A river is sampled at point A. The following results are measured: ultimate BOD=25 mg/L, dissolved...
A river is sampled at point A. The following results are measured: ultimate BOD=25 mg/L, dissolved oxygen= 6.5 mg/L, dissolved oxygen at saturation = 10.5 mg/L, deoxygenation rate=0.15 d-1, reaeration rate=0.35 d-1, stream velocity= 0.5 m/s. In how many days is the critical point downstream of Point A?
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A river is sampled at point A. The following results are
measured: ultimate BOD=25 mg/L, dissolved...
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...
QUESTION 3 a) After a point of wastewater discharge, the dissolved oxygen (DO) concentration is found...
QUESTION 3 a) After a point of wastewater discharge, the dissolved oxygen (DO) concentration is found as 83.33% of the saturation DO. The remaining BOD after 5 days at the point of discharge is 10.13 mg/L. The BOD rate constant determined in the laboratory under standard conditions is 0.115/day. The saturation DO concentration in the river water is 9 mg/L. The deoxygenation and the reaeration rate coefficients are 0.25/day and 0.45/day, respectively. The river travels at a velocity of 0.12...
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...
is proposed to discharge a wastewater to a small river (wastewater and river characteristics given below)....
is proposed to discharge a wastewater to a small river (wastewater and river characteristics given below). The temperature of the river and wastewater i and velocity downstream of the discharge is 1.5 m/s. Saturation DO concentr:a 25°C is 8.2 mg/L 2. It s 25°C, Wastewater 1.5 w 31.5 6.1 River Parameter Flow (m/s) BODu( mg/L) DO (mg/L) negligible 8.0 kra20c 0.41 day kd@20c = 0.26 day. Determine: a. Ultimate BOD just downstream of the point of discharge (8 pts) b....
Determine the minimum dissolved oxygen (DO) concentration in a river downstream from a wastewater treatment plant (W...
Determine the minimum dissolved oxygen (DO) concentration in a river downstream from a wastewater treatment plant (WWTP) discharging at a flow rate of 5.00 million gallons per day (MGD). The WWTP achieves secondary treatment standards (BOD5 = 30 mg/L). The wastewater temperature is 25.0 °C and contains 4.0 mg/L of DO. The characteristics of the river upstream from the point of discharge are Q=20.0 cubic feet per second (cfs), T = 20.0°C, BODu = 3.0 mg/L. and DO = 7.0...
Please answer #5 4. What is the theoretical oxygen demand for a wastewater flow of 25...
Please answer #5
4. What is the theoretical oxygen demand for a wastewater flow of 25 MGD (million gallons per day) containing 100 mg/L ethanol (C2H5OH)? 5. If this wastewater was discharged into a stream flowing at 10 m/s with an ultimate BOD of 5 mg/L, dissolved oxygen (DO) of 5mg/L, and deoxygenation rate coefficient ka of 0.2/day: (a) Find ultimate BOD of mixture just downstream of wastewater discharge. State all assumptions used. (b) In your opinion, is the wastewater...
Seawater+Wastewater mixing (Water pollution)
Example 7.15: According to the following information, determine whether a fish, which requires 6 \(\mathrm{mg} / \mathrm{L}\) dissolved oxygen, would survive in the river.Given:Waste water flow rate \(\left(\mathrm{Q}_{w}\right)=1.2 \mathrm{~m}^{3} / \mathrm{s}\)River flow rate \(\left(\mathrm{Q}_{r}\right)=10 \mathrm{~m}^{3} / \mathrm{s}\)River temperature \(\left(T_{r}\right)=15^{\circ} \mathrm{C}\)River ultimate \(\mathrm{BOD}\left(\mathrm{BOD}_{r}\right)=2.3 \mathrm{mg} / 1\)River reaeration rate \(=0.4\) per day for BOD testBOD concentration was initially \(9 \mathrm{mg} / \mathrm{l}\), after 5 days was \(6 \mathrm{mg} / 1\) and after an indefinitely long period of time was \(2.5 \mathrm{mg} /...
The following ultimate CBOD data were measured in a stream. Find the deoxygenation 3. rate constant,...
The following ultimate CBOD data were measured in a stream. Find the deoxygenation 3. rate constant, Kd. 4.5 8.2 9.6 0.75 11.1 0.5 12.9 0.25 14.1 0.1 L, mg/ 15 t, days0
A stream flowing with a velocity of 2 mph contains no BOD, but has an oxygen deficit of 6 mg/1. T...
