Test: Methods of Disinfection - Civil Engineering (CE) MCQ

Disinfection should not render the water toxic, objectionable and unpalatable for its intended use.

Disinfection is a process which is done to kill microorganism present in the water after the filtration process.

Sunlight is a natural disinfection. Irradiation by ultraviolet rays promotes disinfection.

Boiling of water is a physical method of disinfection which is also called as disinfection by heat.

The pathogenic get killed at pH>11 which is very alkaline in nature or at pH=3 which is highly acidic.

Disinfection by heat and light are physical methods of disinfection whereas metal ions, alkalis and acids are chemical methods of disinfection.

The dose of lime used in the excess lime treatment is 10-20ppm and the excess lime can be removed by the process of re-carbonation.

Boiling method is effective in complete sterilization of water as it kills all the bacteria and microorganism present in water.

The depth of water while using ultra violet ray treatment for disinfection should not exceed 10 cm and its turbidity should be in the range of 15-20ppm.

The E-Coli bacteria will die at a pH>9. This can be done with the help of excess lime treatment.