Civil Bhai

v) Ultra violet rays :

• Very costly technique and is an effective method for the disinfection of water.

• No residual effect is available for protection against recontamination.

• Adopted for water supply installations of private Buildings. Institutions, Treating small quantities of water in hospitals. dispensarics for surgical use. Swimming pools

vi) Potassium Permanganatc :

• For disinfecting well water supplies which are generally contaminated with lesser amounts of bacteria.

• Can remove 100 % organisms causing cholera.

• it also oxidizes organic matter.

vii) Silver or Electro-Katadyn Process:

• Removes algae also and takes care of future  pollution. it is costly.

viii) Chlorination :

•Universally adopted for public water supplies because it is capable of providing residual disinfecting effects for long periods. It satistics all the requirements of an ideal disinfectant.

• It takes carc‘ of any possible future contamination. ( i.c it prevents rccontamination)

• only disadvantage is it impact bad taste.

•The addition of chlorine does not produce any significant change In the pH.

• value of the natural waters.

•Chlorination is not effective if the water is alkaline.