Topic 4 WTP&WWTP

Select one correct statement

• Disinfectant agent: polyaluminium chloride, ferric chloride

• Electrochlorination involves safer process than liquid chlorination

• Monovalent ion acts better than divalent ion EDL compression

• Acidity plays major role in common coagulation process

Which is the right/best sequence of process

• Water intake, coagulation, aeration, filtration

• Aeration, rapid mixing, coagulation, filtration

• Water intake, aeration, coagulation, rapid mixing, filtration

• Rapid mixing, coagulation, settling, aeration

Jar test is a method to?

• Reduce turbidity in filtered water

• Identify pH of sludge

• Dose coagulating agent

• Float floc in water

Post treatment for water includes the following, EXCEPT:

• Add calcium hydroxide

• Add sodium hypochloride

• Add sodium fluoride

• Add ferric chloride

Water filtration process can be as follows, EXCEPT:

• Macro strain

• Rapid filtration

• Diatomaceous earth

• Pressure sand filtration

Dissolve air floatation involves

• precipitation of big bubbles

• saturation vessel and air compression unit

• float contains high solid percentage

• air saturation in water at low pressure

Pretreatment, aeration, coagulation, rapid mixing, filtration

• True

• False

Residual treatment is necessary for dewatering and eliminating odour

• True

• False

Preliminary treatment can be of the following, EXCEPT:

• Grit chamber

• Bar screen

• Pulsator

• Band screen

Primary treatment purposely to separate oil, grit and solid waste.

• True

• False