If the 3-day BOD (BOD3) of a waste is 75 mg/L & the BOD decay constant, k is 0.345 per day, its ultimate BOD is ____ mg/L.
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If the 3-day BOD (BOD3) of a waste is 75 mg/L & the BOD decay constant, k is 0.345 per day, its ultimate BOD is ____ mg/L.
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- A river has ultimate BOD of 60 mg/L, a width of 20 m, a depth of 5 m and a flow rate of 9 m3/s. A waste at 20°C having ultimate BOD of 250 mg/L, a decay rate constant of 0.1/day, and flow rate of 1 m% is discharged into the river. The river and the waste are at the same temperature of 20°C and contain the same pollutant (same decay rate constant). If there is instantaneous mixing of the waste in the river, determine:a. Ultimate BOD in the river immediately after mixing of the waste mixed with the river. b. The value of BOD in the river five days after mixing of the waste with the river. c. BOD concentration in the river at 50 km downstream from the point of discharge.d. BOD removed at 95 km downstream from the point of dischargeYou are the lead engineer on a wastewater treatment plant with a biological reactor. You are required todetermine how much biomass will be produced in kg per day in your plant. A junior engineer determines theultimate BOD of the incoming waste as 600 mg/l, with a decay constant of 0.1/d. The incoming substrateconcentration used should be the five-day BOD. The incoming flow is 75 m3/d however there are lossesupstream of the plant accounting for 15 m3/d of the flow. The target BOD discharged from the plant is 25mg/l. the kinetic constants for the system are Ks = 90 mg/L BOD5, kd = 0.2 d-1, μm = 1.5 d-1, and Y = 0.6 mg VSS/mgBOD5. Include a sketch to illustrate the biological reactor and its incoming flows.Some waste has a five-day BOD at 20 ̊C equal to 210 mg/L and an ultimate BOD of 350 mg/L. Find the five-day BOD at 25 ̊C. Note, reaction rate coefficients can be adjusted for temperature using the Arrhenius equation, which is kT2 = kT1h^(T2-T1), where h is 1.047 typically.
- A waste of 600 m³/hr flow rate with an ultimate BOD20 = 140 mg/l is to be treated in an activated sludge process to yield an effluent of 20mg/1 BOD5 and 25mg/1 suspended solids. For the reactor the detention time = 6 hrs, sludge age = 10days, under flow SS concentration = 15000mg/l, decay rate = 0.055 day, yield coefficient = 0.65, BOD of the effluent SS =60% of the suspended solid concentration and the solids are 80% volatile. ( k₁, 20 = 0.24 /day) Find: -1- MLSS (mg/l) 2- Recirculation ratioA lake has 5×10^9 m³ of water with a DO concentration of 7.5 mg/l. 12000 m³ of an effluent with 120 mg/l BOD is discharged into this lake and 70% of the organic matter is decomposed in 7 days. Find out the DO concentration in the lake after 7 days.A stream containing no biochemical O2 demand (obviously a hypothetical situation) has a DO of 5.00 mg/L and a flow rate of 8.70 m3/s. The temperature of the stream is 15 degrees Celsius. The average velocity in the stream is 0.174 m/s. The average depth is 5 m. Determine the reaeration coefficient and the rate of reaeration.
- A sample of water at pH 10.5 has 36 mg/L of CO3-2 and 26 mg/L of HCO3-Including the contribution of [H+] and [OH-], find the alkalinity as CaCO3.Some waste has a five-day BOD (biochemical oxygen demand) at 20 oC , equal to 210 mg/L and an ultimate BOD of 350 mg/L. Find the five-day BOD at 25 oC.Advection, diffusion, and reaction in a channel Approximately 50 m3 of an agricultural pesticide with an initial concentration of 1.6 × 105 mol/m3 have been spilled into a stream following a train derailment. You have been called in to predict the aqueous concentrations of this pesticide at various points along the stream, and the mass that will be delivered to a lake with critical habitat 70 km downstream. You look up the main component of the pesticide and see that it degrades in water (due to hydrolysis reaction) with a half-life of 1.9 h. The discharge rate of the stream is 75,000 L/min. It has an average depth of 0.3 m and an average width of 1.2 m. a. Calculate the maximum concentration (in mol/L) of the pesticide that will be observed at a town 10 km downstream and at the point where the stream reaches the lake, 70 km downstream. Assume a sheer velocity of 0.40 m/s. b. Plot the concentration of this pesticide entering the town and the lake with time. Care should be taken when…
- Aluminum pieces inadvertently collect on the filter. a. If left on the filter, will the percent yield of the alum be reported as too high or as too low? Explain. b. If the aluminum pieces are detected on the filter, what steps would be used to remedy the observation? Explain.Can you please help me in answering this question. thank you A river, flowing at 1.5 m3/s, is polluted with the pesticide permethrin and flows into a lake (100 m x 100 m 2.5 m). The steady state concentration of permethrin leaving the lake is 1.4 ppm and the average cross-sectional area of the river is 2.7 m2. The half-life of permethrin in this environment is 19 hrs. What is the concentration of permethrin entering the lake and what distance downstream of the outlet would the concentration be less than 1 ppm?Q2) A waste of 600 m¥hr flow rate with an ultimate BOD2° = 140 mg/l is to be treated in an activated sludge process to yield an effluent of 20mg/l BOD5 and 25mg/l suspended solids. For the reactor the detention time = 6 hrs , sludge age = 10days , under flow SS concentration = 15000mg/1 , decay rate = 0.055 day , yield coefficient = 0.65 , BOD of the effluent SS =60% of the suspended solid concentration and the solids are 80% volatile.( k1,20 = 0.24 /day) Find: - 1- MLSS (mg/l) 2- Recirculation ratio _Y0.(5, -9 T 1+K,.6, V=006