Environmental Engineering

Question 1 Not yet answered Marked out of 0.10 P Flag question The Figure below show the typical Water Treatment Unit Processes and Their Arrangement. These processes are typically used for treatment of: Influent from surface water Screen Oxidant/ disinfectant PH control Particulate material Coagulant Rapid mix Water return from filter waste washwater recovery system and solids dewatering Flocculation/ sedimentation Solids to dewatering O Water with high levels of dissolved constituents O Air pollution O Ground water O Surface water Polymer Oxidant disinfectant Granular filtration Filter waste washwater Clear-well storage Effluent to distribution system Filter washwater Water processing Solids processing

Which one of the following best illustrates a nonpoint source of pollution? oil leaking into the ocean from an oil rig ) wastewater from a coal-fired power plant storm-water drainage from the parking lot around a football stadium raw sewage released into a river when storm-water overflows a city's sewage treatment facility

1. A close traverse survey was conducted on the area shown below (figure not to scale). The internal angels obtained during the survey are listed in the table. Determine the azimuths(backward and forward) and bearings (backward and forward) of all the directions if Azimuth of AB =268°.

10. Please identify the lake stratification layers then please describe what happens during spring and fall turnover.

2.8 How many kg/day of NaOH would need to be added to neutralize a waste stream generated by an industry producing 90,800 kg/day of sulfuric acid if 0.1% of the sulfuric acid is lost to the wastewater?The wastewater flow rate is 750,000 L/day.

15. Calculate the volume of an ideal plug flow reactor for the following scenario: *Volumetric flow rate is 6500 m³/day *Species A is being removed according to a first order reaction dCA/dt = -kCA *where A is the concentration of Species A and *k = 9000 d1 *A 95% removal of Species A is required.

Problem 5. A sewer pipe 2 m in diameter is half full of water flowing at an average speed of 1.5m/sec with a BOD of 150 mg/L. The pipe flows into a basin (10,000 m³ volume), which is also fed by a stormwater pipe 1 m in diameter, half-full with water, flowing at 1.0 m/sec and no BOD.The basin has a constant volume, and a single outlet. What is the steady state concentration of BOD in this outlet stream? BOD degrades as a first order kinetics in the basin of 0.9 day'.

1. (15 points) Suppose Monongalia County, which has a population of 105,612 is planning anew landfill that will accept the county's waste for the next 20 years. Assume the county's residents generate an average of 2.0 kg of solid waste per person per day, which is the U.S. average. The county plans to use a ratio of cover and compacted waste to compacted waste of 1.5. If the density of the compacted waste will be 550 kg/m³, what landfill volume is needed to accommodate the county's waste generation for 20 years?

What was the outcome of the hazardous waste episode at Times Beach?(Hint: You will need to do an Internet search.)

Problem 3. A BOD test is run using 100 mL of wastewater and mixed with 200 mL of pure water. The initial DO of the mix is 9.0 mg/L. After 5 days, the DO is 4.0 mg/L. After a long period of time, the DO is 2.0 mg/L and the D0 is no longer changing. Assume nitrification is insignificant (all BOD is carbonaceous). A. What is the BOD5? B. Assuming no nitrification effects, estimate the ultimate carbonaceous BOD. C. What would the BOD remaining be after 5 days? D. Estimate the reaction rate constant k (day')?