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Pumps and Maceratorsin the Environmental Industry

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seepex pumpsBN 30-6LT withmacerators U 25.Product: digestedsludge to thebelt-presses.

seepex pumpsBN 2-6L. Product:diluted flocculantto dewatering.

Protecting our environment insures the health offuture generations and is one of today's mostimportant issues.

A primary focus is the purification of municipal andindustrial wastewater. This need was recognizedearly in the 20th century in highly populated

Wastewater is pumped to a sewagetreatment plant for cleaning. After thetreatment process is completed, theclean water is put back into the eco-logical system.

Treated, dewatered sludge is depositedin landfills, sent to drying or incinera-tion plants, or used as fertilizer. Waterand sludge quality requirements dependon local and federal regulations.

These regulations are becoming morestringent and are standardized even onan international level.

industrialized countries with the first steps of sewagetreatment. In the last few decades, wastewatertreatment has developed into a major industry withcomplex chemical, biological and mechanicalprocesses.

To meet the demands for neutralizationand filtration, reduction of organicwastes and heavy metals, and theelimination of nitrates and phosphates,sewage treatment plants must adapt toincreasingly rigid standards.

seepex progressive cavity pumps andmacerators are used in almost all processsteps of the sewage treatment plant.

The SewageTreatment Plant

seepex Progressive Cavity Pumpsfor the Environmental Industry

4. Dosing of chemicaladditives

Pumping oflime slurryferric chlorideferro and aluminium saltconcentrated polyelectrolitesand diluted flocculants

5. Sludge drying andincineration

Accurately metering dewateredsludges from silos into dryersor incinerators (see seepexinformation ST)

seepex Pumpsfor the EnvironmentalIndustry

1. Sludge treatment

Pumping ofprimary sludgescumsurplus sludgethickened sludgedigested sludgeas well as sludgecirculation

2. Sludge dewatering

Feeding dewateringdevices

Pumping dewateredsludges with up to35 % ds

3. Dewatered sludge treatment

Pumping and conditioningdewatered sludges with quicklime up to 45 % ds for agricul-tural application

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Underground sewagetreatment at themediterranean coast,built into the rocks.

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H2O

screen/grit removalaeration

H2Opolymer granulate

flocculantconcentrate

primary sludgethickener

Fe/Al-salt

FeCI3

lime slurry

CaO

secondaryclarification

primaryclarification

importeddewatered

sludge

importedsludge

inlet

thickener

seepex pumpsBN 52-6L.Product:digested sludgeto thedewateringcentrifuges.

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aerial view of asewage treatmentplant.

seepex pumpsBTI 10-24.Product:dewateredsludge from thecentrifuges withappr. 20 % ds.

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advanced treatment/MBR

lime silo

centrifuge

heatexchanger

digester

beltpressContainer

SiloStorage

sludgestorage

finalthickener

filterpress

outlet

flocculantsolution

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BN range seepex pumps are ideal fortransporting sewage and sludges ofup to 8 % ds as well as dosing limeslurry and flocculants.Capacity: 0,05 - 500 m3/h(2.2 - 2,200 usgpm),pressure: up to 48 bar (700 psi)

BTQ range seepex pumps are thesame length as the equivalent BNrange pump but with a square suctionhopper that integrates a shortfeed screw for increased volumetricefficiency. These pumps are usedfor pumping thickened sludges upto 12 % ds, scum and grease fromgrease traps.Capacity: 0,1 - 100 m3/h(0.44 - 880 usgpm),pressure: up to 24 bar (360 psi)

BT range seepex pumps have arectangular feed hopper with acompression zone and feed screw.The hopper length can be matched tothe discharge of the feeding device.They are used for pumping thickenedsludges up to 18 % ds.Capacity: 0,1 - 200 m3/h(0.44 - 880 usgpm),pressure: up to 48 bar (700 psi)

