Sulfate addition as an effective method to improve methane fermentation performance and propionate degradation in thermophilic anaerobic co-digestion of coffee grounds, milk and waste activated sludge with AnMBR

Bioresource Technology
Qian LiKazuyuki Takayanagi

Abstract

This study was conducted to investigate the effects of sulfate on propionate degradation and higher organic loading rate (OLR) achievement in a thermophilic AnMBR for 373days using coffee grounds, milk and waste activated sludge (WAS) as the co-substrate. Without the addition of sulfate, the anaerobic system failed at an OLR of 14.6g-COD/L/d, with propionate accumulating to above 2.23g-COD/L, and recovery by an alkalinity supplement was not successful. After sulfate was added into substrates at a COD/SO4(2-) ratio of 200:1 to 350:1, biogas production increased proportionally with OLR increasing from 4.06 to 15.2g-COD/L/d. Propionic acid was maintained at less than 100mg-COD/L due to the effective conversion of propionic acid to methane after the sulfate supplement was added. The long-term stable performance of the AnMBR indicated that adding sulfate was beneficial for the degradation of propionate and achieving a higher OLR under the thermophilic condition.

References

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Citations

Nov 26, 2015·Bioresource Technology·Federico BattistaGiuseppe Mancini
Sep 28, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Rong ChenYu-You Li
Jun 4, 2018·Environmental Science and Pollution Research International·Marinos StylianouDionysia Fasoula
Oct 18, 2020·Environmental Science and Pollution Research International·Shiqi ZhouZhengbo Yue

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