Re: DIG-L: sewage sludge digestion

["AHHM Schomaker" <ts@HASKONING.nl>]

Dear Ingo,

The Cambi-sludge digestion process is known over here and its 
benefits seem to be very clear. In order to convince potential 
customers however, we need additonal detailed information 
regarding:
- mass and energy balance;
- gas production rate;
- VS-removal;
- investments and running costs.

Which data or publications are there available in this respect ?

Kind regards,

Ton Schomaker


Date sent:      	Tue, 22 Feb 2000 13:01:19 +0100
To:             	ts@HASKONING.nl
From:           	Ingo Machenbach <Ingo.Machenbach@bygg.ntnu.no>
Subject:        	Re: DIG-L: sewage sludge digestion

> Dear Mr Schomaker
> 
> Thermal hydrolysis offers you a solution to most of the problems you 
> mentioned. Since the bacterial hydrolysis is usually the rate-limiting step 
> in anaerobic digestion of particulate organic matter, a thermal 
> pretreatment step treating sludge at 160oC for 30 minutes gives you the 
> following advantages:
> 
> 1. accelerated digestion due to the partial solubilisation of particulates
> 2. complete destruction of pathogenic organisms
> 3. higher biogas production
> 4. better bioavailability of biological sludge to anaerobic degradation 
> (destruction of bacterial cells)
> 5. elimination of foaming problems (scum layers are usually produced by 
> bacteria that are destroyed during pretreatment)
> 6. improved dewaterability after digestion
> 
> If the biogas is used in a combined heat and power plant, the exhaust gases 
> from the gas engine can entirely sustain the pretreatment step without 
> losses in electricity production. Heat energy is also recovered within the 
> pretreatment unit to minimize the input of thermal energy.
> 
> For further information, please check my webpage
> 
> 	http://www.ntnu.no/~inm/
> 
> or go directly to Cambi as who build such plants
> 
> 	http://www.cambi.no/
> 
> Fullscale plants have been built in Norway, Denmark, and the UK in recent 
> years.
> 
> Best regards,
> Ingo Machenbach
> 
> 
> ___________________________________________________________________________
> Ingo Machenbach	 			Tel:	+47 73 59 31 20
> PhD student			 		Fax:	+47 73 59 12 98
> NTNU - Norwegian University of Science and Technology
> Department of Hydraulic and Environmental Engineering		
> S.P. Andersensvei 5
> N-7491 Trondheim		 WWW: http://www.ntnu.no/~inm/
> Norway   			 EMILY: http://www.ccwr.ac.za/emily/	
> ____________________________________________________________________________
> 
> 	The great tragedy of Science - the slaying of a beautiful hypothesis by an 
> ugly fact.
> 		(T. H. Huxley)
> 



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