scholarly journals Environmental-Economic Analysis of Integrated Organic Waste and Wastewater Management Systems: A Case Study from Aarhus City (Denmark)

2018 ◽  
Vol 10 (10) ◽  
pp. 3742 ◽  
Author(s):  
Marianne Thomsen ◽  
Daina Romeo ◽  
Dario Caro ◽  
Michele Seghetta ◽  
Rong-Gang Cong
Keyword(s):  
Food Waste ◽  
Organic Waste ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Environmental Benefits ◽  
Anaerobic Sludge ◽  
Wastewater Management ◽  
Management Scenarios ◽  
Trade Offs ◽  
Biogas Plants

This study presents a comparative analysis of the environmental and economic performances of four integrated waste and wastewater management scenarios in the city of Aarhus in Denmark. The purpose of this analysis is to deliver decision support regarding whether (i) the installation of food waste disposers in private homes (AS1) or (ii) separate collection and transport of organic waste to biogas plants is a more viable environmental and economic solution (AS2). Higher environmental benefits, e.g., mitigation of human health impacts and climate change, are obtained by transforming the existing waste combustion system into scenario (ii). Trade-offs in terms of increased marine eutrophication and terrestrial ecotoxicity result from moving up the waste hierarchy; i.e., from waste incineration to biogas production at wastewater treatment plants with anaerobic sludge digestion. Scenario (i) performs with lower energy efficiency compared to scenario (ii). Furthermore, when considering the uncertainty in the extra damage cost to the sewer system that may be associated to the installation of food waste disposers, scenario (ii) is the most flexible, robust, and less risky economic solution. From an economic, environmental, and resource efficiency point of view, separate collection and transport of biowaste to biogas plants is the most sustainable solution.

scholarly journals Sugarcane Bagasse as a Co-Substrate with Oil-Refinery Biological Sludge for Biogas Production Using Batch Mesophilic Anaerobic Co-Digestion Technology: Effect of Carbon/Nitrogen Ratio

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 590
Author(s):  
Aiban Abdulhakim Saeed Ghaleb ◽  
Shamsul Rahman Mohamed Kutty ◽  
Gasim Hayder Ahmed Salih ◽  
Ahmad Hussaini Jagaba ◽  
Azmatullah Noor ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Sugarcane Bagasse ◽  
Organic Waste ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Raw Materials ◽  
Oil Refinery ◽  
Methane Yield ◽  
Oil Refineries ◽  
Biological Sludge

Man-made organic waste leads to the rapid proliferation of pollution around the globe. Effective bio-waste management can help to reduce the adverse effects of organic waste while contributing to the circular economy at the same time. The toxic oily-biological sludge generated from oil refineries’ wastewater treatment plants is a potential source for biogas energy recovery via anaerobic digestion. However, the oily-biological sludge’s carbon/nitrogen (C/N) ratio is lower than the ideal 20–30 ratio required by anaerobic digestion technology for biogas production. Sugarcane bagasse can be digested as a high C/N co-substrate while the oily-biological sludge acts as a substrate and inoculum to improve biogas production. In this study, the best C/N with co-substrate volatile solids (VS)/inoculum VS ratios for the co-digestion process of mixtures were determined empirically through batch experiments at temperatures of 35–37 °C, pH (6–8) and 60 rpm mixing. The raw materials were pre-treated mechanically and thermo-chemically to further enhance the digestibility. The best condition for the sugarcane bagasse delignification process was 1% (w/v) sodium hydroxide, 1:10 solid-liquid ratio, at 100 °C, and 150 rpm for 1 h. The results from a 33-day batch anaerobic digestion experiment indicate that the production of biogas and methane yield were concurrent with the increasing C/N and co-substrate VS/inoculum VS ratios. The total biogas yields from C/N 20.0 with co-substrate VS/inoculum VS 0.06 and C/N 30.0 with co-substrate VS/inoculum VS 0.18 ratios were 2777.0 and 9268.0 mL, respectively, including a methane yield of 980.0 and 3009.3 mL, respectively. The biogas and methane yield from C/N 30.0 were higher than the biogas and methane yields from C/N 20.0 by 70.04 and 67.44%, respectively. The highest biogas and methane yields corresponded with the highest C/N with co-substrate VS/inoculum VS ratios (30.0 and 0.18), being 200.6 mL/g VSremoved and 65.1 mL CH4/g VSremoved, respectively.

