Feasibility of spent metalworking fluids as co-substrate for anaerobic co-digestion.
In this paper, anaerobic co-digestion of spent metalworking fluids (SMWF) and pig manure (PM) was evaluated. Three SMWF:PM ratios were tested in order to find the highest process efficiency. The best results (COD removal efficiencies of 74%) were achieved co-digesting a mixture with a SMWF:PM ratio of 1:99, w/w(1) (corresponding to 3.75mL SMWF/Lreactor week), which indicates that SMWF did not affect negatively PM degradation. Furthermore, two different weekly SMWF pulse-frequencies were performed (one reactor received 1 pulse of 3.75mL/Lreactor and the other 3 pulses of 1.25mL/Lreactor) and no differences in COD removal efficiency were observed. Microbiology analysis confirmed that Pseudomonas was the predominant genus when treating anaerobically SMWF and the presence of a higher fraction of Archaea was indicative of good digester performance. This study confirms the feasibility of anaerobic co-digestion as an appropriate technology for treating and valorising SMWF.
Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E- 15782 Santiago de Compostela, Spain. Electronic address: ivan.rodriguez@usc.es.
Ivan
I
Rodriguez-Verde
Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E- 15782 Santiago de Compostela, Spain. Electronic address: leticia.regueiro.abelleira@gmail.com.
Leticia
L
Regueiro
AIMEN Technological Centre, C/Relva, 27A - Torneiros, E-36410, Porriño, Pontevedra, Spain. Electronic address: rpena@aimen.es.
Rocio
R
Pena
AIMEN Technological Centre, C/Relva, 27A - Torneiros, E-36410, Porriño, Pontevedra, Spain. Electronic address: jaalvarez@aimen.es.
Juan A
JA
Álvarez
Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E- 15782 Santiago de Compostela, Spain. Electronic address: juan.lema@usc.es.
Juan M
JM
Lema
Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E- 15782 Santiago de Compostela, Spain. Electronic address: marta.carballa@usc.es.
Marta
M
Carballa
D000693:Anaerobiosis; D001105:Archaea / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002849:Chromatography, Gas; D058645:Denaturing Gradient Gel Electrophoresis; D008669:Metallurgy; D008697:Methane / Q000096:biosynthesis*; D011549:Pseudomonas / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014866:Waste Products / Q000032:analysis*
D014866:Waste Products; D008697:Methane
Biomethanation; Feeding strategy; Pig manure; Pulse; Spent metal cutting fluids