anaerobic digestate
Recently Published Documents





2022 ◽  
Vol 140 ◽  
pp. 14-30
Barbara Lamolinara ◽  
Amaury Pérez-Martínez ◽  
Estela Guardado-Yordi ◽  
Christian Guillén Fiallos ◽  
Karel Diéguez-Santana ◽  

Processes ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 147
Alejandro Moure Abelenda ◽  
Farid Aiouache

The problem of current agricultural practices is not limited to land management but also to the unsustainable consumption of essential nutrients for plants, such as phosphorus. This article focuses on the valorization of wood ash and anaerobic digestate for the preparation of a slow-release fertilizer. The underlying chemistry of the blend of these two materials is elucidated by analyzing the applications of the mixture. First, the feasibility of employing low doses (≤1 g total solids (TS) ash/g TS digestate) of wood ash is explained as a way to improve the composition of the feedstock of anaerobic digestion and enhance biogas production. Secondly, a detailed description concerning high doses of wood ash and their uses in the downstream processing of the anaerobic digestate to further enhance its stability is offered. Among all the physico-chemical phenomena involved, sorption processes are meticulously depicted, since they are responsible for nutrient recovery, dewatering, and self-hardening in preparing a granular fertilizer. Simple activation procedures (e.g., carbonization, carbonation, calcination, acidification, wash, milling, and sieving) are proposed to promote immobilization of the nutrients. Due to the limited information on the combined processing of wood ash and the anaerobic digestate, transformations of similar residues are additionally considered. Considering all the possible synergies in the anaerobic digestion and the downstream stages, a dose of ash of 5 g TS ash/g TS digestate is proposed for future experiments.

2022 ◽  
Vol 14 (1) ◽  
pp. 561
George Papapolymerou ◽  
Athanasios Kokkalis ◽  
Dorothea Kasiteropoulou ◽  
Nikolaos Gougoulias ◽  
Anastasios Mpesios ◽  

The growth kinetics and the lipid and protein content of the microalgal species Chlorella sorokiniana (CS) grown heterotrophically in growth media containing glycerol and increasing amounts of anaerobic digestate (AD) equal to 0%, 15%, 30%, and 50% was studied. The effect of the AD on the fatty acid (FA) distribution of the bio-oil extracted from the CS, as well as on the fatty acid methyl ester (FAME) properties such as the saponification number (SN), the iodine value (IV), the cetane number (CN), and the higher heating value (HHV) was also estimated. The percentage of AD in the growth medium affects the rate of carbon uptake. The maximum carbon uptake rate occurs at about 30% AD. Protein and lipid content ranged from 32.3–38.4% and 18.1–23.1%, respectively. Fatty acid distribution ranged from C10 to C26. In all AD percentages the predominant fatty acids were the medium chain FA C16 to C18 constituting up to about 89% of the total FA at 0% AD and 15% AD and up to about 54% of the total FA at 30% AD and 50% AD. With respect to unsaturation, monounsaturated FA (MUFA) were predominant, up to 56%, while significant percentages, up to about 38%, of saturated FA (SFA) were also produced. The SN, IV, CN, and HHV ranged from 198.5–208.3 mg KOH/g FA, 74.5–93.1 g I/100 g FAME, 52.7–56.1, and 39.7–40.0 MJ/kg, respectively. The results showed that with increasing AD percentage, the CN values tend to increase, while decrease in IV leads to biofuel with better ignition quality.

2021 ◽  
Vol 341 ◽  
pp. 125915
Shanta Dutta ◽  
Mingjing He ◽  
Xinni Xiong ◽  
Daniel C.W. Tsang

2021 ◽  
Vol 168 ◽  
pp. 104149
Victor Moinard ◽  
Clément Redondi ◽  
Véronique Etiévant ◽  
Antoine Savoie ◽  
David Duchene ◽  

2021 ◽  
Vol 136 ◽  
pp. 143-152
Shuang Song ◽  
Jun Wei Lim ◽  
Jonathan T.E. Lee ◽  
Jia Chin Cheong ◽  
Sherilyn H. Hoy ◽  

2021 ◽  
Vol 342 ◽  
pp. 125921
Qichen Wang ◽  
Jessa Cherones ◽  
Brendan Higgins

Sign in / Sign up

Export Citation Format

Share Document