1. SNS COLLEGE OF ENGINEERING
Marine pollution

2. Marine pollution
The introduction by man, directly, or indirectly, of substances or energy to the marine environment resulting in deleterious effects such as: hazards to human health, hindrance to marine activities, impairment of the quality of seawater for various uses and reduction of amenities.
Does not include natural processes like volcanic eruptions or earthquakes

3. Marine pollutants
Agricultural run offs ((herbicides, pesticides and nutrients)
Sediments
Sewage (Faecal Coliform and Pathogens)
Chemicals, Metals and Radioactive Substances
Persistent toxins (PCBs, DDT, heavy metals)
Oil
Plastics
Energy (Thermal & light)

4. Sources of marine pollution
Land sources
80% of non-biological marine pollution comes from land based activities
pipes discharging directly into marine waters(sewage,
industrial, chemical and food processing wastes)
Riverine flows into the sea carry pollutants from the entire catchment area.
From Air
Global atmospheric inputs to the sea from air discharges
Oil spills and offshore sources
Oily discharges from ballast water and bilge water during routine ship operations and illegal dumping of solid waste
Designated dumping grounds at sea
Accidental spills from Ships carrying hazardous substances, oil, gas etc.

7. Control measures for oil pollution
Natural process of emulsification of oil by use of chemical dispersants: can be sprayed on the oil.
Slick-lickers: continuous belt of absorbent material dips through the oil slick & is passed through rollers to extract oil.
Rocks can be cleaned with high pressure steam

8. Effects of marine pollution:
Effects on sea life
Effects on birds
Effects on human being
Health
Business
Eutrophication and development of red tides (phytoplankton blooms carrying red pigmentation)
Development of oil slick: When oil is spilled on sea, it spreads over the surface forming a thin film called OIL SLICK. Which damage marine life

9. Effects of marine pollution
Damages marine life to a large extent, for salt-marsh plants, oil slicks can affect flowering, fruiting and germination.
Coral reefs
If liquid oil contaminates a bird’s plumage, its water-repellent properties are lost, drown, die
Drill cuttings dumped on seabed create anoxic conditions & result in the production of toxic sulphides in the bottom sediment thus eliminating the benthic fauna.
Fish and shellfish production facilities can also be affected by oil slicks. Commercial damage is tainting: imparts an unpleasant flavor to fish and seafood & is detectable even at extremely low levels of contamination.

10. Thank You