This document discusses water quality management and focuses on water pollutants, their sources, and management strategies for rivers and lakes. It outlines various types of pollutants including oxygen-demanding materials, nutrients, pathogens, suspended solids, salts, toxic compounds, and heat. For lakes, it describes limnology, stratification and turnover, biological zones, productivity levels, eutrophication processes, and algal growth requirements. It also discusses controlling phosphorus from sources like wastewaters, septic tanks, agricultural runoff, and acidification to manage water quality in lakes.

1. Water Quality Management Introduction Water Pollutants and Their Sources Water Quality Management in Rivers Water Quality Management in Lakes

2. Introduction Water Quality Management – is concerned with the control of pollution from human activity so that water is not degraded to the point that it is no longer suitable for intended uses. -waste tolerance (assimilation)

6. Oxygen Demanding Materials– Anything that can be oxidized in the receiving water with the consumption of dissolved molecular oxygen.

7. Nutrients– Nitrogen and Phosphorus.

8. Pathogenic Organisms– Bacteria, Viruses and Protozoa excreted by diseased persons or animals

9. Suspended Solids– Organic and Inorganic particles carried by wastewater

10. Salts– (TDS) they don’t evaporate. Toxic Metals and Toxic Organic Compounds– render a body of water nearly useless for long periods of time Endocrine Disrupting Chemicals– (EDC) an external agent that interferes in some way with the role of natural hormones in the body.

11. Heat– (waste heat) sometimes called Secondary heat or Low-grade heat refers to heat produced by machines, electrical equipment and industrial processes for which no useful application is found.

12. Water Quality Management in Lakes Limnology– the study of lakes Stratification and Turnover– annual changes in water temperature

13. Biological Zones– determined by the availability of light and Oxygen

14. Lake Productivity– ability to support a food web Low level of productivity, limited supply of nutrients to support algal growth Intermediate High level of productivity, abundant supply of algal nutrients

15. Senescent lakes– old shallow lakes with thick organic sediments and rooted plants in great abundance.

16. Euthropication– natural process, lakes become more shallower and more productive. Cultural Euthropication– human activity speeds the natural process

17. Algal Growth Requirement– macronutrients such as: Carbon– dissolved carbon dioxide in water Nitrogen– nitrates from external sources Phosporus– also from external sources

18. Control of Phosphorus

19. Municipal and Industrial Wastewaters Septic Tank Seepage Agricultural Runoff Acidification of Lakes

20. Thank You!