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Public Health

Public Health, sewage treatment, exam 2

sewage treatment removal of diseases like typhoid, cholera, shigellosis
sewage 99.9% water, 0.1% solid/dissolved waste
waste includes human feces, detergents, grease, garbage disposal waste, industrial waste
industrial waste acids, chemical waste, organic matter from food processing plants
3 steps in sewage treatment primary, secondary, tertiary
primay sewage treatment removal of as much solid waste as possible; filters, skimmers, chemical glocculating agents-aluminum sulfate
secondary sewage treatment biological degradation using microbes; oxygenation maintained to facilitate breakdown - aerobic process
microbes used in sewage treatment sphaerotilus, beggiatoa
Anaerobic process uses organisms like methanococcus, peptococcus in sludge digesters, methane is produced as a by product
methane used for cooking, heating undigested material is removed and used as a soil conditioner
aerobic process of sewage treatment biological degradation using microbes (sphaerotilus, beggiatoa
from secondary sewage treatment effluent is chlorinated & released into rivers
tertiary treatment costly, involves chemical & physical methods
tertiary treatment recycling of water, sand and charcoal filters used
tertiary treatment flocculating chemicals used, denitrifying bacteria converts nitrates into nitrogen
tertiary treatment chlorine used to kill microbes
tertiary treatment uv light used to replace chlorination in US
tertiary treatment in Europe ozone being used in place of chlorine
septic tank system @ 50 million US families use
septic tank system can't flush poisons or grease out b/c kill beneficial microbes in soil
septic tank system drain fields become rich soils for kitchen garden
drains need to be replaced @ 10-12 years
well water must be @ least 50 ft. from septic tank
clivus multrum European system
clivus multrum composting toilet system, handles only urine
clivus multrum human waste goies thru series of chambers as decomposes & after 2-4 years arrive at final chamber as rich humus - applied to garden soil
clivus multrum water from kitchen, laundry, bathroom handled separately for gardening
Created by: JYarger