The Hidden Power of Sewage

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# The Hidden Power of Sewage - PowerPoint PPT Presentation

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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Presentation Transcript

### 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

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

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

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