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dc.contributor.authorRugaika, Anita
dc.contributor.authorKajunguri, Damian
dc.contributor.authorDeun, Rob
dc.contributor.authorBruggen, Bart
dc.contributor.authorNjau, Karoli
dc.date.accessioned2023-10-05T07:37:17Z
dc.date.available2023-10-05T07:37:17Z
dc.date.issued2018-11-29
dc.identifier.urihttps://doi.org/10.2166/wst.2019.031
dc.identifier.urihttps://dspace.nm-aist.ac.tz/handle/20.500.12479/2120
dc.descriptionThis research article was published in Water Science and Technology Journal, Volume 78, Issue 12, 2018.en_US
dc.description.abstractPilot-scale constructed wetlands (CWs) that allowed wastewater to flow with high interstitial velocities in a controlled environment were used to evaluate the possibility of using mass transfer approach to design horizontal subsurface flow constructed wetlands (HSSF-CWs) treating waste stabilisation ponds (WSPs) effluent. Since CW design considers temperature which is irrelevant in tropics, mass transfer approach could improve the design. HSSF-CWs were operated in batch recycle mode as continuous stirred tank reactors (CSTR) at different interstitial velocities. The overall removal rate constants of chemical oxygen demand (COD) at various interstitial velocities were evaluated in mesocosms that received pretreated domestic wastewater. The mean overall removal rate constants were 0.43, 0.69, 0.74 and 0.73 d−1 corresponding to interstitial velocities of 15.43, 36, 56.57 and 72 md−1, respectively. Results showed that the interstitial velocities up to 36 md−1 represented a range where mass transfer effect was significant and, above it, insignificant to the COD removal process. Since WSPs effluent has high flow rates and low organic load, it is possible to induce high interstitial velocities in a HSSF-CW treating this effluent, without clogging and overflow. The performance of these HSSF for tertiary treatment in tropical areas could be improved by considering flow velocity when designing.en_US
dc.language.isoenen_US
dc.publisherIWA Publishingen_US
dc.subjectChemical oxygen demanden_US
dc.subjectHorizontal subsurface flow constructed wetlanden_US
dc.subjectInterstitial velocityen_US
dc.subjectMass transferen_US
dc.subjectRemoval rate constanten_US
dc.subjectWaste stabilisation ponden_US
dc.titleMass transfer approach and the designing of horizontal subsurface flow constructed wetland systems treating waste stabilisation pond effluenten_US
dc.typeArticleen_US


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