Lecture 19 Determinants of Water Quality

Lecture 19 Determinants of Water Quality - Freshwater and...

Info iconThis preview shows pages 1–19. Sign up to view the full content.

View Full Document Right Arrow Icon
Freshwater and Freshwater Pollutants
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
"any biological, chemical, or physical change in water quality that has a harmful effect on living organisms or makes water unsuitable for desired uses." Water Pollution 44% of lakes, 37% of rives unsafe for recreation due to toxic water pollutants 32% of estuaries.
Background image of page 2
1) Biological 2) Physical 3) Chemical Basic Types of Pollution
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Develops from microorganisms and their activities. Biological Water Pollution
Background image of page 4
Viruses Protozoa Parasites Bacteria Biological Pathogens Typhoid Cholera Tuberculosis Hepatitis Polio Schistosomiasis Amoebic dysentery Giardiasis giardia poliovirus Pathogen: An agent of disease. An infectious organism Each year, 1.5 million Americans become ill as a result of bacterial contamination in drinking water
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Biological Pollution: Microbial Metabolism Metabolic activities of otherwise benign microorganisms can significantly alter surface water quality human waste animal waste food operations meat packing plants medical facilities Sources of Organics Discharge of organic material to surface water increases microbial activity Increased microbial activity can cause a decline in oxygen content of water
Background image of page 6
Physical Pollutants
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Physical Pollutants Hea t electric power plants – O2, thermal shock ½ of water withdrawn in the U.S. Warm water holds less O2
Background image of page 8
Sedimen t erosion, deforestation, agriculture, building and road construction chokes and fills lakes, reservoirs Physical Pollutants Turbidity and reduction of the euphotic zone Sediment particles harbor pathogens and pollutants
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chemical Pollutants Nutrients Pesticides Metals Salts Organics
Background image of page 10
Nutrient s Chemical Pollutants Nitrogen Phosphorus NO3 - NH4 + HPO4- 2 H2PO 4- Animal Wastes, Agricultural Runoff, Sewage Discharge, OSWT
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Primary Productivity All life on earth is directly or indirectly reliant on primary production. In terrestrial ecosystems, these are mainly plants, while in aquatic ecosystems algae and phytoplankton are primarily responsible . N and P stimulate primary productivity Nutrient additions stimulate primary productivity
Background image of page 12
Stimulation of Primary Productivity Warm Temperatures Water Nutrients
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Excess Nutrients Over-stimulate Primary Productivity Decreased light penetration Decreased oxygen content Changes in species diversity Urban Agriculture Wastewater
Background image of page 14
Heavy Metals and Metalloids
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Arsenic Erosion of natural deposits; pesticide waste, runoff from glass & electronics production wastes, treated lumber, groundwater Mercury Erosion of natural deposits; discharge from refineries and factories; runoff from landfills, coal burning Lead Corrosion of household plumbing systems; natural deposits, paint, fuels, electronics Heavy Metals and Metalloids
Background image of page 16
Lead found in blood sample from 1 of 10 Washingtonians Arsenic found in urine samples from 4 of 10 Washingtonians Mercury found in hair samples from 10 of 10 Washingtonians Mercury, Arsenic, and Lead
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chemicals
Background image of page 18
Image of page 19
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 88

Lecture 19 Determinants of Water Quality - Freshwater and...

This preview shows document pages 1 - 19. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online