Particles of silt and clay
I)Carbonates and bicarbonates of calcium and mg.
ii)Sulphates and chortles of ca and mg.
iii)carbonates and bicarbonates of sodium
v)chlorides of Na
vi)Fluorides of Na
Hardness & alkalinity
Hardness and corrosion
Excess over 50mg/lit
Methenoglubanemiao r blue babies. Brackish taste
Excess over 1.5mg/L causes Fluor sis.
Taste colour and hardness
Taste and odour
Dead animals, hairs, insects, etc..
Large Quantities of albuminoidal nitrogen with little quantities of ammonia and chlorides.
Large quantities of Albuminoidal nitrogen
Acidity, taste and colour Contamination
Pathogens, contamination due to sewage. Etc…
Colloids are particles in a finely divided state. They are neither in suspension nor insolvable but in condition midway between the two. These particles are so small that their removal in a sedimentation tank is impossible at reasonable overflow rates and detention time. They are not visible to the naked eye and are electrically charged and repel cash other. The size of these particles is between 1 minor to 1 mille micron. They impart colour to the water.
Their numbers may be very large because water is a very good solvent and can dissolve all the salts to which it comes in contact. Salts of calcium, magnesium when dissolved in water cause taste, hardness, alkalinity, etc….