Application of ADM1 for the simulation of anaerobic digestion of olive pulp under mesophilic and thermophilic conditions

2006 ◽  
Vol 54 (4) ◽  
pp. 149-156 ◽  
Author(s):  
H. Kalfas ◽  
I.V. Skiadas ◽  
H.N. Gavala ◽  
K. Stamatelatou ◽  
G. Lyberatos
Keyword(s):  
Anaerobic Digestion ◽  
Olive Oil ◽  
Volatile Fatty Acids ◽  
Two Phase ◽  
Solids Concentration ◽  
Thermophilic Conditions ◽  
Maximum Uptake Rate ◽  
Standard Values ◽  
Olive Pulp ◽  
Phase Production

The management of the wastewater originating from olive oil producing industries poses a serious environmental problem. Recently, two-phase production of olive oil has been developed, leading to almost complete elimination of the bulk of the generated wastewater and, is thus regarded as an environmentally friendly technology. However, the main waste stream (olive pulp) is a slurry material characterized by high solids concentration (∼30%), requiring stabilisation before its final disposal. The anaerobic digestion of olive pulp is studied in this work under mesophilic and thermophilic conditions in CSTR-type digesters. The digesters were fed with water-diluted (1:4) olive pulp at an HRT of 20 days and an OLR of 3.94 kg COD m−3 d−1. In order to study the process kinetics, the digesters were subjected to impulse disturbances of different substrates. The IWA anaerobic digestion model was used to simulate the reactors' response. Some key process parameters, such as the specific maximum uptake rate constants and the saturation constants for the volatile fatty acids degradation were estimated and compared with the standard values suggested by the ADM1.

scholarly journals Limiting factors for anaerobic digestion of olive mill wastewater blends under mesophilic and thermophilic conditions

2018 ◽  
Vol 49 (2) ◽  
pp. 130-137
Author(s):  
Demetrio Antonio Zema ◽  
Giovanni Zappia ◽  
Souraya Benalia ◽  
Giuseppe Zimbalatti ◽  
Enzo Perri ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Volatile Fatty Acids ◽  
Biogas Production ◽  
Olive Mill Wastewater ◽  
Limiting Factors ◽  
Citrus Peel ◽  
Thermophilic Conditions ◽  
High Concentrations ◽  
Olive Mill

Experimental trials of anaerobic digestion of olive mill wastewater (OMW) blended with other agro-industrial by-products were carried out to evaluate biogas production and sensitivity of the process to inhibiting compounds. Blends containing different percentages of OMW, digested liquid manure, and citrus peel were subjected to a batch anaerobic digestion process under both mesophilic and thermophilic conditions. The results showed that blends with percentages of OMW higher than 20% (v/v) had low methane yields due high concentrations of polyphenols (PPs) and/or volatile fatty acids (concentrations above 0.8 g kg–1 and 2.4 g L–1, respectively). The addition of other substrates such as citrus peel may have induced synergic inhibiting effects of PPs and essential oils (EO) on microbial growth. Thermophilic processes were more sensitive to these inhibiting compounds than mesophilic processes. The results of this study suggest that reducing PPs and EO concentrations in blends subject to anaerobic digestion below the inhibiting concentrations of 0.6 g L–1 and 0.5 g kg–1, respectively, is suitable. Additionally, it is advisable to maintain the volatile fatty acids content below 2 g L–1 to avoid its evident toxic effects on the growth of microorganisms in biochemical processes.

