How does temperature affect BOD levels in wastewater?

Temperature plays a significant role in the biochemical processes that occur in wastewater treatment. In general, higher temperatures can enhance the microbial activity responsible for the breakdown of organic matter, which in turn can lead to increased Biological Oxygen Demand (BOD) levels.

BOD is a measure of the amount of oxygen that bacteria will consume while decomposing organic matter in water. As the temperature rises, the metabolic rates of these microorganisms increase, leading them to consume oxygen at a faster rate. This often results in a higher demand for oxygen as more organic matter is broken down at elevated temperatures. Thus, the correct answer illustrates the direct correlation between temperature and BOD levels.

In contrast, lower temperatures slow down microbial activity, which typically results in decreased BOD levels, as the microorganisms are not as efficient in decomposing organic matter. This understanding of temperature’s impact on BOD is essential for those involved in wastewater treatment, as maintaining optimal conditions can significantly influence the effectiveness of the treatment process.