☆ 4.8 Review

Sustainable management and recycling of anaerobic digestate solid fraction by composting: A review

BIORESOURCE TECHNOLOGY (2023)

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Tomasz Garbowski et al.

Summary: This manuscript describes the use of natural soil amendments in agriculture, including organic, organic-mineral, and mineral amendments. Algae-based amendments are becoming more popular. Natural amendments are effective in improving sandy loam and clay soils, while mineral amendments can be used as fertilizers or to restore degraded soils. Natural soil amendments can be considered as alternatives to synthetic agricultural agents.

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Article Green & Sustainable Science & Technology

A laboratory assessment of how biomass pellets could reduce indoor air pollution, mitigate climate change and benefit health compared to other solid fuels used in Ghana

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Summary: In order to reduce indoor air pollution, the government of Ghana formulated a renewable energy master plan in 2019 to distribute biomass pellets and stoves to 2,000,000 households by 2030. However, the inclusion of pellets in Ghana's energy mix and their climate and health benefits have not been empirically assessed. This laboratory study tested emissions from burning wood, charcoal, and pellets in improved cookstoves and compared their indoor air pollution reduction, personal exposure, health benefits, and climate impact.

ENERGY FOR SUSTAINABLE DEVELOPMENT (2023)

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Review Engineering, Environmental

Improving the humification by additives during composting: A review

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Article Agricultural Engineering

Integration of biogas derived from dark fermentation and anaerobic digestion of biowaste to enhance methanol production by methanotrophs

Sanjay K. S. Patel et al.

Summary: In this study, enzyme-based rice straw hydrolysate was used to produce dark-fermentative biogas, which was then integrated with biogas derived from anaerobic digestion to generate methanol via methanotrophs. The integration of these two sources resulted in the production of 13.8 mmol/L of methanol. In addition, under repeated batch mode, 64.6 mmol/L of methanol was produced. This is the first report on the integration of biogas derived from anaerobic digestion and dark-fermentative biogas to produce biomethanol. These findings could contribute to the development of a sustainable biowaste-based circular economy for biofuel production.

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Article Agricultural Engineering

Effects of bulking agents on greenhouse gases and related genes in sludge composting

Ke Wang et al.

Summary: The study found that different organic bulking agents had varied effects on gas emissions and related genes during sludge composting, with wood chip having high C/N and porosity, and wheat straw playing a crucial role in CH4 production and NH3 emission. However, there was no significant difference in N2O emission among the three bulking agents.

BIORESOURCE TECHNOLOGY (2022)

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Article Agricultural Engineering

Fallen leaves are superior to tree pruning as bulking agents in aerobic composting disposing kitchen waste

Meng Li et al.

Summary: This study compared the performance of fallen leaves and tree pruning as bulking agents in aerobic composting of kitchen waste. Results showed that fallen leaves outperformed tree pruning in terms of degradation efficiency, humification, temperature control, and gas emission. Bacterial community played a critical role in driving these results. Fallen leaves have great potential for efficient kitchen waste disposal.

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Article Green & Sustainable Science & Technology

Inter-row spacing calculation in photovoltaic fields - A new approach

Joseph Appelbaum et al.

Summary: The inter-row spacing in photovoltaic systems is crucial for reducing shading and diffuse radiation masking losses and improving the electric output. This study suggests using an acceptable level of masking losses as a criterion for determining the spacing between PV rows, as masking losses are found to be significant.

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Article Environmental Sciences

Chemically Enhanced Solid-Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Giovanni Beggio et al.

Summary: Chemically enhanced solid-liquid separation can improve membrane filterability of digestate, but may affect environmental properties of the separated solid fraction, hindering agricultural reuse. Different dosages of chemicals significantly improved centrifugation efficiency, reducing TSS concentration by up to 90%. Solid fractions showed higher Al, organic carbon, and nitrogen content due to residual chemicals, but HMs concentrations met EU regulation limits for agricultural reuse. Leaching tests indicated higher chlorides and soluble Al concentrations in water extracts, but lower HMs leachability from CES-treated digestates, which showed higher phytotoxicity likely due to Al toxicity and salinity increase. Further investigation is needed for the effects on soil-plant system when considering agricultural reuse of CES-treated digestate solid fraction.