scholarly journals Biogas potential of organic waste onboard cruise ships — a yet untapped energy source

2021 ◽  
Author(s):  
Kai Schumüller ◽  
Dirk Weichgrebe ◽  
Stephan Köster
Keyword(s):  
Energy Source ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Food Waste ◽  
Energy Demand ◽  
Organic Waste ◽  
Biogas Production ◽  
Biogas Yield ◽  
Cruise Ships ◽  
Detailed Presentation

AbstractTo tap the organic waste generated onboard cruise ships is a very promising approach to reduce their adverse impact on the maritime environment. Biogas produced by means of onboard anaerobic digestion offers a complementary energy source for ships’ operation. This report comprises a detailed presentation of the results gained from comprehensive investigations on the gas yield from onboard substrates such as food waste, sewage sludge and screening solids. Each person onboard generates a total average of about 9 kg of organic waste per day. The performed analyses of substrates and anaerobic digestion tests revealed an accumulated methane yield of around 159 L per person per day. The anaerobic co-digestion of sewage sludge and food waste (50:50 VS) emerged as particularly effective and led to an increased biogas yield by 24%, compared to the mono-fermentation. In the best case, onboard biogas production can provide an energetic output of 82 W/P, on average covering 3.3 to 4.1% of the total energy demand of a cruise ship.

scholarly journals Geospatial Analysis and Environmental Impact Assessment of a Holistic and Interdisciplinary Approach to the Biogas Sector

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5374
Author(s):  
Robert Bedoić ◽  
Goran Smoljanić ◽  
Tomislav Pukšec ◽  
Lidija Čuček ◽  
Davor Ljubas ◽  
...  
Keyword(s):  
Biogas Production ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Interdisciplinary Approach ◽  
Environmental Benefits ◽  
Maize Silage ◽  
Alternative Pathways ◽  
Agriculture Industry ◽  
Biogas Plants ◽  
The Impact

Crop-based biogas energy production, in combination with electricity generation under subsidy schemes, is no longer considered a favourable business model for biogas plants. Switching to low-cost or gate fee feedstocks and utilising biogas via alternative pathways could contribute to making existing plants fit for future operations and could open up new space for further expansion of the biogas sector. The aim of this study was to combine a holistic and interdisciplinary approach for both the biogas production side and the utilisation side to evaluate the impact of integrating the biogas sector with waste management systems and energy systems operating with a high share of renewable energy sources. The geospatial availability of residue materials from agriculture, industry and municipalities was assessed using QGIS software for the case of Northern Croatia with the goal of replacing maize silage in the operation of existing biogas plants. Furthermore, the analysis included positioning new biogas plants, which would produce renewable gas. The overall approach was evaluated through life cycle assessment using SimaPro software to quantify the environmental benefits and identify the bottlenecks of the implemented actions. The results showed that the given feedstocks could replace 212 GWh of biogas from maize silage in the relevant region and create an additional 191 GWh of biomethane in new plants. The LCA revealed that the proposed measures would contribute to the decarbonisation of natural gas by creating environmental benefits that are 36 times greater compared to a business-as-usual concept. The presented approach could be of interest to stakeholders in the biogas sector anywhere in the world to encourage further integration of biogas technologies into energy and environmental transitions.

scholarly journals Simultaneous Denitrification and Bio-Methanol Production for Sustainable Operation of Biogas Plants

2019 ◽  
Vol 11 (23) ◽  
pp. 6658 ◽  
Author(s):  
I-Tae Kim
Keyword(s):  
Wastewater Treatment ◽  
Carbon Source ◽  
Food Waste ◽  
Treatment Process ◽  
Wastewater Treatment Plants ◽  
Treatment Efficiency ◽  
Wastewater Treatment Process ◽  
Methanol Production ◽  
Sustainable Operation ◽  
Biogas Plants

This study was conducted to secure the sustainability of biogas plants for generating resources from food waste (FW) leachates, which are prohibited from marine dumping and have been obligated to be completely treated on land since 2013 in South Korea. The aim of this study is to reduce the nitrogen load of the treatment process while producing bio-methanol using digested FW leachate diverted into wastewater treatment plants. By using biogas in conditions where methylobacter (M. marinus 88.2%) with strong tolerance to highly chlorinated FW leachate dominated, 3.82 mM of methanol production and 56.1% of total nitrogen (TN) removal were possible. Therefore, the proposed method can contribute to improving the treatment efficiency by accommodating twice the current carried-in FW leachate amount based on TN or by significantly reducing the nitrogen load in the subsequent wastewater treatment process. Moreover, the produced methanol can be an effective alternative for carbon source supply for denitrification in the subsequent process.

