scholarly journals Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Fuels ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 144-167
Author(s):  
Marcos Ellacuriaga ◽  
José García-Cascallana ◽  
Xiomar Gómez
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Industrial Applications ◽  
Land Application ◽  
Operating Costs ◽  
Capital Investments ◽  
Organic Solid ◽  
Relevant Role ◽  
Operating Reactor ◽  
Energy Grid

Anaerobic digestion is traditionally used for treating organic materials. This allows the valorization of biogas and recycling of nutrients thanks to the land application of digestates. However, although this technology offers a multitude of advantages, it is still far from playing a relevant role in the energy market and from having significant participation in decarbonizing the economy. Biogas can be submitted to upgrading processes to reach methane content close to that of natural gas and therefore be compatible with many of its industrial applications. However, the high installation and operating costs of these treatment plants are the main constraints for the application of this technology in many countries. There is an urgent need of increasing reactor productivity, biogas yields, and operating at greater throughput without compromising digestion stability. Working at organic solid contents greater than 20% and enhancing hydrolysis and biogas yields to allow retention times to be around 15 days would lead to a significant decrease in reactor volume and therefore in initial capital investments. Anaerobic digestion should be considered as one of the key components in a new economy model characterized by an increase in the degree of circularity. The present manuscript reviews the digestion process analyzing the main parameters associated with digestion performance. The novelty of this manuscript is based on the link established between operating reactor conditions, optimizing treatment capacity, and reducing operating costs that would lead to unlocking the potential of biogas to promote bioenergy production, sustainable agronomic practices, and the integration of this technology into the energy grid.

scholarly journals Data on Biogas Production Quality: Evidence from the Wastewater Treatment Plant of Durrës

2021 ◽  
Vol 6 (4) ◽  
pp. 85-87
Author(s):  
Stela Sefa ◽  
Tania Floqi ◽  
Julian Sefa
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Wastewater Treatment Plant ◽  
Biogas Production ◽  
Treatment Plant ◽  
Production Quality ◽  
Treatment Area ◽  
Biochemical Processes ◽  
Energy Grid

The wastewater treatment plant (WWTPD) located in Durrës, responsible for a treatment area of 205,000 inhabitants, employs the tertiary advanced wasterwater treatment to generate biogas from activated sludge for self use. The biogas collected from the anaerobic digestion tank feed the boiler and the co-generation unit which is then transformed to power its own energy grid. In order to evaluate the quality of biogas produced by anaerobic digestion of WWTPD’s sludge, is measured the percentage of CH4 and CO2 from the biogas production during a three years period (2016 – 2018). From the performed analyses has resulted a percentage of CH4 up to 75% and 25% CO2 in 2016. While the lowest percentage of CH4 in 2018 with respectively 70% CH4 and 30% CO2. Based on the value measurements, qualitative results of biogas parameters show that physicochemical and biochemical processes are performed under strict conditions and anaerobic digestion is performed according to standards.

scholarly journals From biogas to biomethane: Techno-economic analysis of an anaerobic digestion power plant in a cattle/buffalo farm in central Italy

2019 ◽  
Vol 50 (3) ◽  
pp. 127-133 ◽  
Author(s):  
Ester Scotto di Perta ◽  
Elena Cervelli ◽  
Maria Pironti di Campagna ◽  
Stefania Pindozzi
Keyword(s):  
Anaerobic Digestion ◽  
Economic Analysis ◽  
Biogas Production ◽  
Central Italy ◽  
Hollow Fibre ◽  
Operating Costs ◽  
Electricity Production ◽  
Small Scale ◽  
Production Plant ◽  
Biomethane Production

