SISKA LENGGO P. (0811013124)_Wastewater Treatment

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Wastewater treatment

SISKA LENGGO PUTRI0811013124


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Waste water treatment

Physical unit operation Chemical unit operation

Biological unit operation


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Four levels of waste watertreatment

Preliminary treatment Primary treatment

Secondary treatment Tertiary / advance treatment


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Preliminary treatment

Screening coarse solids which mayclog the mechanical equipments andpipes

Communition grinding of coarsesolid into smaller and more uniformparticles

Flotation separation of suspendedand floatable solids particles fromwastewater. By air bubbles

Grit removal


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Primary treatment

Removal of settle able organic solidsby sedimentation and the removal ofmaterials that float (scum) by

skimming


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Secondary treatment

Dissolved and non-settling organicsolid from the primary effluent areremoved. Aerobic Anaerobic Facultative

Stabilitation of organic matter : Respiration Synthesis


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Secondary

aerobic microbiological process (sludge)organic matter + O2 CO2 + NH3

+ H2O

NH3 NO3-

- lowers suspended solids content (intosludge)

aquaticnutrient

Mostly deadmicrobes


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Aerationand rapid

mixing

Settlingcollects sludge

on bottom

Secondaryprocess

airdiffuser

Fro

mp

rimarypro

cess

To

tert

ia

rypr

ocess


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Tertiary treatment

If disinfection is practiced, it isalways the final process. It is alsocalled effluent polishing

Filtration :

Activad carbon removes residual toxins

Lagooning :

Settlement and further biologicalimprovement in man made ponds.

Highly aerobic and colonization by

native macrophytes.


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Levels of Treatment continued

Tertiary (advanced) anaerobic microbiological process with a

different microbe where O2 is toxic (moresludge)

NO3- N2 (escapes to atmosphere)

PO4-3 if not removed in sludge in secondaryprocess

PO4-3 + Al+3 AlPO4 (s) (intosludge)

- aeration to strip N2 and re-oxygenate (add DO)


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Slow mixingto keep suspended and

O2 out

Settlingcollects sludge

on bottom

Tertiaryprocess

Fro

ms

econdaryprocess

Effluen

t

add methanol as food source


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Why treat wastewater?

Causes a demand for dissolvedoxygen (lower DO levels of streams)

Adds nutrients (nitrate andphosphate) to cause excessive growth

Increases suspended solids orsediments in streams (turbidityincrease)


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When the treatment isdone

Effluent back to stream after a final carbon filtration and chlorination/dechlorination

Sludge very nutrient rich applied directly to land as fertilizer

incinerated (good fuel after drying) composted (Compro from WSSC)

SISKA LENGGO P. (0811013124)_Wastewater Treatment

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