waste water treatment process

WASTEWATER TREATMENT PROCESS AND THE

IMPORTANCE

NOR UBAIDIHA BINTI MOHD HASAN12410CIVIL ENGINEERING

Will you dare to use it without treatment??

OBJECTIVES

• To give information and elaboration on how the wastewater treatment process.

• To expose about the importance of wastewater treatment process

WASTEWATER??Figure 2 : Sample of sewerage

• “Used” water deposited into drains by domestic (residents and businesses )

• Down the sink or toilet and travels through underground pipes (sanitary sewer system)

• A mixture of domestic

sewage

WASTEWATER TREATMENT FLOW DIAGRAM Collection

Preliminary treatment

Primary treatment

Secondary treatment

Tertiary treatment / Disinfection

Clean water discharged to the water stream

1. CollectionFigure 1 : Sample of domestic sewerage

• Sewer system is completely gravity powered

• Sewer mains flow into progressively larger pipes until they reach the wastewater treatment plant.

2. Preliminary treatmentFigure 3 : Bar screen used in preliminary

treatment

• Bar screen to remove large solid objects (sticks and rags)

• Grit tank to allow sand, gravel, other material that not to be caught by the bar screen to settle to the bottom.

• Debris is disposed of at a sanitary landfill or recycled.

3. Primary treatmentFigure 4 : primary settling tank

Figure 5 : primary sedimentation tank

primary settling tank and primary sedimentation tank :

• physical separation of solids and greases

• solid particles of organic material are removed

4. Secondary treatmentFigure 6 : Aeration tank • Biological treatment

process

• Removes dissolved organic material and suspended organic solids

• In aeration tank

5. Tertier treatment / DisinfectionFigure 7 : UV Radiation Instrument

• Chlorine and ultraviolet disinfection are the most widely used

• Disinfection using chlorine to reduce pathogens.

• Exposing contaminated water to radiation from UV light

6. Discharged • Treated water discharged

• To the water stream

• Safe for rivers

• Safe for aquatic organisms

IMPORTANCE OF WASTEWATER TREATMENT PROCESS

Eliminating the discharge of pollutants

Obtaining water quality

removes physical, chemical and biological contaminants

CONCLUSION• Wastewater treatment process

i. Collectionii. Preliminary treatmentiii. Primary treatmentiv. Secondary treatmentv. Tertiary treatment /

Disinfectionvi. Clean water discharged to the

water stream

• The importance of wastewater treatment process

Eliminating the discharge of pollutants

Obtaining water quality removes physical, chemical

and biological contaminants

– Wastewater Engineering Treatment and ReuseMetcalf & Eddy, Fourth Edition, Mc Graw Hill

– http://www.ordainternational.org/pages/water.html– http://

www.ci.gillette.wy.us/util/StonepileSelectCompost.pdf

– http://www.regulatorystaff.sc.gov/– http://ezinearticles.com/?Importance-of-Wastewater

-Treatment&id=734605

THE ENDQ & A SESSION