The hidden power of sewage
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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

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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

.

  • 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


1.5 metres long plastic PVC water pipe

plastic box with a watermill

Preliminary Model


Preliminary Model

  • Drawbacks

  • Some water escapes without spinning watermill

  • Some water rebounds back onto the watermill

    • hinder the rotation.


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


Advanced Model


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 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

  • Widely used, especially in big cities like Hong Kong

  • modified and installed in underground pipes to generate electricity


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

  • 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


Thank You!


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