3. Just below the point where a continuous discharge of pollution mixes with a river, the BOD is 10.9 mg/L, and DO is 7.6 mg/L. The river and waste mixture has a temperature of 20°C, a deoxygenation constant kd of 0.20/day, an average flow speed of 0.30 m/s, and a average depth of 3.0 m. a. Find the time and distance downstream at which the oxygen deficit is at a maximum. b. Find the minimum value of DO.

3. Just below the point where a continuous discharge of pollution mixes with a river, the BOD is 10.9 mg/L, and DO is 7.6 mg/L. The river and waste mixture has a temperature of 20°C, a deoxygenation constant kd of 0.20/day, an average flow speed of 0.30 m/s, and a average depth of 3.0 m. a. Find the time and distance downstream at which the oxygen deficit is at a maximum. b. Find the minimum value of DO.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Integrated Solid Waste Management

Integrated Solid Waste Management (ISWM) is a thorough waste suppression, compost, removal and recycling Program. An effective ISWM system considers how to suppress, manage and recycle solid waste in a manner that is most efficiently to protect human health and the surrounding. ISWM system requires evaluation of public wants and demands and then selecting and merging the most effective waste management activities for the proposed demands. The main ISWM activities for solid waste management are Waste prevention, Recycling and Composting, and Combustion and Removal and waste collection in a properly planned, constructed, managed and mitigated landfill areas. Each of these requires careful designing, financing, accumulation, and delivery of activities.

Question

3. Just below the point where a continuous discharge of pollution mixes with a river, the BOD is 10.9
mg/L, and DO is 7.6 mg/L. The river and waste mixture has a temperature of 20°C, a deoxygenation
constant kd of 0.20/day, an average flow speed of 0.30 m/s, and a average depth of 3.0 m.
a. Find the time and distance downstream at which the oxygen deficit is at a maximum.
b. Find the minimum value of DO.

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Please ans a and b