Abstract
This paper is intended to conduct a narrative review on the acid corrosion of sewer tunnel concrete in the City of Edmonton—an investigation on the MIC (microbially induced corrosion) mechanism and the potential control methods to improve the sustainability of concrete. Firstly, three categories of main influencing factors were identified for the rate of MIC: hydraulic parameters, environmental factors, and concrete mixture design. Secondly, it is found that the sewer tunnel design plays an essential role in the control of the MIC. Building on that, a review was conducted on eight municipal drainage design standards in consideration of the MIC, indicating a lack of design standards of the flow velocity and pipe material. Finally, an investigation was done for cement-based rehabilitating techniques and materials.
Highlights
In sewer systems, when hydrogen sulfide gas (H2S) emitted from sewage meets condensing moisture, the process can form sulfuric acid (H2SO4) that corrodes the concrete in sewer tunnel rapidly [1,2]
Many chemicals dosed to the sewage have been effective in reducing sulfide concentrations in sewage
Studies reviewed for this paper showed that the cast-in-place method is seldom used in sewer Sretuhadbiielsitarteivonie. wAerdecfeonrt tlihteisraptuarpeerrevshieowwredvetahleadt tohnelyctawsto-idno-cpulmaceenmts e[6t8h,o72d] isndseicladtoinmg suuscehdaiunsseewer rehaboiflitthaeticoanst.-Ain-rpelcaecentmleittehroadt.uProesrseibvlieerwearseovnesathleadt tohnislymtewthooddoiscnuomt wenidtsel[y68u,s7e2d] ainredtihcaattiint rgeqsuuicrhesa use of theexctaesnts-iivne-pfloarcmewmoerkthaondd
Summary
In sewer systems, when hydrogen sulfide gas (H2S) emitted from sewage meets condensing moisture, the process can form sulfuric acid (H2SO4) that corrodes the concrete in sewer tunnel rapidly [1,2]. This paper is intended to conduct a narrative review on the acid corrosion of sewer tunnel concrete in the COE. It aims to provide a preliminary investigation of the MIC mechanism and recommendations on how to mitigate MIC issues in Edmonton concerning drainage design, corrosion control methods, rehabilitation techniques, and materials. This paper is intended to conduct a narrative review on the acid corrosion of sewer Susttauinnanbieliltyco2n01c8r,e1te0,i5n1t7he COE It aims to provide a preliminary investigation of the MIC mechanism and 3 of 24 recommendations on how to mitigate MIC issues in Edmonton concerning drainage design, corrosion 2.
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