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Project Report

IP 3049 GB

Sewage sludge incineration with household rubbishThe disposal of de-watered sewa-ge sludge is an important pointnowadays in refuse disposal. Avery environmentally-friendly andfavourably-priced possible dis-posal is burning it along with de-watered sewage sludge in house-hold rubbish incinerators.Existing projects show that whenboth are burnt together that thisdoes not lead to higher emissi-ons, that the investment costsare low and that the sludge can

be disposed of in an environ-mentally-compatible manner andeconomically. Putzmeister offersturn-key complete solutions forstorage, transport and the feed-ing of refuse into the combustionchambers.

The disposal of sewage sludgealong with the incineration of hou-sehold rubbish can be integratedboth in newly planned plants aswell as retrofitted in older plants.

The addition of sewage sludge inno way impairs the acceptance ofhousehold rubbish or the dischargeand metering of rubbish into thecombustion chambers. Apart fromthe fact that both are burnt jointly,there is no interface between thedisposal of both.

Whereas the traditional incinerationof sewage sludge (mono incinera-tion) is carried out in fluidized bedincinerators which requires large-

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IP 3049 GB Right to make technical amendments reserved · © 2000 by Putzmeister · All rights reserved · Printed in Germany (20002 Pe)

Messrs Putzmeister AG has sup-plied multiple, turn-key plants forde-watered sewage sludge to beincinerated too in refuse incinerati-on plants. These consist of highdensity solids pumps, silo and deli-very lines including the mountingand setting into operation. Theseplants are working successfully andto the full satisfaction of the custo-mers. The plant components wereindividually matched respectively tothe conditions and requirements ofthe respective incineration plants.

Putzmeister AG

Max-Eyth-Str. 10 · D-72631 Aichtal

PO Box 21 52 · D-72629 Aichtal

Tel. + 49 (0 71 27) 599-0

Fax + 49 (0 71 27) 599-988

Internet: http://www.putzmeister.de

E-mail: PAT@pmw.de

You can find further details on thedifferent components for:

High density solids pump KOSBrochure IP 1082 GB

Silo technologyBrochure IP 2123 GB

Survey on the different operationsBrochure IP 1318 GB

2

Sludge acceptance Combustion

KOS KOS

Refuse bunker

Sludge storage

Reference installations were alsosupplied to:

MHKW Coburg - DKVA Horgen - CHSarcelle, Dinan, Cenon, Astria - FVesforbraending, Vestkraft - DKTaoyan, ROC

2 high density solids pumps KOS 1030 with HA 22 for charging sewage sludge into the refuse incinerator at Dinan, France

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0As the incineration of refuse oughtto be carried out as continuously aspossible so as to avoid peaks intemperature and pollutants, it isimperative that the sewage sludgeis fed uniformly.

The sewage sludge is dischargedout of the silo by a sliding framethat is on the floor of the silo andwhich guides the sludge lyingabove it into the feeding device ofa connected-up high density solidspump.

As solids such as stones, glass andother foreign bodies are found time

and time again in the sludge,Putzmeister recommends the use ofvalve-less high density solidspumps of the KOS series. Due to itsdesign, this pump solution is in theposition to convey foreign bodiesup to a size of 80% of the pipelinediameter. This guarantees the high-est degree of availability of theplant. These transfer tube-control-led high density solids pumps thentake over the conveying of de-water-ed sewage sludge into the combu-stion chamber of the incineratorwhich is frequently several hundredmetres away. If the foreign particlesin the sludge are not required laterthen they can be extracted by asimple “foreign body separatingdevice”.

An important advantage of thepump technology compared to tra-ditional conveying systems is thatsludges with completely differentconsistencies can be pumped andhomogenizing is not necessary. Thehigh density solids pumps requireboth adhesive, fluid, plastic andcompact sewage sludges. As onlyapproximately 10 - 15% of the totalmaterial incinerated is sewagesludge, the fluctuating consistency

of the sludges (they stem partlyfrom different sewage plants) hasno important influence on the cour-se of incineration. The conveyanceof high density solids by pumps iscarried out via a closed and tightlylain pipeline. This means that notjust every odour nuisance is avoi-ded but also the vicinity is not con-taminated which cannot be avoidedwith traditional transport systemssuch as belt or auger conveyors.The length of the delivery line bet-ween the silo and incineration plant

Acceptance area at Sarcelle, France Acceptance silo with 4 high density solids pumps, Type KOS 1040

can be several hundred metres. Itis therefore also dependent uponthe spatial factors on site. As thepipeline can be laid both verticallyand at 90˚ elbows, the delivery lineadapts to the respective buildingstructure within the plant. If especi-ally great distances have to bebridged, then the injection of aboundary layer is recommended.The friction in the pipeline is there-by considerably reduced. At thesame time the necessary deliverypressure sinks so that when sludge

is also conveyed over several hun-dred metres the complete systemconsisting of pump and deliveryline is less used and less drive per-formance is required. Only 0.5% to1% of the total amount to be con-veyed is injected in the form of afluid (polyelectrolyte). One alsolikes to use the boundary layer fluidinjection, by the way, for the con-veying of high-degree de-wateredfilter cake (e.g. 40% dry solids con-tent).

