Anaerobic Digestion Performance in the Energy Recovery of Kiwi Residues

World Multidisciplinary Earth Sciences Symposium 2017

Martins, Ramiro^1,2 ; Boaventura, Rui^2 ; Paulista, Larissa^3

Department of Chemical and Biological Technology of ESTiG, Polytechnic Institute of Braganca, Campus de Santa Apolónia, Braganca

5300-253, Portugal^1

Laboratory LSRE-LCM, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, Porto

4200-465, Portugal^2

ESA, Polytechnic Institute of Braganca, Campus Santa Apolónia, Braganca

5300-253, Portugal^3

关键词: Agro-industrial residue;    Anaerobic digestion process;    Control and monitor;    Different substrates;    Digestion performance;    Mesophilic condition;    Operational factors;    Wastewater treatment plants;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/4/042044/pdf
DOI  :  10.1088/1755-1315/95/4/042044

来源: IOP

【 摘 要 】

World production and trade of fruits generate losses in the harvest, post-harvest, handling, distribution and consumption phases, corresponding to 6.8% of total production. These residues present high potential as a substrate for the anaerobic digestion process and biogas generation. Thus, the energy valuation of the agro-industrial residues of kiwi production was evaluated by anaerobic digestion, aiming at optimizing the biogas production and its quality. Ten assays were carried out in a batch reactor (500 mL) under mesophilic conditions and varying a number of operational factors: different substrate/inoculum ratios; four distinct values for C: N ratio; inoculum from different digesters; and inoculum collected at different times of the year. The following parameters were used to control and monitor the process: pH, alkalinity, volatile fatty acids (VFA), volatile solids (VS) and chemical oxygen demand (COD). Among the tests performed, the best result obtained for the biogas production corresponded to the use of 2 g of substrate and 98 mL of inoculum of the anaerobic digester of the Wastewater Treatment Plant (WWTP) of Braganca, with addition of 150 mg of bicarbonate leading to a production of 1628 L biogas.kg-1VS (57% methane). In relation to the biogas quality, the best result was obtained with 20 g of substrate and 380 mL of inoculum from the anaerobic digester sludge of WWTP of Ave (with addition 600 mg of sodium bicarbonate), presenting a value of 85% of CH4, with a production of 464 L biogas.kg-1VS.