkalinity loss by sulfide removal. (AU)

FAPESP's process: 15/06246-7 - Biorefinery concept applied to biological wastewater treatment plants: environmental pollution control coupled with material and energy recovery
Grantee:Marcelo Zaiat
Support Opportunities: Research Projects - Thematic Grants