The sludges can be charged byhigh-density solids pump for incine-ration into the incinerator in verydifferent ways. Proven to be techni-cally very favourable is the convey-ing and injection of high densitysolids with the help of nozzles,resp. charging lances:

■ into the shoot, or■ directly into the combustion

chamber.

The optimal charging technologydepends upon the technical factorsof the method such as the percen-tage share of sewage sludge,domestic refuse, the required lossdue to burning, etc.

The high density solids pumpmakes a metered charge of thesewage sludge possible dependentupon the incinerating temperaturein the combustion chamber. Thisleads to an optimizing of the incine-ration process.

60 m3 acceptance silo with injection pump KOS 540 and hydraulic unit HA 45 in the refuse heating andpower station at Vestkraft, Copenhagen

Insulated delivery lines of acceptance to the incinerator building

scale flue-gas dust collection whenthe sewage sludge is burnt alongwith the domestic rubbish, no addi-tional cleaning of waste gases isrequired as the equipment availableis sufficient and can be utilised.

The delivery of the de-wateredsewage sludge is carried out in aseparate acceptance bunker bytruck. The size depends upon theincineration capacity and is usuallybetween 40 - 200 m3. The accep-tance silo is the intermediate stora-ge place, resp. the “buffer” for thesludge that is delivered at irregularintervals.

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The high density solids pump KOS 540 conveysover 80 m into the incinerator of the refuse powerstation at Vestvorbraending, Copenhagen

Injection pump KOS 1030 below the accumulatorsilo at MHKW Coburg

Truck acceptance silo with high density solids pump

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As the incineration of refuse oughtto be carried out as continuously aspossible so as to avoid peaks intemperature and pollutants, it isimperative that the sewage sludgeis fed uniformly.

The sewage sludge is dischargedout of the silo by a sliding framethat is on the floor of the silo andwhich guides the sludge lyingabove it into the feeding device ofa connected-up high density solidspump.

As solids such as stones, glass andother foreign bodies are found time

and time again in the sludge,Putzmeister recommends the use ofvalve-less high density solidspumps of the KOS series. Due to itsdesign, this pump solution is in theposition to convey foreign bodiesup to a size of 80% of the pipelinediameter. This guarantees the high-est degree of availability of theplant. These transfer tube-control-led high density solids pumps thentake over the conveying of de-water-ed sewage sludge into the combu-stion chamber of the incineratorwhich is frequently several hundredmetres away. If the foreign particlesin the sludge are not required laterthen they can be extracted by asimple “foreign body separatingdevice”.

An important advantage of thepump technology compared to tra-ditional conveying systems is thatsludges with completely differentconsistencies can be pumped andhomogenizing is not necessary. Thehigh density solids pumps requireboth adhesive, fluid, plastic andcompact sewage sludges. As onlyapproximately 10 - 15% of the totalmaterial incinerated is sewagesludge, the fluctuating consistency

of the sludges (they stem partlyfrom different sewage plants) hasno important influence on the cour-se of incineration. The conveyanceof high density solids by pumps iscarried out via a closed and tightlylain pipeline. This means that notjust every odour nuisance is avoi-ded but also the vicinity is not con-taminated which cannot be avoidedwith traditional transport systemssuch as belt or auger conveyors.The length of the delivery line bet-ween the silo and incineration plant

Acceptance area at Sarcelle, France Acceptance silo with 4 high density solids pumps, Type KOS 1040

can be several hundred metres. Itis therefore also dependent uponthe spatial factors on site. As thepipeline can be laid both verticallyand at 90˚ elbows, the delivery lineadapts to the respective buildingstructure within the plant. If especi-ally great distances have to bebridged, then the injection of aboundary layer is recommended.The friction in the pipeline is there-by considerably reduced. At thesame time the necessary deliverypressure sinks so that when sludge

is also conveyed over several hun-dred metres the complete systemconsisting of pump and deliveryline is less used and less drive per-formance is required. Only 0.5% to1% of the total amount to be con-veyed is injected in the form of afluid (polyelectrolyte). One alsolikes to use the boundary layer fluidinjection, by the way, for the con-veying of high-degree de-wateredfilter cake (e.g. 40% dry solids con-tent).

