Energy

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Across
  1. 3. a natural substrate for the production of ethanol as fuel
  2. 4. large pits lined with clay where rubbish is deposited.
  3. 7. Starchy crops may have to be pretreated with these before fermentation can proceed
  4. 10. Zymomonas mobilis can tolerate high levels of ethanol and is this type of micro-organism
  5. 12. type of processing where raw materials are constantly added and product constantly being removed
  6. 13. substrate for production of biogas in sewage works
  7. 14. animal waste produced from intensive farming techniques
  8. 15. a by product of fermentation
Down
  1. 1. organic material produced by green plants that can be used as an energy source
  2. 2. process by which sugar is converted to alcohol
  3. 5. container dug into the ground to collect animal and domestic waste and produce biogas
  4. 6. type of processing with all raw materials needed inside an enclosed container at start
  5. 8. ethanol and petrol mixture
  6. 9. conditions required for production of biogas
  7. 11. a gas produced from the decay of remains of animals and plants