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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Constructed wetland | 5/5 | https://en.wikipedia.org/wiki/Constructed_wetland | reference | science, encyclopedia | 2026-05-05T07:17:43.561117+00:00 | kb-cron |
== History == Primary clarifier effluent was discharged directly to natural wetlands for decades before environmental regulations discouraged the practice. Subsurface flow constructed wetlands with sand filter beds have their origin in China and are now used in Asia in small cities.
== Examples ==
=== Austria === The total number of constructed wetlands in Austria is 5,450 (in 2015). Due to legal requirements (nitrification), only vertical flow constructed wetlands are implemented in Austria as they achieve better nitrification performance than horizontal flow constructed wetlands. Only about 100 of these constructed wetlands have a design size of 50 population equivalents or more. The remaining 5,350 treatment plants are smaller than that.
=== Canada === As part of the remediation efforts to remove contamination from CFB Goose Bay, one of the waste dumps was transformed into an engineered wetland. In 2023, Clearwater County implemented the first biofilter-based wetland wastewater treatment system in the province. The system uses 2 types of subsurface constructed wetlands to conduct both aerobic and anaerobic wastewater treatment.
== See also ==
== References ==
== External links ==
Constructed Wetlands – US Environmental Protection Agency — Handbook, studies and related resources Publications on constructed wetlands in the library of the Sustainable Sanitation Alliance