What effect do aerobic bacteria have on dissolved oxygen in water bodies if domestic wastewater is untreated?

What effect do aerobic bacteria have on dissolved oxygen in water bodies if domestic wastewater is untreated?

• A. They increase dissolved oxygen
• B. They deplete dissolved oxygen
• C. They have no effect on dissolved oxygen
• D. They stabilize dissolved oxygen levels

Answer: (B)

Aerobic bacteria play a significant role in the decomposition of organic matter in water bodies, especially when domestic wastewater is introduced. When wastewater contains organic material, these aerobic bacteria consume the organic matter as a food source through their metabolic processes. This consumption of organic material is coupled with the usage of oxygen dissolved in the water. As aerobic bacteria break down the organic pollutants, they utilize a significant amount of dissolved oxygen in the process. This consumption leads to a reduction in the levels of dissolved oxygen available in the water. When the concentration of dissolved oxygen decreases, it can lead to hypoxic conditions, which are detrimental to aquatic life that relies on adequate levels of oxygen for survival. Consequently, untreated domestic wastewater can create an environment where aerobic bacteria thrive at the cost of the dissolved oxygen needed by fish and other organisms, resulting in depletion of this critical resource.

Aerobic bacteria play a significant role in the decomposition of organic matter in water bodies, especially when domestic wastewater is introduced. When wastewater contains organic material, these aerobic bacteria consume the organic matter as a food source through their metabolic processes. This consumption of organic material is coupled with the usage of oxygen dissolved in the water.

As aerobic bacteria break down the organic pollutants, they utilize a significant amount of dissolved oxygen in the process. This consumption leads to a reduction in the levels of dissolved oxygen available in the water. When the concentration of dissolved oxygen decreases, it can lead to hypoxic conditions, which are detrimental to aquatic life that relies on adequate levels of oxygen for survival. Consequently, untreated domestic wastewater can create an environment where aerobic bacteria thrive at the cost of the dissolved oxygen needed by fish and other organisms, resulting in depletion of this critical resource.