The influence of pH in the hydrolytic stage of anaerobic digestion of the organic fraction of urban solid waste

2003 ◽  
Vol 48 (6) ◽  
pp. 249-254 ◽  
Author(s):  
S. Dinamarca ◽  
G. Aroca ◽  
R. Chamy ◽  
L. Guerrero
Keyword(s):  
Anaerobic Digestion ◽  
Solid Waste ◽  
Volatile Fatty Acids ◽  
Organic Fraction ◽  
Buffer Effect ◽  
Two Phase ◽  
Protein Residues ◽  
Working Volume ◽  
Urban Solid Waste ◽  
Influence Of Ph

The influence of the pH in the first stage, the hydrolytic stage, of the anaerobic digestion of the organic fraction of urban solid waste in a two phase anaerobic reactor was studied. The reactor was fed with a solution of the organic fraction of urban solid residues containing 5 to 7% solids. Four reactors with a working volume of 3 L were used, the experiments were done at three controlled pHs; 6, 7, and 8, and one with free pH, the temperature was keep at 37°C in all the experiments. The higher degradation of TSS and VSS was obtained in the reactors operated at pH 7 and 8; 75% degradation of TSS and 85% degradation of VSS. The volatile fatty acids were determined at the different pH conditions, no significant differences were found, and as was expected, the acetic acid was found at the higher value among them (from 25 to 29 g/L). According to the results obtained it is possible to conclude that in the case of the hydrolytic stage of the anaerobic digestion of the organic fraction of urban solid waste it is not necessary to control the pH, the pH is kept stable by the buffer effect of the protein residues and other macromolecules present in the residue.

Thermophilic anaerobic fermentation of olive pulp for hydrogen and methane production: modelling of the anaerobic digestion process

2006 ◽  
Vol 53 (8) ◽  
pp. 271-279 ◽  
Author(s):  
H.N. Gavala ◽  
I.V. Skiadas ◽  
B.K. Ahring ◽  
G. Lyberatos
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Anaerobic Fermentation ◽  
Anaerobic Treatment ◽  
Two Phase ◽  
Production Of Hydrogen ◽  
Subsequent Step ◽  
Methane Potential ◽  
Olive Pulp ◽  
Semi Solid

The present study investigates the thermophilic biohydrogen and methane production from olive pulp, which is the semi-solid residue coming from the two-phase processing of olives. It focussed on: a) production of methane from the raw olive pulp; b) anaerobic bio-production of hydrogen from the olive pulp; c) subsequent anaerobic treatment of the hydrogen-effluent with the simultaneous production of methane; and d) development of a mathematical model able to describe the anaerobic digestion of the olive pulp and the effluent of hydrogen producing process. Both continuous and batch experiments were performed. The hydrogen potential of the olive pulp amounted to 1.6 mmole H2 per g TS. The methane potential of the raw olive pulp and hydrogen-effluent was as high as 19 mmole CH4 per g TS suggesting that: a) olive pulp is a suitable substrate for methane production; and b) biohydrogen production can be very efficiently coupled with a subsequent step for methane production.

scholarly journals A Novel Photocatalyst with Ferromagnetic Core Used for the Treatment of Olive Oil Mill Effluents from Two-Phase Production Process

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Javier Miguel Ochando-Pulido ◽  
Gassan Hodaifa ◽  
María Dolores Víctor-Ortega ◽  
Antonio Martínez-Ferez
Keyword(s):  
Olive Oil ◽  
Treatment Process ◽  
Pilot Scale ◽  
Photocatalytic Process ◽  
Olive Oil Mill Wastewater ◽  
Two Phase ◽  
Overall Efficiency ◽  
Washing Wastewater ◽  
Continuous Centrifugation ◽  
Phase Production

Photocatalytic degradation of olive oil mill wastewater from two-phase continuous centrifugation process was studied. A novel photocatalyst with ferromagnetic properties was characterized and investigated. The degradation capacity of the photocatalytic process of olive oil washing wastewater (OMW) and mixture of olives and olive oil (1 v/v) washing wastewaters (MOMW) was demonstrated. At lab-scale, the %COD removal and residence time (τ) for MOMW and OMW were 58.4% (τ=2 h) and 21.4% (τ=3 h), respectively. On the other hand, at pilot scale, 23.4%CODremoval, 19.2% totalphenolsremoval, and 28.1% total suspendedsolidsremovalwere registered at the end of the UV/TiO2process for OMW, whereas 58.3%CODremoval, 27.5% totalphenolsremoval, and 25.0% total suspendedsolidsremovalfor MOMW. Also, before the UV/TiO2reaction, a pH-T flocculation operation as pretreatment was realized. The overall efficiency of the treatment process for MOMW was up to 91% ofCODremoval, in contrast with 33.2% ofCODremovalfor OMW.

