Kinetic study of biogas production from anaerobic digestion of vinasse waste

Abstract Vinasse, a sugar-ethanol residue, is used as a substrate for biogas production. The characteristics of the vinasse wastewater used were 216,000 mg-COD/L, pH 4.1, and 68.42 mg/L volatile solids. The sludge/wastewater ratio was controlled at about 1.5−2.0, by weight. Biogas production enhancement was studied in relation to two parameters – Citadel BioCat + , a commercial biocatalyst containing a large microorganism population as the methanogenic bacteria source (5 and 10 g), and reaction temparature (30 and 37 °C). Biogas production kinetics were evaluated. The presence of the biocatalyst enhanced biogas production significantly, as well as reducing the time required for anaerobic digestion. The first-order kinetic model described the biodegradation process. The best results were found using 10 g of biocatalyst at 37 °C – i.e., the optimum results based on biogas production potential (A), the highest biogas production rate (U), the minimum biogas production time (λ), and kinetic organic biodegradability constants (k) of 102.71 mL/g-COD, 11.17 mL/g-COD/d, 0.95 day, and 0.0533 day − 1, respectively. COD removal efficiency was up to 60%.

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A Real Case Study of a Full-Scale Anaerobic Digestion Plant Powered by Olive By-Products

Foods ◽

10.3390/foods10081946 ◽

2021 ◽

Vol 10 (8) ◽

pp. 1946

Author(s):

Antonia Tamborrino ◽

Filippo Catalano ◽

Alessandro Leone ◽

Biagio Bianchi

Keyword(s):

Anaerobic Digestion ◽

Biogas Production ◽

Storage Conditions ◽

Methanogenic Bacteria ◽

Full Scale ◽

Specific Production ◽

Production Values ◽

Volatile Solids ◽

Olive Pulp ◽

By Products

The anaerobic digestion plant studied in this paper is one of the first full-scale plants using olive oil by-products. This is a two-stage plant with a power of 100 kWe. Two tests were performed: the first on olive pulp and pitted pomace and the second on biomass consisting of 10% crushed cereal. In both cycles, the retention time was 40 days. The production of biogas was between 51 and 52 m3/h, with limited fluctuations. The specific production values of biogas indicate that a volume of biogas greater than 1 m3/kg was produced in both tests. The produced biogas had a methane percentage of about 60% and the specific production (over total volatile solids, TVS) of methane was of the order of 0.70 m3methane/kgTVS. FOS/Alk (ratio between volatile organic acids and alkalinity) was always lower than 1 and tended to decrease in the second digester, indicating a stable methanogenic phase and the proper working of the methanogenic bacteria in the second reactor. The concentration of incoming biomass TPC (total polyphenols content) can vary significantly, due to the seasonality of production or inadequate storage conditions, but all measured values of TPC, between 1840 and 3040 mg gallic acid kg−1, are considered toxic both for acidogenic and methanogenic bacteria. By contrast, during the process the polyphenols decreased to the minimum value at the end of the acidogenic phase, biogas production did not stop, and the methane percentage was high.

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Evaluation of batch mesophilic anaerobic digestion of raw and trampled llama and dromedary dungs: methane potential and kinetic study

Biomass Conversion and Biorefinery ◽

10.1007/s13399-021-02255-6 ◽

2022 ◽

Author(s):

M. J. Fernández-Rodríguez ◽

J. M. Mancilla-Leytón ◽

D. de la Lama-Calvente ◽

R. Borja

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Hydrolysis Rate ◽

Order Kinetic ◽

Batch Mode ◽

First Order ◽

Volatile Solids ◽

Order Kinetic Model ◽

Methane Potential ◽

Methane Production Rate

AbstractThis research was carried out with the aim to evaluate the anaerobic digestion (AD) of llama and dromedary dungs (both untreated and trampled) in batch mode at mesophilic temperature (35 °C). The biochemical methane potential (BMP) tests with an inoculum to substrate ratio of 2:1 (as volatile solids (VS)) were carried out. The methane yield from trampled llama dung (333.0 mL CH4 g−1 VSadded) was considerably higher than for raw llama, raw and trampled dromedary dungs (185.9, 228.4, 222.9 mL CH4 g−1 VSadded, respectively). Therefore, trampled llama dung was found to be the best substrate for methane production due to its high content of volatile solids as well as its high nitrogen content (2.1%) and more appropriate C/N ratio (23.6) for AD. The experimental data was found to be in accordance with both first-order kinetic and transference function mathematical models, when evaluating the experimental methane production against time. By applying the first-order kinetic model, the hydrolysis rate constants, kh, were found to be 19% and 11% higher for trampled dungs in comparison with the raw dung of dromedary and llama, respectively. In addition, the maximum methane production rate (Rm) derived from the transference function model for trampled llama dung (22.0 mL CH4 g−1 VS d−1) was 83.3%, 24.4% and 22.9% higher than those obtained for raw llama manure and for raw and trampled dromedary dungs, respectively.

