Energy

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