scholarly journals Two Phase Anaerobic Digestion System of Municipal Solid Waste by Utilizing Microaeration and Granular Activated Carbon

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 933
Author(s):  
Fernando Canul Bacab ◽  
Elda España Gamboa ◽  
Juan Enrique Ruiz Espinoza ◽  
Rosa M Leal-Bautista ◽  
Raúl Tapia Tussell ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Anaerobic Digestion ◽  
Solid Waste ◽  
Volatile Fatty Acids ◽  
Granular Activated Carbon ◽  
Aeration Rate ◽  
Packed Bed Reactor ◽  
Anaerobic Sludge ◽  
Hydrolysis Time ◽  
Two Phase

In an anaerobic digestion (AD) process, the hydrolysis phase is often limited when substrates with high concentrations of solids are used. We hypothesized that applying micro-aeration in the hydrolysis phase and the application of granular activated carbon (GAC) in the methanogenesis phase could make the AD process more efficient. A packed bed reactor (PBR) coupled with an up-flow anaerobic sludge blanket (UASB) was conducted, and its effects on methane generation were evaluated. The micro-aeration rate applied in PBR was 254 L-air/kg-Total solids (TS)-d was compared with a control reactor. Micro-aeration showed that it reduced the hydrolysis time and increased the organic matter solubilization as chemical oxygen demand (COD) increasing 200%, with a volatile fatty acids (VFAs) increment higher than 300%, compared to the control reactor (without aeration). Our findings revealed that the implementations of microaeration and GAC in the two-phase AD system could enhance methane production by reducing hydrolysis time, increasing solid waste solubilization.

Effects of Mesophilic and Thermophilic Temperature on Hydrolysis and Acidification of Organic Wastes Two-Phase Anaerobic Digestion

2013 ◽  
Vol 448-453 ◽  
pp. 1599-1604 ◽  
Author(s):  
Shan Rang Yang ◽  
Yong Zhen Li ◽  
Yu Ming Ding ◽  
Bo Zhao ◽  
Zhi Chao Liu ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Volatile Fatty Acids ◽  
Ph Value ◽  
Removal Rate ◽  
Organic Wastes ◽  
Pig Manure ◽  
Corn Straw ◽  
Two Phase ◽  
Temperature State ◽  
Mesophilic Temperature

This paper investigated the effects of mesophilic temperature (35°C) and thermophilic temperature (55°C) on the hydrolysis and acidification phase in the process of organic wastes anaerobic digestion. Here, the organic wastes refer to the mixture of corn straw and pig manure in this paper. The results show that pH value is negatively correlated with volatile fatty acids (VFAs) concentration, throughout the process both the VFAs concentration and its maximum of mesophilic temperature are bigger than that of thermophilic temperature, but it takes longer time to reach the maximum; the total solids (TS) removal rate of thermophilic temperature is 31.85% and the mesophilic temperature is 27.33%, but it needs to consume more energy to maintain a high temperature state. The above results suggest that the mesophilic is more advantageous than thermophilic temperature in the treatment of corn straw and pig manure co-digestion, but the post-disinfection treatment is needed.

Influence of hydrothermal pretreatment conditions, typology of anaerobic digestion system, and microbial profile in the production of volatile fatty acids from olive mill solid waste

2021 ◽  
Vol 9 (2) ◽  
pp. 105055
Author(s):  
Yasmim Arantes da Fonseca ◽  
Nayara Clarisse Soares Silva ◽  
Adonai Bruneli de Camargos ◽  
Silvana de Queiroz Silva ◽  
Hector Javier Luna Wandurraga ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Solid Waste ◽  
Volatile Fatty Acids ◽  
Hydrothermal Pretreatment ◽  
Microbial Profile ◽  
Olive Mill Solid Waste ◽  
Pretreatment Conditions ◽  
Olive Mill
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