WASTE AND BIOMASS VALORIZATION (2022)

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Article Agricultural Engineering

Use of activated carbon to reduce ammonia emissions and accelerate humification in composting digestate from food waste

Ning Wang et al.

Summary: This study investigated the effects of activated carbon (AC) on NH3 loss and humification during DFW composting, and found that the use of AC can promote humification, shorten composting time, and decrease NH3 emissions.

BIORESOURCE TECHNOLOGY (2022)

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Review Agricultural Engineering

Recent advances in biofuel production through metabolic engineering

Swati Joshi et al.

Summary: The rising global energy demands and climate crisis have created an unprecedented need for the bio-based circular economy. Metabolic engineering is at the forefront of developing microbial chassis for biofuel bio-foundries to meet the industrial needs for clean energy.

BIORESOURCE TECHNOLOGY (2022)

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Article Agricultural Engineering

The microbial mechanisms of enhanced humification by inoculation with Phanerochaete chrysosporium and Trichoderma longibrachiatum during biogas residues composting

Jing He et al.

Summary: This study investigated the effects of composite microbes on humification during co-composting of biogas residue, spent mushroom substrate, and rice straw. The results showed that the inoculation of composite microbes increased the degradation of cellulose, hemicellulose, and lignin, as well as the content of humus and humic acid. The addition of composite microbes also increased the abundance of bacteria and fungi associated with the degradation of refractory macromolecules and cellulose, and promoted the pathways of xenobiotics biodegradation and metabolism.

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Article Agricultural Engineering

Addition of mature compost improves the composting of green waste

Wan Yang et al.

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BIORESOURCE TECHNOLOGY (2022)

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Article Green & Sustainable Science & Technology

Composting food waste or digestate? Characteristics, statistical and life cycle assessment study based on an Italian composting plant

Adolfo Le Pera et al.

Summary: A life cycle assessment analysis was conducted to compare the environmental impact of compost production from food waste and digestate. The study found that anaerobic digestion of food waste prior to composting resulted in greater environmental benefits, with savings seen in multiple impact categories.

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Article Green & Sustainable Science & Technology

Advancements in net-zero pertinency of lignocellulosic biomass for climate neutral energy production

B. K. Nahak et al.

Summary: This review article discusses the use of lignocellulosic biomass as a sustainable source of energy in solid, liquid, and gas forms. The effects of physical, chemical, and biological treatments on biomass and the properties of derived energy generations are compared to commercially used fuels.

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Article Engineering, Environmental

Anaerobic digestate management, environmental impacts, and techno-economic challenges

Barbara Lamolinara et al.

Summary: Digestate is a nutrient-rich by-product from organic waste anaerobic digestion, but it can contribute to nutrient pollution without comprehensive management strategies. This study explores various aspects of digestate production, including feedstocks, processing technologies, economics, product quality, impurities, incentives, and regulations. The results indicate that feedstock, processing technology, and process operating conditions significantly influence the characteristics of digestate products. Incentive policies and regulations play a crucial role in promoting economic benefits. However, there is a lack of quality assurance certification systems for commercializing digestate products. Further development of technologies, processes, incentives, quality regulation, and social awareness is necessary for the sustainable and safe use of digestate in different applications. Future research should focus on circular business models and standardized international regulations for digestate products.

WASTE MANAGEMENT (2022)

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Article Environmental Sciences

Digestate as a Source of Nutrients: Nitrogen and Its Fractions

Wojciech Czekala

Summary: Due to fossil fuel limitations, new energy sources and organic fertilizers for agriculture are being sought. This study aims to determine the content of total nitrogen and its fractions in the raw and processed digestate from agricultural biogas plants. The results show that digestate is a nitrogen-rich fertilizer.