BTE range seepex pumps have aenlarged rectangular feed hopperwith removable compression zoneand an auger with enlarged diameterand pitch length. The hopper lengthcan be matched to the discharge ofthe dewatering device. These pumpsare used for dewatered sludges upto 32 % ds.Capacity: 0,3 - 50 m3/h(1.32 - 220 usgpm),pressure: up to 48 bar (700 psi)

BTI range seepex pumps have arectangular feed hopper withremovable compression zone forservice work and an integrated bridgebreaker/mixing device. The hopperlength can be matched to thedischarge of the dewatering device.They are used for pumping andconditioning of dewatered sludgeswith quick lime up to 45 % ds.Capacity: 0,3 - 50 m3/h(1.3 - 220 usgpm),pressure: up to 48 bar (700 psi)

MD range seepex pumps are used forpumping and dosing precipitants andflocculants. Capacity: 0,1 - 1000 l/h(0.00044 - 4.4 usgpm),pressure: up to 24 bar (360 psi)

M Group seepex macerators reducesolids and fibers in raw sewage andsludge into small particles capable ofbeing pumped. They are available in ainline design with integrated separatorfor collecting heavy solids and in anuniversal design for universal mounting.Capacity: up to 150 m3/h (660 usgpm)

The products

range BN

Baureihe MD

range BTQ

range BT

range BTE

range BTI

Baureihe I

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Sludge treatment

Fe/Al-salt

advanced treatment/MBR

aeration

heatexchanger

digester

sludgestorage

finalthickener

primary sludgethickener

secondaryclarification outlet

thickener

FeCI3

flocculant

flocculant

importeddewatered

sludge

9

1

9

2

2

3

8

7

6

4

5

9

primaryclarification

importedsludge

seepex pumps BT 70-12and BN 52-6L. Product:imported dewateredsludge with 30 % dsand primary sludge withappr. 1-2 % ds. Specialty:backmixing of theimported dewatered sludgewith primary sludge up toappr. 6 % ds and pumpingto the digester. The primarysludge is fed into the hopperthrough a sidestream inlet.

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seepex pumpsBN 35-6L andseepex maceratorsI 110. Product:primary sludge tothe digester.Specialty: due to thelimited space in thepump gallery, thepumps are mountedvertically on the wall.

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seepex pumpsBN 130-6L withseepex maceratorsU 110. Product:surplus sludge.

seepex pumpsBTQ 17-12. Product:mechanicallythickened surplussludge with appr.6 % ds.

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seepex dry-running protectiondevice TSE

Diaphragm or annular contactpressure gauge with open flangeto protect against excess pressure

seepex stator retensioning device toincrease the lifetime of the pumpingelements

During mechanical sewage treatment, suspendedsolids settle to the bottom of the clarifier as primarysludge. This sludge can be thickened mechanicallyor by gravity and mixed with biologically treatedsludge. Sludge can also be digested until it is

odorless and chemically and physically stabilized.During anaerobic digestion, organic compoundsbecome non-organic at a fixed temperature ofapproximately 35 °C. Digestion enhances the sludgedewatering/treatment process.

BN range seepex pumps forpumping imported sludgeinto the thickener (5)

BN range seepex pumps forpumping thickened primarysludge into the digester (6)

BN range seepex pumps forcontinuous circulation ofdigested sludges (7)

BN range seepex pumps for pumpingdigested sludge into sludge storagetanks, secondary thickener or directly todewatering (8)

M group seepex macerators for grindingsolids and fibrous material in varioustypes of sludge (9)

Applications forseepex pumps insludge treatment

Typicaloptions

Sludge treatment

BN range seepex pumps for pumpingprimary sludge from the clarifier to thethickener or to be mixed with dewateredprimary sludge (1)

BN range seepex pumps for pumpingsurplus sludge from the secondary orfinal treatment in the aeration tank orto the thickener (2)

BN, BTQ and BT ranges seepex pumpsfor pumping thickened surplus sludgeinto the digester (3)

BT range seepex pumps for backmixingthe imported, dewatered sludges withprimary sludge, then pumping into thedigester (4)

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Sludge dewatering

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centrifuge

beltpress silo

filterpressFPPU

2

1

3

3

1

2

1

seeinformation ST

4

seepex pumpsBN 17-12 andBN 5-24.Product:thickenedsludge to theplate andframe filterpress.

seepex pumpTENS 17-48.Product:dewateredsludge from thecentrifuge with20-25 % ds.