The sludges can be charged byhigh-density solids pump for incine-ration into the incinerator in verydifferent ways. Proven to be techni-cally very favourable is the convey-ing and injection of high densitysolids with the help of nozzles,resp. charging lances:

■ into the shoot, or■ directly into the combustion

chamber.

The optimal charging technologydepends upon the technical factorsof the method such as the percen-tage share of sewage sludge,domestic refuse, the required lossdue to burning, etc.

The high density solids pumpmakes a metered charge of thesewage sludge possible dependentupon the incinerating temperaturein the combustion chamber. Thisleads to an optimizing of the incine-ration process.

60 m3 acceptance silo with injection pump KOS 540 and hydraulic unit HA 45 in the refuse heating andpower station at Vestkraft, Copenhagen

Insulated delivery lines of acceptance to the incinerator building

scale flue-gas dust collection whenthe sewage sludge is burnt alongwith the domestic rubbish, no addi-tional cleaning of waste gases isrequired as the equipment availableis sufficient and can be utilised.

The delivery of the de-wateredsewage sludge is carried out in aseparate acceptance bunker bytruck. The size depends upon theincineration capacity and is usuallybetween 40 - 200 m3. The accep-tance silo is the intermediate stora-ge place, resp. the “buffer” for thesludge that is delivered at irregularintervals.

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4

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The high density solids pump KOS 540 conveysover 80 m into the incinerator of the refuse powerstation at Vestvorbraending, Copenhagen

Injection pump KOS 1030 below the accumulatorsilo at MHKW Coburg

Truck acceptance silo with high density solids pump

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2

Project Report

IP 3049 GB

Sewage sludge incineration with household rubbishThe disposal of de-watered sewa-ge sludge is an important pointnowadays in refuse disposal. Avery environmentally-friendly andfavourably-priced possible dis-posal is burning it along with de-watered sewage sludge in house-hold rubbish incinerators.Existing projects show that whenboth are burnt together that thisdoes not lead to higher emissi-ons, that the investment costsare low and that the sludge can

be disposed of in an environ-mentally-compatible manner andeconomically. Putzmeister offersturn-key complete solutions forstorage, transport and the feed-ing of refuse into the combustionchambers.

The disposal of sewage sludgealong with the incineration of hou-sehold rubbish can be integratedboth in newly planned plants aswell as retrofitted in older plants.

The addition of sewage sludge inno way impairs the acceptance ofhousehold rubbish or the dischargeand metering of rubbish into thecombustion chambers. Apart fromthe fact that both are burnt jointly,there is no interface between thedisposal of both.

Whereas the traditional incinerationof sewage sludge (mono incinera-tion) is carried out in fluidized bedincinerators which requires large-

Ill: 1

/144

19-2

, 2/M

S 7

0080

, 3/K

S 6

9815

-1, 4

/144

19-3

, 5/1

4419

-1, 6

/144

53-1

, 7/1

4453

-0, 8

/493

44. 9

/144

19-4

, 10/

1389

3-17

IP 3049 GB Right to make technical amendments reserved · © 2000 by Putzmeister · All rights reserved · Printed in Germany (20002 Pe)

Messrs Putzmeister AG has sup-plied multiple, turn-key plants forde-watered sewage sludge to beincinerated too in refuse incinerati-on plants. These consist of highdensity solids pumps, silo and deli-very lines including the mountingand setting into operation. Theseplants are working successfully andto the full satisfaction of the custo-mers. The plant components wereindividually matched respectively tothe conditions and requirements ofthe respective incineration plants.

Putzmeister AG

Max-Eyth-Str. 10 · D-72631 Aichtal

PO Box 21 52 · D-72629 Aichtal

Tel. + 49 (0 71 27) 599-0

Fax + 49 (0 71 27) 599-988

Internet: http://www.putzmeister.de

E-mail: PAT@pmw.de

You can find further details on thedifferent components for:

High density solids pump KOSBrochure IP 1082 GB

Silo technologyBrochure IP 2123 GB

Survey on the different operationsBrochure IP 1318 GB

2

Sludge acceptance Combustion

KOS KOS

Refuse bunker

Sludge storage

Reference installations were alsosupplied to:

MHKW Coburg - DKVA Horgen - CHSarcelle, Dinan, Cenon, Astria - FVesforbraending, Vestkraft - DKTaoyan, ROC

2 high density solids pumps KOS 1030 with HA 22 for charging sewage sludge into the refuse incinerator at Dinan, France