Co-Fermentation of Microalgae Biomass and Miscanthus × giganteus Silage—Assessment of the Substrate, Biogas Production and Digestate Characteristics

Abstract

The development of a sustainable bioenergy market is currently largely fueled by energy crops, whose ever-increasing production competes with the global food and feed supply. Consequently, non-food crops need to be considered as alternatives for energy biomass production. Such alternatives include microalgal biomass, as well as energy crops grown on non-agricultural land. The aim of the present study was to evaluate how co-digestion of microalgal biomass with giant miscanthus silage affects feedstock properties, the biogas production process, biogas yields, methane fractions and the digestate profile. Combining giant miscanthus silage with microbial biomass was found to produce better C/N ratios than using either substrate alone. The highest biogas and methane production rates—628.00 ± 20.05 cm3/gVS and 3045.56 ± 274.06 cm3 CH4/d—were obtained with 40% microalgae in the feedstock. In all variants, the bulk of the microbial community consisted of bacteria (EUB338) and archaea (ARC915).

Methane Production from Confectionery Wastewater Treated in the Anaerobic Labyrinth-Flow Bioreactor

“…In turn, the TOC/TN ratio was at the level of 18.9. According to the literature, the optimal ratio of TOC/TN for anaerobic digestion is from 20:1 to 30:1 [40,41], however other authors found that 15 was also suitable [42]. Confectionery wastewater used in the study had a low content of dissolved matter and was characterized by a high concentration of suspended solids (Table 1).…”

Produksi Biogas Dari Kotoran Sapi Menggunakan Digester Anaerobik Tipe Batch Skala Kecil: Pengaruh Hydraulic Retention Time (HRT) Terhadap Kualitas Biogas

“…Proses bio-kimia yang terjadi pada fase dekomposisi anaerobik merupakan proses yang kompleks. Tingkat keberhasilan dari proses ini tergantung pada banyak faktor, diantaranya: jenis atau karakteristik substrat, temperatur operasi, pH, rasio karbon-nitrogen (C/N ratio), hydraulic retention time (HRT), dan organic loading rate (OLR) (Dębowski, Kazimierowicz, Zieliński, & Bartkowska, 2022;González, Peña, & Gómez, 2022;Kabeyi & Olanrewaju, 2022). Pada proses pembuatan biogas sederhana, selain stabilitas temperatur operasi, HRT menjadi variabel penting lainnya yang harus diperhatikan.…”

Development of technology for accelerated propagation of miscanthus (Miscanthus giganteus)

“…Therefore, for more than a decade there has been a search for new energy sources and the development of modern energy saving and resource conservation technologies. The solution of the energy problem is achieved in a variety of ways, one of which is the cultivation of energy plants [3,4]. The cultivation of such crops creates competition for areas for food crops.…”