Publication: In situ methane enrichment with vacuum application to produce biogas with higher methane content
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Date
2024-01-01
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Abstract
Sludge produced in sewage treatment plants is an important source of organic matter to be used in anaerobic digestion to
produce energy-rich biogas. The biogas produced in anaerobic digesters has a critical impact on achieving carbon neutrality
and improving energy self-sufficiency. After effective upgrading, biogas can be converted into biomethane with an increased
CH4
content, resulting in a higher volumetric energy value. Upgrading biogas to biomethane thus not only improves its energy
content but also broadens its potential uses. In this study, it was aimed at enrich CH4
by removing dissolved CO2
from the
digestate using a vacuum, leveraging the solubility differences of gases in liquid. In this context, two digesters (R-T and
R–C) were operated for 194 days, and the effect of vacuum on in-situ methane enrichment was investigated. The vacuum
was only applied to the test reactor (R-T), and the CH4
percentage was increased from 63 to 87, 80, and 75% in the vacuum
exposure time intervals of 30, 10, and 5 min, respectively. Extended durations were not tested, as the rate of enrichment
decreased sharply after 30 min. The maximum energy requirement of a vacuum application was estimated at 0.124 kWh/
m3 methane. Conversely, vacuum application did not cause any deterioration in biogas production, and the methane yields
were similar in both reactors.
Keywords Biogas upgrading, Carbon dioxide, Digestate, Biomethane, Waste activated sludge, Negative pressure
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Keywords
Eczacılık, Meslek Bilimleri, Farmasötik Toksikoloji, Yaşam Bilimleri, Sağlık Bilimleri, Temel Bilimler, Mühendislik ve Teknoloji, Pharmacology and Therapeutics, Professional Sciences, Pharmaceutical Toxicology, Life Sciences, Health Sciences, Natural Sciences, Engineering and Technology, Mühendislik, Bilişim ve Teknoloji (ENG), Yaşam Bilimleri (LIFE), Mühendislik, Farmakoloji ve Toksikoloji, MÜHENDİSLİK, ÇEVRE, TOKSİKOLOJİ, Engineering, Computing & Technology (ENG), Life Sciences (LIFE), ENGINEERING, PHARMACOLOGY & TOXICOLOGY, ENGINEERING, ENVIRONMENTAL, TOXICOLOGY, Çevre Kimyası, Fizik Bilimleri, Kirlilik, Sağlık, Toksikoloji ve Mutajenez, Environmental Chemistry, Physical Sciences, Pollution, Health, Toxicology and Mutagenesis, Biogas upgrading, Biomethane, Carbon dioxide, Digestate, Negative pressure, Waste activated sludge
Citation
Sengur O., AKGÜL D., ÇALLI B., "In situ methane enrichment with vacuum application to produce biogas with higher methane content", Environmental Science and Pollution Research, 2024