We Are… Group No: 05

Name Id noAl-amin Khandakar 20-019

Pantho Sarker 20-033Shahriar Md. Lukman 20-047

Gourav Roy 20-059Md. Gulam Kibria 20-075

We are Presenting…

Eutrophication

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Gourav Roy Id No: 20-059

Derivation of the Word “Eutrophication”

Eutrophication

“Eu”means “well”

“trope” means “nourishment”

What is Eutrophication

From that sense “Eutrophication” refers to the over nutrition of Nitrogen, Phosphorus and Carbon in the water bodies.

From another sense, eutrophication is the ultimate consequence of bacterial decomposition of the green lives and further scarcity of oxygen and suffocation as well.

Types of Eutrophication

There are two types of eutrophication:

• Natural Eutrophication• Cultural Eutrophication

EutrophicationNatural Eutrophication

Cultural Eutrophication

Natural Eutrophication

Eutrophication that is caused by the normal process of the nature not interfered by human activities is termed as natural eutrophication.

This sort of eutrophication takes many years to affect the water bodies in a full force.

Water bodies not near the industrial or human habitat places are affected by such sort of eutrophication. Figure: Natural Eutrophication

Cultural Eutrophication It’s a sort of eutrophication

that is caused by human activities.

It’s a rapid process as it takes only decades to eutrify and ultimately pollutes the water. So it is much more alarming than the natural eutrophication.

It’s a process that speeds up the natural eutrophication process.

Figure: Cultural Eutrophication

Sources of Eutrophication

Sources of Eutrophication

Sources of Eutrophicat

ion

Point sources

Industrial sources

Power plants

Sewage Treatment

Plants

Non-Point Sources

Urban sources

Agricultural sources

Chemical Fertilizers

Manure

AquacultureFossil fuel sources

Forestry Land sources

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Md. Gulam Kibria Id No: 20-075

Sources of Eutrophication (Continued)

Point Sources:Point sources are directly attributable to one influence. In point sources the nutrient waste travels directly from source to water. Point sources are relatively easy to regulate.

. Types DescriptionIndustrial Sources

Wastes from industries as emitted through pipes and proper drainage points, it is the prominent point source.

Power Plants Power plants have specific emitting points through which wastes are emitted

Sewage Treatment Plants

Treatment process releases oxides of Nitrogen and Phosphates in effluents, which drain into water bodies

Sources of Eutrophication (Continued)

Non-point Sources:Nonpoint source pollution (also known as 'diffuse' or 'runoff' pollution) is that which comes from ill-defined and diffuse sources. Nonpoint sources are difficult to regulate and usually vary spatially and temporally (with season, precipitation, and other irregular events).

Types DescriptionUrban Sources Habitants of urban areas when emit their

wastes haphazardly, it becomes a non-point source.

Agricultural Sources Agricultural wastes like peats, cow-dung, vegetable wastes are of this type.

Fossil Fuel Sources If emissions of fossil fuels have no specific point source it is non-point source.

Forestry Land Sources Forestry land sources are also non-point sources of eutrophication.

Causes of EutrophicationNatural run-off of nutrients from the

soil and the weathering of rocks.

Run-off of inorganic fertilizer

Run-off of manure from

farms

Run-off from erosion

Discharge of detergents (containing

phosphates).

Discharge of partially treated

or untreated sewage

Causes ofEutrophication

Normally the sources of eutrophication are indirectly responsible for eutrophication. But the responsible causes are here in this picture:

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Pantho SarkerId No: 20-033

Steps of Eutrophication Process

1. Fertilizer flows into water causing…

2. Increased plant growth on the surface of water, causing…..3. Decreased light in lower levels of water, causing…

Steps of Eutrophication Process (Cont’d)

4. Plants in lower levels of water to die, causing….

5. Decay using up O2 and increasing CO2,causing…...

6. Death of fish and other animals.

Eutrophication Process in 5 Stages

NUTRIENTS LOAD UP

PLANTS FLOURISH

ALGAE BLOOMS, OXYGEN

DEPLETED

DECOMPOSITION FURTHUR DEPLETES OXYGEN

DEATH OF THE ECOSYSTEM

Visual Overview of the Eutrophication Process

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Shahriar Md. Lukman

Id No: 20-047

Impacts of Eutrophication

Impacts of Eutrophicatio

n

Positive Impacts

Negative Impacts

Negative Impacts of Eutrophication

Negative Impacts of

Eutrophication

Ecological Impacts

Human health Impacts

Socio-economic Impacts

Impact on Recreation and

Tourism

Aesthetic Impacts

Economical Impacts

Other Impacts

Negative Impacts of Eutrophication (Cont’d) Ecological Impacts:

Human Health Impacts:Harmful algal blooms which produce algal toxins found in marine ecosystem cause harm to human beings as well as animals

Increased biomass of phytoplankton resulting in algal blooms

Increased blooms of gelatinous zooplankton

Increased biomass of macroalgae

Toxic or inedible phytoplankton species

New species invasion & Decreases in water transparency

Dissolved oxygen depletion or hypoxia resulting in death of benthic animals

Negative Impacts of Eutrophication (Cont’d)

Socio-economic Impacts:Impact Description

Impact on recreation and tourism

Decreases the fitness for use of the water for water sports (swimming, boating and fishing);

Aesthetic impacts Algal blooms are unsightly and can have unpleasant smells.

Economical impacts Infected waters increases the costs of water treatment;Threat for fishing industries;

Negative Impacts of Eutrophication(Cont’d) Other Impacts:

Increased vegetation may impede water flow and the movement of boats

Decrease in the amenity value of the water;

The water may become unsuitable for drinking even after treatment

Increase in rate of sedimentation

Positive Impacts of Eutrophication

Improves biodiversity.

Boosts ecotourism.

Source of fish’s food.

Aids in waste removal.

The positive impacts of eutrophication are:

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Al-Amin Khandakar

Id No: 20-019

World’s Scenario of Eutrophication

The Potomac River, the fourth largest river along the Atlantic coast and the 21st largest in the United States

Lake Erie, the fourth largest lake of the five Great Lakes in North America

World’s Scenario of Eutrophication (Cont’d)

Lake Iamonia, located at northern Leon County, Florida, USA.

Lake Biwa ,the largest freshwater lake in Japan

World’s Scenario of Eutrophication (Cont’d)

Lake Tai or Lake Taihu, a large freshwater lake in the Yangtze Delta plain near Shanghai, China

Lake Naivasha, located in Kenya

World’s Scenario of Eutrophication (Cont’d)

Dianchi Lake or Lake Dian and Kunming Lake, is a large lake located at southern China

Lake Winnipeg, a large in central North America

Bangladesh’s Scenario of Eutrophication

Gulshan Lake, located at Dhaka City

A village pond, located at Manikganj

Bangladesh’s Scenario of Eutrophication

An Eutrophic river at Bandarban

An Eutrophic river at Munshiganj

How to Control Eutrophication?

Shellfish in estuaries

Minimizing nonpoint pollution• Riparian buffer zones• Nitrogen testing and modeling• Organic farming • Reducing the Importing Nutrients• Endogenous Nutrients Control• Reducing soil erosion• Implementing Law

Eutrophication

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