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Hailu AM, Asfaw SL, Tegaye TA. Effect of carbon-rich-waste addition as co-substrate on the performance and stability of anaerobic digestion of abattoir wastewater without agitation. BIORESOUR BIOPROCESS 2020. [DOI: 10.1186/s40643-020-00333-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
AbstractMultiple wastes’ co-digestion is one of the alternatives for improved anaerobic digestion (AD) process of industrial and municipal wastes. The present work investigated the influence of fruit–vegetable solid waste (FVW) addition as a co-substrate on the performance of AD of abattoir wastewater (AWW). The co-digestion was done at a lab-scale-based experiment under mesophilic condition using a two-phase anaerobic sequencing batch reactor without agitation. It was tested at different mixing ratios (100%AWW; 75%AWW:25%FVW; 50%AWW:50%FVW; 25%AWW:75%FVW; 100%FVW) with the intention of looking for the best mixing ratio with the best performance. It was fed on a semi-continuous basis and operated for 18 days (d) total retention time (HRT): 3 days for the acidogenesis reactor and 15 days for methanogenesis reactor. The addition of FVW enhanced biogas yield and VS removal by 70.26% and 57.11%, respectively, at optimum mixing ratio. Moreover, to some extent improvement of AD process stability verified by the decreased TVFA:TAlk ratio and free ammonia nitrogen was observed upon progressive addition of FVW. Finally, this co-digestion process should further be studied for its performance at different HRTs with agitation.
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2
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Khan N, Khan MD, Sabir S, Nizami AS, Anwer AH, Rehan M, ZainKhan M. Deciphering the effects of temperature on bio-methane generation through anaerobic digestion. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:29766-29777. [PMID: 31873899 DOI: 10.1007/s11356-019-07245-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 12/02/2019] [Indexed: 06/10/2023]
Abstract
Anaerobic digestion (AD) is a sustainable wastewater treatment technology which facilitates energy, nutrient, and water recovery from organic wastes. The agricultural and industrial wastes are suitable substrates for the AD, as they contain a high level of biodegradable compounds. The aim of this study was to examine the AD of three different concentrations of phenol (100, 200, and 300 mg/L) containing wastewater with and without co-substrate (acetate) at four different temperatures (25, 35, 45, and 55 °C) to produce methane (CH4)-enriched biogas. It was observed that the chemical oxygen demand (COD) and phenol removal efficiencies of up to 76% and 72%, respectively, were achieved. The CH4 generation was found higher in anaerobic batch reactors (ABRs) using acetate as co-substrate, with the highest yield of 189.1 μL CH4 from 500 μL sample injected, obtained using 200 mg/L of phenol at 35 °C. The results revealed that the performance of ABR in terms of degradation efficiency, COD removal, and biogas generation was highest at 35 °C followed by 55, 45, and 25 °C indicating 35 °C to be the optimum temperature for AD of phenolic wastewater with maximum energy recovery. Scanning electron microscopy (SEM) revealed that the morphology of the anaerobic sludge depends greatly on the temperature at which the system is maintained which in turn affects the performance and degradation of toxic contaminants like phenol. It was observed that the anaerobic sludge maintained at 35 °C showed uniform channels leading to higher permeability through enhanced mass transfer to achieve higher degradation rates. However, the denser sludge as in the case of 55 °C showed lesser permeability leading to limited transfer and thus reduced treatment. Quantitative real-time PCR (qPCR) analysis revealed a more noteworthy change in the population of the microbial communities due to temperature than the presence of phenol with the methanogens being the dominating species at 35 °C. The findings suggest that the planned operation of the ABR could be a promising choice for CH4-enriched biogas and COD removal from phenolic wastewater.
