February 2025

Waste disposal

By |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 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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Water closet/Flush toilet

By |2025-02-12T09:05:09+02:00February 12th, 2025|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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Centralised Sewage Treatment Works

By |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 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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