Effect of micro-aerobic process on improvement of anaerobic digestion sewage sludge treatment: flow cytometry and ATP assessment

Abstract

Micro-aeration as a pretreatment method improves the efficiency of anaerobic digestion of municipal sewage sludge and consequently promotes the methane production.

The influence of combined low-strength ultrasonics and micro-aerobic pretreatment process on methane generation and sludge digestion: Lipase enzyme, microbial activation, and energy yield

“…A decrease in ATP over a period of 20 to 40 h and a subsequent increase in the number of living microorganisms over a period of 40 h confirms this theory. It seems that the increase in microbial activity up to 20 h and the subsequent decrease up to 40 h is due to the consumption of biodegradable organic compounds [23] , [63] .…”

“…The effect of air flow rate (AFR) (0.1, 0.2, 0.3, 0.5 air volume perliquid volume per minute (VVM)) and time 0, 20, 30, 40, 48 and 60 h, at a temperature of 38° C on sludge solubilization and lipase activity based on the method previously described in [23] .…”

“…Thus, the combination of pre-treatment methods can lead to improve sludge treatment efficiency in terms of energy consumption and economic efficiency [21] . For instance, thermal chemistry, ultrasonic enzymatic and mechanical alkaline techniques improve the decomposition and solubilization of sludge before the anaerobic digestion process [22] , [23] . Kim et al (2010) reported that the combined ultrasonic and alkaline pre-treatment improve the sludge decomposition by 16.6% [24] .…”

Efficient Treatment and Simultaneous Energy Recovery from Cattle Wastewater by the Micro-Aerated UASB and SBR Coupled System

“…However, there are some obstacles that hinder the widespread use of the hybrid UASB and SBR system, such as a long start-up period, low stability, and disintegration. , In order to effectively capture a majority of the organic matter within a short retention time in the UASB, micro-aeration is employed, which accelerates the hydrolysis of organics (the rate-limiting step of the anaerobic process). , Proper micro-aeration in the UASB system does not hinder the formation of anaerobic granular sludge (AnGS) . On the other hand, the SBR system presents high potential for nitrogen and phosphorus removal.…”

Microbiome Characterization after Aerobic Digestate Reactivation of Anaerobically Digested Sewage Sludge

“…Another recent study showed that aeration of sewage sludge within anaerobic digesters can improve the anaerobic digestion process as well. They used 0.02 vvm (air volume per liquid volume per minute) and an aeration time of 40 h, which increased methane production by 221% [15].…”