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Affiliation(s)
- Nishat Khan
- Department of Chemistry, Environmental Research Laboratory, Aligarh Muslim University, Aligarh, Uttar Pradesh, 202002, India
| | - Mohammad Danish Khan
- Department of Chemistry, Environmental Research Laboratory, Aligarh Muslim University, Aligarh, Uttar Pradesh, 202002, India
| | - Suhail Sabir
- Department of Chemistry, Environmental Research Laboratory, Aligarh Muslim University, Aligarh, Uttar Pradesh, 202002, India
| | - Abdul-Sattar Nizami
- Sustainable Development Study Centre, Government College University, Lahore, Pakistan.
| | - Abdul Hakeem Anwer
- Department of Chemistry, Environmental Research Laboratory, Aligarh Muslim University, Aligarh, Uttar Pradesh, 202002, India
| | - Mohammad Rehan
- Center of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohammad ZainKhan
- Department of Chemistry, Environmental Research Laboratory, Aligarh Muslim University, Aligarh, Uttar Pradesh, 202002, India.
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Farhat A, Manai I, Gtari M, Bouallagui H. Effect of enhancing nutrient balance in anaerobic digester feedstock by co-substrate addition on the microbial diversity and energy production from municipal sewage sludge. J Biosci Bioeng 2018; 126:497-506. [DOI: 10.1016/j.jbiosc.2018.04.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 03/29/2018] [Accepted: 04/22/2018] [Indexed: 11/28/2022]
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4
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Kouas M, Torrijos M, Schmitz S, Sousbie P, Sayadi S, Harmand J. Co-digestion of solid waste: Towards a simple model to predict methane production. BIORESOURCE TECHNOLOGY 2018; 254:40-49. [PMID: 29413937 DOI: 10.1016/j.biortech.2018.01.055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Revised: 01/08/2018] [Accepted: 01/10/2018] [Indexed: 06/08/2023]
Abstract
Modeling methane production is a key issue for solid waste co-digestion. Here, the effect of a step-wise increase in the organic loading rate (OLR) on reactor performance was investigated, and four new models were evaluated to predict methane yields using data acquired in batch mode. Four co-digestion experiments of mixtures of 2 solid substrates were conducted in semi-continuous mode. Experimental methane yields were always higher than the BMP values of mixtures calculated from the BMP of each substrate, highlighting the importance of endogenous production (methane produced from auto-degradation of microbial community and generated solids). The experimental methane productions under increasing OLRs corresponded well to the modeled data using the model with constant endogenous production and kinetics identified at 80% from total batch time. This model provides a simple and useful tool for technical design consultancies and plant operators to optimize the co-digestion and the choice of the OLRs.
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Affiliation(s)
- Mokhles Kouas
- LBE, INRA, Univ Montpellier, 102 avenue des Etangs, 11100 Narbonne, France; Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, University of Sfax, Sidi Mansour Road km 6, PO Box «1177», 3018 Sfax, Tunisia
| | - Michel Torrijos
- LBE, INRA, Univ Montpellier, 102 avenue des Etangs, 11100 Narbonne, France.
| | - Sabine Schmitz
- LBE, INRA, Univ Montpellier, 102 avenue des Etangs, 11100 Narbonne, France
| | - Philippe Sousbie
- LBE, INRA, Univ Montpellier, 102 avenue des Etangs, 11100 Narbonne, France
| | - Sami Sayadi
- Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, University of Sfax, Sidi Mansour Road km 6, PO Box «1177», 3018 Sfax, Tunisia
| | - Jérôme Harmand
- LBE, INRA, Univ Montpellier, 102 avenue des Etangs, 11100 Narbonne, France
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Pearse LF, Hettiaratchi JP, Kumar S. Towards developing a representative biochemical methane potential (BMP) assay for landfilled municipal solid waste - A review. BIORESOURCE TECHNOLOGY 2018; 254:312-324. [PMID: 29395741 DOI: 10.1016/j.biortech.2018.01.069] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 01/10/2018] [Accepted: 01/15/2018] [Indexed: 06/07/2023]
Abstract
The applicability of slurry-based (semi-liquids) BMP assay in determining biodegradation kinetic parameters of landfilled waste is critically reviewed. Factors affecting the amount and rate of methane (CH4) production during anaerobic degradation of municipal solid waste (MSW) and optimal values of these factors specific to landfill conditions are presented. The history of conventional BMP, and some existing procedures are reviewed. A landfill BMP (LBMP) assay is proposed that manipulates some of the key factors, such as moisture content, particle and sample size, that affects the rate of CH4 production and the CH4 generation potential of landfilled MSW (LMSW). By selecting proper conditions for these factors, a representative BMP assay could be conducted to ensure accurate determinations of CH4 potential and the kinetic parameters k; first order rate coefficient and Lo; methane generation potential.
