A two-stage microbial fuel cell and anaerobic fluidized bed membrane bioreactor (MFC-AFMBR) system for effective domestic wastewater treatment.

License
http://pubs.acs.org/page/policy/authorchoice_termsofuse.html

Type
Article

Authors
Ren, Lijiao
Ahn, Yongtae
Logan, Bruce E

KAUST Grant Number
KUS-I1-003-13

Online Publication Date
2014-03-10

Print Publication Date
2014-04

Date
2014-03-10

Abstract
Microbial fuel cells (MFCs) are a promising technology for energy-efficient domestic wastewater treatment, but the effluent quality has typically not been sufficient for discharge without further treatment. A two-stage laboratory-scale combined treatment process, consisting of microbial fuel cells and an anaerobic fluidized bed membrane bioreactor (MFC-AFMBR), was examined here to produce high quality effluent with minimal energy demands. The combined system was operated continuously for 50 days at room temperature (∼25 °C) with domestic wastewater having a total chemical oxygen demand (tCOD) of 210 ± 11 mg/L. At a combined hydraulic retention time (HRT) for both processes of 9 h, the effluent tCOD was reduced to 16 ± 3 mg/L (92.5% removal), and there was nearly complete removal of total suspended solids (TSS; from 45 ± 10 mg/L to <1 mg/L). The AFMBR was operated at a constant high permeate flux of 16 L/m(2)/h over 50 days, without the need or use of any membrane cleaning or backwashing. Total electrical energy required for the operation of the MFC-AFMBR system was 0.0186 kWh/m(3), which was slightly less than the electrical energy produced by the MFCs (0.0197 kWh/m(3)). The energy in the methane produced in the AFMBR was comparatively negligible (0.005 kWh/m(3)). These results show that a combined MFC-AFMBR system could be used to effectively treat domestic primary effluent at ambient temperatures, producing high effluent quality with low energy requirements.

Citation
Ren L, Ahn Y, Logan BE (2014) A Two-Stage Microbial Fuel Cell and Anaerobic Fluidized Bed Membrane Bioreactor (MFC-AFMBR) System for Effective Domestic Wastewater Treatment. Environ Sci Technol 48: 4199–4206. Available: http://dx.doi.org/10.1021/es500737m.

Acknowledgements
We thank David Jones for help with the analytical measurements, Dr. Xiaoyuan Zhang for preparing the photo of the two-stage MFCs-AFMBR system, and KOLON Inc.(South Korea) for providing hollow-fiber membranes for this research. This research is supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology(KAUST).

Publisher
American Chemical Society (ACS)

Journal
Environmental Science & Technology

DOI
10.1021/es500737m

PubMed ID
24568605

PubMed Central ID
PMC3979089

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