Chemistry 2001 JAMB Past Questions - Question 13: The pollution from petroleum spillage in rivers and lakes can best be dispersed by

Correct Answer

A

Explanation

The best method for addressing pollution from petroleum spillage in rivers and lakes depends on various factors, and it's important to note that the most effective approach is prevention. However, if a spill has already occurred, the appropriate response may involve a combination of methods. Here are some commonly used techniques:

1. **Containment and Recovery:** This involves using booms and barriers to contain the spread of the oil and then using skimmers and vacuums to recover the spilled oil from the water's surface.

2. **Bioremediation:** This method involves the use of microorganisms to break down and degrade the oil. Certain bacteria and fungi can metabolize hydrocarbons found in petroleum, helping to naturally clean up the environment. However, this process can take time.

3. **Chemical Dispersants:** Chemical dispersants are substances that can break down the oil into smaller droplets, making it more easily dispersed throughout the water column. This can enhance the natural degradation of the oil. However, the use of dispersants is a subject of debate due to potential environmental impacts.

4. **Mechanical Removal:** This involves physically removing oil from affected areas using equipment such as sorbents or absorbent materials.

5. **Natural Attenuation:** Allowing natural processes like evaporation, weathering, and photo-oxidation to break down and disperse the oil. This method is often used in cases where the spill is small, and the environmental conditions are conducive to natural processes.

Using detergents or organic solvents can have harmful effects on aquatic ecosystems and is generally not recommended due to their potential negative impacts on water quality and aquatic life.

The choice of response method depends on factors such as the size and type of the spill, environmental conditions, and the sensitivity of the affected area. In many cases, a combination of these methods is employed to address different aspects of the spill. Additionally, involving trained professionals and following regulatory guidelines is crucial to ensure an effective and environmentally responsible response.