Waste Water Case Study

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ENVIRONMENTAL ENGINEERING (CLE 1006)

DIGITAL ASSIGNMENT 2

Identification of suitability of water for drinking purpose and suggesting suitable methods of treatment

AMAN KUMAR
16BCL0373
B.TECH. (CIVIL ENGINEERING)
SCALE

Question:
Wastewater is having following impurities that are needed to treat in order to reuse the treated waste water for food crop production.
Impurities: Debris, wood, oil, grease, sand, microbes, silt, organic matter, inorganic matters, Nitrate, Potassium.
• In such a case what would be the various treatment unit would you suggest for wastewater treatment (show as a flow chart).
• Discuss in detail about the mechanism of each treatment unit in treating the waste water. (Note: which impurities are treated and how they are treated)
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Debris, Wood Removal-
Most solids can be removed using simple sedimentation techniques with the solids recovered as slurry or sludge or screening primary technique. So ultimately Sedimentation technique can be used to separate these two impurities.
Sand Removal-
Very fine solids and solids with densities close to the density of water pose special problems. In such case filtration or ultrafiltration may be required. Grit removal technique can be used to remove sand during waste water treatment …show more content…

In general, an activated sludge process includes:
An aeration tank where air (or oxygen) is injected and thoroughly mixed into the wastewater.
A settling tank (usually referred to as a clarifier or "settler") to allow the waste sludge to settle. Part of the waste sludge is recycled to the aeration tank and the remaining waste sludge is removed for further treatment and ultimate

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