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Affiliation(s)
- Lauretta Feyisetan Pearse
- Center for Environmental Engineering Research and Education (CEERE), Department of Civil Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada
| | - Joseph Patrick Hettiaratchi
- Center for Environmental Engineering Research and Education (CEERE), Department of Civil Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada
| | - Sunil Kumar
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Mrag, Nagpur 440 020, India.
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Effect of Seasonal Temperature on the Performance and on the Microbial Community of a Novel AWFR for Decentralized Domestic Wastewater Pretreatment. APPLIED SCIENCES-BASEL 2017. [DOI: 10.3390/app7060605] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Due to environmental burden and human health risks in developing countries, the treatment of decentralized domestic wastewater has been a matter of great concern in recent years. A novel pilot-scale three-stage anaerobic wool-felt filter reactor (AWFR) was designed to treat real decentralized domestic wastewater at seasonal temperature variations of 8 to 35 °C for 364 days. The results showed that the average chemical oxygen demand (COD) removal efficiencies of AWFR in summer and winter were 76 ± 7.2% and 52 ± 5.9% at one day and three days Hydraulic Retention Time (HRT), respectively. COD mass balance analysis demonstrated that even though COD removal was lower in winter, approximately 43.5% of influent COD was still converted to methane. High-throughput MiSeq sequencing analyses indicated that Methanosaeta, Methanobacterium, and Methanolinea were the predominant methanogens, whereas the genus Bacillus probably played important roles in fermentation processes throughout the whole operation period. The performance and microbial community composition study suggested the application potential of the AWFR system for the pretreatment of decentralized domestic wastewater.
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Kim K, Islam R, Benson A, Joe MM, Denver W, Chanratan M, Chatterjee P, Kang Y, Sa T. An Overview of Different Techniques on the Microbial Community Structure, and Functional Diversity of Plant Growth Promoting Bacteria. ACTA ACUST UNITED AC 2016. [DOI: 10.7745/kjssf.2016.49.2.144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Li Y, Tabassum S, Yu Z, Wu X, Zhang X, Song Y, Chu C, Zhang Z. Effect of effluent recirculation rate on the performance of anaerobic bio-filter treating coal gasification wastewater under co-digestion conditions. RSC Adv 2016. [DOI: 10.1039/c6ra18363h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this study, anaerobic biofilter (AF) was adopted for anaerobic co-digestion of potato starch wastewater (PSW) and coal gasification wastewater (CGW).
