Rainer Abendt

Dr.- Ing. Rainer-Werner AbendtNuremberg

Contact: rainer.abendt@gmx.de

Wastewater Workshop in Nairobi 29-th August till 03-th September 2011

Optimization ofWastewater Disposal

Rainer Abendt

Optimization of Wastewater Disposal

Energy Schematic Flow Chart

Sources of energy Demand for energyMinimization of

Energy consumption

Wastewater

Waste

Wastewater

Sludge / Gas

Biomass / Co-Digestion

Sludge (Mono / Co)

Waste, Biomass

Sewer system

Treatment plants

Waste treatment plants

Wastewater

Waste

Wastewater

Sludge / Gas

Biomass / Co-Digestion

Sewer system

Sludge (Mono / Co)

Waste, Biomass

Rainer Abendt

Optimization of Wastewater Disposal

Energy Chart

Sources of energy

Wastewater Waste River

• Sludge incineration• Waste incineration • Digestion of biomass

waste• Use the gas of the dump

• 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

• Hydro Electric power• NAWARO Model used toCalculate data.• Geothermal Power

Rainer Abendt

Optimization of Wastewater Disposel

Co-digestion of Waste at WWT plantMode of operation

Biological waste

Treatment plant

Waste from

PreparationContaminated

materials

Sludge

MixerStorage

Digester

Electric power

Heat

Wastwater

Storage

Dewatering

Utilization

Rainer Abendt

Optimization of Wastewater Disposel

Vegetable residue(Biomass)

Grease trap material

Examples of Co-Substrates

Rainer Abendt

Optimization of Wastewater Disposal

Frying fatFood waste

More Examples of Co-Substrate

Rainer Abendt

Water Treatment

Process Using Denitrification !

Dissolved Carbon particle

N-ox

Nitrogen (gas)No dissolved O2! Bacteria take O2

from inside a macromolecule and use to make

CH4 and CO2

Phosphorus removel by sludge

PO4 is converted to PO3 and energy is

released

Rainer Abendt

Water Treatment

Treatment 3. Step: 2. Activated Sludge (N) (low loaded)

Carbon Substrate

NitrificationDenitrificationRecirculation

Sludge recirculationGravity Thickeners

Secondary Claryfiers

Activated Sludge

Pressed Air

Rainer Abendt

Water Treatment

Air

Rainer Abendt

Uses of Wastewater Include:

Optimization of Wastewater Disposal

• 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