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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

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

How much sewage we Hong Kong people produce each day?

2 6 million cubic metres

X 1400

2.6 million cubic metres!!

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

Preliminary model

1.5 metres long plastic PVC water pipe

plastic box with a watermill

Preliminary Model

The hidden power of sewage

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

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

Advanced Model

The hidden power of sewage

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



  • 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



  • 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

The hidden power of sewage

Thank You!

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