Anaerobic digestion (AD) is a mature technology commonly used for manure treatment, both for the stabilisation of waste and for the production of energy. The introduction of new incentives could represent an opportunity for biogas production, when the current feed-in-tariffs, which improved the financial feasibility of AD plants producing electricity will end. This paper examines the feasibility of reconverting an existing AD biogas production plant into a biomethane production plant. The AD plant, in this case study, is a two-stage reactor situated in the centre of Italy and mainly fed with livestock manure from both cows and buffaloes. The economic analysis of two hypotheses is provided: i) continuing the electricity production from biogas after the end of the current incentives (2025); ii) considering the new incentives program for the biomethane and reconverting the plant, using hollow-fibre membranes for the purification of the raw biogas (SEPURAN® Green modules, EnviTec). For this purpose, investment and operating costs, based on plant monitoring data (2105.3 m3 d–1, Biogas production; 4432.9 kWh d–1, electricity production) as well as on market analysis for costs evaluation were considered. The mean biogas production for the considered year was about 30% less than the expected production, indicated by producer, highlighting the need for the optimisation of the management of the reactors. Moreover, based on the averaged methane production (June 2017-June 2018), results show that: i) plant conversion for the biomethane production is not suitable for small-scale plants, due to the high investment costs of upgrading technology (1.2 M€); ii) when current incentives end, the electricity production from biogas in the current plant may not be self-sufficient, due to the highly expensive operating costs. This paper provides a first analysis of the possible fate of the biogas plants under the new incentives.

Combined Digestion and Composting of Organic Industrial and Municipal Wastes in Switzerland

1993 ◽  
Vol 27 (2) ◽  
pp. 169-182 ◽  
Author(s):  
W. Edelmann ◽  
H. Engeli
Keyword(s):  
Anaerobic Digestion ◽  
Total Solid ◽  
Anaerobic Treatment ◽  
Operating Costs ◽  
Total Potential ◽  
Self Sufficiency ◽  
Organic Solid ◽  
Appropriate Treatment ◽  
Organic Solid Wastes ◽  
Aerobic And Anaerobic

The potential of the organic solid wastes in Switzerland from household, industry, gardens, public grounds and treatment of wood has been determined to be about 955 000 tons Total Solid (TS) per year. While lignified wastes have to be composted, wet and easily degradable wastes are suitable for anaerobic digestion. These humid wastes cause odor problems in composting facilities. For more than one third of the total potential digestion is a better solution than composting. Combined plants, where the digestion is directly combined with composting, show many advantages, such as the appropriate treatment for different substrate fractions, use of the same machineries for the pre- and the post-treatment, self-sufficiency in energy as well as utilization of the waste water derived from liquid-solid separation at the end of the digestion for the irrigation of the windrows. Detailed investment and operating costs for different aerobic and anaerobic treatment methods are presented. It is shown, that anaerobic digestion is significantly cheaper than composting. Combined plants cost rather less than plants which treat the wastes exclusively by way of composting. Therefore, the treatment of solid organic wastes in combined plants is recommended.

scholarly journals Effects of Substrate to Inoculum Ration on Biogas Production from Anaerobic Co-digestion of Office Paper and Cow Manure

2019 ◽  
pp. 1-15
Author(s):  
Autumn R. Elniski ◽  
Siddharth G. Chatterjee ◽  
Chanchal Mondal ◽  
Klaus Doelle
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Time Lag ◽  
Industrial Applications ◽  
Process Models ◽  
Future Research ◽  
Model Parameters ◽  
Cow Manure ◽  
Production Potential ◽  
Office Paper

Anaerobic digestion can utilize renewable resources to produce energy in the form of biogas. Cow manure inoculum contains the microorganisms needed for this application and unrecycled paper waste can be used as a substrate. The use of these feedstocks together is not well studied. Finding ideal operating parameters and modelling biogas production is vital for future integration of anaerobic digestion. The use of various models when examining anaerobic digestion is important to ensure the best models are used for future research and industrial applications. Office paper and cow manure were combined at the different substrate to inoculum ratios with a total solids content of 6% at 38.4°C for 15 days. Four models (Time-Lag, No-Lag, Modified Gompertz, and Modified Logistic) were fitted to the experimental data to find which model best represented each biogas production process. Models varied in the accuracy of their fit to the data and no single model had the lowest RMSE values for each treatment. The digester containing a paper to manure ratio of 2:1 produced the most biogas (82 mL biogas/g VS), but the 5:1 reactor had the greatest biogas production potential over a longer period based on the model parameters (maximum cumulative biogas yield and biogas production potential). More biogas was produced in this study compared to other works reported in the literature, showing that this combination of co-digestion substrates could be expanded upon in the future. New models need to be examined or developed for these systems to better represent this co-digestion process for future research and commercial applications.