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Analysis of the physicochemical process in the production of biogas from equine manure

Journal of Physics Conference Series ◽

10.1088/1742-6596/2139/1/012009 ◽

2021 ◽

Vol 2139 (1) ◽

pp. 012009

Author(s):

J M Sanchez-Beltrán ◽

J C Acevedo-Páez ◽

F Moreno Gamboa

Keyword(s):

Organic Matter ◽

Anaerobic Digestion ◽

Chemical Oxygen Demand ◽

Biogas Production ◽

Oxygen Demand ◽

Physicochemical Process ◽

Methanogenic Bacteria ◽

Volatile Solids ◽

Lower Heating Value ◽

Ph Level

Abstract The present research aims to evaluate the physicochemical variables involved in the anaerobic digestion process to produce methane from manure on an agricultural farm; the farm has 2 equines that generate 12 Kg of manure per day. A manure sample was collected, and the following physicochemical parameters were determined: total solids, volatile solids, chemical oxygen demand, and pH. A tubular household biodigester was then implemented, consisting mainly of a polyethylene geomembrane that stores the organic matter and in which anaerobic digestion takes place. The performance of the biodigester was determined by the removal of organic matter quantified by volatile solids and chemical oxygen demand in the biodigester influent and digestate, of which removal of 82% of volatile solids and 74% of chemical oxygen demand was achieved. The average biogas production was 0.5 m3/day, and its lower heating value was 26,000 kJ/m3. The pH level of the biodigester was within the range of 6-7, in order to keep the methanogenic bacteria active, in charge of carrying out physicochemical process that guarantees anaerobic digestion and thus, the production of biogas.

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Biochemical Methane Potential of Cork Boiling Wastewater at Different Inoculum to Substrate Ratios

Applied Sciences ◽

10.3390/app11073064 ◽

2021 ◽

Vol 11 (7) ◽

pp. 3064

Author(s):

Roberta Mota-Panizio ◽

Manuel Jesús Hermoso-Orzáez ◽

Luis Carmo-Calado ◽

Gonçalo Lourinho ◽

Paulo Sérgio Duque de Brito

Keyword(s):

Anaerobic Digestion ◽

Biogas Production ◽

Treatment Plant ◽

Organic Substrates ◽

Biochemical Methane Potential ◽

Volatile Solids ◽

Working Volume ◽

Methane Potential ◽

Bmp Test ◽

Cork Industry

The present study evaluates the digestion of cork boiling wastewater (CBW) through a biochemical methane potential (BMP) test. BMP assays were carried out with a working volume of 600 mL at a constant mesophilic temperature (35 °C). The experiment bottles contained CBW and inoculum (digested sludge from a wastewater treatment plant (WWTP)), with a ratio of inoculum/substrate (Ino/CBW) of 1:1 and 2:1 on the basis of volatile solids (VSs); the codigestion with food waste (FW) had a ratio of 2/0.7:0.3 (Ino/CBW:FW) and the codigestion with cow manure (CM) had a ratio of 2/0.5:0.5 (Ino/CBW:CM). Biogas and methane production was proportional to the inoculum substrate ratio (ISR) used. BMP tests have proved to be valuable for inferring the adequacy of anaerobic digestion to treat wastewater from the cork industry. The results indicate that the biomethane potential of CBWs for Ino/CBW ratios 1:1 and 2:1 is very low compared to other organic substrates. For the codigestion tests, the test with the Ino/CBW:CM ratio of 2/0.7:0.3 showed better biomethane yields, being in the expected values. This demonstrated that it is possible to perform the anaerobic digestion (AD) of CBW using a cosubstrate to increase biogas production and biomethane and to improve the quality of the final digestate.

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Effect of Heavy Metals in the Performance of Anaerobic Digestion of Olive Mill Waste

Processes ◽

10.3390/pr8091146 ◽

2020 ◽

Vol 8 (9) ◽

pp. 1146 ◽

Cited By ~ 1

Author(s):

Khalideh Al bkoor Alrawashdeh ◽

Eid Gul ◽

Qing Yang ◽

Haiping Yang ◽

Pietro Bartocci ◽

...

