Safe methods of waste disposal

Which of the following is not a safe method of waste disposal?

• Segregation

• Electrostatic precipitators

• Incineration without pollution control devices

• Composting

Which of the following is not a purpose of incineration?

• Reduces the volume of wastes

• Reduces weight of waste

• Renders toxic waste into less toxic and even non toxic

• To turn marshy land into usable land.

Identify the device for safe disposal of waste.

__________ means putting the waste organic matter to decay so that it can be used for fertilizing the agricultural land.

What is primary treatment ? (of effluent)

• Electricity can be generated from the heat released during burning

• Dissolved chemicals, metals, and pathogens are removed before discharging the treated water into natural bodies or using it for irrigation.

• Micro-organisms in oxidation ponds oxidize organic matter, releasing carbon dioxide and producing sludge for manure.

• Large debris is removed by sedimentation in tanks.