Ammonia and methane emissions during drying of dewatered biogas digestate in a two-belt conveyor dryer

Awiszus, Sebastian; Meissner, Klaus; Reyer, Sebastian; Müller, Joachim

doi:10.1016/j.biortech.2017.09.099

Cited by 37 publications

(14 citation statements)

References 20 publications

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“…Composting and vermicomposting are both proven to be successful methods for removing pollutants (Poulsen and Bester 2010). However, vermicomposting is not suitable for the immediate remediation of WWTP sewage sludge due to the toxicity of NH 3 and CH 4 (Awiszus et al 2018). Pre-composting with a nutrient-rich bulking agent, such as cow manure or green waste, stabilizes sewage sludge (Kaushik and Garg 2003;Hanc and Dreslova 2016).…”

Section: Composting-vermicomposting Used To Remove Pollutantsmentioning

confidence: 99%

Composting and vermicomposting used to break down and remove pollutants from organic waste: a mini review

Grasserová

Hanč

Innemanová

et al. 2020

European Journal of Environmental Sciences

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Section: Composting-vermicomposting Used To Remove Pollutantsmentioning

confidence: 99%

Composting and vermicomposting used to break down and remove pollutants from organic waste: a mini review

Grasserová

Hanč

Innemanová

et al. 2020

European Journal of Environmental Sciences

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“…Biofilters with one or more preconditioning stages have become established for the waste gas treatment at most drying locations. Due to the strongly varying drying temperatures, this results in strongly varying treatment times in the dryer (minutes in the high-temperature dryers, up to seven days in low-temperature dryers) [60], as well as high variations in both waste gas temperature and pollutant concentrations [63][64][65]. For selection of the right waste gas treatment technology, preliminary tests are therefore necessary to characterize the actual emissions.…”

Section: Biofiltration In Sludge Drying Processesmentioning

confidence: 99%

Biological Waste Air and Waste Gas Treatment: Overview, Challenges, Operational Efficiency, and Current Trends

Dobslaw

Ortlinghaus²

2020

Sustainability

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International contracts to restrict emissions of climate-relevant gases, and thus global warming, also require a critical reconsideration of technologies for treating municipal, commercial, industrial, and agricultural waste gas emissions. A change from energy- and resource-intensive technologies, such as thermal post-combustion and adsorption, as well to low-emission technologies with high energy and resource efficiency, becomes mandatory. Biological processes already meet these requirements, but show restrictions in case of treatment of complex volatile organic compound (VOC) mixtures and space demand. Innovative approaches combining advanced oxidation and biofiltration processes seem to be a solution. In this review, biological processes, both as stand-alone technology and in combination with advanced oxidation processes, were critically evaluated in regard to technical, economical, and climate policy aspects, as well as present limitations and corresponding solutions to overcome these restrictions.

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“…This indicates that the impact of using additional waste-heat from the micro turbine is negligible in terms of drying behaviour, and does not result in a shorter drying time. By reaching this moisture content, the dried digestate can be stored, as an MC of less than 15% is a common target value for safe storage, whereby further degradation and microbiological processes in the digestate can be avoided [22].…”

Section: Drying Performance Of Biogas Digestatementioning

confidence: 99%

Drying Characteristics of Biogas Digestate in a Hybrid Waste-Heat/Solar Dryer

Maurer

Müller

2019

Energies

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The use of biogas plants has increased sharply in recent years. A typical biogas plant of 500 kWel produces approx. 10,000 t of digestate per year, with a moisture content of more than 90%. For the purpose of reducing the transport mass and increasing the nutrient concentration, the digestate has to be dried. Using renewable energy is a way to treat biogas digestate without any additional fossil energy requirement for drying. In this study a solar greenhouse dryer was modified to use additional waste-heat from the combined heat and power unit (variant S-CHP), as well as the exhaust gas from a micro turbine (variant S-CHP-MT). The hybrid waste-heat/solar dryer achieved a moisture content for the digestate of 10.9%, and 10.5%, after 13 d of drying for variant S-CHP-MT and S-CHP-MT, respectively. Due to the higher energy input by additional use of the micro turbine, the specific energy consumption is higher for the variant S-CHP-MT. In general, the results showed that the combination of solar energy and waste-heat from electricity generation of a biogas plant is a suitable way to reduce the moisture content of the digestate to a safe level for further handling and storage.

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Ammonia and methane emissions during drying of dewatered biogas digestate in a two-belt conveyor dryer

Cited by 37 publications

References 20 publications

Composting and vermicomposting used to break down and remove pollutants from organic waste: a mini review

Composting and vermicomposting used to break down and remove pollutants from organic waste: a mini review

Biological Waste Air and Waste Gas Treatment: Overview, Challenges, Operational Efficiency, and Current Trends

Drying Characteristics of Biogas Digestate in a Hybrid Waste-Heat/Solar Dryer

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