Subject : 

Basic Science and Technology

Term :

First Term


Week 10

Class :

Basic 5 / Primary 5

Previous lesson : 

The pupils have previous knowledge of   types of waste

Topic :


Waste Disposal – disposing refuse or sewage
Effects of Improper Waste Disposal




Behavioural objectives :

At the end of lesson, pupils should be able to:

  • Explain the meaning of waste disposal
  • Say various alternative ways of waste disposal
  • Mention the best method of waste disposal
  • List out the possible effects of not properly disposing our waste


Instructional Materials :

  • Wall charts
  • Pictures
  • Related Online Video
  • Flash Cards
  • Waste Paper Basket

Methods of Teaching :

  • Class Discussion
  • Group Discussion
  • Asking Questions
  • Explanation
  • Role Modelling
  • Role Delegation


Reference Materials :

  • Scheme of Work
  • Online Information
  • Textbooks
  • Workbooks
  • 9 Year Basic Education Curriculum
  • Workbooks


Content :

What is waste disposal  ?

Waste disposal is a method of environmental sanitation that involves  the removal of unwanted
waste like sewage and refuse from our environment for the purpose of keeping
our environment clean, neat and safe from germs .


What are the methods of waste disposal ?
These are the methods of disposing liquid waste like sewage :

(i) Pit latrine

(ii) Water closet


These two systems should be linked to:

(i) a cesspool or

(ij) a septic tank

Cesspool: This is a covered temporary underground container that is used for the
collection of sewage or liquid waste .

Septic tank: This is an underground tank in which sewage is collected and
decomposed by bacteria before being drained.

Pail or Bucket system: This method has been discouraged and is no longer
popular because it is considered unsafe for human health.

Refuse Disposal:
The following methods can be used:

(i) Incineration,

(ii) composting,

(iii) land filling.

Dustbin: This is first used to collect the refuse before the proper disposal.



Effects of Improper Waste Disposal 

  • Water will become contaminated .
  • Land pollution
  • Air pollution
  • Climate change
  • Air pollution
  • Spread of diseases
  • Danger to marine life or aquatic creatures.



The topic is presented step by step


Step 1:

The class teacher revises the previous topics


Step 2.

He introduces the new topic


Step 3:

The class teacher allows the pupils to give their own examples and he corrects them when the needs arise




The class teacher wraps up or conclude the lesson by giving out short note to summarize the topic that he or she has just taught.

The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.

He or she does the necessary corrections when and where  the needs arise.



  • What is waste  disposal
  • Mention four effects of improper waste disposal


Prepare for the next lesson by reading about waste and waste recycling



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