Investigation of sludge reduction and biogas generation in high-rate anaerobic side-stream reactors for wastewater treatment

Park, Chul; Chon, Dong-Hyun; Brennan, Aaron; Eom, Heonseop

doi:10.1039/c8ew00386f

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…For the continuous production of biogas and the stability of the process, each parameter should be within the prescribed limit. A small fluctuation in a single parameter results in the instability of the entire AD process (Park et al 2018). In the first digester, the methane yield for cow dung, indicated by line A, is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Food and energy are the basic needs of mankind. Due to the rapid increase in the world population and the high dependence on fossil fuels, developing countries have had a significant part in greenhouse gas emissions and environmental pollution (Park et al 2018). Due to the limited resources of oil, gas, coal, and the abrupt fluctuation in their prices, developing countries have serious problems in their energy sectors (Bhoite and Vaidya 2018).…”

Section: Introductionmentioning

confidence: 99%

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Enhancement methane generation by co-digestion of cow dung and grass (Cynodon dactylon) with activated sludge

Ahmad

Maqbool²,

Mehammod-Khan³

et al. 2019

BioRes

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Anaerobic co-digestion (AD) of Cynodon dactylon grass and cow dung was conducted with four different composition levels. To increase lignocellulose digestibility and methane yield, grass was pretreated with NaOH and thermally-modified bentonite was used to inhibit the ammonia production. The highest cumulative methane yield obtained from treatments C (0.40:0.60), D (0.60:0.40), and B (0.20:0.80) was 427 mL/ g.VS, 333 mL/g.VS, and 303 mL/g.VS, respectively, over a digestion period of 40 days at a mesophilic temperature. Treatment C showed an 89.7% increase in the methane yield with respect to the control, followed by treatment D, which recorded a 48% increase, and treatment B at a 34.6% increase. A modified Gompertz model was used to explain the methane generation scenario. The process stability parameters of the anaerobic co-digestion system, such as pH, chemical oxygen demand (COD), electrical conductivity (EC), total solids, total and free ammonia contents, and volatile solids removal were explained in depth in this study.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement methane generation by co-digestion of cow dung and grass (Cynodon dactylon) with activated sludge

Ahmad

Maqbool²,

Mehammod-Khan³

et al. 2019

BioRes

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“…In this respect, very little published information is available about the effect of ASSR installation in a WWTP. In a previous study, the authors observed an increase in the BMP of excess sludge from an ASSR operating with an HRT of 2 days under mesophilic conditions [15]. In that study, the ASSR was inserted in the activated sludge return line of a CAS system consisting of a primary clarifier followed by an aeration basin and a secondary clarifier.…”

Section: Methane Production Yield In Excess Sludge From Osa and Casmentioning

confidence: 97%

“…Another reason why the OSA process could involve an increase of methane productivity is related to the higher bacterial diversity of the ASSR sludge compared with the activated sludge of the control system [36]. Park and co-authors [15] supposed that the sludge from a mesophilic ASSR contained key anaerobic communities, thus the addition of this sludge to anaerobic digesters provided anaerobic seed that enhanced the speed of anaerobic digestion.…”

Section: Methane Production Yield In Excess Sludge From Osa and Casmentioning

confidence: 99%

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Influence of the Oxic-Settling-Anaerobic (OSA) Process on Methane Production by Anaerobic Digestion of Sewage Sludge

Corsino

Trapani

Marines

et al. 2023

Water

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The present study evaluated different sludge-reduction mechanisms in the oxic-settling-anaerobic (OSA) process in terms of their effects on methane productivity by anaerobic digestion of sewage sludge. Two different layouts were investigated for the sludge return from an anaerobic side-stream reactor (ASSR) to the anoxic (scheme A) or the aerobic (scheme B) reactor of a pre-denitrification plant. Biochemical methane-potential (BMP) assays performed on the excess sludge revealed that scheme A promoted an overall increase of methane production in the OSA (20 mLCH4 gVSS−1d−1, +19%), although compared with a control CAS plant a significant decrease in the excess sludge production (31%) was obtained. Operating conditions in scheme A caused the occurrence of cell lysis and EPS hydrolysis, thereby increasing the biodegradability of sludge. In contrast, scheme B favoured the occurrence of uncoupling and a maintenance metabolism that did not involve sludge hydrolysis. Consequently, despite a higher reduction of excess sludge (82%), a significant decrease in methane productivity in the OSA (4 mLCH4 gVSS−1d−1, −41%) was observed. Based on the results, implementing the OSA process may allow high levels of methane production by anaerobic digestion to be maintained if specific sludge-reduction mechanisms are triggered in the waterline, also raising the possibility of co-digestion with other feedstocks.

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Effect of low-thermal pretreatment on the methanogenic performance and microbiome population of continuous high-solid anaerobic digester treating dewatered sludge

Cayetano

Park

et al. 2021

Bioresource Technology

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Investigation of sludge reduction and biogas generation in high-rate anaerobic side-stream reactors for wastewater treatment

Abstract: Activated sludge systems incorporating a 2 day anaerobic side-stream reactor (ASSR) show significantly decreased waste sludge production.

Cited by 7 publications

References 25 publications

Enhancement methane generation by co-digestion of cow dung and grass (Cynodon dactylon) with activated sludge

Enhancement methane generation by co-digestion of cow dung and grass (Cynodon dactylon) with activated sludge

Influence of the Oxic-Settling-Anaerobic (OSA) Process on Methane Production by Anaerobic Digestion of Sewage Sludge

Effect of low-thermal pretreatment on the methanogenic performance and microbiome population of continuous high-solid anaerobic digester treating dewatered sludge

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