water quality management chapter 8

water quality management chapter 8 - Chapter 8 WATER...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 8 WATER QUALITY MANAGEMENT
Background image of page 1

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

View Full DocumentRight Arrow Icon
Water quality • Water quality is often assessed in relation to water’s suitability for drinking water consumption or support of aquatic life, aquatic consumption, or aquatic recreation. • seven classes of beneficial uses of water: • Drinking Water – Class 1 • Aquatic life and recreation – Class 2 • Industrial use and cooling – Class 3 • Agricultural use, irrigation – Class 4A • Agricultural use, livestock and wildlife watering – Class 4B • Aesthetics and navigation – Class 5 • Other uses – Class 6 • Limited Resource Value Waters – Class 7
Background image of page 2
• Drinking water resources is scarce. Point Sources (single discharge point). Point sources have Well defined origin, are easily measured and generally constant. As the name implies, point source pollution represents those activities where wastewater is routed directly into receiving water bodies by, for example, discharge pipes, where they can be easily measured and controlled. • Treated municipal and industrial wastewater Non-point Sources (multiple discharge points), they are of diffusive origin, transient, and quantities often depend on precipitation • Urban and Agricultural runoff
Background image of page 3

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

View Full DocumentRight Arrow Icon
Major sources of U.S. stream pollution
Background image of page 4
Sources of non-point pollution
Background image of page 5

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

View Full DocumentRight Arrow Icon
Sources of non-point pollution-cont’d
Background image of page 6
Composition of typical sewage BOD 200 - 290 mg/L TSS (total suspended solids, solid materials, including organic and inorganic, that are suspended in the water) 200 - 290 mg/L Nitrogen 35 -100 mg/L Phosphorus 18 - 29 mg/L Coliforms 10 10 -10 12 / ml Fecal Coliforms 10 8 -10 10 / ml
Background image of page 7

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

View Full DocumentRight Arrow Icon
Common water pollutants • Oxygen Demanding Material • Excess nutrients (Nitrogen and phosphorus compounds) • Suspended Solids •S a l t s • Toxic metals and organic compounds • e.g. Arsenic, Endocrine-Disrupting Chemicals (EDCs) • Pathogens • Heat
Background image of page 8
Physical pollutants • Physical pollutants can be categorized as follows: solids content, solids type, colour, odour, taste, conductivity, temperature. Each of these categories can have chemical or biological sources. Colour . Wastewater is "colored" if it is not completely clear. Color can be suspended colour (apparent color) or dissolved color (true color). Color is quantitatively determined by visual comparison with a known concentration of colored solutions or by spectrophotometric methods. Odor like taste, is a measure of the effect of a stimulating substance on human respiratory membranes. Pure unpolluted water is a measure of zero odors. An odour in a wastewater is recognized as a potential environmental hazard. The accepted odour test is the Threshold Odour Test in which a sample is diluted with pure water until the least perceptible odour is noticed. Taste
Background image of page 9

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

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 44

water quality management chapter 8 - Chapter 8 WATER...

This preview shows document pages 1 - 10. Sign up to view the full document.

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