scholarly journals MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

2020 ◽  
Vol 10 (8) ◽  
pp. 2921 ◽  
Author(s):  
Mohsen Parchami ◽  
Steven Wainaina ◽  
Amir Mahboubi ◽  
David I’Ons ◽  
Mohammad J. Taherzadeh
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Food Waste ◽  
Volatile Fatty Acids ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Economic Assessment ◽  
Ph Control ◽  
Daily Basis ◽  
Solids Concentration

The significant amount of excess sewage sludge (ESS) generated on a daily basis by wastewater treatment plants (WWTPs) is mainly subjected to biogas production, as for other organic waste streams such as food waste slurry (FWS). However, these organic wastes can be further valorized by production of volatile fatty acids (VFAs) that have various applications such as the application as an external carbon source for the denitrification stage at a WWTP. In this study, an immersed membrane bioreactor set-up was proposed for the stable production and in situ recovery of clarified VFAs from ESS and FWS. The VFAs yields from ESS and FWS reached 0.38 and 0.34 gVFA/gVSadded, respectively, during a three-month operation period without pH control. The average flux during the stable VFAs production phase with the ESS was 5.53 L/m2/h while 16.18 L/m2/h was attained with FWS. Moreover, minimal flux deterioration was observed even during operation at maximum suspended solids concentration of 32 g/L, implying that the membrane bioreactors could potentially guarantee the required volumetric productivities. In addition, the techno-economic assessment of retrofitting the membrane-assisted VFAs production process in an actual WWTP estimated savings of up to 140 €/h for replacing 300 kg/h of methanol with VFAs.

scholarly journals Anaerobic Co-Digestion of Pig and Cow Manure with a Solar Dried Mixture of Food Waste and Olive Mill Wastewater

Proceedings ◽  
2020 ◽  
Vol 30 (1) ◽  
pp. 91
Author(s):  
Nikolaos Papastefanakis ◽  
Chryssa Bouki ◽  
Michail S. Fountoulakis ◽  
Christos Tsompanidis ◽  
Theofanis Lolos ◽  
...  
Keyword(s):  
Food Waste ◽  
Biogas Production ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Olive Mill Wastewater ◽  
Anaerobic Sludge ◽  
Cow Manure ◽  
Drying Process ◽  
Working Volume ◽  
Olive Mill

Biogas production through anaerobic digestion is a well-established practice worldwide combining waste treatment and energy production at the same time. One of the challenges of this technology is to increase the yield of biogas production and secure the disposal of the effluent of anaerobic reactors. It is well known that various organic residues such as cheese whey, olive mill wastewater, as well as food waste from hotel units, could be combined with other materials (animal manures, sewage sludge, etc.) in order to increase biogas production through co-digestion. However, their high seasonal variation and high transport costs is a barrier for their use. Solar drying process can be a very attractive technology for volume reduction in order to decrease the storage and the transportation cost. Moreover using solar energy may well be an alternative solution for reduction of drying process costs. In this study, co-digestion of pig manure (PM) and cow manure (CM) with solar dried mixture of food waste (FW) and olive mill wastewater (OMW), named as biobooster, was studied in an attempt to improve biogas production of existing on—farms plants which co-digest manure with other farm waste. The effect of biobooster in biogas production was investigated using three lab-scale continuous stirred-tank reactors (CSTR) (3 L working volume) (D1–D3) under mesophilic conditions (37 ± 2 °C) with a hydraulic retention time of 20 days. Initially, all reactors were inoculated with anaerobic sludge originating from sewage treatment plant of the city of Heraklion, and contained 19.6 g/L TS, 10.8 g/L VS and 17.5 g/L COD. Three types of influent feedstock were utilized: D1: PM (95%) + CM (5%) (VSin = 33.58 ± 4.51 g/L), D2: PM (95%) + CM (5%) + Biobooster (1%) (VSin = 41.07 ± 7.16 g/L), D3: PM (100%) + Biobooster (1%) (VSin = 8.48 ± 0.87 g/L). The experiments showed that the addition of biobooster to pig and cow manure significantly increased biogas production by nearly 65% as value of 662.75 ± 172.50 mL/l/d compared to that with pig and cow manure alone (402.60 ± 131.89 mL/l/d). The biogas production in D3 reactor was 242.50 ± 56.82 mL/l/d. This work suggests that methane can be improved very efficiently by adding a small portion (20% increase of VS) of dried agro-industrial by-products in the inlet of digesters of existing on—farms plants.

