Feasibility of spent metalworking fluids as co-substrate for anaerobic co-digestion

Ivan Rodriguez-Verde; Leticia Regueiro; Rocio Pena; Juan A Álvarez; Juan M Lema; Marta Carballa

doi:10.1016/j.biortech.2013.12.090

Feasibility of spent metalworking fluids as co-substrate for anaerobic co-digestion

Bioresour Technol. 2014 Mar:155:281-8. doi: 10.1016/j.biortech.2013.12.090. Epub 2013 Dec 28.

Authors

Ivan Rodriguez-Verde¹, Leticia Regueiro², Rocio Pena³, Juan A Álvarez⁴, Juan M Lema⁵, Marta Carballa⁶

Affiliations

¹ Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E- 15782 Santiago de Compostela, Spain. Electronic address: ivan.rodriguez@usc.es.
² 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.
³ AIMEN Technological Centre, C/Relva, 27A - Torneiros, E-36410, Porriño, Pontevedra, Spain. Electronic address: rpena@aimen.es.
⁴ AIMEN Technological Centre, C/Relva, 27A - Torneiros, E-36410, Porriño, Pontevedra, Spain. Electronic address: jaalvarez@aimen.es.
⁵ Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E- 15782 Santiago de Compostela, Spain. Electronic address: juan.lema@usc.es.
⁶ Department of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E- 15782 Santiago de Compostela, Spain. Electronic address: marta.carballa@usc.es.

PMID: 24457301
DOI: 10.1016/j.biortech.2013.12.090

Abstract

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.

Keywords: Biomethanation; Feeding strategy; Pig manure; Pulse; Spent metal cutting fluids.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Anaerobiosis
Archaea / metabolism*
Biological Oxygen Demand Analysis
Bioreactors*
Chromatography, Gas
Denaturing Gradient Gel Electrophoresis
Metallurgy*
Methane / biosynthesis*
Pseudomonas / metabolism*
Waste Disposal, Fluid / methods*
Waste Products / analysis*

Substances

Waste Products
Methane