A treatment system treating 1.0 m3 /s of water includes a filter followed by a  chlorine contact chamber for removal/inactivation of pathogens. The pathogen concentration  going into the filter is 2,500 pathogens/L. The filter is known to remove 2.5 log of pathogens.  The disinfection system is being designed to reduce the pathogen concentration by 95.2%.  Pathogens are inactivated by chlorine via first order kinetics with a reaction rate constant of  4.0/hr. a. What is the concentration of pathogens in the outlet of the chlorination tank? b. What is the volume of the chlorination tank FeCl3•7H2O + 3HCO3- = Fe(OH)3(s) + 3CO2 + 3Cl- + H2O

Example 5.4. Redo the Example 5.2. once again, but consider the case that there is no recycle of the filtrate to be mixed with the fresh feed. Determine (a) the amount of K2Cro, produced per hour and (b) the rate that we need to evaporate water. Without the recycle of the filtrate, we can re-draw the flow chart as shown on the next page. We then try performing the balances around the whole process, as done previously. water vapour mz kg FIlter cake me kg K crystals (100%) makg 36.4% K 63.6% w 100% w Feed m -4.500 kg 33.3% makg 4941 50.6% w Crystalliser & Fater Evaporator Filtrate me kg 36.4%K 63.6% w

rate of 1.0 kg/ In a packed tower, a gas mixture with a 0.015 mole fraction of solute S at the inlet (the remainder being inert gases) undergoes counter- current absorption with water. The desired outlet concentration of the solute is 1% of its inlet concentration. The gas enters at a total flow /m²-s Given the dilute nature of the system, the equilibrium condition follows Henry's Law, represented by y = 1.75x, where y and x denote the mole fractions of solute S in the vapor and liquid phases, respectively. The column is packed with a material that yields an overall gas-phase mass transfer coefficient (Kya) of 0.06 kg-mole m³ smole fraction The tasks are to calculate: kg m2.s (molecular weight = 29), and pure water is introduced at a rate of 1.6 (a) the required height of the packing for the separation, and (b) the minimum rate of liquid needed for the separation. Additionally, it is asked how the required packing height would change if a different packing type with a Kya of kg-mole…

Please help class is mass transfer, will rate question. Show all steps and equations used, thank you.

The Site Ion Exchange Plant (SIXEP) at Sellafield Ltd.'s nuclear facility in the UK is often described as the 'kidneys' of the plant. What TWO STATEMENTS below are a true description of the function of the ion exchange material? A It is designed to remove radioactive Cs*, Sr²+ and Mg²+ions. B Sodium (Na+) ions can enhance the exchange efficiency. C It is designed to remove radioactive Cstions only. (D) It is designed to remove radioactive Cs and Sr²tions. E Sodium (Na+) ions can reduce the exchange efficiency. (F) Sodium (Na+) ions are used to regenerate the columns.

20.12 According to Chick's law, the rate of kill of bacteria by chlorination follows first-order reaction kinetics. Assuming this to be true, how much contact time is required to kill 99 percent of the bacteria with a chlorine residual of 0.1 mg/L, if 80 percent are killed in 2 min with this residual? (See Sec. 3.10.)

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