This document summarizes a panel discussion on operational performance and additives for plant stability in anaerobic digestion. The panel was chaired by Dr. Hugh Bulson and included experts from Kemira Kemi AB, Xergi, Schaumann Bioenergy, and JF Temple & Son. Dr. Thomas Fritz from Schaumann Bioenergy presented on common digester problems like foaming and acidification. He discussed economic impacts of deficiencies and how tailor-made additive mixtures can optimize substrate degradation. The presentation covered enzymatic actions of additives to improve digestibility, prevent energy losses and toxic conversions, and reduce protein degradation.

1. OPERATIONAL PERFORMANCE –
ADDITIVES AND PLANT STABILITY
#UKADBiogas @adbioresources
CHAIR:
DR HUGH BULSON, ORA
PANEL:
BRITT NILSSON, KEMIRA KEMI AB
JØRGEN FINK, XERGI
DR THOMAS FRITZ, SCHAUMANN BIOENERGY
DR STEPHEN TEMPLE, JF TEMPLE & SON

2. by
Dr.-Ing. Thomas Fritz
Seminar at UK AD & Biogas Show 2015
NEC Birmingham
Common digester problems /
Derivation – Symptoms – Approaches

3. 3

4. Expertise
products consulting analytic
4
Anaerobic digestion

5. Common digester problems
Foaming
increasing viscosity
Increasing VFA/TIC
value
low methane yield
Acidification

6. 6Dr.-Ing. Thomas Fritz, 2013

7. 7Dr.-Ing. Thomas Fritz, 2013

8. 8Dr.-Ing. Thomas Fritz, 2013

9. Common problems of biogas plant biology
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10
0
500
1000
1500
2000
2500
pH,feedinput[t/d]
volatilefatacid[mg/l]
acetic acid [mg/l]
propionic acid [mg/l]
pH
feed input [t/d]

10. Economic impact of AD deficiencies
10

11. organic
conservation
additives
biological silage
additives
specialised
enzyme-mixtures
tailor made
micronutrient and
additive mixtures
precipitating agent
11

12. Tailor-made additive mixtures for the optimisation of the anaerobic
substrate degradation in a patented process
12

13. The main goals
for the use of silage agents in biogas silages
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pre-treatmant
(promotion of digestibility)
against
energy losses
against
toxic
conversion processes
against
protein degradation+ +
+

14. Manner of the enzymatic action
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1st group of enzymes: ripping of fibres
2nd group of enzymes :
splitting of molecules

15. &
Expertise in anaerobic digestion
You can find us at:
Stand number:
F401

16. OPERATIONAL PERFORMANCE –
ADDITIVES AND PLANT STABILITY
#UKADBiogas @adbioresources
CHAIR:
DR HUGH BULSON, ORA
PANEL:
BRITT NILSSON, KEMIRA KEMI AB
JØRGEN FINK, XERGI
DR THOMAS FRITZ, SCHAUMANN BIOENERGY
DR STEPHEN TEMPLE, JF TEMPLE & SON