Constructed wetland | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-06

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Constructed_wetland


00:00:05 1 Terminology
00:00:11 2 Overview
00:00:17 3 Removal of contaminants
00:00:23 3.1 Nitrogen removal
00:00:29 3.1.1 Nitrification
00:00:34 3.1.2 Denitrification
00:00:40 3.1.3 Ammonia removal from mine water
00:00:46 3.2 Phosphorus removal
00:00:52 3.2.1 Biomass plants incorporation
00:00:58 3.3 Metals removal
00:01:03 3.3.1 Mine water—Acid drainage removal
00:01:09 3.4 Pathogen removal
00:01:15 4 Types and design considerations
00:01:21 4.1 Subsurface flow
00:01:27 4.1.1 Applications
00:01:32 4.1.2 Design considerations
00:01:38 4.1.3 Operation and maintenance
00:01:44 4.1.4 Comparisons with other types
00:01:50 4.1.5 Costs
00:01:56 4.2 Surface flow
00:02:01 4.3 Hybrid systems
00:02:07 4.4 Others
00:02:13 4.4.1 Integrated constructed wetland
00:02:19 5 Plants and other organisms
00:02:22 5.1 Plants
00:02:28 5.2 Animals
00:02:31 6 Costs
00:02:36 7 History
00:02:42 8 Examples
00:02:48 8.1 Austria
00:02:54 8.2 United States of America
00:02:57 8.3 Australia
00:03:02 9 See also
00:03:08 10 References



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SUMMARY
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A constructed wetland (CW) is an artificial wetland to treat municipal or industrial wastewater, greywater or stormwater runoff. It may also be designed for land reclamation after mining, or as a mitigation step for natural areas lost to land development.
Constructed wetlands are engineered systems that use natural functions vegetation, soil, and organisms to treat wastewater. Depending on the type of wastewater the design of the constructed wetland has to be adjusted accordingly. Constructed wetlands have been used to treat both centralized and on-site wastewater. Primary treatment is recommended when there is a large amount of suspended solids or soluble organic matter (measured as BOD and COD).Similarly to natural wetlands, constructed wetlands also act as a biofilter and/or can remove a range of pollutants (such as organic matter, nutrients, pathogens, heavy metals) from the water. Constructed wetlands are a sanitation technology that have not been designed specifically for pathogen removal, but instead, have been designed to remove other water quality constituents such as suspended solids, organic matter and nutrients (nitrogen and phosphorus). All types of pathogens (i.e., bacteria, viruses, protozoan and helminths) are expected to be removed to some extent in a constructed wetland. Subsurface wetland provide greater pathogen removal than surface wetlands.There are two main types of constructed wetlands: subsurface flow and surface flow constructed wetlands. The planted vegetation plays an important role in contaminant removal. The filter bed, consisting usually of sand and gravel, has an equally important role to play. Some constructed wetlands may also serve as a habitat for native and migratory wildlife, although that is not their main purpose. Subsurface flow constructed wetlands are designed to have either horizontal flow or vertical flow of water through the gravel and sand bed. Vertical flow systems have a smaller space requirement than horizontal flow systems.