The effects of different mixing intensities during anaerobic digestion of the organic fraction of municipal solid waste

Identifying proper agitation interval to prevent floating layers formation of corn stover and improve biogas production in anaerobic digestion

“…The results indicated that floating layer formation had important effect on biogas production, and the proper agitation intervals could be determined by floating test and validated in terms of biogas production. On the other hand, the energy efficiency of one anaerobic digestion system can be increased as the balance between biogas production and the energy demand of the process can be improved by reducing agitation periods (Lindmark et al, 2014a). For the digesters with similar biogas production rate, the digester with longer agitation interval would cost less energy as the time used for agitation decreased, hence, would have high system energy efficiency.…”

“…Mixing is very important to solve above problems for effective anaerobic digestion as sufficient mixing could enhance digester performance by achieving a good distribution of substrates, microorganisms and enzymes in the digester (Hoffmann et al, 2008;Lindmark et al, 2014a;Stroot et al, 2001). Inadequate mixing could cause stratification processes, such as sedimentation and solid particle floatation (Subramanian and Pagilla, 2014).…”

“…Different kinds of agitation intensity (or stirring rate) (Gómez et al, 2006;Hoffmann et al, 2008;Stafford, 1982) and agitation durations (or interval) (Cubas et al, 2011;Kowalczyk et al, 2013;Lindmark et al, 2014a) were applied in anaerobic digestion processes. The effects of different intensities or intervals on biogas production are always different because conditions such as substrate, loading concentration or temperature are not same.…”

Büyükbaş Hayvan Atıkları ile Sera Hasat Atıklarından Biyogaz Üretimi ve Birlikte Anaerobik Parçalanma Prosesinin Modellenmesi

“…Anaerobik parçalanma teknolojisi farklı organik atıklardan enerji üretiminde kullanılmasına rağmen hayvan gübrelerinde bulunan yüksek amonyak/amonyum içeriği anaerobik mikroorganizmaların aktivitesini azaltmaktadır. Bu nedenle, son çalışmalar mikrobiyal aktiviteyi hızlandırmak ve biyogaz üretimini maksimize etmek için optimum proses koşullarının belirlenmesi üzerine yoğunlaşmıştır (Lindmark et al 2014;Arıkan ve ark. 2015;Di Maria and Barratta 2015).…”

Economic and environmental comparison between two scenarios of waste management: MBT vs thermal treatment

“…As an alternative, mechanical separation systems downstream of the selective collection can be used to separate the wastes into three fractions: a fuel fraction (known as RDF, refuse derived fuel, which can be used in specific dedicated plants or introduced into the general fuel market [Sarc and Lorber, 2013]), a wet fraction (for which, with the possibility of biological anaerobic digestion plants, there is also a prospect for additional energy valorization [Wana et al, 2013;Fernández-Rodríguez et al, 2014;Krishna and Kalamdhad, 2014;Ariunbaatar et al, 2014;Lindmark et al, 2014;Bolzonella et al, 2006]), and a mineral fraction (for which there is currently no viable option except their disposal in a landfill).…”