Impact of alum water treatment residues on the methanogenic activity in the digestion of primary domestic wastewater sludge
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The effect of adding alum water treatment residues (WTR) on the methanogenic activity in
the digestion of primary domestic wastewater sludge was evaluated through laboratory experiments
in sedimentation columns, using total suspended solids (TSS) concentrations from 0.37 to 1.23 g/L.
The addition of WTR to primary clarifiers can benefit its effluent water quality in terms of colour,
turbidity, chemical oxygen demand (COD), and TSS. However, the presence of WTR can negatively
influence the production of methane gas during organic sludge digestion in primary clarifiers,
for concentrations of TSS between 14.43 and 25.23 g/L and of VSS between 10.2 and 11.85 g/L.
The activity of the Methanothrix sp., curved bacilli, methanococci, and Methanosarcina sp. decreases
considerably after 16 days of anaerobic digestion, and methane production seems to only be associated
with fluorescent methanogenic bacilli.
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Alum sludge, Anaerobic bacteria, Methane production, Specific methanogenic activity, Water treatment residues, Methanogenic bacteria
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SCALIZE, Paulo; ALBUQUERQUE, Antonio; BERNARDO, Luiz Di. Impact of alum water treatment residues on the methanogenic activity in the digestion of primary domestic wastewater sludge. Sustainability, Basileia, v. 13, n. 16, e8783, 2021. DOI: 10.3390/su13168783. Disponível em: https://www.mdpi.com/2071-1050/13/16/8783. Acesso em: 29 jan. 2025.