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seepex pumpsBTI 17-48.Product:dewatered sludgefrom the centri-fuge with appr.25 % ds.

Optimal filling of thefilter press withseepex pumps canbe realized withthe seepex controlsystem FPPU.

Following sludge treatment, the next step in volumereduction is sludge dewatering. Using decantercentrifuges, belt presses, filter presses, vacuumfilters and other dewatering machines, the sludge

BN range seepex pumpsto feed dewateringdevices (1)

M group seepex maceratorsto prevent build up of fibrousmatter in digested sludge andfor homogenization (2)

BTE and BTI range seepex pumpsto take dewatered sludge from beltpresses, centrifuges and vacuum filtersto intermediate storage facilities (3)

can be dewatered up to 45% ds. The dewateredsludge may then be used as fertilizer or disposed ofin landfills, thermal dryers or incinerators.

seepex control system FPPU, designgroup CO, for controlling, adjustingand monitoring seepex pumps whilefeeding filter presses (4)

Applications forseepex pumps insludge dewatering

Boundary layer injection systemfor reduction of friction losses,consisting of:seepex boundary layer pump rangeMD/BN, injection piping and valves,injection and pressure indicationmanifold

Ultrasonic sensor for dependable levelmeasurement in the pump hopper

Additional extension hopper as asludge buffer vessel and for mountingof the ultrasonic level sensor

Typicaloptions

Sludge dewatering

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Dewateredsludge treatment

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The treated dewateredsludge is pumped intoa container, silo or tosludge storage beforedisposal.

centrifuge

beltpress

lime silo

container container

SLCO

seepex pumpBTI 10-12. Product:dewatered sludgewith 20 % ds from abelt press. Specialty:the dewatered sludgeis treated with quicklime and the solidscontent is increasedto 35 %. The processis monitored by theseepex control systemSLCO.

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seepex pumpsBTI 17-24.Product: dewateredsludge from a centri-fuge with appr.30 % ds. Specialty:the sludge is treatedin the pump withquick lime and landapplied.

seepex pumpsTINS 70-24.Product:dewateredsludge from acentrifuge.Specialty: thesludge, treatedwith lime, hasappr. 40 % ds andis pumped to asludge silo.

seepex pumpBTI 35-24. Product:dewatered sludgewith appr. 28 % dsfrom the centrifuge.Specialty: in theextension hopper ofthe pump, lime isadded. The sludgewith appr. 35 % ds ispumped to a sludgestorage. The dis-charge pipework isequipped withboundary layerinjection points toreduce the frictionlosses.

Lime silo. Thedosing of quicklime to the pumpfor the treatmentof the dewateredsludge iscontrolled by theseepex control-system SLCO.

Introducing additives into dewatered sludge canimprove its physical and chemical properties.

Requirements differ depending on the disposal site,so treatment systems should be able to adapt tovarious methods of disposal. Dewatered sludgestreated in seepex systems are more adaptablebecause of the consistent nature of both the drysolids content and their shear resistance.

Dewateredsludge treatment

For agricultural use, dewatered sludge is normallytreated with quick lime.

Because of the exothermal reaction of quick limewith water, moisture content is reduced and sludgestructure enhanced. Nutrient enrichment of thesludge with the addition of quick lime makesdewatered sludge more acceptable for agriculturalapplications.

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The complete processis monitored by theseepex controlsystem SLCO.

The sludge in thepump is stabilized andconditioned by addinglime. The dry solidscontent increases up to40 %.

seepex pumpTINS 35-48. Product:dewatered sludgewith appr. 20 % dsfrom the belt press.

