ENVENG3200 - Spring XXXXXXXXXXHW 10 - Dr. Hull1. Compare and contrast slow sand filtration and rapid...

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ENVENG3200 - Spring XXXXXXXXXXHW 10 - Dr. Hull
1. Compare and contrast slow sand filtration and rapid media filtration
2. Compare and contrast PAC and GAC
3. Compare and contrast disinfectants
4. Determine the inactivation rate constant for a bacterium treated with UV light, resulting in the following bacterial concentrations (CFU/mL) before treatment (at t=0) and at each UV i
adiation time after treatment.
    Time (sec)
    0
    2
    4
    6
    8
    10
    Concentration (CFU/mL)
    154
    62
    19
    6
    3
    1
5. A wastewater treatment plant receives a flow of 35,000 m3/day. Calculate the required volume (m3) for a 3 m deep horizontal flow grit chamber that will completely remove particles with a specific gravity of 1.9 or greater and a size greater than 0.1 mm diameter. Check Reynold’s number to make sure Stokes’ law applies. Assume the temperature of the water is 15 °C.

2020hw10-dgxvifqi.docx

Akriti · Accepted Answer

Question 1
Rapid Media Filtrations: This is done over pre-treated water. The rate of water flow is in between 4 to 21 m/h. Rapid sand filter is been used in the filtration process. Pre-treatment is very compulsory in this process. 
Slow sand Filtrations: This is done over the water that is raw in nature. The rate of water flow is in between 0.1 m/h. Slow sand filters are been used in the filtration process. Pre-treatment is not necessary. 
Question 2. 
· PAC stands for Powered Activated Carbon and GAC stands for Granular Activated Carbon.

ENVENG3200 - Spring XXXXXXXXXXHW 10 - Dr. Hull 1. Compare and contrast slow sand filtration and rapid media filtration 2. Compare and contrast PAC and GAC 3. Compare and contrast disinfectants 4....

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