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QUESTION 1 A river flows at 25 ML/d. It has a Chemical X concentration of 1...
A city discharges 16,000 m3/d of treated wastewater into a nearby river. The treated wastewater has...
A city discharges 16,000 m3/d of treated wastewater into a nearby river. The treated wastewater has a BOD5 of 12 mg/L and k of 0.12 d-1 at 20oC. The river has a flow rate of 0.43 m3/s and an ultimate BOD of 5.0 mg/L. The DO of the river is 6.5 mg/L and the DO of the wastewater is 0 mg/L. Compute the DO and initial ultimate BOD after mixing.
A paper mill is in operation near Saguenay river. The mill discharges 3.8 cfs (ft3/s) of...
A paper mill is in operation near Saguenay river. The mill discharges 3.8 cfs (ft3/s) of wastewater directly into the Saguenay river. The mill is getting half of this water from an intake which is located 0.5 miles upstream of the wastewater outfall of the mill, and the other half from a nearby well field. On the average, the water upstream of paper mill has TSS concentration of 2.5 mg/L. If the Saguenay river has a flow of 12 cfs...
1. Some pond water contains 20.O mg/L of some algae, which can be represented by the chemical for...
1. Some pond water contains 20.O mg/L of some algae, which can be represented by the chemical formula CsHisO&N. Using the following reactions: CoHisO&N606CO2 6H2ONHa NHs 202 NOs H2O (a) Find the theoretical carbonaceous oxygen demand CBOD (b) Find the nitrogenous oxygen demand NBOD (c) Find the total theoretical biochemical oxygen demand BOD 2. A sandy soil has a hydraulic conductivity of 6.1 x104 m/d, a hydraulic gradient of 0.00141, and porosity of 20%. (a)what is the Darcy velocity (b)what...
(Total: 36 pts) Suppose a chemical factory discharges waste product into a river resulting in significant...
(Total: 36 pts) Suppose a chemical factory discharges waste product into a river resulting in significant damages to a local fishery. The marginal damage to the fishery (measured in terms of the value of lost fish stocks) is represented by the equation: MD = 10E The chemical factory can reduce its effluent flows by treating its waste products. Its marginal abatement cost (MAC) function is given by the equation: MAC = 1,200 - 5E. d) (8pts) If the chemical factory...
7. You work for the Ministry of Environment to evaluate the maximum ultimate BOD concentration in...
7. You work for the Ministry of Environment to evaluate the maximum ultimate BOD concentration in the effluent of a new wastewater treatment plant such that the oxygen deficit never exceeds 1.5 mg/L in the receiving river. During dry weather (i.e., lowest river flow), the wastewater will be diluted 10 times in the river water and the river water contains 3.5 mg/L of ultimate BOD. Also during dry weather, you know that the river velocity after the wastewater discharge would...
Incorrect Question 9 0/1 pts A water sample is contaminated by benzene at a concentration of...
Incorrect Question 9 0/1 pts A water sample is contaminated by benzene at a concentration of 40 mg/L. If you have only 20 g of activated carbon, what is the volume of water (in mL) that can be treated to the final concentration of 5 mg/L. The Freundlich isotherm coefficients are K = 5 and n = 2.5 for concentrations in g/L. 205 mL 343 mL 292 mL 505 mL
5. A river with 20 ppm of a non-conservative (reactive) substance and an upstream flow of...
5. A river with 20 ppm of a non-conservative (reactive) substance and an upstream flow of 25 m/s receives an agricultural discharge of 5 m/s carrying 2000 ppm of the same reactive substance. The chemical in the agricultural stream mix instantaneously with the main river flow. The reactive substance has a first-order decay rate of 0.25/day and the river has a cross sectional area of 20 mperpendicular to the direction of flow. A municipality located 40 km downstream of the...
The East Hartford WWTP discharges 150 MGD of treated wastewater into the CT river. The treated was tested in the lab and found to have aBOD5 of 17.5 mg/L and an ultimate BOD (Lo) of 92 mg/L at 20oC....
The East Hartford WWTP discharges 150 MGD of treated wastewater into the CT river. The treated was tested in the lab and found to have aBOD5 of 17.5 mg/L and an ultimate BOD (Lo) of 92 mg/L at 20oC. Find the reaction rate K, for the treated wastewater. The CT river has a flow of 250 m2/s and an ultimate BOD (Lo) of 6 mg/L. the DO of the river is 4.5 mg/L and the DO of the wastewater is0.2...
