Trace metals supplementation in anaerobic membrane bioreactors treating highly saline phenolic wastewater.
Biomass requires trace metals (TM) for maintaining its growth and activity. This study aimed to determine the effect of TM supplementation and partitioning on the specific methanogenic activity (SMA), with a focus on cobalt and tungsten, during the start-up of two lab-scale Anaerobic Membrane Bioreactors (AnMBRs) treating saline phenolic wastewater. The TM partitioning revealed a strong accumulation of sodium in the biomass matrix and a wash-out of the majority of TM in the reactors, which led to an SMA decrease and a low COD removal of about 30%. The SMA exhibits a maximum at about 6g Na+L-1and nearly complete inhibition at 34g Na+L-1. The dose of 0.5mgL-1of tungsten increases the SMA by 17%, but no improvement was observed with the addition of cobalt. The results suggested that TM were not bioavailable at high salinity. Accordingly, an increased COD removal was achieved by doubling the supply of TM.
Section Sanitary Engineering, Department of Water Management, Delft University of Technology, Stevinweg 1, 2628CN Delft, The Netherlands. Electronic address: J.D.MunozSierra@tudelft.nl.
Julian David
JD
Muñoz Sierra
Section Sanitary Engineering, Department of Water Management, Delft University of Technology, Stevinweg 1, 2628CN Delft, The Netherlands; Research Group GI(2)AM, Department of Chemical Engineering, University of Valencia, Avda. Universitat s/n, 46100 Burjassot, Spain.
Carlos
C
Lafita
Research Group GI(2)AM, Department of Chemical Engineering, University of Valencia, Avda. Universitat s/n, 46100 Burjassot, Spain.
Carmen
C
Gabaldón
Section Sanitary Engineering, Department of Water Management, Delft University of Technology, Stevinweg 1, 2628CN Delft, The Netherlands.
Henri
H
Spanjers
Section Sanitary Engineering, Department of Water Management, Delft University of Technology, Stevinweg 1, 2628CN Delft, The Netherlands.
Jules B
JB
van Lier
D000693:Anaerobiosis; D001421:Bacteria, Anaerobic; D019149:Bioreactors; D008670:Metals; D008697:Methane; D014865:Waste Disposal, Fluid; D062065:Wastewater
D008670:Metals; D008697:Methane; D062065:Wastewater
Anaerobic Membrane Bioreactor; Methanogenic activity; Phenol; Sodium; Trace metals partitioning