scholarly journals Improving the Quantity and Quality of Biogas Production in Tehran Anaerobic Digestion Power Plant by Application of Materials Recirculation Technique

2020 ◽  
Vol 9 (2) ◽  
pp. 167-175
Author(s):  
Reza Naghavi ◽  
Mohammad Ali Abdoli ◽  
Abdolreza Karbasi ◽  
Mehrdad Adl
Keyword(s):  
Anaerobic Digestion ◽  
Power Plant ◽  
Fossil Fuels ◽  
Biogas Production ◽  
Solid Wastes ◽  
High Concentration ◽  
Urban District ◽  
Organic Solid ◽  
Organic Solid Wastes

Tehran anaerobic digestion power plant has been built on the eastern margin of the urban district by the purpose of processing the organic fraction of municipal solid waste. One of the most suitable methods for the treatment of organic matter is the use of anaerobic digestion (AD) process, which in addition to significant reduction of organic solid wastes, will produce valuable energy. Contributing to maintain the environment, improve urban health, saving on fossil fuels and producing rich fertilizer for agricultural use are important advantages of anaerobic digestion. The plant has been set up in 2014 with a nominal acceptance capacity of 300 tons of organic solid wastes per day and the nominal power generation of 2000 kWe. This system has been faced with considerable challenges in terms of quantity and quality of biogas during operation. The high concentration of hydrogen sulfide (H2S) in produced biogas and the lack of appropriate technologies in the plant for biogas refining are critical for the biogas generator engine deployed in the complex. The purpose of this article is to investigate the factors affecting the quality and quantity of Tehran's AD plant biogas using various H2S reduction approaches and selection of appropriate implementing technologies. The results showed that the recirculation of the digester slurry increased the methane content by more than 30% and reduced H2S by more than 98%.©2020. CBIORE-IJRED. All rights reserved

Biogas Production from Community Waste to Optimise the Substrate for Anaerobic Digestion

2018 ◽  
Vol 12 (7) ◽  
pp. 580
Author(s):  
Antony P. Pallan ◽  
S. Antony Raja ◽  
C. G. Varma ◽  
Deepak Mathew D.K. ◽  
Anil K. S. ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production

Anaerobic Digestion of Banana Wastes for Biogas Production

2020 ◽  
Vol 10 (3) ◽  
Author(s):  
Damaris Kerubo Oyaro ◽  
Zablon Isaboke Oonge ◽  
Patts Meshack Odira
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Banana Wastes

Simulation of the Impact of Higher Ammonia Recycle Loads Caused by Upgrading Anaerobic Sludge Digesters

2005 ◽  
Vol 40 (4) ◽  
pp. 491-499 ◽  
Author(s):  
Jeremy T. Kraemer ◽  
David M. Bagley
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Treatment Plant ◽  
Anaerobic Sludge ◽  
Content Increase ◽  
Limited Information ◽  
Dynamic Simulations ◽  
Treatment Train ◽  
Temperature Liquid ◽  
The Impact

Abstract Upgrading conventional single-stage mesophilic anaerobic digestion to an advanced digestion technology can increase sludge stability, reduce pathogen content, increase biogas production, and also increase ammonia concentrations recycled back to the liquid treatment train. Limited information is available to assess whether the higher ammonia recycle loads from an anaerobic sludge digestion upgrade would lead to higher discharge effluent ammonia concentrations. Biowin, a commercially available wastewater treatment plant simulation package, was used to predict the effects of anaerobic digestion upgrades on the liquid train performance, especially effluent ammonia concentrations. A factorial analysis indicated that the influent total Kjeldahl nitrogen (TKN) and influent alkalinity each had a 50-fold larger influence on the effluent NH3 concentration than either the ambient temperature, liquid train SRT or anaerobic digestion efficiency. Dynamic simulations indicated that the diurnal variation in effluent NH3 concentration was 9 times higher than the increase due to higher digester VSR. Higher recycle NH3 loads caused by upgrades to advanced digestion techniques can likely be adequately managed by scheduling dewatering to coincide with periods of low influent TKN load and ensuring sufficient alkalinity for nitrification.

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