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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.

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

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

### 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!