Biogas Production Using Codigestion of Organic Residues with Malt Bagasse

2021 ◽  
Vol 47 (1) ◽  
pp. 174-180
Author(s):  
Henrique Sousa do Nascimento ◽  
Geísa Vieira Vasconcelos Magalhães ◽  
José Demontier Vieira de Souza-Filho ◽  
Ronaldo Stefanutti ◽  
Ari Clecius Alves de Lima ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Organic Waste ◽  
Biogas Production ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Operational Conditions ◽  
Different Types ◽  
Anaerobic Sludge Blanket ◽  
Bagasse Waste

This study evaluated the use of two anaerobic bioreactors in the production of biogas from malt bagasse waste. Bioreactor B1 was loaded with a mixture of 600mL of anaerobic sludge, 300g of organic waste, taken from an upflow anaerobic sludge blanket (UASB) reactor, and 300g of malt bagasse residue. Bioreactor B2 was loaded with a mixture of 600g of organic waste and 600mL of anaerobic sludge taken from an UASB reactor. The anaerobic digestion processes lasted for 10 weeks and the produced methane fraction was measured in 5 occasions. Bioreactor B1 presented low methane production (7.2%) but Bioreactor B2 showed a much more signif- icant percentage, reaching up to 48.3%. The experiments were capable of reproducing largescale operational conditions, enabling increased results in biogas capturing and processing, strengthening sustainability and energy efficiency. The experiment also showed the importance of studying different types of organic waste, seeking optimization of anaerobic digestion pro- cesses.

Evaluation of the efficiency of using individual biogas plants for processing biowaste of peasant farms

Ekonomika APK ◽  
2021 ◽  
Vol 317 (3) ◽  
pp. 50-60
Author(s):  
Natalia Pryshliak
Keyword(s):  
Natural Gas ◽  
Biogas Production ◽  
Economic Benefits ◽  
Environmental Benefits ◽  
Practical Significance ◽  
Household Waste ◽  
Positive Effects ◽  
Current State ◽  
Analysis And Synthesis ◽  
Biogas Plants

The purpose of the article is to determine the prospects for the introduction of biogas technologies by households in Ukraine and the energy, economic and environmental benefits from their use. Research methods. Dialectical methods of cognition of processes and phenomena, analysis and synthesis were used - to study the current state of waste accumulation by households; empirical - for a comprehensive assessment of the current state of household provision; scientific abstraction - to summarize the results, form conclusions and determine the prospects for biogas production in peasant households in Ukraine. Research results. The analysis of the main characteristics of households in Ukraine is carried out and the prerequisites for organizing the production of biogas by households are determined. According to the assessment of household income and expenses, it was determined that the costs of housing and communal services tend to grow. In addition, the prices for natural gas for the population will also grow, thus replacing natural gas with biogas of our own production becomes especially relevant. The potential of biogas production from household waste in Ukraine has been analyzed. The positive economic and environmental factors of the construction of individual biogas plants for rural residents are characterized. A number of measures have been proposed to facilitate the construction of individual biogas plants. The positive effects of waste and wastewater utilization have been determined. Proposals have been formulated for the development of individual biogas plants in Ukraine. Scientific novelty. The advantages of biogas production in individual biogas plants from biowaste in Ukraine have been substantiated. The economic benefits of biogas production by households are presented. Possible obstacles for the construction of individual biogas plants are considered. Practical significance. The applied significance of the results is considered as the basis for the formation of a strategy for the production of biofuels from agricultural crops and waste in Ukraine. Tabl.: 6. Figs.: 3. Refs.: 13.

scholarly journals Diverse Microbial Community Profiles of Propionate-Degrading Cultures Derived from Different Sludge Sources of Anaerobic Wastewater Treatment Plants

