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Chapter 22: Problem 7

Describe three methods of land disposal that were used in the 1970 s. How has their use changed over time?

Short Answer

Expert verified
The three methods of land disposal that were used in the 1970s were incineration, landfills, and ocean dumping. Over time, environmental concerns and technological advancement have modified these methods. Landfills are now designed to prevent contamination, incineration technologies have improved to reduce emissions and often convert waste heat to electricity, and ocean dumping has largely been discontinued due to its environmental impact.

Step by step solution

01

Identify the three common methods of land disposal in the 1970s

The three methods of land disposal used in 1970s were: Landfills, Incineration and Ocean Dumping. Each of these methods was used extensively due to different reasons, mostly based on the type of waste and its impact on the environment.
02

Explain each disposal method

Landfills were created by collecting waste and burying it in large pits. Incineration involved burning waste materials to reduce their volume and mass. Ocean Dumping was the process of discarding waste material into the ocean away from the coastline.
03

Discuss changes in usage over time

Over time, changes in these methods have occurred due to environmental concerns and technology advancement. Landfills are now designed with liners and capped to prevent contamination of surrounding soil and groundwater. Incineration technologies have improved to reduce emissions, and the heat from burning waste is often converted to electricity. Ocean dumping has largely been phased out due to its environmental impact and international agreements regulating marine pollution.

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