UA SWES 574 - Constructed Wetlands and Wastewater Treatment

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Constructed Wetlands and Wastewater TreatmentTypes of Constructed WetlandsWastewater Treatment UsesMicroorganismsRemoval ProcessesSSF vs. SFConcernsSlide 8Constructed Wetlands and Wastewater TreatmentScott StineSWES 574Types of Constructed WetlandsSurface Flow Wetlands (SF)–similar to natural wetlands–free floating, emergent, and submerged plants are usedSubsurface Flow Wetlands (SSF)–water flows below surface of support media–emergent plants that are tolerant of water saturated soils are usedWastewater Treatment UsesAdditional Secondary TreatmentTertiary TreatmentOnsite Wastewater Treatment–alternative to municipal sewage treatment–used in animal feeding operationsMicroorganismsBacteria–Coliforms, Enterococci, C. perfringensViruses–ColiphageParasites–Cryptosporidium, GiardiaRemoval ProcessesMost processes are enhanced by vegetationProcesses include:–Filtration–Adsorption –Predation –UV light –SedimentationSSF vs. SFWhat are the objectives of the constructed wetland?Some considerations:–SSF remove pathogens more efficiently than SF–SF allow more biodiversity and habitats –SSF minimize pests such as mosquitoesConcernsSome bacteria are able to reproduce on some plant surfaces–EnterococciSpore forming pathogens may be released by


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UA SWES 574 - Constructed Wetlands and Wastewater Treatment

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