The flow-rate into a lake will be 3,000,000,000 liters per day and flow-rate out is 3,000,000,000 liters per day. The concentration of contaminant in the water flowing in is 0.0001mg/L. The initial volume of the lake is 737,040,000,000 million liters with a current mercury concentration of 0.8 mg/Liter of water. How much time until contaminant levels to drop to 0.0005mg / Liter once the dams have been opened to full capacity. (Assume evaporations rates, ground water recharge nor other environmental conditions do not affect your model.)

The flow-rate into a lake will be 3,000,000,000 liters per day and flow-rate out is 3,000,000,000 liters per day. The concentration of contaminant in the water flowing in is 0.0001mg/L. The initial volume of the lake is 737,040,000,000 million liters with a current mercury concentration of 0.8 mg/Liter of water. How much time until contaminant levels to drop to 0.0005mg / Liter once the dams have been opened to full capacity. (Assume evaporations rates, ground water recharge nor other environmental conditions do not affect your model.)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Question 1: Is the dissolved oxygen level in the pond adequate for the fishes to thrive? Discuss the impact of low DO levels of water to aquatic organisms. Question 2: In typical aquatic environment, when dissolved organic matter is high, dissolved oxygen level tends to be low. Explain why this inverse relationship occurs.
Fifteen kilograms of contaminant is spilled into a stream 5 m wide and 1 m deep. The flow in the river is 2 m3/s, the longitudinal diffusion coefficient is 3 m2/s, and the decay constant is 50 d−1. A) Determine the maximum concentration in the stream at a drinking-water intake 1 km downstream from the spill. B) How would this concentration be affected if the decay constant is actually one- half of the estimated value?
A. 1.22 B. 1.64 C. 2.44 D. 2.68
A municipal wastewater treatment plant processes an average flow of 5000 m³/d. A primary clarifier remove 60% of the suspended solids at average flow. The diameter of the tank is Given: Efficiency Overflow rate (m/m².d) 70 20 40 so
6
A seawater sample has a chlorinity of 2.8 percent. Calculate its salinity in parts-per-thousand (ppt) using Forchhammer’s principle. Show your calculations.
Flow rate: 1.5 m3/s Pollution: pesticide permethrin Lake size: 100m x100m x 2.5m Steady state concentration of permethrin leaving the lake is 1.4 ppm Average cross-sectional area of the river is 2.7 m2. Half-life of permethrin in this environment is 19 hrs. What is the concentration of permethrin entering the lake and what distance downstream of the outlet would the concentration be less than 1 ppm?
A city discharges 100 cumecs of sewage into a river, which is fully saturated with oxygen and flowing at the rate of 1500 cumecs during its lean days with a velocity of 0.1 m/sec. The 5-days BOD of sewage at the given temperature is 280 mg/l. Find when and where the critical D.O. deficit will occur in the downstream portion of the river, and what is its amount. Assume coefficient of purification of the stream (f) as 4.0, and coefficient of deoxygenation (KD) as 0.1.
Find out after how much time only 2% chlorine will remain in the water sample if its half-life is 6 days.
An identified source of irrigation water has ion concentrations of Nat, Catt and Mgt as 20, 10 and 8 mill-equivalent per liter, respectively. The SAR of this water is approximately:
A city wishes to discharge wastewater primary effluent to a river which supports a trout. The state requires the city to show that the trout population is protected. Trout require a minimum of 4 mg/l of dissolved oxygen to survive. Determine the minimum downstream dissolved oxygen concentration from the following information about the wastewater discharge and river. Does the minimum dissolved oxygen concentration meet the requirements? Wastewater discharge=0.45m3/s, river flow rate= 8.5 m3/s, river cross-sectional area=19m2, dissolved Oxygen concentration in the wastewater= 0.2mg/l, dissolved oxygen content of the river upstream = 8.1mg/l, saturation dissolved oxygen concentration at 20 C= 9.0 mg/l, BOD concentration in wastewater = 85 mg/l, BOD concentration upstream in the river= 0.2 mg/l, BOD decay constant = 0.2 d-1, and the reaeration constant for the river= 0.4 d-1.
A desalination plant produces 10,000 m3/day of brine with concentration of 80 g (gram)/L. This brine will be thrown into the ocean. But the concentration has to be lowered to 60 dS/m. How much seawater should be mixed with the brine if the seawater has a salinity of 3%.? Calculate how much salt is in the brine in Tons/day.