Wastewater treatment & methane.ppt · Water trom primary clarifier with dissolved Organic matter Mixers tor aeration Sludge Waste sludge to Release Of excess biofllm and treated water

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