waste disposal Archives - Free ZIMSEC & Cambridge Revision Notes

Water closet/Flush toilet

By garikaib|2025-02-12T09:05:09+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Water Closet. Image credit rakbathware.com ZIMSEC O Level Combined Science Notes: Water closet/Flush toilet

Is part of the water borne sewage
This means that wastes from the toilet are carried by water to a place where it is processed
This is very common in urban homes […]

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Centralised Sewage Treatment Works

By garikaib|2025-02-12T09:06:37+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sewage treatment works at Morton Jaffray,Harare. Image credit hararenews.co.zw ZIMSEC O Level Combined Science Notes: Centralised Sewage Treatment Works

Are used to collect and treat sewage waste from large industrial and residential areas
They treat large quantities of human waste
The raw […]

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Environmental Health: Air pollution

By garikaib|2025-02-12T09:07:53+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Smog in China. Image credit ctvnews.ca ZIMSEC O Level Combined Science Notes: Environmental Health: Air pollution

Urban and industrial areas in Zimbabwe produce waste gases which enter the atmosphere
Often these gases are toxic and contain a high level of smoke particles
A thick haze […]

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Waste disposal

By garikaib|2025-02-12T09:01:40+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Waste disposal in Harare. Image credit thezimbabwedaily.com ZIMSEC O Level Combined Science Notes: Waste disposal

Several terms are used when dealing with waste
Sewage-is the name given to human excrement (faeces and urine) when collected together.
Sewage also includes kitchen waste and industrial waste

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