Quiz 5: Malfunctions
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1. A malfunction is an accident? *
1 point
2. The anaerobic digestion requires O2-levels of …? *
1 point
3. A high ammonia (NH4) concentration of 1500-3000 mg/L leads to ...? *
1 point
4. A high CO2 content can result in …? *
2 points
Digester problems
Malfunction of the equipment
Higher methane (CH4) levels
Options
5. Reasons for a biogas yield drop are … ?   *
3 points
Drop in quality of substrates
Drop of temperature
Drop of methanogenic bacteria
Options
6. What are relevant actions to prevent a (further) dropping of the biogas yield? *
3 points
Assure substrate mixing and quality
Check heating system
Add digestate from another digester if the methanogenic bacteria drop
Options
7. What are reasons that the methane concentration drops? *
3 points
Drop in quality of substrates
Drop of temperature
Compound inhibition
Options
8. How can the methane concentration dropping be stopped? *
3 points
Assure substrate mixing and quality
Check heating system
Check level of potential inhibitor compounds
Option
9. What are actions are reasonable to act to foaming? *
3 points
Reduce or stop feeding
Reduce air introduction
Analyze substrate
Add water
Options
10. What are relevant actions to stop a pH value dropping? *
2 points
reduce substrate until system returns to normal
use only manure until system returns to normal
shut off the plant and start-up again after 1 day
Options
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