The BOD data given here are a series of tests on a 24-hr composite effluent from a tertiary plant treating domestic wastewater with granular-media filtration after biological aeration. The samples were collected before chlorination so seeding of the bottles was not necessary.
Time, days | 1 | 2 | 3 | 5 | 6 | 9 | 13 | 17 |
BOD, mg/I | 4 | 6.3 | 12.5 | 13.6 | 14.3 | 18.2 | 20.2 | 23.8 |
Graph BOD versus time and locate the 5-day BOD value. Calculate the values of (time/ BOD)1/3, and graph these values versus time to determine k -rate.
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