Biostimulation of food waste anaerobic digestion supplemented with granular activated carbon, biochar and magnetite: A comparative analysis

被引:37
作者
Altamirano-Corona, Maria F. [1 ]
Anaya-Reza, Omar [1 ]
Duran-Moreno, Alfonso [1 ]
机构
[1] Univ Nacl Autonoma Mexico, Fac Chem, Chem Engn Dept, Circuito Invest Cient, Mexico City 04510, DF, Mexico
关键词
Anaerobic digestion; Granular activated carbon; Biochar; Magnetite; Biostimulation; Food waste; INTERSPECIES ELECTRON-TRANSFER; COMPLEX ORGANIC WASTE; METHANE PRODUCTION; SYNTROPHIC METABOLISM; PERFORMANCE; SOIL; COLONIZATION; COMMUNITIES; PROPIONATE; CHALLENGES;
D O I
10.1016/j.biombioe.2021.106105
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
The biostimulant effect of three conductive materials in anaerobic digestion (AD) of food waste (FW) was investigated. These materials included granular activated carbon (GAC) and biochar (BC) (10, 5 and 1 g/L) and magnetite (Fe3O4) (1, 0.5, 0.1 g/L). All three materials have physicochemical properties that enhance AD process. The favorable features include a basic character that improves the buffering capacity of the system and avoids inhibitions due to VFA accumulation, a suitable morphology for the colonization by microorganisms and the formation of biofilms. Conductive materials (CM) also have surfaces with alkaline and alkaline earth metals (mainly K+, Na+, Mg2+ and Ca2+) which provide trace elements and could cause CO2 carbonation due to the effect of metal oxides. In addition, carbonaceous materials (GAC and BC) possess quinone groups that have a suggestive redox activity to enhancing direct interspecies electron transfer (DIET). Experimental tests, modified Gompertz model and statistical analysis show that the increase in biogas production is not exclusively attributed to the microorganisms using the materials as immobilizing matrix and although electrical conductivity is important, it is not the determining factor of the improvement, since the increase in yield is not directly proportional to the value of this parameter. The materials and doses with the best results were Fe3O4 0.1 g/L and BC 1 g/L with an increase in methane yield of 30.1% and 20.3%, respectively. In the range of doses analyzed, all three materials share that at lower doses, methane production is higher.
引用
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页数:11
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