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WATER TREATMENT (:star: BIOLOGICAL TREATMENT (1. Stabilization pond (or…
WATER TREATMENT
:star:
BIOLOGICAL TREATMENT
1. Stabilization pond (or oxidation pond)
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Factor influence:
Aeration time
Temperature
pH
Biological Activity
Remove;
suspended solids
nitrogen
phosphate
pathogen
2. Activated sludge process
use suspended growth of organism to remove BOD and suspended solid
Factor affect:
temperature
return rates
amount of oxygen available
amount of organic matter available
pH
waste rates
aeration time
3. Filtration: Trickling filters
Wastewater is distributed evenly over the surface of the trickling filter media. As the wastewater flows over the surface of the media the organisms in the slime remove the organic matter from the flow.
Oxidation pond are large, shallow ponds designed to treat waste water through the interaction of sunlight, bacteria and algae.
algae grow within the pond and utalize sunlight to produce oxygen during photosynthesis.
This oxygen is used by the aerobic bacteria in the oxidation pond to breakdown the organic waste in the wastewater.
The broken down solids settle down in the ponds, resulting in effluent that is relatively well treated
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PHYSICAL TREATMENT
OBJECTIVES : SCREENING, MIXING, FLOCULATION, SEDIMENTATION, FILTRATION AND FLOWTATION
PRELIMINARY TREATMENT ( SCREENING, SEDIMENTATION, FLOWTATION)
PRIMARY TREATMENT ( SEDIMENTATION/ FLUOTATION )
TERTIARY TREATMENT ( FILTRATION )
PRINCIPLES OF SEDIMENTATION : PARTICLES THAT ARE DENSER THAN WATER WILL BE ABLE TO SETTLE FASTER THAN LIGHTER PARTICLES TO THE BOTTOM OF A TANK DEPENDS ON THEIR SIZE AND DENSITY.
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CHEMICAL TREATMENT
1. Coagulation and flocculation
Coagulants destabilize the forces that keep colloidal solids apart, while flocculants cause them to agglomerate and drop out of solution.
3. Chemical disinfection
Chlorination
Ozonation
Others: UV light
2. Chemical precipitation
:check: the chemical conversion of soluble substances (including metals) into insoluble particles
:check: used to remove dissolved (ionic) metals from solutions
Chelate precipitation
Hydroxide precipitation
