Electrochemical sulfide removal by low-cost electrode materials in anaerobic digestion
By Hongjian Lin and Nicholas Williams and Amelia King and Bo Hu
Published in Chemical Engineering Journal
NULL
2016
Abstract
Hydrogen sulfide removal is usually a necessary but costly step following the anaerobic digestion (AD) in order to upgrade biogas quality. Mitigating sulfide levels of biogas and digestate simultaneously in \AD\ process will decrease the capital cost by eliminating standalone biogas upgrading facility. However, current in situ remediation methods, for instance, dosing of magnesium/sodium hydroxide, oxygen gas, iron salts, and nitrite or nitrate, potentially cause interference to biogas production and may intensively consume energy and chemicals. Here, an electrochemical remediation method was studied to use low-price electrode materials of carbon cloth and stainless steel \AISI\ 304. These electrode materials at 3 V showed a complete removal of sulfide in 2 days in synthetic media of 10 mM sulfide solution. Operating conditions for carbon cloth and stainless steel electrodes as well as major intermediates of electrochemical reactions in bench-scale digester fed with dairy manure were examined to study the performances in sulfide removal and biomethane production. Based on the results, it was concluded that carbon cloth at 2 and 3 V, and stainless steel anodes at both 1 and 2 V have a potential of significantly removing hydrogen sulfide from biogas under continuous operation given sufficient electrode surface area. Intermittent 3 V voltage application (15 minutes per day) of stainless steel can remove most biogas hydrogen sulfide. The electrochemical sulfide oxidation and removal showed no/little negative effect on biomethane production, and therefore can be a promising technology for the \AD\ industry to develop a cost-effective approach to producing sulfide free biogas.
Microsoft is Ending Support for Windows 7
Microsoft will discontinue support for Windows 7 on January 14, 2020 which means Gamry will also be discontinuing support for Windows 7. If you are upgrading to Windows 10, like many companies and institutions, you need to be running Version 7 of our s oftware . Please note that only USB and Ethernet-based instruments can run in Version 7. Eligible users can download the latest version of our software through our online Client Portal .
If you haven't already registered your instrument, you can do so through the Client Portal .
Please email Technical Support if you have any questions regarding this transition. Please be sure to include your instrument model and serial number when contacting us.