TY - JOUR
T1 - Tratamiento de aguas residuales con alto contenido de sulfatos empleando un sistema biológico integrado anaerobio/aerobio
AU - Loreto-Muñoz, C. D.
AU - Almendariz-Tapia, F. J.
AU - Martin-Garcia, A. R.
AU - Sierra-Alvarez, R.
AU - Ochoa-Herrera, V.
AU - Monge-Amaya, O.
N1 - Funding Information:
This study was supported by the Department of Chemical Engineering and Metallurgy of the University of Sonora, Universidad San Francisco de Quito, and the National Council of Science and Technology (CONACYT).
Publisher Copyright:
© 2021, Universidad Autonoma Metropolitana. All rights reserved.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - This study evaluated the performance of an integrated anaerobic/aerobic (IAAB) system used for the biological treatment of sulfate-rich wastewater through the reduction of sulfate and the oxidation of sulfide to assess its potential for possible acid mine drainage (AMD) treatment. Separately, an anaerobic sludge was adapted to sulfate-reducing conditions, and an aerobic sludge was activated in a glass column with sucrose as carbon source. Once the sludge activation concluded, the IAAB system, composed of an anaerobic sulfate-reducing reactor (ASRr) and an aerobic sulfide-oxidizing reactor (ASOr), was integrated and operated with a sulfate-rich synthetic solution. The reactor operated with increasing organic (2-4 g COD/L•d) and sulfate (0.4-5.97 g SO2- 4/L•d) loading rates and decreasing COD/SO2- 4 ratios (5-0.67). During the 43 days of adaptation of the ASRr, a COD/SO2- 4 ratio of 1 g/g caused almost a complete displacement of methanogenic activity by sulfate-reducing activity. The removal efficiencies in the IAAB system for COD, sulfate, and produced sulfide were 90%, 60%, and 99%, respectively. By the end of the IAAB system operation, electron flow was mainly directed to sulfidogenic activity, representing 91%. This study demonstrates that a two-step anaerobic/aerobic biological system operating at a high organic loading rate (OLR) can be used for sulfate and organic matter removal from sulfate-rich wastewaters.
AB - This study evaluated the performance of an integrated anaerobic/aerobic (IAAB) system used for the biological treatment of sulfate-rich wastewater through the reduction of sulfate and the oxidation of sulfide to assess its potential for possible acid mine drainage (AMD) treatment. Separately, an anaerobic sludge was adapted to sulfate-reducing conditions, and an aerobic sludge was activated in a glass column with sucrose as carbon source. Once the sludge activation concluded, the IAAB system, composed of an anaerobic sulfate-reducing reactor (ASRr) and an aerobic sulfide-oxidizing reactor (ASOr), was integrated and operated with a sulfate-rich synthetic solution. The reactor operated with increasing organic (2-4 g COD/L•d) and sulfate (0.4-5.97 g SO2- 4/L•d) loading rates and decreasing COD/SO2- 4 ratios (5-0.67). During the 43 days of adaptation of the ASRr, a COD/SO2- 4 ratio of 1 g/g caused almost a complete displacement of methanogenic activity by sulfate-reducing activity. The removal efficiencies in the IAAB system for COD, sulfate, and produced sulfide were 90%, 60%, and 99%, respectively. By the end of the IAAB system operation, electron flow was mainly directed to sulfidogenic activity, representing 91%. This study demonstrates that a two-step anaerobic/aerobic biological system operating at a high organic loading rate (OLR) can be used for sulfate and organic matter removal from sulfate-rich wastewaters.
KW - Integrated bioreactors
KW - Microbial competition
KW - Percentage of electron equivalents
KW - Sulfate-reduction
KW - Sulfide-oxidation
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U2 - 10.24275/rmiq/IA2332
DO - 10.24275/rmiq/IA2332
M3 - Article
AN - SCOPUS:85108520045
SN - 1665-2738
VL - 20
SP - 1005
EP - 1017
JO - Revista Mexicana de Ingeniera Quimica
JF - Revista Mexicana de Ingeniera Quimica
IS - 2
ER -