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Calculate efficiency of sewage treatment

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A sewage treatment plant influent has a BOD5 value of 310 mg/L. What efficiency must the treatment plant have in order to meet the NPDES BOD5 requirement of less than 30 mg/L? Will this sewage treatment plant need a tertiary treatment stage?

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Solution Summary

The percentage of efficiency needed to meet the required BOD5 values is calculated for a sewage treatment plant.

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% efficiency =[ (310 - 30) / 310] x 100 = 90.32%

Tertiary treatment is ...

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