Impacts of ferric chloride, ferrous chloride and solid retention time on the methane-producing and physicochemical characterization in high-solids sludge anaerobic digestion

2019 ◽  
Vol 139 ◽  
pp. 1290-1298 ◽  
Author(s):  
Yujie Qin ◽  
Linyi Chen ◽  
Tongyu Wang ◽  
Junyi Ren ◽  
Yan Cao ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Ferric Chloride ◽  
Retention Time ◽  
Physicochemical Characterization ◽  
High Solids ◽  
Ferrous Chloride ◽  
Solid Retention Time

scholarly journals Modeling Of Dark Fermentation Process For Volatile Fatty Acids Production

2021 ◽  
Author(s):  
Raman Sharma
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Retention Time ◽  
Alternative Energy ◽  
Fossil Fuels ◽  
Fermentation Process ◽  
Volatile Fatty Acids ◽  
Solid Retention Time ◽  
Steady State Model ◽  
Complex Organic

This study examined the fermentation process for the production of volatile fatty acids from the organic waste. The depletion of fossil fuels motivated researchers to search for alternative energy and fuels instead of relying on the non-renewable way of energy and fuel production. Anaerobic digestion is a biochemical process in the absence of oxygen, where complex organic matter are degraded. The different stages of anaerobic digestion and important operating parameters such as pH, temperature and retention time. The most suitable feedstock and its effects on the treatment process are discussed. This study evaluates the modelling of VFAs production. The paper also demonstrates various model like ADM1, surface limiting model, and steady-state model. Furthermore, an experimental setup consisting of two semi-continuous reactors was employed for the sample analysis. The reactors were fed with raw and pre-treated source separated organics with solid retention time of 3 days. Keywords: Anaerobic digestion, Feedstocks, SSO, VFAs, ADM1

scholarly journals Modeling Of Dark Fermentation Process For Volatile Fatty Acids Production

2021 ◽  
Author(s):  
Raman Sharma
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Retention Time ◽  
Alternative Energy ◽  
Fossil Fuels ◽  
Fermentation Process ◽  
Volatile Fatty Acids ◽  
Solid Retention Time ◽  
Steady State Model ◽  
Complex Organic

This study examined the fermentation process for the production of volatile fatty acids from the organic waste. The depletion of fossil fuels motivated researchers to search for alternative energy and fuels instead of relying on the non-renewable way of energy and fuel production. Anaerobic digestion is a biochemical process in the absence of oxygen, where complex organic matter are degraded. The different stages of anaerobic digestion and important operating parameters such as pH, temperature and retention time. The most suitable feedstock and its effects on the treatment process are discussed. This study evaluates the modelling of VFAs production. The paper also demonstrates various model like ADM1, surface limiting model, and steady-state model. Furthermore, an experimental setup consisting of two semi-continuous reactors was employed for the sample analysis. The reactors were fed with raw and pre-treated source separated organics with solid retention time of 3 days. Keywords: Anaerobic digestion, Feedstocks, SSO, VFAs, ADM1

Production of High Calorific Biogas from Organic Wastewater and Enhancement of Anaerobic Digestion

2012 ◽  
Vol 550-553 ◽  
pp. 522-528 ◽  
Author(s):  
Yan Qiu Nie ◽  
Yu Xiu Li ◽  
Hui He ◽  
Wen Jing Zhou ◽  
Zhao Hui Pang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Retention Time ◽  
Biogas Production ◽  
Calorific Value ◽  
Optimal Dose ◽  
Organic Loading Rate ◽  
Solid Retention Time ◽  
Step Process ◽  
Biogas Purification ◽  
Organic Wastewater

Anaerobic digestion is a widely applied technology to produce biogas from organic wastewater. The biogas calorific value depends on the methane-content. For biogas flows >100 m3/h, the two-step process is usually used for production of high calorific biogas from organic wastewater: the first step, anaerobic digestion; the second step, biogas purification. However, for biogas flows 3/h, biogas purification is not economical, and one-step process according to the big gap between methane and non-methane-gas in solubility at higher pressure or lower temperature, should be condidered. New anaerobic digestion processes, such as micro-aerobic process, electrolysis enhancing methane production process, process of internal circulation anaerobic digester (ICAD) with sewage source heat pump, may all enhance biogas producton or lower biogas production cost. In addition, suitable environmental conditions, such as organic loading rate (OLR), solid retention time (SRT), hydraulic retention time (HRT) and surface area, are all beneficial to enhance methane fermentation. Furthermore, new operation modes and optimal dose of trace metals might be selected.

Deep Shaft High Rate Aerobic Digestion: Laboratory and Pilot Plant Performance

1981 ◽  
Vol 16 (1) ◽  
pp. 71-90 ◽  
Author(s):  
F. Tran ◽  
D. Gannon
Keyword(s):  
Retention Time ◽  
Oxygen Transfer ◽  
Pilot Plant ◽  
High Rate ◽  
Plant Performance ◽  
High Solids ◽  
Aerobic Digestion ◽  
Volatile Solids ◽  
Solids Content ◽  
High Solids Content

Abstract The Deep Shaft process, originating from ICI Ltd. in the U.K., has been further developed by C-I-L Inc., Eco-Technology Division into an extremely energy efficient, high rate biological treatment process for industrial and municipal wastewaters. The Deep Shaft is essentially an air-lift reactor, sunk deep in the ground (100 - 160 m): the resulting high hydrostatic pressure together with very efficient mixing in the shaft provide extremely high oxygen transfer efficiencies (O.T.E.) of up to 90% vs 4 to 20% in other aerators. This high O.T.E. suggests real potential for Deep Shaft technology in the aerobic digestion of sludges and animal wastes: with conventional aerobic digesters an O.T.E. over 8% is extremely difficult to achieve. This paper describes laboratory and pilot plant Deep Shaft aerobic digester (DSAD) studies carried out at Eco-Research's Pointe Claire, Quebec laboratories, and at the Paris, Ontario pilot Deep Shaft digester. An economic pre-evaluation indicated that DSAD had the greatest potential for treating high solids content primary or secondary sludge (3-7% total solids) in the high mesophilic and thermophilic temperature range (25-60°C) i.e. in cases where conventional digesters would experience severe limitations of oxygen transfer. Laboratory and pilot plant studies have accordingly concentrated on high solids content sludge digestion as a function of temperature. Laboratory scale daily draw and fill DSAD runs with a 5% solids sludge at 33°C with a 3 day retention time have achieved 34% volatile solids reduction and a stabilized sludge exhibiting a specific oxygen uptake rate (S.O.U.R.) of less than 1 mgO2/gVSS/hour, measured at 20°C. This digestion rate is about four times faster than the best conventional digesters. Using Eco-Research's Paris, Ontario pilot scale DSAD (a 160 m deep 8 cm diameter u-tube), a 40% reduction in total volatile solids, (or 73% reduction of biodegradable VS) and a final SOUR of 1.2 mg02/gVSS/hour have been achieved for a 4.6% solids sludge in 4 days at 33°C, with loading rates of up to 7.9 kg VSS/m3-day. Laboratory runs at thermophilic temperatures (up to 60°C) have demonstrated that a stabilized sludge (24-41% VSS reduction) can be produced in retention time of 2 days or less, with a resulting loading rate exceeding 10 kg VSS/m3-day.

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