2020 ◽  
Vol 8 (2) ◽  
pp. 277 ◽  
Author(s):  
Pantakan Puengrang ◽  
Benjaphon Suraraksa ◽  
Peerada Prommeenate ◽  
Nimaradee Boonapatcharoen ◽  
Supapon Cheevadhanarak ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
16S Rrna Gene Sequencing ◽  
Anaerobic Sludge ◽  
Rrna Gene ◽  
Inside Information ◽  
Microbial Profile ◽  
Rrna Gene Sequencing ◽  
Enriched Cultures

Anaerobic digestion (AD) has been used for wastewater treatment and production of renewable energy or biogas. Propionate accumulation is one of the important problems leading to an unstable system and low methane production. Revealing propionate-degrading microbiome is necessary to gain a better knowledge for alleviation of the problem. Herein, we systematically investigated the propionate-degrading cultures enriched from various anaerobic sludge sources of agro-industrial wastewater treatment plants using 16S rRNA gene sequencing. Different microbial profiles were shown even though the methanogenic activities of all cultures were similar. Interestingly, non-classical propionate-degrading key players Smithella, Syntrophomonas, and Methanosaeta were observed as common prevalent taxa in our enriched cultures. Moreover, different hydrogenotrophic methanogens were found specifically to the different sludge sources. The enriched culture of high salinity sludge showed a distinct microbial profile compared to the others, containing mainly Thermovirga, Anaerolinaceae, Methanosaeta, Syntrophobactor, and Methanospirillum. Our microbiome analysis revealed different propionate-degrading community profiles via mainly the Smithella pathway and offers inside information for microbiome manipulation in AD systems to increase biogas production corresponding to their specific microbial communities.

scholarly journals Perbandingan sampah organik rumah tangga dengan sampah organik pasar terhadap kuantitas biogas

2018 ◽  
Vol 16 (2) ◽  
pp. 43
Author(s):  
Subur Mulyanto ◽  
Zulkifli Zulkifli ◽  
Elisabeth Milaningrum
Keyword(s):  
Food Waste ◽  
Organic Waste ◽  
Biogas Production ◽  
Gas Content ◽  
Methane Gas ◽  
Household Food ◽  
Long Time ◽  
Selection Of ◽  
The Way

Abstrak Penelitian ini bertujuan untuk mengetahui bagaimana cara dan proses pembuatan biogas untuk mendapatkan hasil yaitu gas metana (CH4) secara maksimal dengan menggunakan bahan dari sampah organik makanan rumah tangga dan sampah organik pasar. Jenis penelitian ini adalah eksperimen, dimana penulis melakukan perencanaan, perancangan, pembuatan, dan pengujian secara langsung dilapangan untuk mengetahui hasil dari percobaan tersebut. Proses dalam penelitian menggunakan bahan baku sampah pasar dan sampah organik rumah tangga yang kemudian masing–masing difermentasi selama 12 hari, setelah  dilakukan pengambilan sampel untuk uji nyala dan uji kandungan gas metana yang dihasilkan. Hasil penelitian menunjukan bahwa sampah organik pasar lebih baik digunakan sebagai bahan untuk pembuatan biogas dibandingkan dengan sampah makanan rumah tangga dikarenakan sampah organik pasar tidak memerlukan waktu yang lama untuk terbakar, pada proses pengujian kandungan gas metana sampah organik pasar memiliki kandungan gas metana yang lebih tinggi yaitu 52,8 % dibandingkan dengan sampah organik rumah tangga yang hanya 0,29 %.Kata kunci:  Biogas, Gas metana (CH4), Sampah organik pasar, Sampah organik rumah tangga, fermentasiAbstract This study aims to find out how the way and process of biogas production to obtain the results of methane (CH4) to the maximum by using materials from organic household food waste and organic waste market. This type of research is experimental, where the authors do the planning, design, manufacture, and testing directly in the field to find out the results of the experiment. The process in this study includes the selection of materials divided into 2, namely market waste and household organic waste which then each fermented for 12 days, after sampling for the test flame and test the methane gas content produced. The results showed that the market organic waste is better used as a material for the manufacture of biogas compared with household food waste because the market organic waste does not require a long time to burn, in the process of testing the methane gas content of organic waste market has a higher methane gas content 52.8% compared with household organic waste which is only 0.29%.Keywords: Biogas, Methane (CH4), Organic waste market, Household organic waste, fermentation

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