Estimation of the Unbiodegradable Fraction of Thickened Waste Activated Sludge

Chowdhury, Mohammad Monirul Islam; Nakhla, George; Zhu, Jesse

doi:10.2175/106143017x15131012187962

Cited by 2 publications

(2 citation statements)

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“…The AD process is influenced by a variety of operation parameters including: sludge type, mixing strategy and intensity, pH, temperature, solid retention time (SRT), hydraulic retention time (HRT), and solids concentration (Bergamo et al, 2020;Chowdhury et al, 2018).…”

Section: Anaerobic Digestion Operation Parametersmentioning

confidence: 99%

Co-Digestion of Primary Sludge and Waste Activated Sludge for Methane Production

Mahdi

2024

Preprint

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The ratio of primary sludge (PS) and thickened waste activated sludge (TWAS) is a vital factor in the production of digester gas in the wastewater plants. Many wastewater plants do not track sludge ratio, but instead, use a specific monthly or annual sludge ratio that is calculated as an average for their processed PS and TWAS. Lab scale batch biochemical methane potential (BMP) and semi-continuous experiments were used to study different PS and TWAS ratios in a municipal wastewater treatment plant. The batch BMP study showed that the mixing ratio 67% to 33% (PS:TWAS) was the optimum ratio for the highest digester gas yield of 209 mL CH 4g TCOD. The semi-continuous study showed that the ratio 72% to 28% (PS:TWAS) at 15 days hydraulic retention time was better than the ratio 67% to 33% (PS:TWAS) in producing higher yield (188 mL CH /g4TCOD compared to 163 mL CH /g TCOD4 respectively).

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Section: Anaerobic Digestion Operation Parametersmentioning

confidence: 99%