What percent of TSS/BOD can a secondary treatment system achieve?

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Multiple Choice

What percent of TSS/BOD can a secondary treatment system achieve?

Explanation:
Secondary treatment is meant to substantially reduce the amount of biodegradable organics and suspended solids in wastewater using biological processes and solids settling. Because of the way these systems operate—biological degradation of BOD and efficient separation of solids—the typical removal efficiency falls in the high 80s up to the mid-90s percent for both BOD and TSS. So, 85–95 percent is the standard expectation for what a secondary system can achieve. Lower ranges would indicate underperformance or a system that isn’t operating at secondary level, while the 85–95% range captures the common performance of activated sludge or other secondary processes under normal operating conditions.

Secondary treatment is meant to substantially reduce the amount of biodegradable organics and suspended solids in wastewater using biological processes and solids settling. Because of the way these systems operate—biological degradation of BOD and efficient separation of solids—the typical removal efficiency falls in the high 80s up to the mid-90s percent for both BOD and TSS. So, 85–95 percent is the standard expectation for what a secondary system can achieve. Lower ranges would indicate underperformance or a system that isn’t operating at secondary level, while the 85–95% range captures the common performance of activated sludge or other secondary processes under normal operating conditions.

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