Within what range does ammonia concentration become inhibitory in an anaerobic digester?

Study for the GWWI WEF Wastewater Treatment Fundamentals Test. Review key concepts with flashcards and multiple-choice questions, complete with hints and explanations. Prepare to ace your exam!

Ammonia concentration becomes inhibitory in an anaerobic digester primarily due to the toxic effects of free ammonia, particularly in elevated concentrations. Within the range of 1500 to 3000 mg/L, free ammonia levels can significantly disrupt the metabolic activities of methanogenic microorganisms, which are crucial for the anaerobic digestion process.

When ammonia concentrations reach this level, it can lead to decreased biogas production and can impair the overall efficiency of the digestion process. Methanogens are particularly sensitive to ammonia, as it can inhibit enzymatic processes and cause stress that reduces their activity. This understanding is essential for operators of anaerobic digesters, as maintaining ammonia levels within acceptable limits is critical for optimal performance and the effective breakdown of organic materials.

Options outside this range, either lower or higher, do not reflect the threshold where ammonia's inhibitory effects significantly impact digestion. Therefore, recognizing the specific range of 1500 to 3000 mg/L helps in managing the health of the anaerobic digester and ensuring effective wastewater treatment operations.

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