A stream flowing with a velocity of 2 mph contains no BOD, but has an oxygen deficit of 6 mg/1. Ten miles downstream this deficit has been reduced to 4 mg/l through adsorption from the atmosphere. The stream conditions are uniform throughout its length. Assume the rate of aeration is proportional to the deficit. (a) calculate the rate "k" (b) calculate the deficit 35 miles downstream from the original starting point **Bonus (c) plot the function using Excel to graphically...
QUESTION 1 6 point City of Hope's Wastewater has a ultimate carbonaceous BOD of 300 mg/L...
QUESTION 1 6 point City of Hope's Wastewater has a ultimate carbonaceous BOD of 300 mg/L at 20 oC. The reaction rate k at that temperature has been determined to be 0.2/day. a) Find the BOD5. b)Find the reaction rate coefficient at 15 oC. c) Find BOD5 at 15 oC. O 132 mg/L, 0.18/day, 265 mg/L O 190 mg/L, 0.16/day, 165 mg/L O90 mg/L, 0.16/day, 245 mg/L O 232 mg/L, 0.18/day, 365 mg/L
QUESTION 3 a) After a point of wastewater discharge, the dissolved oxygen (DO) concentration is found as 83.33% of the saturation DO. The remaining BOD after 5 days at the point of discharge is 10.13 mg/L. The BOD rate constant determined in the laboratory under standard conditions is 0.115/day. The saturation DO concentration in the river water is 9 mg/L. The deoxygenation and the reaeration rate coefficients are 0.25/day and 0.45/day, respectively. The river travels at a velocity of 0.12...
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...
is proposed to discharge a wastewater to a small river (wastewater and river characteristics given below). The temperature of the river and wastewater i and velocity downstream of the discharge is 1.5 m/s. Saturation DO concentr:a 25°C is 8.2 mg/L 2. It s 25°C, Wastewater 1.5 w 31.5 6.1 River Parameter Flow (m/s) BODu( mg/L) DO (mg/L) negligible 8.0 kra20c 0.41 day kd@20c = 0.26 day. Determine: a. Ultimate BOD just downstream of the point of discharge (8 pts) b....
Determine the minimum dissolved oxygen (DO) concentration in a river downstream from a wastewater treatment plant (WWTP) discharging at a flow rate of 5.00 million gallons per day (MGD). The WWTP achieves secondary treatment standards (BOD5 = 30 mg/L). The wastewater temperature is 25.0 °C and contains 4.0 mg/L of DO. The characteristics of the river upstream from the point of discharge are Q=20.0 cubic feet per second (cfs), T = 20.0°C, BODu = 3.0 mg/L. and DO = 7.0...
Please answer #5
4. What is the theoretical oxygen demand for a wastewater flow of 25 MGD (million gallons per day) containing 100 mg/L ethanol (C2H5OH)? 5. If this wastewater was discharged into a stream flowing at 10 m/s with an ultimate BOD of 5 mg/L, dissolved oxygen (DO) of 5mg/L, and deoxygenation rate coefficient ka of 0.2/day: (a) Find ultimate BOD of mixture just downstream of wastewater discharge. State all assumptions used. (b) In your opinion, is the wastewater...
The following ultimate CBOD data were measured in a stream. Find the deoxygenation 3. rate constant, Kd. 4.5 8.2 9.6 0.75 11.1 0.5 12.9 0.25 14.1 0.1 L, mg/ 15 t, days0
A stream flowing with a velocity of 2 mph contains no BOD, but has an oxygen deficit of 6 mg/1. Ten miles downstream this deficit has been reduced to 4 mg/l through adsorption from the atmosphere. The stream conditions are uniform throughout its length. Assume the rate of aeration is proportional to the deficit. (a) calculate the rate "k" (b) calculate the deficit 35 miles downstream from the original starting point **Bonus (c) plot the function using Excel to graphically...
QUESTION 1 6 point City of Hope's Wastewater has a ultimate carbonaceous BOD of 300 mg/L at 20 oC. The reaction rate k at that temperature has been determined to be 0.2/day. a) Find the BOD5. b)Find the reaction rate coefficient at 15 oC. c) Find BOD5 at 15 oC. O 132 mg/L, 0.18/day, 265 mg/L O 190 mg/L, 0.16/day, 165 mg/L O90 mg/L, 0.16/day, 245 mg/L O 232 mg/L, 0.18/day, 365 mg/L
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