Digestate from Agricultural Biogas Plant – Properties and Management
0
Citation
45
Reference
10
Related Paper
Abstract:
Biogas plants are installations based on the anaerobic digestion process. As a result of the biodegradation of various substrates and waste from agriculture, biogas and digestate, which is the second product of the process, are produced. The most popular method of digestate management is its use as fertilizer, without prior processing. However, there are much more possibilities for the management of digestate and its fractions resulting from separation. The aim of the study was to discuss issues related to the properties and management of digestate from agricultural biogas plants. Due to its properties, digestate can be managed in many ways, in accordance with the circular bioeconomy and sustainable development rules. The paper discusses issues such as the production of digestate, separation into fractions, and the use of individual fractions, e.g. for fertilization and energy purposes. Analyzing the results from own research and other research available in the scientific literature, it was found that digestate is a valuable raw material with wide possibilities of its use.Keywords:
Digestate
Biogas
Due to increasing production of biogas for transportation and other purposes, generation of biogas digestate is also increased. Biogas digestate is considered as an organic fertilizer which can potentially replace mineral fertilizer used for agricultural purpose as they contain rich soil and plant nutrient. Processing and logistics of the biogas digestate became a challenging opportunity due to presence of higher water content in the raw biogas digestate that is obtained from wet anaerobic digestion process. Many research groups and organizations are involved in designing a sustainable processing mechanism for biogas digestate so that they can be marketable and commercially available as bio-fertilizers. Among various identified processing options, de-watering is an important and mandatory process (solid-liquid separation) involved in full scale biogas digestate processing. This work is focused in systemic assessment of the environmental impacts associated with biogas digestate de-watering process using Life Cycle Impact Assessment (LCIA) methodology. Various operational options are considered for the de-watering process and analyzed accordingly. A comparison from environmental and economical perspective is made within the operational options to find out which one can be efficiently used.
Digestate
Biogas
Cite
Citations (3)
In biogas plants, the process of anaerobic digestion produces biogas and boiled residue – digestate. Biogas is used for the production of heat and electricity, and the digestate was used in agriculture. Digestate is a high – quality organic fertilizer that is used to enrich agricultural land. The paper presents the basic characteristics and advantages of digestate obtained in biogas plants compared to manure and artificial fertilizers.
Digestate
Biogas
Cite
Citations (0)
Digestate
Biogas
Fraction (chemistry)
Cite
Citations (52)
Through anaerobic digestion, raw biogas is produced. This contains significant amounts of energy-containing methane, but the proportion is much lower than natural gas. In order to allow biogas to be used in specific systems, the raw biogas must be cleaned of impurities, and in some cases upgraded to bio-methane (a renewable natural gas equivalent). In addition, the digest produced from anaerobic digestion, although energy-depleted, has high levels of nutrients that can be beneficially used as a fertiliser. In order to use digestate as a fertiliser, a variety of treatments may be required to prevent hazards. In this chapter, the cleaning of the digestate and raw biogas produced in anaerobic digestion are outlined and discussed.
Digestate
Biogas
Renewable natural gas
Digestion
Cite
Citations (0)
Digestate
Biogas
Cite
Citations (13)
Anaerobic digestion is a complex biochemical process in which organic matters are mineralized and stabilized into biogas and digestate by microorganisms in the absence of oxygen. Buswell’s equation is an ideal model to represent anaerobic digestion for counting theoretical quantity of biogas and digestate in organic matters. Although the degradability and recovery of phosphorous element in digestate have been studied, the impact of phosphorous element on quantity of biomethane and theoretical biomethane potential in organophosphorous compounds are rarely explored. The quantity of biomethane is dependent on the elemental composition of organic matters, and the mean oxidation number of organic carbons is used as a counting parameter in Buswell’s equation. Biowastes which contain organophosphorous compounds are chosen to demonstrate this notion. This article has two purposes. First, the mathematical relationships among empirical formula of organic matter, mean oxidation number of organic carbons, quantity of biomethane, and theoretical biomethane potential are explored. Second, the impact of quantity of phosphorous element on quantity of biomethane, theoretical biomethane potential, and the ratio of biomethane to carbon dioxide are studied.
Digestate
Biogas
Biodegradable waste
Cite
Citations (2)
Digestate
Biogas
Data scrubbing
Cite
Citations (93)
Through anaerobic digestion, raw biogas is produced. This contains significant amounts of energy-containing methane, but the proportion is much lower than natural gas. In order to allow biogas to be used in specific systems, the raw biogas must be cleaned of impurities, and in some cases upgraded to bio-methane (a renewable natural gas equivalent). In addition, the digest produced from anaerobic digestion, although energy-depleted, has high levels of nutrients that can be beneficially used as a fertiliser. In order to use digestate as a fertiliser, a variety of treatments may be required to prevent hazards. In this chapter, the cleaning of the digestate and raw biogas produced in anaerobic digestion are outlined and discussed.
Digestate
Biogas
Renewable natural gas
Digestion
Cite
Citations (0)
The aim of this research was to assess the anaerobic digestion (AD) process at the L. Reule Bioenergy Plant, a typical UK, small holder, on farm plant. The first objective was to determine whether the plant was using its waste products to achieve the maximum possible biogas output from its digestate. The second objective was to explore the main sources of gas: household, commercial, and blended waste sources. To achieve these objectives, multiple representative samples of waste samples were taken from the AD plant and were analysed in the laboratory. The data drawn from these analyses were interpreted and synthesised to determine the representative biogas yields. Further analysis was carried out using X-ray fluorescence (XRF) techniques to determine the elemental compositions of the feedstock/waste and digestate samples in order to determine other components that might be present. The results indicate that the dry digestate that is currently not used at the L. Reule Bioenergy Plant has potential for additional biogas yield. The study also found that household waste sample had the highest fat content, which indicates a higher biogas yield potential compared to commercial and blended waste samples.
Digestate
Biogas
Energy crop
Cite
Citations (4)
Digestate
Biogas
Biodegradable waste
Cite
Citations (23)