Wastewater Workshop in Nairobi
29-th August till 03-th September 2011
Optimization of
Wastewater Disposal
Dr.- Ing. Rainer-Werner Abendt
Nuremberg
Contact: rainer.abendt@gmx.de
Rainer Abendt
Optimization of Wastewater Disposal
Energy Schematic
Flow Chart
Sources of energy
Demand for energy
Minimization of
Energy consumption
Wastewater
Wastewater
Wastewater
Sludge / Gas
Treatment plants
Wastewater
Biomass / Co-Digestion
Biomass / Co-Digestion
Sewer system
Sludge (Mono / Co)
Waste
Sewer system
Waste treatment
plants
Sludge (Mono / Co)
Waste
Waste, Biomass
Rainer Abendt
Sludge / Gas
Waste, Biomass
Optimization of Wastewater Disposal
Energy Chart
Sources of energy
Wastewater
•
•
•
•
•
Use of the wastewater heat
Potential power addition to the
WW treatment plants
Anaerobic waste water
processing
Energy generation by
digestion of the sludge/ gas
Energy generation with
biomass Co-digestion
Rainer Abendt
Waste
•
•
•
•
Sludge incineration
Waste incineration
Digestion of biomass
waste
Use the gas of the dump
River
• Hydro Electric power
• NAWARO Model used to
Calculate data.
• Geothermal Power
Optimization of Wastewater Disposel
Co-digestion of Waste at WWT plant
Mode of operation
Treatment
plant
Waste from
Sludge
Biological waste
Preparation
Contaminated
materials
Mixer
Storage
Electric power
Digester
Heat
Storage
Wastwater
Dewatering
Utilization
Rainer Abendt
Optimization of Wastewater Disposel
Examples of
CoSubstrates
Vegetable residue
(Biomass)
Rainer Abendt
Grease trap material
Optimization of Wastewater Disposal
More
Examples of
Co-Substrate
Food waste
Rainer Abendt
Frying fat
Water Treatment
Phosphorus removel by sludge
Process Using Denitrification !
No dissolved O2!
Bacteria take O2
from inside a
macromolecule
and use to make
CH4 and CO2
Dissolved
Carbon particle
PO4 is converted
to PO3 and energy
is released
Rainer Abendt
Nitrogen (gas)
N-ox
Water Treatment
Treatment 3. Step: 2. Activated Sludge (N) (low loaded)
Pressed Air
Denitrification
Nitrification
Recirculation
Carbon Substrate
Sludge recirculation
Gravity Thickeners
Activated Sludge
Rainer Abendt
Secondary
Claryfiers
Water Treatment
Air
Rainer Abendt
Optimization of Wastewater Disposal
Uses of Wastewater Include:
• Use of the water heat outside the sewer or the treatment
plant for heating or conversion to electricity
• As an alternative energy source for the treatment plant
• In Anaerobic wastewater processing
• For agricultural use through irrigation by farmers
• Treated water for recycling in industrial processes
• Energy generation of sludge digester (Methane gas)
• Energy generation of biomass, or organic waste
similar with the sludge in the digester
• Dried Sludge for fertilizing in agriculture
• Sludge incineration for heating energy
Rainer Abendt
Optimization of Wastewater Disposal
Thank you for
your attention
Rainer Abendt