Geiselbullach, D

Plant sheet:

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Plant capacity and expected performance:

• 2,000 metric tonnes DS/year (secondary sludge only)	• Increased biogas production
• 2 x 3,000 m³ digesters	• Improved sludge dewaterability
• Continuous Cambi THP

Amperverband decided in Board meeting on 14 September 2006 to buy Cambi a THP-C
(continuous) plant from Cambi ARGE Deutschland, an “Arbeitsgemeinschaft”/consortium
between Stulz (plant builder and installer) and CambiAS.

This followed analysis by Dr. Julia Kopp, of hydrolyzed sludge at consultant PCS’ laboratory
from Dec. 05 - Jan. 06, on VS destruction and dewatering.

It was demonstrated that thermally hydrolyzing only the secondary sludge (approximately
half the total) and then mixing it with untreated primary sludge before digestion had a significant
effect on dewaterability of the digested sludge. This has not been demonstrated with other
disintegration technologies. In addition biogas production increased significantly.

The commissioning of the plant was delayed but it is now (spring 2008) in the start up phase.
The goal of the Cambi process is to increase dewaterability from 19% up to 27% DS by the
hydrolysis of secondary sludge only.

The expected benefits of the Cambi process are:

• Better dewatering saves on costs for sludge incineration
• Increased biogas production

Where to find the plant:
Klaranlage Amperverband
Joseph Kistler Weg 20
D-82140 Geiselbullach/Olching
GERMANY