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Anaerobic biogas formation from crops' agricultural residues - Modeling investigations

Marvin Scherzinger et al.

Summary: The cultivation of field crops produces organic residues which can be used for biogas production, but this requires operators to have sufficient expertise to avoid overload. Laboratory testing determined the anaerobic degradability of various Egyptian agricultural residues, and a model was developed to estimate biogas production.

BIORESOURCE TECHNOLOGY (2022)

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Review Agricultural Engineering

Recent trends and advances in composting and vermicomposting technologies: A review

Yuwen Zhou et al.

Summary: Composting technologies have evolved from static heaps and windrow composting to smart, AI-assisted reactor composting. Recent efforts have focused on identifying novel process-enhancing supplements and integrating mathematical modelling and reactor designs with composting practices. Further refinement of the composting process is needed to reduce environmental impact and align with circular economy goals.

BIORESOURCE TECHNOLOGY (2022)

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Article Energy & Fuels

Biorefinery of anaerobic digestate in a circular bioeconomy: Opportunities, challenges and perspectives

Milan Malhotra et al.

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Review Chemistry, Multidisciplinary

Digestate Management and Processing Practices: A Review

Durdica Kovacic et al.

Summary: The implementation of sustainable agro-energy systems has led to increased interest in the management of animal manure. Anaerobic digestion and subsequent digestate processing technologies provide a way to stabilize manure and extract valuable resources. Composting is a preferred post-treatment method, and other technologies can also be used to convert digestate into value-added products.

APPLIED SCIENCES-BASEL (2022)

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Review Multidisciplinary Sciences

Potentiality of biodiesel and bioethanol production from feedstock in Bangladesh: A review

Dalim Kumer Roy et al.

Summary: This paper provides a review of the potential for sustainable biofuel production in Bangladesh, comparing biodiesel and bioethanol production potential with other countries. It highlights the annual production potential of various feedstocks and their utilization in biofuel production in Bangladesh.

HELIYON (2022)

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Review Energy & Fuels

Biogas Plant Operation: Digestate as the Valuable Product

Wojciech Czekala et al.

Summary: This article discusses the production and use of digestate as a fertilizer, including methods such as composting, biochar, and fertilizer granules. Numerous scientific studies indicate that digestate can be used directly as a fertilizer and can also be processed into products suitable for specific soil and plant needs. However, further research is needed, particularly on the impact of raw material diversity and processing methods on the composition and performance of digestate.

ENERGIES (2022)

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Article Green & Sustainable Science & Technology

Biogas composition from agricultural sources and organic fraction of municipal solid waste

Adelaide Calbry-Muzyka et al.

Summary: This paper provides an overview of biogas compositions from agriculture and municipal solid waste organic fraction, reporting major and minor components as well as trace compounds that could present challenges to the energetic use of biogas, especially in high efficient processes such as fuel cells or fuel upgrading units.

RENEWABLE ENERGY (2022)

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Article Environmental Sciences

Pellets from Biogas Digestates: A Substantial Source of N2O Emissions

Ioana Petrova Petrova et al.

Summary: This study aimed to investigate the potential N2O production from pellets themselves, and found that N2O release increased with decreasing pellet size fraction, with maximum fluxes observed at 62% moisture. The results suggest that the N2O emissions released by the pellets themselves can explain a major portion of the N2O fluxes measured in situ.

WASTE AND BIOMASS VALORIZATION (2021)

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Review Agriculture, Multidisciplinary

Manure management and soil biodiversity: Towards more sustainable food systems in the EU

Julia Koninger et al.

Summary: Animal farming generates over 1.4 billion tonnes of manure annually in the EU-27 and UK, with more than 90% used as organic fertilizer. Manure can enhance plant growth and soil diversity, but also poses risks of pollution and nutrient loss. Soil organisms are essential in manure transformation and degradation of toxic elements, yet soil biodiversity is often neglected in manure management practices.

