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Purification of water in large scale - Coggle Diagram
Purification of water in large scale
storage
Physical action
90% of imprity suspend by gravity
Chemical action
Aerobic bacteria oxidise the organic matter present in the water with the help of dissolved oxygen, reducing the content of free ammonia and increasing concentration of nitrates
Biological action
on storage the pathogenic organism will die, on long term veg growth like algae seen, impart bad smell and color
bacterial count drop by 90% in 5-7days
Filtration
Biological / Slow sand filter
consist of layer of sand and gravel in the concrete or plastic container. the water level is maintained above tthe sand layerr. this water latyer allow the bioactive layer to grow on the top of the sand, which help in reduction of the disease causing organism
Elements - 1. SUpernantant (raw) water, 2. a bed of graded sand, 3. under drainage system, 4. system of filter control values
Rapid sand or mechanical filtration
steps - coagulation, rapid mixing, flocculation, sedimentation, filtration
Chlorination
Chlorine gas
Perchlorin
Chloramine
Purification of water in small scale
Chemical disinfection
Filtration
Boiling