0 CENG471-Mid-Term 1-Spnng 2011.pdt-Adobe Reader File Edit View Winduw Help Tool

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0 CENG471-Mid-Term 1-Spnng 2011.pdt-Adobe Reader File Edit View Winduw Help Tools Fill&Sign; Comment Temperature-15 ? uestion # 3: (20 pts.) Join each attribute in Column "A" to the one in Column "B" that matches it the most Column"A" [1] Coagulation [2] Flocculation 31 Sedimentation [4] Filtration Column "B" (a) Settling velocit (b) Secondary treatment c) Sea water (d) Removal of sediment, bacteria, rotozoa, and viruses 51 Activated sludgc e) Microorganisms inactivation Jar test 71 Ozone (g) Docsn't form disinfection byproducts like THMs and HAAs 81 Chlorination [9] Reverse osmosis h) Destabilization of colloids (i) can be problematic if source water is high in organics 101 Ultrafiltration ) Backwash uestion # 4: (20 pts.) O Type here to search 9:15 26-Mar-18

Explanation / Answer

Coagulation --jar test (to determine dosage of coagulant, alum dosage)

Flocculation-- de stabilzation of colloids( it happens when coagulant added with water ,it destabilize the colloids)

Sedimentation--settling velocity

Filtration-- back washing(it is done in rapid sand filter to remove clogged material)

Activated sludge-- secondary treatment.

UV-- doesn't form disinfection byproduct(THM- trihalomethane)

Ozone-- microorganisms inactivation(disinfection ,after secondary treatment)

Chlorination-- can be problematic if source water is high organic content( chlorination is not effective if water is alkaline)

Reverse osmosis-- sea water( by reverse osmosis salt water is treated)

Ultra filtration-- removal of sediments,bacteria,protozoa and virus(it is very effective to remove very fine particles)

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