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BOD and Eutrophication
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Biological Oxygen Demand and Eutrophication

Aishwarya Mishra
A Double post graduate in Zoology(MSc) (2017) as well as in Education (MA)(2017) with State Govt. B.ed(2015), Qualified IBPS RRB PO & OPSC

U
Unacademy user
Thanku sir this is very helpful for me and sir I want to know about guttation topic plzz make on this video
Sandeep Dhuper
a year ago
most welcome....will upload the guttion video most probably by today or tomorrow. stay tuned and dont forget to share my lesson links with your friends and classmates. Happy Learning!!
Vinita sharma
a year ago
Yes sir I will already share your lesson and link
  1. Water Pollutiorn AISHWARYA MISHRA M.SC. IN ZOOLOGY (2017) MA IN EDUCATION (2017) B.Ed (2015)


  2. Pollutants Found in Runoff Sediment Soil particles transported fromLeaves their source Biochemical Oxygen Demand (BOD) . Oxygen depleting material Organic material Toxics Nutrients . Various types of materials that become dissolved and suspended in water (commonly found in fertilizer and plant material) . Pesticides > Herbicides Fungicides Insecticides - Metals (naturally occurring in soil, automotive emissions/ tires) Nitrogen (N) Phosphorus (P) Lead Zinc Bacterial Pathogens Originating from: Thermal Stress Mercury Petroleum Hydrocarbons (automotive exhaust and fuel/oil) e Pets e Waterfowl . Failing septic systems vegetation Heated runoff removal of streamside Debris Litter and illegal dumping


  3. Potential Sources of Pollutants Found in Reside ntial Areas Nutrients: Fertilizers and septic systems Pathogens: Pet waste and septic systems Sediment : Construction, road sand, soil erosiorn Toxic : Pesticides, household products Debris: Litter and illegal dumping Thermal: heated runoff, removal of streamside veqetation BUY


  4. Pollutants from Agriculture Sediment Nutrients Pathogens Pesticides


  5. Why are these pollutants important? Sediment reduces light penetration in stream, clogs gills of fish and aquatic invertebrates. Nutrients act as fertilizer for algae & aquatic plants which can cause highly varying dissolved oxygen levels. At low DO levels, the aquatic life has the potential to be harmed Toxics can impact life and contaminate drinking water supplies. Bacteria/Pathogens are an indicator of possible viruses present in the system.