Algal blooms WATER POLLUTANT TYPES OF WATER POLLUTIONCHEMICALS

Algal blooms

WATER POLLUTANT • • TYPES OF WATER POLLUTION-CHEMICALS ETC. WATER BORNE DISEASES EUTROPHICATION SEWAGE TREATMENT OXYGEN SAG CURVE BIOACCUMULATION AND BIOMAGNIFICATION SOLUTIONS

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Figure 12. 3 Lake Chad 1973 -2001 © 2013 Pearson Education, Inc.

Figure 12. 5 Water Budget ATMOSPHERE Contains 12, 600 km 3 of water 271 km 3/day About 1/4 of total global precipitation falls on land Precipitation Evaporation 989 km 3/day Most water flux occurs between the oceans and the atmosphere 170 km 3/day Most of the rain that falls on land evaporates back to the atmosphere from land surfaces and plant leaves (evapotranspiration). LAND Streams, lakes, and groundwater contain 4, 124, 200 km 3 of water 888 km 3/day 101 km 3/day Precipitation Runoff and groundwater OCEANS Contain 1, 230, 000 km 3 of water © 2013 Pearson Education, Inc.

Disease organisms • • • Typhoid-bacteria Dysentary-bacteria or amoeba Schistosomiasis worm Polio-virus Cholera-bacteria

WATER POLLUTION • • • POLLUTANTS DISEASE ORGANISMS SEWAGE TREATMENT OXYGEN SAG CURVE EUTROPHICATION

Sewage organisms • http: //www. youtube. com/watch? v=r. J 6 hf 14 M BYU

BOD-BIOCHEMICAL OXYGEN DEMAND • EXPRESSED IN mg. O 2 per liter of H 2 O • Amount of oxygen needed to gobble up organic chemical • Sewage entering a sewage plants has a BOD of 295 mg. O 2/l-influent • Sewage leaving a sewage plant should have a BOD of 5 mg. O 2/liter-effluent

SEWAGE TREATMENT • PRIMARY TREATMENT-SETTLING OUT HEAVY ITEMS • SECONDARY TREATMENT • a. activated sludge • b. trickling filter • c. oxidation ponds

DENSITY VS BIODIVERSITY

eutrophication • http: //www. youtube. com/watch? v=UGq. Zs. Su G 7 ao

http: //www. youtube. com/watch? feature=fv wp&NR=1&v=XUCTif 22 Iw. Q

http: //www. youtube. com/watch? v=ar. Pq. Po. F OQUM

http: //www. youtube. com/watch? v=Qx 6 aj 3 U 5 Hp 0

http: //www. youtube. com/watch? v =uu. ORuwb 4 cfs • Septic system

Runoff from land

BIOMAGNIFICATION AND BIOACCUMULATION

DDT concentration: increase of 10 million times DDT in fish-eating birds 25 ppm DDT in large fish 2 ppm DDT in small fish 0. 5 ppm DDT in zooplankton 0. 04 ppm DDT in water 0. 000003 ppm © 2013 Pearson Education, Inc.