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H2O2 Production in Microbial Electrochemical Cells Fed with Primary Sludge
journal contribution
posted on 2017-05-09, 00:00 authored by Dongwon Ki, Sudeep C. Popat, Bruce E. Rittmann, César I. TorresWe
developed an energy-efficient, flat-plate, dual-chambered microbial
peroxide producing cell (MPPC) as an anaerobic energy-conversion technology
for converting primary sludge (PS) at the anode and producing hydrogen
peroxide (H2O2) at the cathode. We operated
the MPPC with a 9 day hydraulic retention time in the anode. A maximum
H2O2 concentration of ∼230 mg/L was achieved
in 6 h of batch cathode operation. This is the first demonstration
of H2O2 production using PS in an MPPC, and
the energy requirement for H2O2 production was
low (∼0.87 kWh/kg H2O2) compared to previous
studies using real wastewaters. The H2O2 gradually
decayed with time due to the diffusion of H2O2-scavenging carbonate ions from the anode. We compared the anodic
performance with a H2-producing microbial electrolysis
cell (MEC). Both cells (MEC and MPPC) achieved ∼30% Coulombic
recovery. While similar microbial communities were present in the
anode suspension and anode biofilm for the two operating modes, aerobic
bacteria were significant only on the side of the anode facing the
membrane in the MPPC. Coupled with a lack of methane production in
the MPPC, the presence of aerobic bacteria suggests that H2O2 diffusion to the anode side caused inhibition of methanogens,
which led to the decrease in chemical oxygen demand removal. Thus,
the Coulombic efficiency was ∼16% higher in the MPPC than in
the MEC (64% versus 48%, respectively).
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anode suspensionhydrogen peroxideMicrobial Electrochemical Cells Fedcarbonate ionsanode sideretention timeanode biofilmMPPCanodic performanceH 2 O 2 diffusionPSCoulombic efficiencymethane productionbatch cathode operationH 2chemical oxygen demand removalelectrolysis cellenergy requirement9 dayH 2 O 2 productionMECh 2 O 2 ProductionH 2 O 2Primary SludgeH 2 O 2 concentrationenergy-conversion technology6 h
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