Abstract
Hydrogen sulfide (H2S) generated in sewer networks induces corrosion which today constitutes the main cause of deterioration of concrete pipes. Information regarding the H2S concentration inside sewer networks, as well as its control and reduction, has become one of the most important concerns in sanitation systems management nowadays. Modeling sulfide dynamics is the key to understanding corrosion processes. A dynamic model (called EMU-SANETSUL) was developed to calculate the H2S concentration in both the water and the gas phases of the main sewers of the city of Murcia (Spain). The model was calibrated with data from field measurements taken from both the gas phase and wastewater. Samples were taken in the network from 2016 to 2019. The model achieved an accuracy index and error index in the ranges of 57% and 15%, respectively. Empirical equations of reaction are used, and calibration parameters are detailed. The code uses an explicit discretization technique, named the Discrete Volume Element Method (DVEM). A map with the annual average concentration of H2S at the gas phase inside each pipe of the simulated network is presented. Values are compared with the mechanical deterioration inventory from closed-circuit television (CCTV) inspections performed by the Municipal Sanitation Company of the city of Murcia (EMUASA). Mechanical deterioration of pipes has diverse causes, including corrosion of pipes by H2S. Sections with high H2S concentrations that match with mechanical wear can be considered susceptible to being prioritized when rehabilitation works are being planned. Therefore, H2S concentration modeling provides valuable information for asset management of the sewer network.
Highlights
Hydrogen sulfide, H2S, is a gas generated in wastewater due to the reduction of sulfate to sulfide, as a result of the sulfate reducing bacteria (SRB) in anaerobic sewer biofilms
Hydrogen sulfide has a low solubility in water, and turbulence causes it to be released into the gas phase of the pipes at concentrations that may be harmful to people
From the simulated H2S concentrations in the gas phase inside the pipe of the main sewer network of the city of Murcia, this study provides a map showing the sections with higher sulfide concentrations
Summary
H2S, is a gas generated in wastewater due to the reduction of sulfate to sulfide, as a result of the sulfate reducing bacteria (SRB) in anaerobic sewer biofilms. Hydrogen sulfide has a low solubility in water, and turbulence causes it to be released into the gas phase of the pipes at concentrations that may be harmful to people. 22ooff1199 turbulence causes it to be released into the gas phase of the pipes at concentrations that may be whoarrkminfuglitnotpheeospelwe awgoerskyinstgeminst.hIensaedwdaitgioens,ytshteismgsa.sIncaaudsdesitisoignn, itfihcisangtacsocmaupsleasinstisgnofifbicaadnot dcoomrspwlahinents iot frebaachdeos dstorresetwlehveenl. .(a()aV) iVewiewof othfethdeegdreagdraatidoantioofna osefwaesreiwn eCroirnreCdeorrareSdtreereat iSntrteheettoinwtnhoeftJoawvanlíoNfuJeavvoal(íMNuurceivao, S(pMauinr)c.ia(b, S) pDaeitna)i.l(obf)dDeegtraaidl oefddpeigpreabdecdapuispeeobf ethcaeuascetioofnthoef hacytdiorongoefnhsyudlfirodgee(nHs2uSl)fipdreo(pHo2sSe)dpirnopOodsoerd aindOCdoorrroasnidonCCorornotsrioolninCSoanntritoalriynSSeawneitraargyeSSeywsteermagseaSnydstTermeastmanedntTPrleaantmts:enDtePsilgantMs: aDneusaigl n[2M]. Hydrogen sulfide generated in the sewer networks induces corrosion, which is the main cause of deteriHoryadtriongeonf scuonlfcidreetegepnipereastetoddianyth[1e,6s,e7w]. S(uEcMhUinAfoSrAm),atmionapis uasreed pinretphearperdocbeasseodf porniorCitCizTinVg pinipspeleincteiornens eowfalth(Feigpuirpee2s).where mechanical deteMrioercahtaionnicaisl doebtseerrivoeradt.ioSnucrhefeinrsfotormthaetiloonssisofuwseadllitnhitchkenepsrso,cdeusse otof bpiroicohrietmizicnagl cpoiprreolsinioenr,etnoeawnayl c(rFaicgkutrhea2t)c.ould be due to external traffic load or any other cause of deterioration that could be observed thorough visual inspection
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