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Affiliation(s)
- Yajie Li
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Salma Tabassum
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
- LCM – Laboratory of Catalysis and Materials – Associate Laboratory LSRE-LCM
| | - Zhenjiang Yu
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Xiaogang Wu
- State Key Laboratory of Microbial Metabolism
- School of Life Sciences & Biotechnology
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Xiaojun Zhang
- State Key Laboratory of Microbial Metabolism
- School of Life Sciences & Biotechnology
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Yaping Song
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Chunfeng Chu
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Zhenjia Zhang
- School of Environmental Science and Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- China
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9
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Alagöz BA, Yenigün O, Erdinçler A. Enhancement of anaerobic digestion efficiency of wastewater sludge and olive waste: Synergistic effect of co-digestion and ultrasonic/microwave sludge pre-treatment. WASTE MANAGEMENT (NEW YORK, N.Y.) 2015; 46:182-8. [PMID: 26320815 DOI: 10.1016/j.wasman.2015.08.020] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 08/10/2015] [Accepted: 08/15/2015] [Indexed: 05/05/2023]
Abstract
This study investigates the effect of ultrasonic and microwave pre-treatment on biogas production from the anaerobic co-digestion of olive pomace and wastewater sludges. It was found that co-digestion of wastewater sludge with olive pomace yielded around 0.21 L CH4/g VS added, whereas the maximum methane yields from the mono-digestion of olive pomace and un-pretreated wastewater sludges were 0.18 and 0.16L CH4/g VS added. In the same way, compared to mono-digestion of these substrates, co-digestion increased methane production by 17-31%. The microwave and ultrasonic pre-treatments applied to sludge samples prior to co-digestion process led to further increase in the methane production by 52% and 24%, respectively, compared to co-digestion with un-pretreated wastewater sludge. The highest biogas and methane yields were obtained from the co-digestion of 30 min microwave pre-treated wastewater sludges and olive pomace to be 0.46 L/g VS added and 0.32 L CH4/g VS added, respectively.
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Affiliation(s)
- B Aylin Alagöz
- Bogazici University, Institute of Environmental Sciences, 34342, Bebek, Istanbul, Turkey.
| | - Orhan Yenigün
- Bogazici University, Institute of Environmental Sciences, 34342, Bebek, Istanbul, Turkey
| | - Ayşen Erdinçler
- Bogazici University, Institute of Environmental Sciences, 34342, Bebek, Istanbul, Turkey
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Characterization of microbial compositions in a thermophilic chemostat of mixed culture fermentation. Appl Microbiol Biotechnol 2015; 100:1511-1521. [PMID: 26563549 DOI: 10.1007/s00253-015-7130-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 10/26/2015] [Accepted: 10/29/2015] [Indexed: 10/22/2022]
Abstract
The microbial community compositions of a chemostat enriched in a thermophilic (55 °C) mixed culture fermentation (MCF) for hydrogen production under different operational conditions were revealed in this work by integrating denaturing gradient gel electrophoresis (DGGE), Illumina Miseq high-throughput sequencing, and 16S rRNA clone library sequencing. The results showed that the community structure of the enriched cultures was relatively simple. Clones close to the genera of Thermoanaerobacter and/or Bacillus mainly dominated the bacteria. And homoacetogens and archaea were washed out and not detected even by Illumina Miseq high-throughput sequencing which supported the benefit for hydrogen production. On the other hand, the results revealed that the metabolic shift was clearly associated with the change of dominated bacterial groups. The effects of hydrogen partial pressure (PH2) and pH from 4.0 to 5.5 on the microbial compositions were not notable and Thermoanaerobacter was dominant, thus, the metabolites were also not changed. While Bacillus, Thermoanaerobacter and Propionispora hippei dominated the bacteria communities at neutral pH, or Bacillus and Thermoanaerobacter dominated at high influent glucose concentrations, consequently the main metabolites shifted to acetate, ethanol, propionate, or lactate. Thereby, the effect of microbial composition on the metabolite distribution and shift shall be considered when modeling thermophilic MCF in the future.
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11
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12
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Quiroga G, Castrillón L, Fernández-Nava Y, Marañón E, Negral L, Rodríguez-Iglesias J, Ormaechea P. Effect of ultrasound pre-treatment in the anaerobic co-digestion of cattle manure with food waste and sludge. BIORESOURCE TECHNOLOGY 2014; 154:74-79. [PMID: 24384312 DOI: 10.1016/j.biortech.2013.11.096] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Revised: 11/27/2013] [Accepted: 11/30/2013] [Indexed: 06/03/2023]
Abstract
This paper presents a study of the effect of applying ultrasound pre-treatment in the production of methane when co-digesting mixtures of cattle manure with food waste and sludge. A series of experiments were carried out under mesophilic and thermophilic conditions in continuously stirred-tank reactors containing 70% cattle manure, 20% food waste and 10% sewage sludge. Ultrasound pre-treatment allows operating at lower HRT, achieving higher volumetric methane yields: 0.85 L CH4/L day at 36°C and 0.82 CH4/L day at 55°C, when cattle manure and sewage sludge were sonicated. With respect to the non-sonicated waste, these values represent increases of up to 31% and 67% for mesophilic and thermophilic digestion, respectively.
