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Waste Water Treatment


Shubham Thakkar

on 25 March 2013

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Transcript of Waste Water Treatment

Screens and grinds remove large insoluble objects
floating objects
Water passes through sedimentation tanks where it settles
Sludge is removed from the bottom
Flocculation-particles combine into large particles and are easier to remove

Obstacle 1:
Insoluble Solids Obstacle 2:
BACTERIA!!! Obstacle 3:
nitrates, phosphates, and heavy metal ions Clean Water!!! Start Unclean Water Aeration Tanks blow oxygen to allow aerobic bacteria to decompose the sludge (Activated Sludge Process).
Passed through Sedimentation tank to remove the decomposed matter.
Tertiary Treatment Most water goes through primary and secondary treatment. That's where most people say "Close Enough." Tertiary treatment is expensive. Treatment with chlorine and Ozone and Chlorine is near the distribution cycle. However, the main influence over the cleanliness of the water is Money. Ozone is better but expensive. Tertiary treatment is better. But expensive. So if you are like the canadians... Waste Water Treatment How well? Screens & Grids
Sedimentation Tanks Primary Method Secondary Method Precipitation occurs when H2S is bubbled and heavy metal ions precipitate.
Phosphate Ions are precipitated by Al or Ca
Ion Exchange uses resins to exchange OH- or H+ with the nitrate ion.
X-OH- + NO3- = X-NO3- + OH-
Biological Methods
Anaerobic bacteria turn nitrates into nitrogen
Algae ponds
Aeration Tank
Sedimentation Tank Precipitation

Ion Exchange
Biological Methods 30% EFFECTIVE!!! 90% EFFECTIVE!!! Optional and
Ion exchange is expensive because resins need to be reformed Secret!!! Ozone Chlorine Effective against bacteria but not viruses
(Residual Protection against bacteria)
Cheap to produce
Can spend a long time in water
Can be easily shipped
Can form Toxic Chloro-Organic Compounds
Leaves a "Chemical taste"
Strong oxidizing agent Effective against bacteria AND viruses (Less needed)
(No Residual Protection against bacteria)
Expensive to produce
Can spend less time in the water
Not easily shipped
Products are less toxic
No Taste
Strong oxidizing agent Protest! Or just study for the exam because that's all that IB asks for...

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