A wastewater that has TOC concentration of 200 mg/L is to be treated by a fixed–bed granular carbon adsorption column for a wastewater flow of 227 m3/d, and the allowable effluent concentration, Ceff, is 20 mg TOC/L. A breakthrough curve (see below) has been obtained from an experimental pilot column operated at 2.36 BV/h.

SEPERATIONS Absorption: Contaminant in a Gas Effluent We are going to absorb 90% of a contaminant in a gas stream containing 15.0 mole of the contaminant by absorntion into a water phase. The total inlet gas flow to the absorption column is 100.0 kgmole/hr and the total water flow is 200 kgmole/hr. Inlet water is NOT pure but contains 0.5% of the contaminant. I he process operates isothermally at 300k and a pressure of 1 atm. The equilibrium for this system is effectively characterized by either a Henry's Law relationship or Raoult's Law (using partial pressure), a general equilibrium relationship that can be used is ya=1.60*xa. plot the operating line and determine the minimum number of stages (graphically) for the equilibrium relationship provided. Confirm the results of part (a) using the analytical Kremser equation.

1) An evaporator is concentrating solutions coming from three different sources.The first source contains 20% NaCl by weight, the rest is water. The secondsource contains 10% by weight NaCl, 30% NaOH by weight, the rest water. Thethird source contains 25% NaCl by mole, 25 % NaOH by mole, the rest water.The feed streams are fed directly to the evaporator at the following flow rates;100 kg/min for the first source, 7800 kg/min for the second source and 120kg/min for the third source. If 70% of the original water is evaporated, calculate(a) composition in % by weight of the product (b) the flow rate in kg/min of theproduct.2) Two process streams are mixed to form a single stream. Only the flow in themixed stream is known. A soluble salt is added to one of the original streams ata steady rate. Samples taken of this stream show it to be 4.76 % w salt. Samplesfrom the combined stream show 0.62% w salt. What is the ratio of the flows inthe two original streams?3) A chemist attempts to prepare…

A cooling tower works with the amount of cooling water 1 ton/hour. Conditions of cooling water in the cooling tower has a solid content of 1350 ppm. The cooling water entering the cooling tower is processed in such a way that the solids content is a maximum of 225 ppm. If the cooling water evaporated rate is assumed to be 2.5% the cooling water inlet rate, calculate the concentration cycle, the added water rate, and the blowdown water rate!

A// Fick's first diffusion law states that: Mass flux = -D Where mass flux = the quantity of mass (g/cm²/s), D a diffusion coefficient (1.6×10-6 cm²/s), c concentration, and x = distance (cm). An environmental engineer measures the following concentration of a pollutant in the sediments underlying a lake as the following: 0 2 6 0.12×10-6 0.64x10-6 1.20×10-6 Use a suitable Newton's interpolation formula available to estimate the derivative at x = 0 and then calculate the mass flux of pollutant. X, cm C, g/cm³ de dx =

a) An ultrafiltration plant is required to treat 50 m/day of a protein-containing waste stream. The waste contains 0.5 kg/m3 of protein which has to be concentrated to 20 kg/m3 so as to allow recycling to the main process stream. The tubular membranes to be used are available as 30 m? modules. Pilot plant studies show that the flux (J) through these membranes is given by: J (in m/h) = 0.02 In (30/C) where C; is the concentration of protein in kg/m³. Due to fouling, the flux never exceeds 0.04 m/h. Operation for 20 h/day may be assumed. i. Calculate the minimum number of membrane modules required for the operation of a single feed and bleed stage. ii. Determine the flux, if the membrane modules used are double from the calculated in Question 2a(i).

Actinomycin D present at 260 mg/L in fermentation broth is to be extracted into butyl acetate. At pH 3.5, the distribution constant is 57. How many stages are required to recover 99% of the antibiotic from a broth flow rate of 450 L/hr using a solvent flow rate of 37 L/hr?

a double effect evaporator is fed by 31896 lbm/hr of 9% potassium chloride solution. At the end of evaporation a 41% KCl solution is obtained. The water evaporated in the second effect is 1.5 times the water evaporated in the first effect. Determine:a) The amount of 41% concentrated solutionb) The amount of water evaporated in the first and second effectsc) The amount of solution fed into the second effect, as well as its composition

If the slurry is filtered using a larger filter press with an area of 15 m2 at a constant rate of 450 L/h, calculate the volume of filtrate that will be recovered and the time it will take to reach a pressure of 1000 kPa.

Dissolved oxygen is being gassed off water using pure nitrogen gas as the sparger in a wetted wall column. At one point in the column, the oxygen content of the water is 6.3 mg/L. The liquid and gas side local mass transfer coefficients were determined as 0.0638 m/s and 0.0998 mol/m² -s-atm, respectively. If the Henry's Law constant for the system is 770 atm/M at 27.5°C and 1 atm, what percent of the resistance is offered by the gas phase? 45.4% O 71.0% O 56.5% O 54.6 % 34.9 %