Paradigm Shift in Domestic Wastewater Treatment: Toward Energy Minimization, Greenhouse Gas Emission Reduction, and Resources Recovery

Alpaslan Kocamemi, Bilge; Çelik, Sümeyye; Senol, Abdullah Bugra; Kurt, Halil; Erken, Esra

doi:10.1007/978-3-031-36298-9_15

Cited by 1 publication

(2 citation statements)

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“…As illustrated in Figure 9, all treated samples exhibited enhanced biodegradability compared to the untreated TWAS. This enhancement can be attributed to the presence of readily biodegradable compounds within the treated substrates (either pretreated and/or fermented), which were introduced into the anaerobic digesters [40][41][42]. The observed higher methane yields in all treated samples, regardless of the specific treatment approach, align with findings from other relevant references [29].…”

Section: Anaerobic Biodegradabilitysupporting

confidence: 54%

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Enhancing Single- and Two-Stage Anaerobic Digestion of Thickened Waste-Activated Sludge through FNA-Heat Pretreatment

Chegini,

Elbeshbishy

2024

Processes

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This study aimed to investigate the effect of combined Free Nitrous Acid (FNA)-Heat (i.e., FNH) pretreatment on single- and two-stage anaerobic digestion (AD) of thickened waste-activated sludge (TWAS). Single-stage AD was conducted in batches, while two-stage AD involved acidogenic fermentation under semi-continuous flow followed by batch methanogenesis. FNH pretreatment was applied before the acidogenic stage, using 1.4 mg HNO2-N/L FNA concentration at 25 °C, 37 °C, and 60 °C for 24 h. Among the scenarios, the most promising results were observed with two-stage AD fed with FNH-pretreated TWAS at 60 °C, showing higher COD solubilization and a reduction in volatile solids. Combined FNA-Heat pretreatment in two-stage AD yielded elevated methane production (363–415 mL CH4/g VS added) compared to single-stage digestion. Methane yields from FNA-Heat pretreated single-stage ranged from 332 to 347 mL CH4/g VS added, contrasting with 212 mL CH4/g VS added for untreated TWAS. Methane generation commenced early in both untreated and pretreated samples, attributed to soluble substrate abundance.

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Section: Anaerobic Biodegradabilitysupporting

confidence: 54%

Section: Kinetic Analysismentioning

confidence: 99%