Keyword(s):

Heavy Metals ◽

Anaerobic Digestion ◽

Organic Acid ◽

Biogas Production ◽

Methanogenic Bacteria ◽

Inhibitory Influence ◽

Olive Mill Waste ◽

Acid Load ◽

Mill Waste ◽

Olive Mill

This study presents an investigation on the effect of heavy metals on the production of biogas during the process of anaerobic digestion (AD) of olive mill waste (OMW). The poisonous effect and the inhibitory influence of Fe, Ni, Pb, Zn, Cu, and Cr on the digestion process are investigated and determined. Biomethanation potential tests are performed for this sake. Adding some of the heavy metals to the AD decreases the efficiency of biogas production and methane concentration and decreases the reduction in the VS, the TCOD, the SCOD, and the organic acid load. A critical increase in the total organic acid and inhibition of methanogenic bacteria was observed due to its toxicity. The toxicity of the heavy metals can be arranged according to increasing order: Cu > Ni > Pb > Cr > Zn > Fe, which leads to rapid poisoning of the active microorganisms. Iron may also exhibit stimulatory effects, but with a low rate and at a certain level. The conclusions of this work are important for the industry and help to understand how to carefully manage the presence of heavy metals in the digestate.

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Effect of inoculum to substrate ratio on biogas production of sheep paunch manure

Research in Agricultural Engineering ◽

10.17221/30/2014-rae ◽

2016 ◽

Vol 62 (No. 1) ◽

pp. 8-14 ◽

Cited By ~ 8

Author(s):

A.A. Lawal ◽

A.U. Dzivama ◽

M.K. Wasinda

Keyword(s):

Biogas Production ◽

Coefficient Of Determination ◽

Order Kinetic ◽

Production Rates ◽

Exponential Equation ◽

First Order ◽

Gompertz Equation ◽

Volatile Solids ◽

Substrate Ratio ◽

Order Kinetic Equation

Sheep paunch manure was anaerobically digested to study the effect of inoculum to substrate ratio on biogas production rates and accumulation. Inoculum to substrate ratios of 1.37, 2.05 and 4.1 were digested in biodigesters labelled R1, R2 and R3 respectively. Results showed that inoculum to substrate ratio had a significant effect on biogas production rates and accumulation. Biogas production rates increased to peak in the order of R3 (0.30526 Nm3/kg volatile solids (VS) days), R2 (0.15308 Nm3/kg VS d) and R1 (0.11009 Nm3/kg VS d) on the 5th day. The biogas production accumulation increased from 0.57195 to 1.46784 Nm3/kg VS as the inoculum to substrate ratio increased. The result of regression showed that coefficient of determination values for the linear equation ranged from 0.707 to 0.797, while the exponential equation had higher values that ranged from 0.7718 to 0.9929 showing better simulation. The modified Gompertz equation showed better simulation of the biogas production accumulation than the first order kinetic equation due to its higher coefficient of determination values.

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Trace Element Supplementation and Enzyme Addition to Enhance Biogas Production by Anaerobic Digestion of Chicken Litter

Energies ◽

10.3390/en13133477 ◽

2020 ◽

Vol 13 (13) ◽

pp. 3477

Author(s):

Navodita Bhatnagar ◽

David Ryan ◽

Richard Murphy ◽

Anne-Marie Enright

Keyword(s):

Anaerobic Digestion ◽

Trace Element ◽

Biogas Production ◽

Positive Control ◽

Negative Control ◽

Enzyme Treatment ◽

Small Scale ◽

Volatile Solids ◽

Chicken Litter ◽

Set Up

Anaerobic digestion (AD) of chicken litter (CL) is a viable alternative to disposal. However, methane yields from this primarily organic waste are quite low when mono-digested. This paper discusses the effect of an enzyme cocktail, trace element (TE) supplementation and selenium (Se) addition in small-scale batch biomethane potential (BMP) assays to enhance the AD of CL. Eleven different assays were set up in triplicate including assays containing only inoculum (blank), only CL (negative control) and cellulose and inoculum (positive control). The results indicate that both enzyme treatment and trace element supplementation enhanced the biogas and methane yield. The highest specific biogas and methane yields were noted for 1% enzyme-treated CL of 835.2 L/kg volatile solids (VS) and 460.8 L/kg VS, respectively. Usually, mono-digestion of CL is low due to high nitrogen content and the presence of recalcitrant lignocellulosic material from the bedding material. Enzyme treatment performed better than the addition of the TE mix and Se.

