wastewater treatment & methane.ppt · water trom primary clarifier with dissolved organic...

Microbiology of waste waterMicrobiology of waste water treatment and methane

production

ContentWaste water treatment

N- and P-removalN and P removalMethanogenesis

Thermodynamics of fermentationsGlobal methane productionGlobal methane production

Water qualityWater quality

TOCTotal Organic CarbonTotal Organic Carbon

CODChemical Oxygen DemandChemical Oxygen Demand

BODBi h i l O D dBiochemical Oxygen Demand

Fill and Draw system

3 biopolymersp y

Anaerobic digestionAnaerobic digestion

Upflow Activated Sludge Blanket (UASB) reactor

MethanogensMethanogensFermentation reactions

ThermodynamicsGlobal methane production

Fi 27 2 C b lFig. 27.2 Carbon cycle

Nernst equation

aA + bB cC + dDaA + bB cC + dD

∆G’ = ∆Gº’ + RT ln (C)C (D)d/(A)a(B)b( ) ( ) ( ) ( )

∆G’ = ∆Gº’ + 5.7 log (C)C (D)d/(A)a(B)b

Do not include H2O or H+

(they are constants under standard conditions)Gases can be expressed in partial pressures (atm)

Increase atmospheric CH4

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