You have decided to design a CSTR with recycle to degrade TCE (trichloroethylene) cometabolically by aerobic phenol-utilizing bacteria. To do this, you will feed phenol (C6H5OH; as a C source) and oxygen, along with required nutrients, to the reactor in order to grow a population of bacteria that can fortuitously degrade TCE. The problem is to first determine what mass of bacteria is required in the reactor to effect the TCE destruction desired, and then to determine how much phenol and oxygen must be fed to the reactor to maintain that population. The waste characteristics are as follows: Q0 = 5 m3/d, C0 = 100 μg/L TCE (influent concentration), X0 = 0 mg/L. The Xa selected for design is 1500 mg VSSa/L, and θx is 8 d. Kinetic coefficients for TCE decomposition are as follows: qTCE = 0.015 mg TCE/mg VSSa, KTCE = 0.5 mg/L. Kinetic coefficients for phenol degraders are Y = 0.8 g VSSa/g phenol, b = 0.1/d, q = 1 g phenol/g VSSa•d, and K(phenol) = 1 mg/L. 2.1. Determine the reactor size required to effect 95% TCE removal. 2.2. Determine the mass in kg/d of phenol that should be supplied to the reactor to maintain the desired bacterial population. 2.3. Determine the masses (kg/d) of oxygen, ammonia-nitrogen, and phosphorus required.
You have decided to design a CSTR with recycle to degrade TCE (trichloroethylene) cometabolically by aerobic phenol-utilizing bacteria. To do this, you will feed phenol (C6H5OH; as a C source) and oxygen, along with required nutrients, to the reactor in order to grow a population of bacteria that can fortuitously degrade TCE. The problem is to first determine what mass of bacteria is required in the reactor to effect the TCE destruction desired, and then to determine how much phenol and oxygen must be fed to the reactor to maintain that population.
The waste characteristics are as follows: Q0 = 5 m3/d, C0 = 100 μg/L TCE (influent concentration), X0 = 0 mg/L. The Xa selected for design is 1500 mg VSSa/L, and θx is 8 d. Kinetic coefficients for TCE decomposition are as follows: qTCE = 0.015 mg TCE/mg VSSa, KTCE = 0.5 mg/L. Kinetic coefficients for phenol degraders are Y = 0.8 g VSSa/g phenol, b = 0.1/d, q = 1 g phenol/g VSSa•d, and K(phenol) = 1 mg/L.
2.1. Determine the reactor size required to effect 95% TCE removal.
2.2. Determine the mass in kg/d of phenol that should be supplied to the reactor to maintain the desired bacterial population.
2.3. Determine the masses (kg/d) of oxygen, ammonia-nitrogen, and phosphorus required.
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