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23 Cards in this Set
- Front
- Back
primary treatment for sewage treatment
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sedimentation -- grit chamber (grinding rocks/stones) skimmer (removes floating materials) removes 25-30% BOD
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Decomposition of microbes in the ecosystem
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cycling important elements
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coliform analysis
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coliform = small G- bacillus, facultative, non-spore forming,ferment lactose to acid or gas
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Nitrosomes
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eats ammonia
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Treatment
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removes impurities, and bacteria, decreases turbidity and removes tastes and odors
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nitrobector
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eats bacteria
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water analysis
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determines if water is potable (safe to drink)
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activated sludge (2ndary trtment)
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pumping effluent into large tank oxygen is added and a colony of microbes also added. Aerobic oxidation of the organic matter decreases BOD 75-95%
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N-fixation
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nitrogen gas converted to ammonia
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trickling filter (2ndary trtment)
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bed of rocks that are colonized with microbes effluent is sprayed over the rocks in a fide mist, oxygen is added -- microbes oxidize using oxygen the organic matter removes 80-85% BOD
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Nitrogen cycle - primary producers plants (photolithotrophes) primary consumers animals
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when death occurs organic N is source (plants cant use), plants will take source and form protein, -- amino group is removed ammonia formed (amonification) -- nitrofication NH3-NO2-NO3 (chemolithotrophes) - plants can now make more food NO3 cold be converted to nitrogen gas (denitrification)
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Sewage treatment (used water supply of a community)
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eliminate pathogens, decrease BOD biological oxygen demand higher BOD = more organic mater
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All plants look for E-coli as a coliform because
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it is an indirect indication of fecal contamination
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2 methods of secondary sewage treatment for liquid are
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effluent
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turchiary treatment for sewage material
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effluent -- chlorinate (decrease # of microbes -- dechlorination) -- sent back to river or remove phosphate or nitrate or you can reduce 100% BOD with a charcoal filter
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sludge
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insoluable material after primary treatment
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aeration
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removes tastes and odors by oxidaion
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addition of floculatio alum or calcium salts
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causes particular matter to clump
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secondary sewage treatment for sludge
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pumped into anaroebic digestors - microorganisms inside will attack sludge takes 2-4 weeks -- methane produced BOD reduced 35% undigested sludge is burned, buried, or sold as fertilizer
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sedimentation
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organic matter is now insoluable settles out 80% decrease in turbidity
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chlorinate
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disinfectant to prevent microbial growth
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symbiotic
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live in root hair of plants
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sand filtration
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removes 99% of organic matter
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