In-situ caustic generation from sewage: The impact of caustic strength and sewage composition

Pikaar, Ilje, Rozendal, Renne A., Rabaey, Korneel and Yuan, Zhiguo (2013) In-situ caustic generation from sewage: The impact of caustic strength and sewage composition. Water Research, 47 15: 5828-5835. doi:10.1016/j.watres.2013.07.007

Author Pikaar, Ilje
Rozendal, Renne A.
Rabaey, Korneel
Yuan, Zhiguo
Title In-situ caustic generation from sewage: The impact of caustic strength and sewage composition
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 2013-10-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.watres.2013.07.007
Volume 47
Issue 15
Start page 5828
End page 5835
Total pages 8
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2014
Language eng
Subject 2312 Water Science and Technology
2311 Waste Management and Disposal
2310 Pollution
2302 Ecological Modelling
Abstract Periodic caustic dosage is a commonly used method by the water industry to elevate pH levels and deactivate sewer biofilms responsible for hydrogen sulfide generation. Caustic (NaOH) can be generated in-situ from sewage using a divided electrochemical cell, which avoids the need for transport, handling and storage of concentrated caustic solutions. In this study, we investigated the impact of caustic strength in the cathode compartment and the impact of sodium concentration in sewage on the Coulombic efficiency (CE) for caustic generation. The CE was found to be independent of the caustic strength produced in the range of up to ~3wt%. Results showed that a caustic solution of ~3wt% could be produced directly from sewage at a CE of up to 75±0.5%. The sodium concentration in sewage had a significant impact on the CE for caustic generation as well as on the energy requirements of the system, with a higher sodium concentration leading to a higher CE and lower energy consumption. The proton, calcium, magnesium and ammonium concentrations in sewage affected the CE for caustic generation, especially at low sodium concentrations. Economical assessment based on the experimental results indicated that sulfide control in sewers using electrochemically-generated caustic from sewage is an economically attractive strategy.
Keyword Caustic
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Advanced Water Management Centre Publications
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