Jump to main content
Jump to site search

Issue 9, 2014
Previous Article Next Article

Electrochemical treatment of human waste coupled with molecular hydrogen production

Author affiliations

Abstract

We have developed a wastewater treatment system that incorporates an electrolysis cell for on-site wastewater treatment coupled with molecular hydrogen production for use in a hydrogen fuel cell. Herein, we report on the efficacy of a laboratory-scale wastewater electrolysis cell (WEC) using real human waste for the first time with semiconductor electrode utilizing a mixed particle coating of bismuth oxide doped titanium dioxide (BiOx/TiO2). A comprehensive environmental analysis has been coupled together with a robust kinetic model under the chemical reaction limited regime to investigate the role of various redox reactions mediated by chloride present in human waste. The oxidative elimination of the chemical oxygen demand (COD) and ammonium ion can be modelled using empirical, pseudo-first-order rate constants and current efficiencies (CE). In combination with an anaerobic pre-treatment step, human waste containing high-levels of COD, protein, and color are eliminated within 6 hours of batch treatment in the WEC. The reactor effluent has a residual inorganic total nitrogen (TN) concentration of ∼40 mM. The CE and specific energy consumption were 8.5% and 200 kWh per kgCOD for the COD removal, 11% and 260 for kWh per kgTN for the TN conversion. The CE and energy efficiencies (EE) for hydrogen production were calculated to be 90% and 25%, respectively.

Graphical abstract: Electrochemical treatment of human waste coupled with molecular hydrogen production

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 Sep 2013, accepted on 26 Nov 2013 and first published on 29 Nov 2013


Article type: Paper
DOI: 10.1039/C3RA46699J
RSC Adv., 2014,4, 4596-4608

  •   Request permissions

    Electrochemical treatment of human waste coupled with molecular hydrogen production

    K. Cho, D. Kwon and M. R. Hoffmann, RSC Adv., 2014, 4, 4596
    DOI: 10.1039/C3RA46699J

Search articles by author

Spotlight

Advertisements