Ml of river water with BODs of 1000 ppm is diluted to 1 L, aerated and seeded. The If 2 disolved ...
ml of river water with BODs of 1000 ppm is diluted to 1 L, aerated and seeded. The If 2 disolved oxygen content was 7.8 mg/L initially. After 20 days, the dissolved oxygen ssolv content had dropped to 5.3 mg/L. What is the ultimate BOD, and remaining BOD? Which of the two BODs give better prediction of BODL, and why?
ml of river water with BODs of 1000 ppm is diluted to 1 L, aerated and seeded. The If 2...
ENCE 3327 13/2 lake with an 18-km' surface area has an inflow of 10 m's from several streams with...
ENCE 3327 13/2 lake with an 18-km' surface area has an inflow of 10 m's from several streams with an average phosphorus (P) concentration of 0.02 mg/L. A municipal wastewater plant discharges its treated cfluent to the lake at 0.05 m/s with a P concentration of 10 mg/L. Assuming the P settling rate is 5 cm/d, determine. ath state concentration in the lake, and b) the P % removal necessary in the incomin a P steady-state concentration in the lake...
A paper mill is in operation near Saguenay river. The mill discharges 3.8 cfs (ft3/s) of wastewater directly into the Saguenay river. The mill is getting half of this water from an intake which is located 0.5 miles upstream of the wastewater outfall of the mill, and the other half from a nearby well field. On the average, the water upstream of paper mill has TSS concentration of 2.5 mg/L. If the Saguenay river has a flow of 12 cfs...
1. Some pond water contains 20.O mg/L of some algae, which can be represented by the chemical formula CsHisO&N. Using the following reactions: CoHisO&N606CO2 6H2ONHa NHs 202 NOs H2O (a) Find the theoretical carbonaceous oxygen demand CBOD (b) Find the nitrogenous oxygen demand NBOD (c) Find the total theoretical biochemical oxygen demand BOD 2. A sandy soil has a hydraulic conductivity of 6.1 x104 m/d, a hydraulic gradient of 0.00141, and porosity of 20%. (a)what is the Darcy velocity (b)what...
7. You work for the Ministry of Environment to evaluate the maximum ultimate BOD concentration in the effluent of a new wastewater treatment plant such that the oxygen deficit never exceeds 1.5 mg/L in the receiving river. During dry weather (i.e., lowest river flow), the wastewater will be diluted 10 times in the river water and the river water contains 3.5 mg/L of ultimate BOD. Also during dry weather, you know that the river velocity after the wastewater discharge would...
Incorrect Question 9 0/1 pts A water sample is contaminated by benzene at a concentration of 40 mg/L. If you have only 20 g of activated carbon, what is the volume of water (in mL) that can be treated to the final concentration of 5 mg/L. The Freundlich isotherm coefficients are K = 5 and n = 2.5 for concentrations in g/L. 205 mL 343 mL 292 mL 505 mL
5. A river with 20 ppm of a non-conservative (reactive) substance and an upstream flow of 25 m/s receives an agricultural discharge of 5 m/s carrying 2000 ppm of the same reactive substance. The chemical in the agricultural stream mix instantaneously with the main river flow. The reactive substance has a first-order decay rate of 0.25/day and the river has a cross sectional area of 20 mperpendicular to the direction of flow. A municipality located 40 km downstream of the...
ml of river water with BODs of 1000 ppm is diluted to 1 L, aerated and seeded. The If 2 disolved oxygen content was 7.8 mg/L initially. After 20 days, the dissolved oxygen ssolv content had dropped to 5.3 mg/L. What is the ultimate BOD, and remaining BOD? Which of the two BODs give better prediction of BODL, and why?
ml of river water with BODs of 1000 ppm is diluted to 1 L, aerated and seeded. The If 2...
ENCE 3327 13/2 lake with an 18-km' surface area has an inflow of 10 m's from several streams with an average phosphorus (P) concentration of 0.02 mg/L. A municipal wastewater plant discharges its treated cfluent to the lake at 0.05 m/s with a P concentration of 10 mg/L. Assuming the P settling rate is 5 cm/d, determine. ath state concentration in the lake, and b) the P % removal necessary in the incomin a P steady-state concentration in the lake...
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