Aerobic Granular Sludge: Perspectives for Excess Sludge Management and Resource Recovery

Dababat, Salahaldeen; Enaime, Ghizlane; Wichern, Marc; Lübken, Manfred

doi:10.1002/cite.202300093

Cited by 1 publication

(1 citation statement)

References 142 publications

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“…Electrochemical technologies such as electrooxidation and electrocoagulation are also used to improve AD efficiency and the quality of the effluent after fermentation [21]. However, the AC-D of AGS with other externally supplied organic substrates is an increasingly common and widespread trend observed in municipal facilities and industrial wastewater treatment plants [22]. This is related to the concept of a utilisation biorefinery, the concept of which fits directly into the currently promoted assumptions of the bioeconomy and circular economy [23].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of Biogas Production in the Co-Digestion of Pre-Hydrodynamically Cavitated Aerobic Granular Sludge with Waste Fats

Dębowski,

Zieliński,

Kazimierowicz

et al. 2024

Energies

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The characteristics of excess aerobic granular sludge, related to its structure and chemical composition, limit the efficiency of anaerobic digestion. For this reason, pre-treatment methods and compositions with other organic substrates are used. In earlier work, no attempt was made to intensify the methane fermentation of the excess aerobic granular sludge by adding fatty waste materials. The aim of the research was to determine the effects of co-digestion of pre-hydrodynamically cavitated aerobic granular sludge with waste fats on the efficiency of methane fermentation under mesophilic and thermophilic conditions. The addition of waste fats improved the C/N ratio and increased its value to 19. Under mesophilic conditions, the highest effects were observed when the proportion of volatile solids from waste fats was 25%. The amount of biogas produced increased by 17.85% and CH4 by 19.85% compared to the control. The greatest effects were observed in thermophilic anaerobic digestion at 55 °C, where a 15% waste fat content in volatile solids was ensured. This resulted in the production of 1278.2 ± 40.2 mL/gVS biogas and 889.4 ± 29.7 mL/gVS CH4. The CH4 content of the biogas was 69.6 ± 1.3%. The increase in biogas and CH4 yield compared to pure aerobic granular sludge anaerobic digestion was 34.4% and 40.1%, respectively. An increase in the proportion of waste fats in the substrate had no significant effect on the efficiency of methane fermentation. Strong positive correlations (R2 > 0.9) were observed between biogas and CH4 production and the C/N ratio and VS concentration.

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Section: Introductionmentioning

confidence: 99%