A batch reactor is to be used to treat raw water to achieve 95% pollutant removal. The pollutant has a second-order reaction rate constant of 0.35 L/(mg.day), what is the required residence time of water in the batch reactor, in days?
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A batch reactor is to be used to treat raw water to achieve 95% pollutant removal. The pollutant has a second-order reaction rate constant of 0.35 L/(mg.day), what is the required residence time of water in the batch reactor, in days?
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- A continous flow, completely mixed reactor is to be used to treat raw water to achieve 95% pollutant removal. The pollutant has a second-order reaction rate constant of 0.35 L/(mg.day), what is the required residence time of water in the batch reactor, in days?A continous flow, completely mixed reactor is to be used to treat raw water to achieve 95% pollutant removal. The pollutant has a second-order reaction rate constant of 0.35 L/(mg.day), what is the required residence time of water in the continous flow reactor, in days?A batch reactor is to be used to treat raw water to achieve 95% pollutant removal. The pollutant has a second-order reaction rate constant of 0.35 L/(mg.day), what is the required residence time of water in the batch reactor, in days? For the same water in above problem , assume we are planning to use a continuous flow, completely mixed reactor, what would be the required residence time? How does this compare to the time for the batch reactor in problem two?
- A thermal oxidizer incinerator operates as a plug flow reactor at a temperature of 250 deg C. The first order rate constant for vinyl chloride removal is 45/sec at 250 degrees C and the inside diameter of the incinerator (which is shaped like a cylinder) is 1 m. (a) If the pollutant (Vinyl chloride) enters the incinerator at a flow rate of 3,000 m3/min and it is desired to remove 99.99% of the pollutant, what should the length of the incinerator be? (b) What is the length of the incinerator if the desired removal is increased to 99.99995%?For a completely mixed activated sludge reactor treating municipal wastewater, we can assume the following kinetic and operating parameters: Maximum specific growth rate (μmax) = 3 day-1 Yield = 0.6 mass cells/mass BOD5 utilized Half-velocity coefficient (KS) = 200 mg/L Decay coefficient (KD) = 0.06 day-1 Influent substrate concentration (S0) = 400 mg/L MCRT = 5 days Reactor volume = 3 ML (million liters) Wastewater flow rate (Q) = 10 MLD (million liters per day) Returned activated sludge flow rate (QR) = 5 MLD Calculate the substrate concentration in the effluent (S), cell concentration in the reactor (X), sludge production rate (QWXW), hydraulic retention time (θH), waste sludge flow rate (QW), F/M ratio, and clarifier size.Environmental Engineering: Water Treatment Please consider each of the following points: a. Determine the required residence time for each reactor of 3 equal volume CSTRs in series given a zero-order reaction with a reaction rate constant, k = -5 mg/L hr. The influent concentration is 125 mg/L and 95% conversion is required across the three-reactor system. What is the total reactor system residence time? b. Determine the required residence time for a single CSTR given the same conditions. c. Determine the required residence time for a PFR given the same conditions. d. Why are all three residence time the same?
- Disinfection of 20 MLD water is done with 30 kg chlorine to achieve 99% efficiency in a contact time of 10 minutes. If the same efficiency is desired in 30 MLD discharge in 12 minutes, then the amount of chlorine required is kg/d. Take dilution coefficient as 1.1. A CM reactor receives influent containing 10 mg/L of tracer dye for 2 hours. The tracer addition is terminated but the flowrate of water is maintained. The volume of the reactor is 10 L and the flowrate is 2 L/hr. What is the concentration of tracer in the reactor 1 hr after the dye addition is terminated? The reactor had an initial concentration of tracer of 1 mg/L when the tracer addition commenced.Problem 2 At a Cleanup site, a contaminated ground was dug out and treated in a completely mixed aerated lagoon. The following information is collected using a completely mixed batch reactor in a laboratory. Assuming a first-order reaction. a) Estimate the rate constant, k. b) The time required to achieve 95% reduction in the original concentration. c) Estimate the initial concentration at t=0. Time(days) 5 30 Waste Concentration (mg/L) 500 100
- In a biological wastewater treatment system, which of the following conditions could beconsidered as an anoxic condition: ( )(A) [Dissolved Oxygen] = 3.5 mg/L and [Ammonia-N] = 10 mg/L;(B) [Dissolved Oxygen] = 0.3 mg/L and [Nitrate-N] = 15 mg/L;(C) [Dissolved Oxygen] = 0.05 mg/L and [Nitrate-N] = 0.1 mg/L;(D) [Dissolved Oxygen] < 0.05 mg/L and [Ammonia-N] = 10 mg/LA waste stream flows at 2,000 liters/day with a concentration of 60 mg/l of hazardous chemicalA. The chemical undergoes a first-order decay reaction with k = 0.01/sec. Complete performanceanalyses of the three common ideal chemical reactors to determine the effluent concentration ofchemical A for the following conditions:1. CSTR, V = 500 liters2. PFR, V = 14 liters3. Batch Reactor, V = 500 liters (i.e., 4 batches of waste processed per day to handle thetotal daily volume of 2,000 liters) with a reaction time τ = 10 min.Compare and contrast the performance of each reactor type.A CMFR is working at a steady state. The volume of the reactor and flow rate are 10m3 and 2.5m3/h respectively. The influent pollutant concentration is 10mg/L. Calculate the pollutant concentration in the reactor when the pollutant is going first order decay with reaction rate constant k=0.3/h