Adding quick lime results in a sterile, neutralizedsludge. Minimally, the pH-value should reach atleast 12,5 and the sludge temperature shouldbe 55°C within 2 hours.

Techniques to minimize infection risks throughsewage sludge are included in publications ofCEN (Comitée Européen de Normalisation).

The United States' EPA (Environmental Pro-tection Agency) standards, Part 503 "BiosolidsRules", designate sludges as Class A or Bdepending on their sterility.

Apart from regulations for use of sewage sludgein agriculture, process control regardingsterilization and neutralization during sludgetreatment is also critical.

Dewateredsludge treatment

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Gentle treatment and consistency are ofcritical importance to the structureof sludge. Then, optimal reactionbetween additive and sludge can beassured with complete sterilizationand lasting neutralization.

BTI range seepex pumps, togetherwith the control system SLCO andother options, can fulfill theserequirements. Mixing of lime occurs inthree stages; by means of the paddleshafts of the bridge breaker, of thefeed screw on the coupling rod andduring the pumping process.

Ultrasonic level measurements, com-bined with continuous speed controlof the pumps by the seepex controlsystem SLCO, ensure a constant sludgelevel in the pump hopper for optimalblending of the lime. Importantprocess data are monitored, controlled

and recorded. Process control, necessaryfor sterilization, is guaranteed bymeasuring and recording varioustemperatures.

Functions of the seepex SLCO controlsystem:

speed control of the pump,bridge breaker, lime dosageand boundary layerinjection within setsafety regulationslime dosing proportionalto sludge flowdry run protectionoverpressure protectiontemperature control in thedischarge pipe

The seepexdewatered sludgetreatment system

Dewateredsludge treatment

In BTI range seepex pumps, withintegrated bridge breaker and separableextension hopper, the sludge inlethopper and additive dosing location isadaptable to the site mounting

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requirements. A suitable mounting forthe ultrasonic level sensor is provided,as well as a port for inspection andcleaning.

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Dosing ofchemical additives

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seepex pumpsBN 1-6L. Product:diluted flocculantto the thickener.

seepex pumpsBN 10-6L. Product:circulation of thepolymer solution.

H2O

flocculantsolution

H2Opolymer granulate

flocculantconcentrate

Fe/Al-salt

FeCl3

lime slurry

CaO

1

2

2

3 3

5

4

4

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seepex pumpsBN 05-12. Product:dosing of ferricsulfate forphosphateprecipitation.

seepex pumpBN 10-6L. Product:lime slurry. Specialty:a stator retensioningdevice is fitted tominimize repair costs.

Various organic and inorganic process additives areused in sewage treatment plants to supportbiological and mechanical processes.

Organic process additives, like anionic and cationicpolyelectrolites, synthetic polymers or copolymerflocculants based on Acrylamide, are meteredinto the sewage sludge to aid in the separationprocess.

BN range seepex pumps forcirculating base polymersolution (1)

MD/MDP/MDF range seepexpumps for pumping and dosingflocculant concentrate fromthe supply tote or the basepolymer solution to the dilutionskid (2)

BN range seepex pumps for movingdiluted polymer solution into a daytank, to be dosed into various sludgetreatment processes (3)

Inorganic process additives such as aluminum,calcium and iron salts (precipitants/flocculants) areused for chemical phosphate precipitation andsludge conditioning before mechanical dewatering.

Lime slurry is used for neutralization andimprovement of sludge filtration in filter presses.

BN/MD/MDP range seepexpumps for dosing metalsalts in the separationand sludge dewateringprocesses (4)

BN range seepex pumps formetering lime slurry (5)

Applications forseepex pumps fordosing of chemicaladditives

Dosing ofchemical additives

seepex dry-running protectiondevice TSE

Diaphragm or annular contactpressure gauge for excess pressureprotection

Typicaloptions

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We deliver your success

Your seepex agent

www.seepex.com

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