Homework 7 due december 12
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This document contains 4 homework problems related to environmental engineering: 1) Calculating the minimum pond volume needed to achieve 80% BOD removal for a 1.0 MGD flow based on given conditions. 2) Estimating the ultimate BOD downstream of a wastewater treatment plant discharge into a receiving stream given effluent BOD, stream flows and BODs. 3) Calculating the soil volume required to cover 6,000 tons of municipal solid waste based on a given waste-to-soil ratio and waste density. 4) Estimating the average moisture content in a municipal solid waste stream based on given composition percentages and moisture contents for different components.
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This lab course focuses on practicing basic water quality analysis methods. Students will determine quality parameters of water and wastewater samples using gravimetric, volumetric, and spectrophotometric techniques. Parameters tested include alkalinity, hardness, solids, BOD, COD and more. The course aims to provide hands-on experience in laboratory procedures for water and wastewater treatment. Students will be assessed based on lab reports, quizzes, a midterm exam, and a final exam.Ad
Homework 7 due december 12
- 1. EG-CE 441 Environmental Engineering Homework #7 (Due 12/12/2013) 1. A stabilization pond treats a flow of 1.0 MGD. To achieve 80% removal of BOD, the kt value was determined to be 2.5. Determine the minimum pond volume ( in MGAL) using the following conditions: Winter liquid temperature = 15 oC Over-all 1st order BOD removal rate constant (k) = 0.25/d at 20 oC The temperature coefficient = 1.06 2. A secondary treated effluent from a 4-MGD wastewater treatment plant is discharged into a receiving stream. The wastewater has a BOD5 of 20 mg/L. The receiving stream upstream from the point of wastewater discharge has a flow rate of 18 cfs (11.6 MGD) and a BOD5 of 4.0 mg/L. The BOD reaction rate constant is estimated to be 0.23/d (base e at 20 oC). Reaeration and deoxygenation are the only major factors affecting the DO concentration in the stream after mixing with wastewater effluent. Estimate the ultimate BOD just downstream of the effluent discharge into the receiving stream. 3. Assume a waste-to-soil cover volume ratio of 10:1 for a municipal solid-waste landfill (MSWLF). The average unit density of the waste as deliver to the landfill is 300 lbm/yd3 and the compaction ratio at the landfill is 0.30. Estimate the volume of soil (yd3 in place) required covering 6,000 tons of the incoming waste. 4. You are to evaluate the impact of moisture in a municipality's solid waste stream on their processing and disposal systems. Estimate the moisture content in the average waste stream. Component Organics Food wastes Paper Cardboard Plastics Textiles Rubber Leather Yard wastes Wood Inorganics Glass Metals Dirt, Ash, etc. Total MSW Composition (As collected) % by wt. Average Moisture (% by wt.) 8 39 6 5 2.5 1 0.3 20.5 3 65 7 6 2.5 10.5 2.5 10 55 27.5 6 5.7 3 100 2.5 3.0 9.0