A wastewater treatment plant discharges hot water (310K) to a river. The flow rate of the river is 4×1010 L/day. Upon mixing, the hot water is cooled to 290K and the river water is heated from 288K to 290K. If 20% of the heat from the wastewater treatment plant effluent is radiated to the atmosphere, what is the wastewater treatment plant discharge rate (L/day)?
A wastewater treatment plant discharges hot water (310K) to a river. The flow rate of the...
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...
A tannery discharges wastewater into a river under the following conditions: Parameter Wastewater River 1.148 Flow (m/s) BOD, at 15°C (mg/L) DO (mg/L) Temperature, Speed (m/s) Depth (m) 1.00 15.0 7.222 7.66 6.00 15.0 0.300 2.92 The BOD rate constant, k, in the river/wastewater mixture is measured as 0.379 d at 20°C. Deter- mine the ultimate BOD (in kg/d) that the tannery may discharge and still keep the DO in the minimum DO in the river above 5 mg/L.
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...
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.
O The town of Gangnam in Seoul, Korea discharges 17360 m3/day of treated wastewater in the Han River. The treated wastewater has a BOD5 of 12 mg/L and a BOD decay constant, k, of 0.12 day at 20 °C. The river has a flow rate of 0.43 m/s and an ultimate BOD, Lo, of 5 mg/L. The DO of the river is 6.5 mg/L and the D0 of the wastewater is 1.0 mg/L (a) Calculate the ultimate BOD of the...
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...
A community wastewater treatment plant has an average discharge flow rate of 3.5 MGD (million gal per day) with a BOD5 concentration of 28 mg/L. The stream receiving the discharge has a flow rate of 12 ft3 /s and a BOD5 of 11 mg/L. You may assume k = 0.18 d -1 . a. Determine the BOD5 immediately after the streams have mixed. b. Determine the BODu for the stream after the streams have mixed. c. Downstream of the discharge...
DO Sag Curve: A wWTP discharges wastewater to a nearby river and a city 2.88 km downstream uses the river for water supply. Data is given below. Determine the DO at the intake of the city. Paraneter Flow (m3/s) BODL (mg/L) Da (mg/L) River (after mixing) 0.3 43-4 Speed (m/s) Ka at 18°C(d-) Kr at 18° C (d-) Answer: t- 0.333 d, D0-o mg/L (cannot be a negative number) 18 0.1 1.83 2.03
A tannery with a wastewater flow of 0.011 m^3/s and a BOD_s of 590 mg/L discharges into a creek. The creek has a flow of 1.7 m^3/s. Upstream of the tannery, the BOD_s of the creek water is 0.6 mg/L. The BOD rate constants (k) are 0.115 day^-1 for the tannery and 3.7 day^-1 for the creek. Calculate the initial ultimate BOD alter mixing.
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...