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Affiliation(s)
- G Quiroga
- Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain
| | - L Castrillón
- Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain
| | - Y Fernández-Nava
- Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain
| | - E Marañón
- Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain.
| | - L Negral
- Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain
| | - J Rodríguez-Iglesias
- Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain
| | - P Ormaechea
- Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain
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13
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Ganesh R, Torrijos M, Sousbie P, Steyer JP, Lugardon A, Delgenes JP. Anaerobic co-digestion of solid waste: Effect of increasing organic loading rates and characterization of the solubilised organic matter. BIORESOURCE TECHNOLOGY 2013; 130:559-569. [PMID: 23334011 DOI: 10.1016/j.biortech.2012.12.119] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 12/14/2012] [Accepted: 12/15/2012] [Indexed: 06/01/2023]
Abstract
The impact of stepwise increase in OLR (up to 7.5kgVS/m(3)d) on methane production, reactor performance and solubilised organic matter production in a high-loading reactor were investigated. A reference reactor operated at low OLR (<2.0kgVS/m(3)d) was used solely to observe the methane potential of the feed substrate. Specific methane yield was 0.33lCH(4)/gVS at the lowest OLR and dropped by about 20% at the maximum OLR, while volumetric methane production increased from 0.35 to 1.38m(3)CH(4)/m(3)d. At higher loadings, solids hydrolysis was affected, with consequent transfer of poorly-degraded organic material into the drain solids. Biodegradability and size-fractionation of the solubilised COD were characterized to evaluate the possibility of a second stage liquid reactor. Only 18% of the organics were truly soluble (<1kD). The rest were in colloidal and very fine particulate form which originated from grass and cow manure and were non-biodegradable.
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Affiliation(s)
- Rangaraj Ganesh
- INRA, UR50, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne F-11100, France.
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Marañón E, Castrillón L, Quiroga G, Fernández-Nava Y, Gómez L, García MM. Co-digestion of cattle manure with food waste and sludge to increase biogas production. WASTE MANAGEMENT (NEW YORK, N.Y.) 2012; 32:1821-1825. [PMID: 22743289 DOI: 10.1016/j.wasman.2012.05.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 05/02/2012] [Accepted: 05/22/2012] [Indexed: 06/01/2023]
Abstract
Anaerobic co-digestion strategies are needed to enhance biogas production, especially when treating certain residues such as cattle/pig manure. This paper presents a study of co-digestion of cattle manure with food waste and sewage sludge. With the aim of maximising biogas yields, a series of experiments were carried out under mesophilic and thermophilic conditions using continuously stirred-tank reactors, operating at different hydraulic residence times. Pretreatment with ultrasound was also applied to compare the results with those obtained with non-pretreated waste. Specific methane production decreases when increasing the OLR and decreasing HRT. The maximum value obtained was 603 LCH(4)/kg VS(feed) for the co-digestion of a mixture of 70% manure, 20% food waste and 10% sewage sludge (total solid concentration around 4%) at 36°C, for an OLR of 1.2g VS/L day. Increasing the OLR to 1.5g VS/L day led to a decrease of around 20-28% in SMP. Lower methane yields were obtained when operating at 55°C. The increase in methane production when applying ultrasound to the feed mixtures does not compensate for the energy spent in this pretreatment.
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Affiliation(s)
- E Marañón
- Department of Chemical Engineering and Environmental Technology, University Institute of Technology of Asturias, Campus of Gijon, University of Oviedo, 33203 Gijón, Spain.
