What can be concluded about microorganism activity when SOUR levels are high?

When the levels of Substrate Oxygen Uptake Rate (SOUR) are high, it indicates that microorganisms are consuming a significant amount of substrate and utilizing oxygen at an elevated rate. This heightened activity reflects a robust population of microorganisms that are actively engaged in the breakdown of organic matter.

High SOUR levels suggest a vigorous metabolic process, as microorganisms convert organic compounds into simpler substances, often resulting in increased rates of respiration and growth. This scenario aligns with typical functioning in treatment systems where biodegradation is essential for effective wastewater treatment. Ultimately, high SOUR levels serve as a clear indication of enhanced microbial activity, making it essential for maintaining the efficiency of biological treatment processes.

In contrast, low microbial populations or reduced biological activity would typically coincide with low SOUR levels, indicating inadequate or ineffective treatment efforts. Thus, the high SOUR levels directly correlate with increased microbial activity.