September 2016

Environmental Health: Air pollution

By |2022-09-15T12:37:46+02:00September 15th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Smog in China. Image credit ctvnews.ca

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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Centralised Sewage Treatment Works

By |2022-09-15T12:37:46+02:00September 15th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Sewage treatment works at Morton Jaffray,Harare. Image credit hararenews.co.zw

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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Water closet/Flush toilet

By |2022-09-15T12:37:47+02:00September 14th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Water Closet. Image credit rakbathware.com

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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Blair toilet

By |2022-09-15T12:37:47+02:00September 14th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Blair Toilet. Image credit thestandard.co.zw

Blair Toilet. Image credit thestandard.co.zw ZIMSEC O Level Combined Science Notes: Blair toilet
  • This was developed by the Blair Research Laboratory

The Blair Toilet.

The Blair Toilet.
  • It is a refinement of the pit latrine
  • They use […]

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Pit latrine

By |2022-09-15T12:37:47+02:00September 14th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Pit Latrine. Image credit sswm.info

Pit Latrine. Image credit sswm.info ZIMSEC O Level Combined Science Notes: Pit Latrine
  • It consists of a deep hole in the ground into which all human urine and faeces (excrement) are deposited

A pit latrine

A pit latrine
    […]

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Waste disposal

By |2022-09-15T12:37:48+02:00September 9th, 2016|Notes, O Level Science Notes, Ordinary Level Notes|

Waste disposal in Harare. Image credit thezimbabwedaily.com

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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