TY - JOUR
T1 - Anaerobic digestion of wastewater rich in sulfate and sulfide
T2 - effects of metallic waste addition and micro-aeration on process performance and methane production
AU - Montalvo, Silvio
AU - Huiliñir, César
AU - Borja, Rafael
AU - Castillo, Alejandra
AU - Pereda, Ileana
N1 - Publisher Copyright:
© 2019, © 2019 Taylor & Francis Group, LLC.
PY - 2019
Y1 - 2019
N2 - This work explores the effect of two metallic wastes (mining wastes, MW; fly ashes, FA) and micro-aeration (MA) on the anaerobic digestion of wastewater which is rich in sulfate and sulfide. Two initial COD concentrations (5,000 and 10,000 mg/L) were studied under both conditions in batch systems at 35 °C, with a fixed COD/SO4 2− ratio = 10, with 100 mg/L of S2−. It was observed that the use of MW and FA in the assays with an initial COD concentration of 10,000 mg/L resulted in a simultaneous increase in COD removal, sulfate removal, sulfide removal and methane generation, while MA only improved the COD and sulfide removals in comparison with the control system. On the contrary, the use of MW, FA or MA in systems with initial COD concentrations equal to or lower than 5,000 mg/L did not show any improvement with respect to the control system in terms of COD removal, sulfate removal or methane generation, with only sulfide removal being positively affected by MW and FA.
AB - This work explores the effect of two metallic wastes (mining wastes, MW; fly ashes, FA) and micro-aeration (MA) on the anaerobic digestion of wastewater which is rich in sulfate and sulfide. Two initial COD concentrations (5,000 and 10,000 mg/L) were studied under both conditions in batch systems at 35 °C, with a fixed COD/SO4 2− ratio = 10, with 100 mg/L of S2−. It was observed that the use of MW and FA in the assays with an initial COD concentration of 10,000 mg/L resulted in a simultaneous increase in COD removal, sulfate removal, sulfide removal and methane generation, while MA only improved the COD and sulfide removals in comparison with the control system. On the contrary, the use of MW, FA or MA in systems with initial COD concentrations equal to or lower than 5,000 mg/L did not show any improvement with respect to the control system in terms of COD removal, sulfate removal or methane generation, with only sulfide removal being positively affected by MW and FA.
KW - Anaerobic digestion
KW - fly ashes
KW - micro-aeration
KW - mining wastes
KW - sulfide removal
UR - http://www.scopus.com/inward/record.url?scp=85067440522&partnerID=8YFLogxK
U2 - 10.1080/10934529.2019.1623597
DO - 10.1080/10934529.2019.1623597
M3 - Article
C2 - 31188049
AN - SCOPUS:85067440522
SN - 1093-4529
VL - 54
SP - 1035
EP - 1043
JO - Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
JF - Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
IS - 10
ER -