Methanogenic and fertilizing potential of aquaculture waste: towards freshwater farms energy self‐sufficiency in the framework of blue growth

Type Article
Date 2020-08
Language English
Author(s) Ndiaye Ndeye Aida1, 2, Maiguizo-Diagne Halima1, Diadhiou Hamet Diaw3, Ndiaye Waly Ndianco3, 4, Diedhiou Fulgence3, Cournac Laurent2, 5, Gaye Mohamed Lamine6, Fall Saliou1, Brehmer Patrice3, 7
Affiliation(s) 1 : LCM ‐ LAPSE Institut Sénégalais de Recherches Agricoles (ISRA) Dakar , Senegal
2 : LMI IESOL LEMSAT ,Centre IRD‐ISRA‐UCAD Bel Air Dakar , Senegal
3 : Dakar‐Thiaroye Oceanographic Research Center (CRODT) ,ISRA Research Center of Hann (PRH) Institut Sénégalais de Recherches Agricoles (ISRA) Dakar ,Senegal
4 : Département Sciences Animales ,Faculté des sciences de l’agriculture et de l’alimentation Université Laval Québec ,Canada
5 : Eco&Sols IRD CIRAD INRA Montpellier Supagro Univ Montpellier Montpellier, France
6 : Department of Chemistry, University Cheikh Anta DIOP (UCAD) Dakar, Senegal
7 : IRD, Univ Brest CNRS Ifremer IUEM‐Lemar Plouzané , France
Source Reviews In Aquaculture (1753-5123) (Wiley), 2020-08 , Vol. 12 , N. 3 , P. 1435-1444
DOI 10.1111/raq.12390
WOS© Times Cited 2
Keyword(s) biogas, digests, energy recovery, fish faeces, methanation, sustainable science
Abstract

he fisheries sector, particularly aquaculture, is a fundamental source of nutrition for humans, particularly in developing countries. The modern development of fish farming requires energy for production systems. This study investigates the potential of using organic wastes derived from fish fattening to produce on‐farm energy through the process of methanization. Oreochromis niloticus faeces methanogen potential was determined with (IFF) and without (UIFF) methanizer microbial inoculum. At the end of the manure methanation trials, the resulting digestates were tested as organic fertilizers for agriculture. The tests showed that inoculated fish faeces had faster biogas kinetics production compared with uninoculated fish faeces. In both cases, the produced biogas contained more than 60% methane (CH4) from the second week of incubation, indicating that it was of good quality. Furthermore, the total CH4 volume was twice as larger in IFF compared with UIFF. Biofertilizer tests showed no significant differences for most of the growth parameters in onion and tomato when compared to the unfertilized control, except in one case for tomato plants, which significantly increased its aboveground biomass. The results show that fish faeces are good methanogenic substrates conducive to energy recovery that could facilitate farm autonomy; however, valorization of the digestates as biofertilizer still requires extensive agronomic optimization. Based on our results, we estimate that equivalents of energy need of almost ten millions of people could be covered using the aquaculture potential in freshwater fish faeces biogas worldwide or that at least aquaculture farm energy self‐sufficiency could be fostered.

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Ndiaye Ndeye Aida, Maiguizo-Diagne Halima, Diadhiou Hamet Diaw, Ndiaye Waly Ndianco, Diedhiou Fulgence, Cournac Laurent, Gaye Mohamed Lamine, Fall Saliou, Brehmer Patrice (2020). Methanogenic and fertilizing potential of aquaculture waste: towards freshwater farms energy self‐sufficiency in the framework of blue growth. Reviews In Aquaculture, 12(3), 1435-1444. Publisher's official version : https://doi.org/10.1111/raq.12390 , Open Access version : https://archimer.ifremer.fr/doc/00588/70033/