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Application of the IWA Anaerobic Digestion Model (ADM1) for simulating full-scale anaerobic sewage sludge digestion

Water Science & Technology ◽

10.2166/wst.2005.0557 ◽

2005 ◽

Vol 52 (1-2) ◽

pp. 487-492 ◽

Cited By ~ 21

Author(s):

Y. Shang ◽

B.R. Johnson ◽

R. Sieger

Keyword(s):

Wastewater Treatment ◽

Steady State ◽

Anaerobic Digestion ◽

Biogas Production ◽

Treatment Plant ◽

Biochemical Parameter ◽

Full Scale ◽

Anaerobic Digesters ◽

Biogas Yield ◽

Volatile Solids

A steady-state implementation of the IWA Anaerobic Digestion Model No. 1 (ADM1) has been applied to the anaerobic digesters in two wastewater treatment plants. The two plants have a wastewater treatment capacity of 76,000 and 820,000 m3/day, respectively, with approximately 12 and 205 dry metric tons sludge fed to digesters per day. The main purpose of this study is to compare the ADM1 model results with full-scale anaerobic digestion performance. For both plants, the prediction of the steady-state ADM1 implementation using the suggested physico-chemical and biochemical parameter values was able to reflect the results from the actual digester operations to a reasonable degree of accuracy on all parameters. The predicted total solids (TS) and volatile solids (VS) concentration in the digested biosolids, as well as the digester volatile solids destruction (VSD), biogas production and biogas yield are within 10% of the actual digester data. This study demonstrated that the ADM1 is a powerful tool for predicting the steady-state behaviour of anaerobic digesters treating sewage sludges. In addition, it showed that the use of a whole wastewater treatment plant simulator for fractionating the digester influent into the ADM1 input parameters was successful.

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Sludge electrooxidation as pre-treatment for anaerobic digestion

Water Science & Technology ◽

10.2166/wst.2016.555 ◽

2016 ◽

Vol 75 (4) ◽

pp. 775-781 ◽

Cited By ~ 4

Author(s):

J. A. Barrios ◽

U. Duran ◽

A. Cano ◽

M. Cisneros-Ortiz ◽

S. Hernández

Keyword(s):

Anaerobic Digestion ◽

Volatile Fatty Acids ◽

Biogas Production ◽

Oxygen Demand ◽

Wastewater Sludge ◽

Boron Doped Diamond ◽

Boron Doped ◽

Treatment Conditions ◽

Volatile Solids ◽

Pre Treatment

Anaerobic digestion of wastewater sludge is the preferred method for sludge treatment as it produces energy in the form of biogas as well as a stabilised product that may be land applied. Different pre-treatments have been proposed to solubilise organic matter and increase biogas production. Sludge electrooxidation with boron-doped diamond electrodes was used as pre-treatment for waste activated sludge (WAS) and its effect on physicochemical properties and biomethane potential (BMP) was evaluated. WAS with 2 and 3% total solids (TS) achieved 2.1 and 2.8% solubilisation, respectively, with higher solids requiring more energy. After pre-treatment, biodegradable chemical oxygen demand values were close to the maximum theoretical BMP, which makes sludge suitable for energy production. Anaerobic digestion reduced volatile solids (VS) by more than 30% in pre-treated sludge with a food to microorganism ratio of 0.15 g VSfed g−1 VSbiomass. Volatile fatty acids were lower than those for sludge without pre-treatment. Best pre-treatment conditions were 3% TS and 28.6 mA cm−2.

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Effect of Operating Conditions on the Chemical Phosphate Removal Using during Ferrous Iron Oxidation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.807-809.478 ◽

2013 ◽

Vol 807-809 ◽

pp. 478-485 ◽

Cited By ~ 1

Author(s):

Ting Li ◽

Wen Yi Dong ◽

Hong Jie Wang ◽

Jin Nan Lin ◽

Feng Ouyang ◽

...

Keyword(s):

Ferrous Iron ◽

Removal Rate ◽

Iron Oxidation ◽

Operating Conditions ◽

Phosphate Removal ◽

Order Kinetic ◽

Ferrous Iron Oxidation ◽

Order Kinetic Model ◽

Time Required ◽

Kinetics Of

In this study, the effect of operating parameters and the co-existing ions on the phosphate removal during the ferrous iron oxidation was investigated. Results showed that with the increase of DO and [Fe (II)]0, the final phosphate removal rate both increased. But with increasing of pH, the final phosphate removal rate firstly increased and then decreased when the pH was higher than 8.0. The co-existing ions affected the final removal rate significantly, and the kinetics of phosphate removal followed the pseudo-first-order kinetic model. The corresponding kobs trends for the cation followed the order of Cu2+>Mn2+>Zn2+>NH4+-N. The presence of Cu2+ promoted the phosphate removal significantly. Compared with the control, , the time required to achieve 40 % phosphate removal rate, at the condition of 0.5 mg/L Cu2+, reduced from 60 min to 10 s. However, the selective anions inhibited the phosphate removal, due to the formation of Fe-anions complexes. The effect of selective anions on the phosphate removal rate constant decreased in the order of SO42->Cl-> NO3-.

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