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Constructed Wetlands and Wastewater Treatment

Constructed Wetlands and Wastewater Treatment. Scott Stine SWES 574. Types 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

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Constructed Wetlands and Wastewater Treatment

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  1. Constructed Wetlands and Wastewater Treatment Scott Stine SWES 574

  2. Types 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 used

  3. Wastewater Treatment Uses • Additional Secondary Treatment • Tertiary Treatment • Onsite Wastewater Treatment • alternative to municipal sewage treatment • used in animal feeding operations

  4. Microorganisms • Bacteria • Coliforms, Enterococci, C. perfringens • Viruses • Coliphage • Parasites • Cryptosporidium, Giardia

  5. Removal Processes • Most processes are enhanced by vegetation • Processes include: • Filtration • Adsorption • Predation • UV light • Sedimentation

  6. SSF 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 mosquitoes

  7. Concerns • Some bacteria are able to reproduce on some plant surfaces • Enterococci • Spore forming pathogens may be released by precipitation • Cryptosporidium • Giardia

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