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Electrochemical disinfection of toilet wastewater using wastewater electrolysis cell

Huang, Xiao and Qu, Yan and Cid, Clément A. and Finke, Cody and Hoffmann, Michael R. and Lim, Keahying and Jiang, Sunny C. (2016) Electrochemical disinfection of toilet wastewater using wastewater electrolysis cell. Water Research, 92 . pp. 164-172. ISSN 0043-1354 . PMCID PMC4773403. http://resolver.caltech.edu/CaltechAUTHORS:20160216-112228737

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Abstract

The paucity of proper sanitation facilities has contributed to the spread of waterborne diseases in many developing countries. The primary goal of this study was to demonstrate the feasibility of using a wastewater electrolysis cell (WEC) for toilet wastewater disinfection. The treated wastewater was designed to reuse for toilet flushing and agricultural irrigation. Laboratory-scale electrochemical (EC) disinfection experiments were performed to investigate the disinfection efficiency of the WEC with four seeded microorganisms (Escherichia coli, Enterococcus, recombinant adenovirus serotype 5, and bacteriophage MS2). In addition, the formation of organic disinfection byproducts (DBPs) trihalomethanes (THMs) and haloacetic acids (HAA_5) at the end of the EC treatment was also investigated. The results showed that at an applied cell voltage of +4 V, the WEC achieved 5-log_(10) reductions of all four seeded microorganisms in real toilet wastewater within 60 min. In contrast, chemical chlorination (CC) disinfection using hypochlorite [NaClO] was only effective for the inactivation of bacteria. Due to the rapid formation of chloramines, less than 0.5-log_(10) reduction of MS2 was observed in toilet wastewater even at the highest [NaClO] dosage (36 mg/L, as Cl_2) over a 1 h reaction. Experiments using laboratory model waters showed that free reactive chlorine generated in situ during EC disinfection process was the main disinfectant responsible for the inactivation of microorganisms. However, the production of hydroxyl radicals [ OH], and other reactive oxygen species by the active bismuth-doped TiO_2 anode were negligible under the same electrolytic conditions. The formation of THMs and HAA_5 were found to increase with higher applied cell voltage. Based on the energy consumption estimates, the WEC system can be operated using solar energy stored in a DC battery as the sole power source.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.watres.2016.01.040DOIArticle
http://www.sciencedirect.com/science/article/pii/S0043135416300392PublisherArticle
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4773403/PubMed CentralArticle
ORCID:
AuthorORCID
Cid, Clément A.0000-0002-7293-035X
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) Received 30 August 2015; Received in revised form 8 January 2016; Accepted 19 January 2016; Available online 21 January 2016. This work was supported by the Bill and Melinda Gates Foundation OPP 1069500 and OPP 1111246. Graduate Fellowship support to X. Huang and K. Lim was provided by the U.S. National Science Foundation Partnerships for International Research and Education (OISE-1243543).
Funders:
Funding AgencyGrant Number
Bill and Melinda Gates FoundationOPP 1069500
Bill and Melinda Gates FoundationOPP 1111246
NSFOISE-1243543
Subject Keywords:Electrochemical disinfection; Toilet wastewater; Wastewater electrolysis cell; Microbial pathogens; Disinfection byproducts; Solar energy
PubMed Central ID:PMC4773403
Record Number:CaltechAUTHORS:20160216-112228737
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160216-112228737
Official Citation:Xiao Huang, Yan Qu, Clément A. Cid, Cody Finke, Michael R. Hoffmann, Keahying Lim, Sunny C. Jiang, Electrochemical disinfection of toilet wastewater using wastewater electrolysis cell, Water Research, Volume 92, 1 April 2016, Pages 164-172, ISSN 0043-1354, http://dx.doi.org/10.1016/j.watres.2016.01.040. (http://www.sciencedirect.com/science/article/pii/S0043135416300392)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64504
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Feb 2016 21:58
Last Modified:15 Sep 2017 22:34

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