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The Hidden Power of Sewage. St. Paul’s Co-educational College. Lo Ka Shun, Parco Tsang Tin Ki, Angela Wong Ho Gan, Albert Poon Wing Yiu, Sarah. How much sewage we Hong Kong people produce each day?. X 1400. 2.6 million cubic metres!!. Working Principle.

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the hidden power of sewage

The Hidden Power of Sewage

St. Paul’s Co-educational College

Lo Ka Shun, Parco

Tsang Tin Ki, Angela

Wong Ho Gan, Albert

Poon Wing Yiu, Sarah

working principle
Working Principle

.

  • Utilize kinetic energy of running sewage
  • Sewage rushes down along the pipes outside buildings
  • Large kinetic energy spin a watermill

A dynamo changes kinetic energy to electricity

slide6

Preliminary Model

  • Drawbacks
  • Some water escapes without spinning watermill
  • Some water rebounds back onto the watermill
    • hinder the rotation.
advanced model

2.Slightly tilted plane

1.top and bottom each have a hole for the entry and exit of water

3.An arc is craved for the watermill to tuck in

4.space below the watermill is enlarged

Advanced Model
output power
Output Power
  • Measuring Setup:
    • An electronic water pump
    • Amount of water pumped to our model is kept at a constant
      • Water velocity

=0.4516 m/s²

    • AC-DC transformer in our advanced model
output power1
Output Power
  • Procedures:
    • Substituted the resistor and
    • re-measure the current and voltages
    • calculate output power
  • Output voltage is very stable
  • ~5 batteries

X 5

applications
Applications
  • Widely used, especially in big cities like Hong Kong
  • modified and installed in underground pipes to generate electricity
further improvement
Further Improvement
  • Further Investigation on
    • How many of our device is to be installed in a pipe outside a building
    • What interval between devices can achieve the maximum electrical output
  • Further develop:
    • Use lighter material to make the watermill
    • Use a more corrosion resistance material
conclusion
Conclusion
  • clean, inexpensive energy resource.
  • easy to build
  • applying this alternative energy resource in a large scale,
  • the reliance on burning fossil fuels for energy
  • environmental damage, e.g. global warming
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