WaterWaste Treatment Lecture 1

8/18/2019 WaterWaste Treatment Lecture 1

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Presentationon

Waste Water TreatmentProcess

Presented By

Engr.Hassan

Saleemi

Submitted to

Batch=06/CP

Course


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WASTE WATER TREATMENT

PROCESS

Preliminary Treatment

Primary Treatment

Secondary Treatment

Tertiary Treatment


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Waste Water TreatmentProcess


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Removal of waste water

constituents such as rags, sticks,oatable grit, and grease that

may cause maintenance or

operational problem with thetreatment operations, processes,

and ancil1ary systems

reliminary Treatmen


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PreliminaryTreatmentPreliminary treatment consists of following

units• Screening For removal of oating matter.• rit !hamber For removal of sand and grits.• !omminuters For grinding large si"e suspended

solids• Floatation #nits For removal of oil and grease•

Skimming $anks• Flow %easuring units such as partial ume• Pumps• Pre&aeration #nits


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Removal of a portion of thesuspended solids and organic

matter from

the wastewater.

Primary Treatment


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'nhanced removal ofsuspended solids and organicmatter from the wastewater. $ypically accomplished by

chemical addition or (ltrationknown as

!oagulation and Flocculation.

vanced Primary Treatm


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PrimaryTreatmentPrimary treatment consists of followingprocesses)units• Sedimentation Primary Settling $anks• !oagulation Secondary Settling $ank• Flocculation


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Secondary Treatment

Removal of biodegradableorganic matter *insoluble or

suspension state+and suspended solids.

isinfection is also typicallyincluded in thede(nition of conventional

secondary treatment


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econdary Treatment wiNutrient Removal

Removal of biodegradableorganics, suspended solids,

and nutrients -nitrogenphosphorus, or both nitrogenand phosphorus


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SecondaryTreatment

Secondary treatment consists of following

processes.• /ctivated Sludge Process• 0idation Ponds and lagoons• $rickling Filter

Secondary $reatment Process for 2astewater/pplications3• /eration Systems• 4iological $reatment Systems• Sludge and 4io solids Processing Systems


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TertiaryTreatmentRemoval of residual suspended solids-after secondary treatment,

usually by granular medium (ltrationor micro screens. isinfection isalso typically a part of tertiary

treatment. 5utrient removal is oftenincluded in this de(nition


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Tertiary TreatmentTertiary treatment consists offollowin !rocesses and units"• %embrane Filtration and Separation• echlorination and isinfection Systems• Reverse 0smosis -R0 Systems• 7on 'change•

/ctivated !arbon /dsorption• Physical)!hemical $reatment


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#unctions of Water Treatment

$nits$nit Treatment #unction %Removal&Screening Floating matter

Sedimentation Suspended matter

!oagulation Suspended matter, a part of

colloidal matter and bacteria

!hemical methods 7ron, %anganese, etc.

Filtration Remaining colloidal dissolvedmatter, bacteria

isinfection Pathogenic bacteria, 0rganicmatter and Reducing substances

Softening 8ardness

/eration, chemicals use !olour, 0dour, $aste


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9:;

aundry

?itchen

0thers

Source of 'omestic

Wastewater


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Plan of a Ty!ical Waste WaterTreatment Plant


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Primary Treatment

ProcessSedimentation is primarytreatment Process.

Sedimentation is aphysical watertreatment process used tosettle out suspended solids inwater under the inuence

of gravity.


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Removal E(ciency of

Primary TreatmentProcess )

• Removal e@ciency of 4iological

0ygen emand -4. 0.. in primarytreatment process is


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Ty!ical Primary TreatmentPlant with !reliminary

treatment !rocess


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Sedimentation

Tan*


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Secondary TreatmentProcessStabili$ation %onds & Lagoons3

• $he stabili$ation %onds are open owthrough basins speci(cally designed andconstructed to treat sewage andbiodegradable industrial wastes.

• $hey provide long detention periods etendingfrom a few to several days.

• Pond systems, in which oygen is provided

through mechanical aeration rather than algalphotosynthesis are called aerated lagoons.• >ightly loaded ponds used as tertiary step in

waste treatment for polishing of secondary

eBuents and removal of bacteria are called


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Activate SludeProcess7n activated sludge process

wastewater containing organic

matter is aerated in an aerationbasin in which micro&organismsmetaboli"e the suspended andsoluble organic matter.


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Activated slude !lantinvolves)• wastewater aeration in the presence of

a microbial suspension• solid&liCuid separation following

aeration• discharge of clari(ed eBuent• wasting of ecess biomass, and• return of remaining biomass to the

aeration tank.


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Removal E(ciency of

Activated Slude Process)Metal Removal E(ciency

/l DE:;

%o DE:;

/s DE:;

Pb E:&=:;

%n E:&=:;

/g E:&=:;

!d =:;

Fe =:;

!r =:;


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'acultati(e %ond functions aerobically at thesurface while anaerobic conditions prevail at thebottom. $hey are often about 1 to E m in depth. $heaerobic layer acts as a good check against odourevolution from the pond.

Classi+cation of Sta,ili-ationPondsStabili"ation ponds may be aerobic, anaerobic orfacultative. )erobic %onds are shallow ponds with depthless than :.= m so as to maimi"e penetration oflight throughout the liCuid depth. Such ponds

develop intense algal growth. )naerobic %onds are used as pre&treatment ofhigh strength wastes. Such ponds are constructedwith a depth of E.=&=m as light penetration isunimportant.


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A Ty!ical O.idation 'itch


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A /iew of O.idation

'itch


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Tertiary TreatmentProcess

Tric*lin #ilter is an attachedgrowth process i.e. process in which

microorganisms responsible fortreatment are attached to an inertpacking material.

$ertiary treatment process consists of followingprocess.• Filtration Process -$rickling Filter

• isinfection Process


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Removal E(ciencyof Tric*lin #ilter

$he Removal e@ciency of $otal 0rganic !arbon -$. 0.

!. from $rickling Filter isgreater than H:;


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Wor*in of Tric*lin

#ilter


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Tric*lin


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$op view of $rickling Filter


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Than* 0ou

WaterWaste Treatment Lecture 1

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