Efforts to Predict BOD for Process Control, 2003 Environmental Conference Proceedings
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For many mills, reliable compliance with both BOD5 and nutrient discharge limits would be greatly aided by a realtime
surrogate that would dependably signal significant shifts in BOD5 loading. For mills addressing water quality based BOD5 discharge limits that vary directly with flow or other conditions of the receiving water, reliable compliance with the varying BOD5 discharge limit would also be greatly aided by a real-time surrogate that would dependably predict the final effluent BOD5 concentration. If future limits for both nutrient and BOD5 discharges are generally lowered, the feasibility of reliably adjusting the biological treatment process to variations in inlet loading
is placed at greater risk, as is the feasibility of reliably generating an effluent with a realistic safety factor below water-quality-based BOD5 limits.
Seven tests of possible BOD5 surrogates have been conducted in recent years at mills. For the normal working range of conditions, reasonable correlations were identified in a few cases. But no surrogate measurements have been identified that reliably alert operators in a timely manner to adjust to normal loading changes. Even for large BOD changes and reasonable overall correlations, surrogate performance could not be considered reliable from a process risk management perspective.