Energy

3. Starchy crops may have to be pretreated with these before fermentation can proceed
4. process by which sugar is converted to alcohol
5. type of processing where raw materials are constantly added and product constantly being removed
7. a by product of fermentation
9. organic material produced by green plants that can be used as an energy source
10. substrate for production of biogas in sewage works
11. a gas produced from the decay of remains of animals and plants
13. a natural substrate for the production of ethanol as fuel
14. animal waste produced from intensive farming techniques

1. conditions required for production of biogas
2. ethanol and petrol mixture
3. container dug into the ground to collect animal and domestic waste and produce biogas
6. large pits lined with clay where rubbish is deposited.
8. type of processing with all raw materials needed inside an enclosed container at start
12. Zymomonas mobilis can tolerate high levels of ethanol and is this type of micro-organism