The Wastewater contains 50000000 particles of a contaminant per L. The maximum discharge 1000 particle /L....
The Wastewater contains 50000000 particles of a contaminant per L. The maximum discharge 1000 particle /L. What will length of a PF reactor if water flowing with a velocity of 1 m/s. (Given reaction rate constant = 0.5 min-1).
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The Wastewater contains 50000000 particles of a contaminant per
L. The maximum discharge 1000 particle /L....
A wastewater treatment plant must disinfect its effluent before discharging the wastewater to a near-by stream....
A wastewater treatment plant must disinfect its effluent before discharging the wastewater to a near-by stream. The wastewater contains 4x107 fecal coliform colony-forming units (CFU) per 100 mL. The maximum permissible fecal coliform concentration that may be discharged is 2,000 fecal coliform CFU/100mL. It is proposed that a pipe carrying the wastewater be used for disinfection process. Determine the length of pipe required if the linear velocity of the wastewater in the pipe is 0.6 m/sec. Assume that the pipe...
1. In 1970, the total phosphorus (TP) load to Lake Erie was 18.150 tonnes/year (where tonnes...
1. In 1970, the total phosphorus (TP) load to Lake Erie was 18.150 tonnes/year (where tonnes or metric ton = 1,000 kg). The surface area, volume, and outflow from Lake Erie are given as 25.2 x 10 m² 468 x 10 m, and 182 x 10 m yr, respectively. Based on previous evaluations, the total phosphorus is removed from the lake with an apparent settling rate of 16 m/yr. a. Draw a diagram and write the mass balance equation for...
A sedimentation tank is used for the settling of a suspension of uniform particles of glass...
A sedimentation tank is used for the settling of a suspension of uniform particles of glass in liquid water. It was found that the relation between the observed sedimentation velocity of particles Uc and the fractional volumetric concertation of particles C is given by the following equation: uc u -=(1-C) 4.8 where U, is the free settling velocity of an individual solid particle. Note that the volumetric rate of sedimentation (settling) per unit area or flux is equal to the...
5. A groundwater containing 50 mg/L of Trichloroethane (TCA) will be treated in a rectangular PFTR...
5. A groundwater containing 50 mg/L of Trichloroethane (TCA) will be treated in a rectangular PFTR reactor as shown below. The reactor is open to atmosphere. The water flows through the reactor with a constant velocity of (V) of 1 m/min. TCA can be removed in PFTR by evaporation and biochemical degradation. For evaporation of TCA, the two-film mass transfer coefficient (KA2) is given as 20 cm/h, while for the biodegradation of TCA, the first-order reaction rate constant (ki) is...
An industrial plant claims to discharge no more than 1000 gallons of wastewater per hour, on...
An industrial plant claims to discharge no more than 1000 gallons of wastewater per hour, on the average, into a neighboring lake. An environmental action group decides to monitor the plant, in case this limit is being exceeded. A random sample of 42 hours is selected over a period of a month. The data are unimodal and roughly symmetric. R 1123, s- 688, and Standard Error 106.161 (a) Using StatCrunch, the p-value (3 decimal places) (b) Are the conditions met...
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...
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...
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 number of coliform bacteria is reduced from an initial concentration of 2 million per 100 mL to 400 per 100 mL in a...
The number of coliform bacteria is reduced from an initial concentration of 2 million per 100 mL to 400 per 100 mL in a long narrow chlorination tank under steady wastewater flow with a hydraulic detention time of 30 min and a chlorine concentration of 5.2 mg/L. Assuming, n = 1.3, first-order kinetics and ideal plug flow, calculate the reaction-rate constant. Using this rate constant, find the effluent concentration if the reactor is operated as a completely-mixed reactor. Hint: θ...
NT4-1. 3 pts. A beef stick manufacturing plant proposed to discharge saline (salty) wastewater to a...
NT4-1. 3 pts. A beef stick manufacturing plant proposed to discharge saline (salty) wastewater to a river. Upon reviewing the proposal, the governing regulatory agency set a 200 mg/L salt maximum level in the river downstream of the discharge point. In response the manufacturing plant proposed adding desalination equipment between the manufacturing plant and the river to remove enough salt from the wastewater to meet the regulatory requirement, 15% of the wastewater flow becomes brine (concentrated salt), a byproduct from...
1. In 1970, the total phosphorus (TP) load to Lake Erie was 18.150 tonnes/year (where tonnes or metric ton = 1,000 kg). The surface area, volume, and outflow from Lake Erie are given as 25.2 x 10 m² 468 x 10 m, and 182 x 10 m yr, respectively. Based on previous evaluations, the total phosphorus is removed from the lake with an apparent settling rate of 16 m/yr. a. Draw a diagram and write the mass balance equation for...
A sedimentation tank is used for the settling of a suspension of uniform particles of glass in liquid water. It was found that the relation between the observed sedimentation velocity of particles Uc and the fractional volumetric concertation of particles C is given by the following equation: uc u -=(1-C) 4.8 where U, is the free settling velocity of an individual solid particle. Note that the volumetric rate of sedimentation (settling) per unit area or flux is equal to the...
5. A groundwater containing 50 mg/L of Trichloroethane (TCA) will be treated in a rectangular PFTR reactor as shown below. The reactor is open to atmosphere. The water flows through the reactor with a constant velocity of (V) of 1 m/min. TCA can be removed in PFTR by evaporation and biochemical degradation. For evaporation of TCA, the two-film mass transfer coefficient (KA2) is given as 20 cm/h, while for the biodegradation of TCA, the first-order reaction rate constant (ki) is...
An industrial plant claims to discharge no more than 1000 gallons of wastewater per hour, on the average, into a neighboring lake. An environmental action group decides to monitor the plant, in case this limit is being exceeded. A random sample of 42 hours is selected over a period of a month. The data are unimodal and roughly symmetric. R 1123, s- 688, and Standard Error 106.161 (a) Using StatCrunch, the p-value (3 decimal places) (b) Are the conditions met...
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...
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...
NT4-1. 3 pts. A beef stick manufacturing plant proposed to discharge saline (salty) wastewater to a river. Upon reviewing the proposal, the governing regulatory agency set a 200 mg/L salt maximum level in the river downstream of the discharge point. In response the manufacturing plant proposed adding desalination equipment between the manufacturing plant and the river to remove enough salt from the wastewater to meet the regulatory requirement, 15% of the wastewater flow becomes brine (concentrated salt), a byproduct from...
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