MITIGATION OF HYDROGEN SULFIDE CONCENTRATION IN SEWER PIPE BY USING CONDUCTIVE CONCRETE

Abstract

 The objective of this study was to develop a new technology to mitigate the concentration of hydrogen sulfide in sewer pipe by using conductive concrete. Experimental results showed that the concentration of hydrogen sulfide significantly decreased by using conductive concrete, and the effectiveness lasted during 66 days experiment. Also found was that elemental sulfur was observed after 66 days experiment in sludge for conductive concrete, whereas this tread was not observed for ordinary Portland cement. These results demonstrated that conductive concrete provides an electron pathway from deposited sludge in the bottom of sewer pipe to oxygen dissolved in surface water and as a result, the electron generated from hydrogen sulfide oxidation in anaerobic environment was accepted by oxygen via conductive concrete. Finally, regarding the mechanism responsible for hydrogen sulfide oxidation, chemical oxidation was the dominant process and biological process did not play a siginificant role.