The plants are used for
various ways. I search the plants of a power of cleaning water. The plants
effect the environment so much. So, we should use this power more effectively.
This power may use the area of the water is dirty in a developing countries.
Cleaning Water Area
There are many systems of
cleaning water. The first, coming suspended solid to place that living plants
in water, the plants work as contact substance and stimulate settle down. The
second, the existence of plants in water make more microbes and this advance to
BOD removal which is the quantity of the plants need for oxidative destruction
called for biochemical oxygen demand. If BOD removal point is large, the water
is dirty. The third, coming nitrogen to place that living plants in water, the
plants decompose ammonia or other nitrogen compound. These mineral salts are
absorbed and removed. This reaction is only happened under aerobic condition.
The high nitrogen removing function is taken place by the oxygen transport from
plant’s roots. The forth, if microbes change organic matter to inorganic
substance, the plants absorb inorganic substance. In this way, the phosphorus
in the water is removed. The other system is that growth of phytoplankton is
lower by existence of plant group, because they cut off sunlight.
The System of Cleaning Water
The merits of cleaning water
system by using plants are making possible to remove nitrogen and phosphorus,
the growth of phytoplankton is lower by existence of plant group, using for the
low density water area is possible, saving energy because using solar energy,
not required the high support and control system.
The demerits of cleaning water
system by using plants are influenced dealing abilities by weather condition,
implying large land, re-elution nitrogen
and phosphorus happens
when I do
not carry out the cutting down of
the plant body.
Some plants face to a crisis phase. For example, in near the
rice field, there is ordinary living plant in the water. But, nowadays, the
herbicide is used various area. So, the plants are killed and getting fewer. And,
waterweeds are brought in from overseas and multiply in Japan. As a result, the Japanese waterweeds are selected and decreased.
Finally, I think cleaning water by using plants should more
and more develop this system. So, the researchers and companies make the effort
to resolve the demerits of this system. I want to build up effective system in
the future. I’m looking forward to materialize this targets.
http://www.see.eng.osaka-u.ac.jp/wb/home/database/gainen.htm
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