The discharge from the Renenutet sugar beet plant causes the DO at the critical point to fall to 4.0 mg · L−1. The Meskhenet Stream has a negligible BOD and the initial deficit after the river and wastewater have mixed is zero. What DO will result if the concentration of the waste (Lw) is reduced by 50%? Assume that the flows remain the same and that the saturation value of DO is 10.83 mg · L−1 in both cases.
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