The hidden power of sewage
1 / 14

The Hidden Power of Sewage - PowerPoint PPT Presentation

  • Uploaded on

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'The Hidden Power of Sewage' - rhett

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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

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

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