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15
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Kumar AG, Kirubagaran R, Nagesh N, Parrado Rubio J, Sekaran G. Influence of fermentation metabolites on redox potential in anaerobic digestion of proteinaceous solid wastes by Synergistes sp. Eng Life Sci 2010. [DOI: 10.1002/elsc.200900057] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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16
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Aouidi F, Khelifi E, Asses N, Ayed L, Hamdi M. Use of cheese whey to enhance Geotrichum candidum biomass production in olive mill wastewater. J Ind Microbiol Biotechnol 2010; 37:877-82. [DOI: 10.1007/s10295-010-0752-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Accepted: 05/20/2010] [Indexed: 11/29/2022]
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17
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Suryawanshi PC, Chaudhari AB, Kothari RM. Mesophilic anaerobic digestion: first option for waste treatment in tropical regions. Crit Rev Biotechnol 2010; 30:259-82. [DOI: 10.3109/07388551.2010.487047] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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18
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Gannoun H, Bouallagui H, Okbi A, Sayadi S, Hamdi M. Mesophilic and thermophilic anaerobic digestion of biologically pretreated abattoir wastewaters in an upflow anaerobic filter. JOURNAL OF HAZARDOUS MATERIALS 2009; 170:263-271. [PMID: 19501962 DOI: 10.1016/j.jhazmat.2009.04.111] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2008] [Revised: 04/28/2009] [Accepted: 04/28/2009] [Indexed: 05/27/2023]
Abstract
The hydrolysis pretreatment of abattoir wastewaters (AW), rich in organic suspended solids (fats and protein) was studied in static and stirred batch reactors without aeration in the presence of natural microbial population acclimated in a storage tank of AW. Microbial analysis showed that the major populations which contribute to the pretreatment of AW belong to the genera Bacillus. Contrary to the static pretreatment, the stirred conditions favoured the hydrolysis and solubilization of 80% of suspended matter into soluble pollution. The pretreated AW, in continuous stirred tank reactor (CSTR) at a hydraulic retention time (HRT) of 2 days, was fed to an upflow anaerobic filter (UAF) at an HRT of 2 days. The performance of anaerobic digestion of biologically pretreated AW was examined under mesophilic (37 degrees C) and thermophilic (55 degrees C) conditions. The shifting from a mesophilic to a thermophilic environment in the UAF was carried out with a short start-up of thermophilic condition. The UAF ran at organic loading rates (OLRs) ranging from 0.9 to 6g COD/Ld in mesophilic conditions and at OLRs from 0.9 to 9 g COD/Ld in thermophilic conditions. COD removal efficiencies of 80-90% were achieved for OLRs up to 4.5 g COD/Ld in mesophilic conditions, while the highest OLRs i.e. 9 g COD/Ld led to efficiencies of 70-72% in thermophilic conditions. The biogas yield in thermophilic conditions was about 0.32-0.45 L biogas/g of COD removed for OLRs up to 4.5 g COD/Ld. For similar OLR, the UAF in mesophilic conditions showed lower percentage of methanization. Mesophilic anaerobic digestion has been shown to destroy pathogens partially, whereas the thermophilic process was more efficient in the removal of indicator microorganisms and pathogenic bacteria at different organic loading rates.