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Article Agricultural Engineering

Effect of digestate and digestate supplemented with biochar on switchgrass growth and chemical composition

Moon-Sub Lee et al.

Summary: This study evaluated the nutritional value of digestate and digestate + biochar for switchgrass production, showing that they can serve as potential substitutes for chemical fertilizers, leading to increased biomass yield.

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Article Agricultural Engineering

Food waste digestate composting: Feedstock optimization with sawdust and mature compost

Bing Song et al.

Summary: Composting food waste digestate with sawdust and mature compost can effectively reduce nitrogen loss and increase seed germination index, showing promise for producing quality compost in a short period of time.

BIORESOURCE TECHNOLOGY (2021)

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Review Agricultural Engineering

Sustainable management and recycling of food waste anaerobic digestate: A review

Shanta Dutta et al.

Summary: Anaerobic digestion is widely used to produce biogas from food waste, but a significant amount of nutrient-rich food waste anaerobic digestate (FWD) remains under-utilised. FWD has potential as a nutrient source for microalgal cultivation and biofuel production, and emerging technologies like thermal conversion show promise in converting FWD into value-added products like biochar/hydrochar. Integrated AD with valorisation facilities is encouraged to achieve complete resource utilisation and reduce carbon emissions.

BIORESOURCE TECHNOLOGY (2021)

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Review Engineering, Chemical

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Zheng Yang et al.

Summary: This paper reviewed composting models from the past decade, finding that most models involved the fates of carbon and nitrogen, with only a few including phosphorus and potassium. Mechanism-derived models were relatively complex, while data-driven models could provide more accurate predictions and involve more nutrients.

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Review Agricultural Engineering

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Renisha Karki et al.

Summary: Co-digestion technology offers enhanced digestibility, improved process stability, and higher nutrient value compared to mono-digestion. A critical comparison of mono-digestion and co-digestion reveals the latter's greater flexibility and sustainability in handling diverse feedstocks.

BIORESOURCE TECHNOLOGY (2021)

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Article Energy & Fuels

Towards a Full Circular Economy in Biogas Plants: Sustainable Management of Digestate for Growing Biomass Feedstocks and Use as Biofertilizer

Linas Jurgutis et al.

Summary: The digestate is a promising biofertilizer and potential source of income for many biogas plants worldwide, containing a large amount of nutrients such as nitrogen and potassium. Its application on low-fertility land can increase biomass yield, providing an alternative strategy for diversifying the feedstock portfolio of biogas plants.

ENERGIES (2021)

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Article Energy & Fuels

Solid Fraction of Digestate from Biogas Plant as a Material for Pellets Production

Wojciech Czekala

Summary: The possibility of using digestate solid fraction (DSF) for biofuel production was explored, revealing that DSF still has energy potential post-anaerobic digestion and can be a valuable substrate for solid biofuels production.

ENERGIES (2021)

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Article Green & Sustainable Science & Technology

Techno-economic assessment at full scale of a biogas refinery plant receiving nitrogen rich feedstock and producing renewable energy and biobased fertilisers

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JOURNAL OF CLEANER PRODUCTION (2021)

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Article Engineering, Environmental

Digestate mechanical separation in industrial conditions: Efficiency profiles and fertilising potential

Aleksandra Chuda et al.

Summary: The study evaluated the influence of decanter centrifuge operating parameters on the effectiveness of digestate mechanical separation and the impact of adding flocculants on liquid-solid fraction composition. Addition of flocculants significantly increased the removal efficiency of dry matter and organic matter in the digestate, resulting in better separation results under optimal conditions.

WASTE MANAGEMENT (2021)

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Review Agricultural Engineering

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Wei Peng et al.

BIORESOURCE TECHNOLOGY (2020)

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Review Agricultural Engineering

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Substitution of mineral fertilizers with biogas digestate plus biochar increases physically stabilized soil carbon but not crop biomass in a field trial

Isabel Greenberg et al.

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