The Waramurungundi tannery with a wastewater flow of 0.011 m3 · s−1 and a BOD5 of 590 mg · L−1 discharges into the Djanggawul Creek. The creek has a 10-year, 7-day low flow of 1.7 m3 · s−1. Upstream of the Waramurungundi tannery, the BOD5 of the creek is 0.6 mg · L−1. The BOD rate constants (k) are 0.115 day−1 for the Waramurungundi tannery and 3.7 day−1 for the creek. Calculate the initial ultimate BOD after mixing.
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