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

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.

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

Water Science & Technology ◽

10.2166/wst.2003.0409 ◽

2003 ◽

Vol 48 (6) ◽

pp. 249-254 ◽

Cited By ~ 22

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.

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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

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.105055 ◽

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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Enhancing methane production from the invasive macroalga Rugulopteryx okamurae through anaerobic co-digestion with olive mill solid waste: process performance and kinetic analysis

Journal of Applied Phycology ◽

10.1007/s10811-021-02548-3 ◽

2021 ◽

Author(s):

D. de la Lama-Calvente ◽

M. J. Fernández-Rodríguez ◽

J. Llanos ◽

J. M. Mancilla-Leytón ◽

R. Borja

Keyword(s):

Anaerobic Digestion ◽

Solid Waste ◽

Methane Production ◽

Methane Yield ◽

Specific Rate ◽

Order Kinetic ◽

Two Phase ◽

First Order ◽

Olive Mill Solid Waste ◽

Olive Mill

AbstractThe biomass valorisation of the invasive brown alga Rugulopteryx okamurae (Dictyotales, Phaeophyceae) is key to curbing the expansion of this invasive macroalga which is generating tonnes of biomass on southern Spain beaches. As a feasible alternative for the biomass management, anaerobic co-digestion is proposed in this study. Although the anaerobic digestion of macroalgae barely produced 177 mL of CH4 g−1 VS, the co-digestion with a C-rich substrate, such as the olive mill solid waste (OMSW, the main waste derived from the two-phase olive oil manufacturing process), improved the anaerobic digestion process. The mixture improved not only the methane yield, but also its biodegradability. The highest biodegradability was found in the mixture 1 R. okamurae—1 OMSW, which improved the biodegradability of the macroalgae by 12.9% and 38.1% for the OMSW. The highest methane yield was observed for the mixture 1 R. okamurae—3 OMSW, improving the methane production of macroalgae alone by 157% and the OMSW methane production by 8.6%. Two mathematical models were used to fit the experimental data of methane production time with the aim of assessing the processes and obtaining the kinetic constants of the anaerobic co-digestion of different combination of R. okamurae and OMSW and both substrates independently. First-order kinetic and the transference function models allowed for appropriately fitting the experimental results of methane production with digestion time. The specific rate constant, k (first-order model) for the mixture 1 R. okamurae- 1.5 OMSW, was 5.1 and 1.3 times higher than that obtained for the mono-digestion of single OMSW and the macroalga, respectively. In the same way, the transference function model revealed that the maximum methane production rate (Rmax) was also found for the mixture 1 R. okamurae—1.5 OMSW (30.4 mL CH4 g−1 VS day−1), which was 1.6 and 2.2 times higher than the corresponding to the mono-digestions of the single OMSW and sole R. okamurae (18.9 and 13.6 mL CH4 g−1 VS day−1), respectively.

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Application of granular activated carbon packed-bed reactor in microwave radiation field to treat phenol

Chemosphere ◽

10.1016/s0045-6535(98)00432-9 ◽

1999 ◽

Vol 38 (11) ◽

pp. 2667-2680 ◽

Cited By ~ 43

Author(s):

Hua-Shan Tai ◽

Chih-Ju G. Jou

Keyword(s):

Activated Carbon ◽

Radiation Field ◽

Microwave Radiation ◽

Granular Activated Carbon ◽

Packed Bed ◽

Packed Bed Reactor

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Influence of a steam-explosion pre-treatment on the methane yield and kinetics of anaerobic digestion of two-phase olive mil solid waste or alperujo

Process Safety and Environmental Protection ◽

10.1016/j.psep.2016.04.010 ◽

2016 ◽

Vol 102 ◽

pp. 361-369 ◽

Cited By ~ 18

Author(s):

Bárbara Rincón ◽

Guillermo Rodríguez-Gutiérrez ◽

Lucía Bujalance ◽

Juan Fernández-Bolaños ◽

Rafael Borja

Keyword(s):

Anaerobic Digestion ◽

Solid Waste ◽

Steam Explosion ◽

Methane Yield ◽

Two Phase ◽

Pre Treatment ◽

Kinetics Of

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

Water Science & Technology ◽

10.2166/wst.2006.536 ◽

2006 ◽

Vol 54 (4) ◽

pp. 149-156 ◽

Cited By ~ 30

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.

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A review on strategies to optimize metabolic stages of anaerobic digestion of municipal solid wastes towards enhanced resources recovery

Sustainable Environment Research ◽

10.1186/s42834-019-0037-0 ◽

2019 ◽

Vol 29 (1) ◽

Cited By ~ 4

Author(s):

Edwin N. Richard ◽

Askwar Hilonga ◽

Revocatus L. Machunda ◽

Karoli N. Njau

Keyword(s):

Fatty Acids ◽

Trace Elements ◽

Activated Carbon ◽

Anaerobic Digestion ◽

Volatile Fatty Acids ◽

Solid Wastes ◽

Municipal Solid Wastes ◽

Ammonia Inhibition ◽

Moisture Contents ◽

Pre Treatment

AbstractRecently, there are increased efforts by municipals and researchers to investigate the potential of utilizing municipal solid wastes (MSW) for resources recovery. In many parts of developing countries, MSW is mostly collected for disposal with little emphasis on resources recovery. However, the MSW has high organic and moisture contents, and are suitable substrates for anaerobic digestion (AD) process to recover biogas for energy and digestate which can be used as fertilizers or for soil amendments. Resources recovery from the AD process consists of four metabolic stages; hydrolysis, acidogenesis, acetogenesis, and methanogenesis. These metabolic stages can be affected by several factors such as the nature of substrates, accumulation of volatile fatty acids, and ammonia inhibition. In this review, different optimization strategies towards resources recoveries such as pre-treatment, co-digestion, trace elements supplementation, optimization of key parameters and the use of granular activated carbon are discussed. The review reveals that the currently employed optimization strategies fall short in several ways and proposes the need for improvements.

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