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Affiliation(s)
- H Gannoun
- Department of Biological and Chemical Engineering, Laboratory of Microbial Ecology and Technology, National Institute of Applied Sciences and Technology, 1080 Tunis, Tunisia
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Bouallagui H, Lahdheb H, Ben Romdan E, Rachdi B, Hamdi M. Improvement of fruit and vegetable waste anaerobic digestion performance and stability with co-substrates addition. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2009; 90:1844-1849. [PMID: 19117663 DOI: 10.1016/j.jenvman.2008.12.002] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2008] [Revised: 08/29/2008] [Accepted: 12/01/2008] [Indexed: 05/27/2023]
Abstract
The effect of fish waste (FW), abattoir wastewater (AW) and waste activated sludge (WAS) addition as co-substrates on the fruit and vegetable waste (FVW) anaerobic digestion performance was investigated under mesophilic conditions using four anaerobic sequencing batch reactors (ASBR) with the aim of finding the better co-substrate for the enhanced performance of co-digestion. The reactors were operated at an organic loading rate of 2.46-2.51 g volatile solids (VS)l(-1)d(-1), of which approximately 90% were from FVW, and a hydraulic retention time of 10 days. It was observed that AW and WAS additions with a ratio of 10% VS enhanced biogas yield by 51.5% and 43.8% and total volatile solids removal by 10% and 11.7%, respectively. However FW addition led to improvement of the process stability, as indicated by the low VFAs/Alkalinity ratio of 0.28, and permitted anaerobic digestion of FVW without chemical alkali addition. Despite a considerable decrease in the C/N ratio from 34.2 to 27.6, the addition of FW slightly improved the gas production yield (8.1%) compared to anaerobic digestion of FVW alone. A C/N ratio between 22 and 25 seemed to be better for anaerobic co-digestion of FVW with its co-substrates. The most significant factor for enhanced FVW digestion performance was the improved organic nitrogen content provided by the additional wastes. Consequently, the occurrence of an imbalance between the different groups of anaerobic bacteria which may take place in unstable anaerobic digestion of FVW could be prevented.
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Affiliation(s)
- H Bouallagui
- Laboratory of Microbial Ecology and Technology, National Institute of Applied Sciences and Technology, Tunis, Tunisia.
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Mesophilic and thermophilic anaerobic co-digestion of abattoir wastewater and fruit and vegetable waste in anaerobic sequencing batch reactors. Biodegradation 2008; 20:401-9. [DOI: 10.1007/s10532-008-9231-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2008] [Accepted: 10/27/2008] [Indexed: 10/21/2022]
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Ward AJ, Hobbs PJ, Holliman PJ, Jones DL. Optimisation of the anaerobic digestion of agricultural resources. BIORESOURCE TECHNOLOGY 2008; 99:7928-40. [PMID: 18406612 DOI: 10.1016/j.biortech.2008.02.044] [Citation(s) in RCA: 431] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2007] [Revised: 02/25/2008] [Accepted: 02/28/2008] [Indexed: 05/16/2023]
Abstract
It is in the interest of operators of anaerobic digestion plants to maximise methane production whilst concomitantly reducing the chemical oxygen demand of the digested material. Although the production of biogas through anaerobic digestion is not a new idea, commercial anaerobic digestion processes are often operated at well below their optimal performance due to a variety of factors. This paper reviews current optimisation techniques associated with anaerobic digestion and suggests possible areas where improvements could be made, including the basic design considerations of a single or multi-stage reactor configuration, the type, power and duration of the mixing regime and the retention of active microbial biomass within the reactor. Optimisation of environmental conditions within the digester such as temperature, pH, buffering capacity and fatty acid concentrations is also discussed. The methane-producing potential of various agriculturally sourced feedstocks has been examined, as has the advantages of co-digestion to improve carbon-to-nitrogen ratios and the use of pre-treatments and additives to improve hydrolysis rates or supplement essential nutrients which may be limiting. However, perhaps the greatest shortfall in biogas production is the lack of reliable sensory equipment to monitor key parameters and suitable, parallelised control systems to ensure that the process continually operates at optimal performance. Modern techniques such as software sensors and powerful, flexible controllers are capable of solving these problems. A direct comparison can be made here with, for instance, oil refineries where a more mature technology uses continuous in situ monitoring and associated feedback procedures to routinely deliver continuous, optimal performance.
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Affiliation(s)
- Alastair J Ward
- School of Chemistry, University of Wales - Bangor, Bangor, Gwynedd LL57 2UW, UK.
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