Q4) A town of discharges 15,000 m'd of treated wastewater into a Creck. The treated wastewater ha...
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 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.
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...
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.
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.
7. A BOD test is run using 100 mL of treated wastewater effluent mixed with 200 mL of dilution water (containing no BOD). The initial DO of the mix is 9.0 mg/L After 5 days, the DO is 4.0 mg/L. After a long period of time, the DO is 2.0 mg/L, and it no longer seems to be dropping. Assume nitrification has been inhibited so that only carbonaceous BOD is measured (a) What is the 5-day BOD of the wastewater?...
2. A tannery wastewater treatment plant has 2250m/d of effluent having de-oxygenation rate of 0.23/d at 20°C. Determine the ultimate Biochemical Oxygen Demand (BOD) (L.) and the remaining O, after 5 days (L.). Then, compute de-oxygenation rate constant (kd) and determine the rate of de-oxygenation in mg/L/d at 25°C. Note that the stream has 5 days BOD of the waste (BOD) OF 450 mg/L. The avg speed, u, of the stream flow is 0.03 m/d. The depth.h, is 1.2m and...
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...
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....