WETLAND DEVELOPMENT: A GREEN TECHNIQUE FOR … · constructed wetland at Arizona's Jacob Lake Inn...
Transcript of WETLAND DEVELOPMENT: A GREEN TECHNIQUE FOR … · constructed wetland at Arizona's Jacob Lake Inn...
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WETLAND DEVELOPMENT: A GREEN
TECHNIQUE FOR REMEDIATION OF GANGA
POLLUTION AT KANPUR CITY
Department of Botany
BND College, Kanpur
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The River Ganga has been considered one of the
dirtiest rivers in the world.
The extreme pollution of the Ganges affects 400
million people who live close to the river.
The river waters start getting polluted right at the
source.
The exploitation of pollution in the river has just
proportional to industrialization and excessive growth
of population.
River Ganga
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Pathway of Ganga River
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Approximate 29 cities, 70 towns, and thousands of
villages are situated on the banks of Ganga.
More than 1.3 billion liters sewage per day goes directly
falls into the river.
More than 260 million liters of industrial wastes.
Municipal sewage constitutes 80% volume of the total
waste dumped into the Ganga.
The major pollutants of the Ganga are inorganic and
organic wastes, sewage (Domestic and Industrial), trash,
food, and human and animal remains.
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Pollution Status of River Ganga at Kanpur
Ganga at Kanpur is highly polluted.
Major pollutants of river:
Domestic and municipal waste water
Industrial specially lather industrial wastes
Road runoff
Agricultural runoff
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WETLANDS
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A wetland is an area of land whose soil is saturated with
moisture either permanently or seasonally. Such areas may
also be covered partially or completely by shallow pools of
water.
Wetlands include swamps, marshes, and bogs, among others.
The water found in wetlands can be saltwater, freshwater, or
brackish.
Wetlands have huge capacity to digest many harmful organic
and inorganic chemical pollutants of water.
The most significant attribute of wetlands is universal
capability to filtration and purification of polluted water into
clean water.
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PROPERTIES OF WETLANDS
Slow Down RunoffMost pollutants enter a wetlands area
through storm-water runoff, which contains
sediments, excess nutrients and animal waste
and toxic chemicals.
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PROPERTIES OF WETLANDS
Trapping Sediments
Because of the slow velocity of wetland
water, sediment settles to the bottom after the
conclusion of a rain event. It is then held in place
by plants, and eventually further sediment
deposits.
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PROPERTIES OF WETLANDS
Nutrients and Toxic Chemicals
Excess nutrients and toxic chemicals are
capable of causing water-quality problems and
are harmful to humans and animals alike. Many
of these are taken out of the water and utilized
by aquatic plants that convert them to less
harmful forms.
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PROPERTIES OF WETLANDS
Efficiency
According to the Ecological Society of
America (ESA), wetlands are capable of
removing 20 to 60% of metals from the water,
retaining 80 to 90% of runoff sediments and
can eliminate 70 to 90% of nitrogen buildup.
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MAJOR AQUATIC PLANTS SPECIES
FOUND IN WETLANDS
Eichhornia crassipes, Lemna
paucicostata, L. gibba, Spirodela
punctata, S. polyrhiza, Pistia stratiotes,
Typha latifolia, T. domengensistor,
Hydrilla sp., Potamogeton sp., Ipomea
aquatic and Salvinia sp.
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Today, artificially-constructed wetlands are purifying
water for municipalities, businesses and residences. A
constructed wetland at Arizona's Jacob Lake Inn treats
effluent from campgrounds, laundry facilities and rental
cabins, with a volume of 2,000 gallons per day.
A constructed wetland or wet park is an artificial wetland,
marsh or swamp created for anthropogenic discharge such
as wastewater, storm water runoff, or sewage treatment.
Constructed Wetlands
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Newly Planted constructed wetland
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Constructed wetland after two years
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TYPES OF CONSTRUCTED WETLANDS
Sub-surface Flow Wetland: Move the effluents
through soil or sand medium on which plants
are rooted.
Surface Flow Wetland: Move effluents above
the soil in a planted marsh/swamp.
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WETLANDS AND WATER PURIFICATION:
MECHANISM
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The water current enters into wetland, it slow down as it moves
through the wetland’s vegetation.
In the process of moving the water through the wetland’s
vegetation many pollutants initiate to settle down into bottom soil
of a wetland or become trapped among the vegetation.
The purification of water through wetlands contains a series of
physical, chemical and biological processes.
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Absorption
Sedimentation
Transformation
Neutralization
Precipitation
Predation
Filtration
Processes occurred in wetland
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Hypothetical constructed wetlands for the purification
of Ganga water at Kanpur city
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CONCLUSION
Thus, it can be said that the wet lands are best
green attempt to purify river Ganga at Kanpur city.
The development of constructed wetlands
comprising of algae and aquatic plants for
treatment of municipal sewage waste water
before allowing them to flow into the river as a low
cost and eco-friendly solution.
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THANK YOU