Sea Water Pollution

Characteristics of Water Pollution

• Water pollution is a large set of adverse effects upon water bodies such as lakes, rivers, oceans, and groundwater caused by human activities.

• natural phenomena are not deemed to be pollution

• An important effect of pollution is Eutrophication which is is the fertilization of surface water by nutrients that were previously scarce

• Water pollution is a major problem in the global context

Eutrofication

Elefsina’s Bay

• Is located near Athens, the capital city of Greece• The three main pollution sources:

1. municipal wastes2. industrial wastes3. naval activities

• the time for the water renewal of the inner gulf comes up to one month

The Chosen Locations

• Loutropirgos: because of the nutritious graduation from the west to the east side

• Aspropirgos: because of the existence of Halivourgiki

The Location

The Instant Measurements

• Loutropirgos: water’s pH → 7,98

salinity → 37,3 ppt

conductivity → 56,2 mS

• Aspropirgos: water’s pH → 8,07

salinity → 37,4 ppt %

conductivity → 56,4 mS

Measurements at the UniversityMethods Used… …to find out

Spectrophotometry chlorophyll

Centrifugation chlorophyll

Reaction with KI & Na2S2O3

nitrates

Filtration Suspended matter

Measurements:Station name NO2

-

(in mg/L) Dissolved O2

(in mg/L)Chlorophyll (in mg/L)

Loutropirgos 0.0065 0.0065 0.4272

Aspropirgos 0.0023 0.0023 0.8437

General Conclusions

• Neither Aspropirgos or Loutropirgos is heavily polluted.

• That can be explained by the existence of an island called Psitalia in which all the wastes are accumulated and primary treated.

Specialised Conclusions:

• Dissolved O2 > in Loutropirgos

• Chlorophyll > in Aspropirgos

• Nitrates > in Loutropirgos

→ So Aspropirgos is more polluted than Loutropirgos.

Explanation • Because of Aspropirgos location

• The existence of Halivourgiki & St.George’s stream

Ways to Prevent Water Pollution

• Action should be taken to clean Kifissos river.

• This could be achieved by putting filters in the water so that the wastes won’t reach the sea.

• Secondary Biological Cleaning should be done in Elefsina’s Bay

This was a project made by:

Angelica Athanasopoulos

Eleana Siskos

Eleana Vassiliadis

Julia Kotsonis