Ch. 27 - Environmental Microbiology

Tortora - Microbiology: An Introduction 14th Edition

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Tortora 14th Edition

Ch. 27 - Environmental Microbiology

Problema 9

Capitolo 23, Problema 9

All of the following are effects of water pollution except
a. The spread of infectious diseases.
b. Increased eutrophication.
c. Increased BOD.
d. Increased growth of algae.
e. None of the above; all of these are effects of water pollution.

Guida verificata passo dopo passo

Step 1: Understand the context of water pollution and its common effects. Water pollution typically leads to the introduction of harmful substances or microorganisms into water bodies, which can impact ecosystems and human health.

Step 2: Review each option to determine if it is a known effect of water pollution. For example, the spread of infectious diseases (option a) can occur due to contaminated water carrying pathogens.

Step 3: Consider eutrophication (option b), which is the excessive growth of algae and aquatic plants caused by increased nutrients like nitrogen and phosphorus from pollutants.

Step 4: Analyze the concept of Biological Oxygen Demand (BOD) (option c), which increases when organic pollutants in water are decomposed by bacteria, consuming oxygen and reducing water quality.

Step 5: Evaluate the increased growth of algae (option d), which is a direct consequence of eutrophication and nutrient pollution in water bodies.

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Water Pollution and Its Sources

Water pollution occurs when harmful substances contaminate water bodies, affecting aquatic life and human health. Common pollutants include pathogens, chemicals, and nutrients from industrial, agricultural, and domestic sources.

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Introduction to Water

Biochemical Oxygen Demand (BOD)

BOD measures the amount of oxygen required by microorganisms to decompose organic matter in water. Increased BOD indicates higher organic pollution, which can deplete oxygen levels and harm aquatic organisms.

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Reactive Oxygen Species

Eutrophication and Algal Growth

Eutrophication is the nutrient enrichment of water bodies, often from excess nitrogen and phosphorus, leading to excessive algae growth. This can cause oxygen depletion, harming aquatic ecosystems and promoting harmful algal blooms.

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Growth Factors

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The following processes are used in wastewater treatment. Match the stage of treatment with the processes. Each choice can be used once, more than once, or not at all.

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Coliforms are used as indicator organisms of sewage pollution because

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e. All of the above.

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