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Methods of waste disposal

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OCEAN DUMPING
Advantages:
  • convenient
  • inexpensive
  • source of nutrients, shelter and breeding
 Disadvantages:
  • ocean overburdened
  • destruction of food sources
  • killing of plankton
  • desalination
SANITARY LANDFILL
Advantages:
  • volume can increase with little addition of people/equipment
  • filled land can be reused for other community purposes
Disadvantages:
  • completed landfill areas can settle and requires maintenance
  • requires proper planning, design, and operation
INCINERATION
Advantages:
  • requires minimum land
  • can be operated in any weather
  • produces stable odor-free residue
  • refuse volume is reduced by half
Disadvantages:
  • expensive to build and operate
  • high energy requirement
  • requires skilled personnel and continuous maintenance
  • unsightly - smell, waste, vermin
OPEN DUMPING
Advantages:
  • inexpensive
Disadvantages:
  • health-hazard - insects, rodents etc.
  • damage due to air pollution
  • ground water and run-off pollution
RECYCLING
Advantages:
  • key to providing a liviable environment for the future
Disadvantages:
  • expensive
  • some wastes cannot be recycled
  • technological push needed
  • separation of useful material from waste difficult

 

http://www.gdrc.org/uem/waste/disposal.html

Take a look at the product cycling charts (A and B). Give your comments on one of the charts.

A B

12 You are going to participate in the conference “Clean our planet!”. Your report is about different methods of waste disposal. Prepare your speech on the base of the chart below and present it to your group-mates.

PROJECT WORK

“Waste disposal”

Design a Power Point slide about waste disposal of your manufacture and prepare a short presentation.

WRITING

14 You are going to participate in the conference “Clean our planet!”. Your report is about methods of chemical waste disposal. Write down the report.

CHECKLIST

Assess your progress in this unit. Tick (ü) the statements which are true.

  I know how to deal with different kinds of waste.
  I can talk about different methods of waste disposal.
  I can use search skills to know how to deal with the waste of my production.

UNIT 15

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Читайте в этой же книге: Fill in the correct word from the list below and make up the sentences with these phrases. | Match the sub-fields of material science with the definitions. | Chemical engineering | Fill in the gaps with the appropriate word from the list below. | Chemistry Laboratory Safety Rules | Chemistry Laboratory Safety Quiz | Match safety equipment with those in pictures. | Using the suffixes below form the words in the table from the given ones. Use each suffix only ones. | Scan the article and find answers for the questions. | Use the words given in capitals to form the words that fit in the spaces. |
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