trap sediment with low flow that allows settlement of particles (DeBusk 1999)
under influence of gravity and relative densities of suspended material. In the
chemical process, various mechanisms like photooxidation, volatilization, and
sorption are involved. In biological methods, plants uptake contaminants directly
into the root structure, called phytodegredation, while when they secrete substances to aids biological degradation, it is called rhizodegradation. The transpiration of contaminants through the plant leaves is called phytovolatilization
(Interstate 2003). Also the microorganisms in soil of wetland store nutrients,
but organic pollutant removal is crucially driven by the metabolic functions.
Fig. 11.7 Types of constructed wetland
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271
under influence of gravity and relative densities of suspended material. In the
chemical process, various mechanisms like photooxidation, volatilization, and
sorption are involved. In biological methods, plants uptake contaminants directly
into the root structure, called phytodegredation, while when they secrete substances to aids biological degradation, it is called rhizodegradation. The transpiration of contaminants through the plant leaves is called phytovolatilization
(Interstate 2003). Also the microorganisms in soil of wetland store nutrients,
but organic pollutant removal is crucially driven by the metabolic functions.
Fig. 11.7 Types of constructed wetland
11 Toxic Metals in Industrial Wastewaters and Phytoremediation Using. . .
271