Water Pollution - Fundametnals of Biology - Lecture Slides, Slides of Biology

Download Water Pollution - Fundametnals of Biology - Lecture Slides and more Slides Biology in PDF only on Docsity! Water pollution Eutrophication and algal blooms Phosphorus is the nutrient controlling the size of freshwater blue-green algal blooms Amount of bio-available phosphorus (orthophosphate)  algal blooms Docsity.com Organic pollution Human sewage, refuse, agricultural waste like manure of chicken and pigs and certain industrial wastes which contain large amount of organic matter 1. Self-purification of water: The water is well aerated when the amount of organic pollutants is small. They are rapidly decomposed by bacteria and fungi into simple inorganic compound. If the amount of organic pollutants is very heavy , it will remove all the dissolved oxygen and self -purification of water. In the absence of oxygen the incomplete decomposition of organic matter by anaerobic bacteria produces many unpleasant smelling gases such as methane, ammonia and hydrogen sulphides. Docsity.com Pollutionby silanddetorgent er PO Oil Millions tones of oil leak out from oil tankers. Affects: - oil floats on water. The oil layer prevent oxygen dissolving in the water . - birds lose warmth quickly when there are covered with oil Docsity.com AFFECT OF SOAP 1.Forms insoluble scum with Ca 2+ &Mg 2+ of hard water 2CH3(CH2)16COO-(ag) (CH3(CH2)16COO-)2Ca2+(s) 2.forms insoluble long chain alkanoic acid 2CH3(CH2)16COO-(ag)  CH3(CH2)16COOH(s) Docsity.com Affect of soapless detergent •Health problems- cause skin allergies e.g.pH > 9 or < 5 •Branched hydrophobic chain are non- biodegradable •Ecological disturbance -formation of foams in rivers -prevent the breathing of aquatic lives kills aquatic lives •Phosphate additives(water softener) speed up the growth of algae Docsity.com Chemical pollution Pesticides - poisonous chemicals deliberately sprayed to kill a particular organism (e.g. herbicides, fungicides and insecticides) Thermal pollution High temperature - will raise the metabolic rate and oxygen consumption of aquatic organisms - decrease the oxygen solubility in water and the resulting deoxygenation may seriously affect the aquatic organisms. Docsity.com