Question

What is wetland construction?

Answer 1

A constructed wetland uses natural geochemical and biological processes in a wetland ecosystem to treat metals, explosives, and other contaminants in groundwater. Usually, the constructed wetland has three primary components: an impermeable layer (generally clay), a gravel layer that provides a substrate (i.e., an area that provides nutrients and support) for the root zone, and an above-surface vegetation zone. The impermeable layer prevents infiltration of wastes down into lower aquifers. The gravel layer and root zone is where water flows and bioremediation and denitrification take place. The above ground vegetative layer contains the plant material. Both aerobic and anaerobic systems (i.e., systems with and without oxygen) exist within the wetland, and these can be divided into separate cells. Groundwater is either pumped or allowed to naturally flow through the wetland. The anaerobic cell uses plants in concert with natural microbes to degrade the contaminant. The aerobic cell further improves water quality through continued exposure to the plants and the movement of water between cell compartments. Straw, manure or compost is used, with little or no soil, in wetlands constructed primarily for the removal of metals. For wetlands constructed to treat explosives-contaminated water, certain plant species are used to support degradation. The process of using plants to break down contaminants is also referred to as phytoremediation.

http://www.cpeo.org/techtree/ttdescript/conwet.htm

Answer 2

it is the construction of wetlands