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SEWAGE WATER TREATMENT - Coggle Diagram
SEWAGE WATER TREATMENT
What is this?
Also known as Wastewater Treatment
Process of removing contaminants
Classified into three types of unit operations
Chemical
Biological
Physical
What are the processes involved?
Primary Treatment
Physical Unit Processes
Removal of suspended solids & organic matters
Effluent contains high amount of organic matter
Screening & Sedimentation
Secondary Treatment
Biological Unit Processes
Removal of biodegradable organic & suspended solids
Common types
Activated sludge, Trickling filter & Oxidation pond
Pre-treatment
Physical Unit Processes
Screening & Grinding
Removal of debris & Rags
Sedimentation & Flotation
Removal of excess oil & grease
Tertiary Treatment
Biological & Chemical Unit Processes
Removal of nutrients, toxic substances, pathogens
Effluent is of high standard & suitable for reuse
Where does it comes from?
Domestic
Storm
Industrial
What are the role of microorganisms?
Anaerobic bacteria
Reduce the volume of sludge & produce methane gas from it
Remove phosphorus in wastewater
Facilitate in decomposition of macromolecules organic matter
Aerobic bacteria
Use free oxygen within the water to degrade pollutants
Produce CO2 & new biomass
Goals
Reduce levels of organic & inorganic materials
Elimate potentially toxic materials
If untreated?
Water pollution
Unpleasant smells and view
Algal bloom/ Eutrophication
Outbreaks of life-threatening diseases such as, cholera & thyphoid