Central Wastewater Treatment Plant energy efficient operation and experiences

H-1134 Budapest, Váci út 23-27. Adress: 1325 Bp., Pf.: 355. Phone: 465 2400 Fax: 465 2961 www.vizmuvek.hu [email protected]

Central Wastewater Treatment Plant energy efficient operation and experiences

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EWA SPRING DAYS 2015 Conference Budapest Water Conference Budapest, 3-6.03.2015

Agenda

1. Background of the Budapest Central Wastewater Treatment Plant (BCWWTP) 2. Plant description – Main characteristics 3. Datas from the operation

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Waste and rainwater catching areas

IV III

XV

Észak-Pest 200 000 m3/day XIII (1980)

II

XIV XII

I

V

XVI

VI VII VIII XVII

XI

IX XIX

Dél-Pest XVIII 80 XX 000 m3/day CSEPEL XXI (1966) XXII m3/day 300 000 XXIII (2010) 3

LIVING DANUBE Project Basic Data of the BCWWTP: • Capacity: 1,6 M population equivalent • Wastewater quantity: 350 000 m3/day • Max. wastewater quantity: 900 000 m3/day (10.4m3/s) ~ 95% of yearly received wastewater biologically treated • Average daily received wastewater quantity in 2014: 239 000 m3

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Fővárosi Vízművek Zártkörűen Működő Részvénytársaság • www.vizmuvek.hu • [email protected]

Main characteristics • Covered and ventilated process structures • Extracted air treated by biological and chemical odour treatment units • Architecture and Landscaping fits to surrounding area (70% of the plant is GREEN) • Biogas used for energy production and heating (~60% recovery of electricity consumption)

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Treament flow chart Ferencv

Pumping station

Kelenföld

Pumping station

ár os

Polymerisation 2 units

Grit

FeCl3 Rain Water Thickener (4 Units)

Screenings

26 250 m3/h

SEDIPAC 3D® Grit removal, fat flotation, Primary sedimentation) 7 (+1 reserve) units

4 375 m3/h 21 875

m3/h

BIOLOGICAL TREATMENT (pre-anoxic, anaerobic, aerobic/anoxic zone) 17 (+1 reserve) units CLARIFIERS 17 (+1 reserve) units

Conveyor 2 Deposition + Compactor 2

Grit

Grit classifier 2 db

Greace

Greace evacuation

PASTEURISATION 2 (+1 reserve) lines 1 line = 3 tanks

DIGESTED SLUDGE TANK NITROGEN REMOVAL (DEMON) (2 Units)

Outlet to Danube N30 P2

Biogás holder 2

Ferric-chloride dosing

Sludge

Poly

COGENERATION 2 (+1 reserve) lines

TERMOFIL ANAEROBIC DIGESTERS 3 reactors

Sludge

FeCl3

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Deposition

Sludge, NO3 Recirculation

11 250 m3/h GRIT REMOVAL 3 Units

MIXED SLUDGE TANK 1 tank

37 500 m3/h FINE SCREENS (3 mm) 6+2 units

BY PASS

DRAINING TABLES 5 (+1 reserve)

BIOLOGICAL SLUDGE THICKENER

Autosampling ponit Flow meters

GRAVITATY THICKENERS 2 (+1 reserve)

CENTRIFUGE 2 (+1 reserve)

DEWATERED SLUDGE TANKS 4 TANKS

Ferric-chloride dosing POLYMERISATION 2 units

Recultivation (Mun)


Mechanical treatment

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Primary Sedimentation SEDIPAC 3D (8) Compact device • Grit removal • Grease removal • Lamellar settling

TSS removal efficiency 65 – 70% 8


Biological treatment

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Pre-anoxic 10

Anaerobic

Pre-anoxic

Biological treatment

Anoxic/Aerobic

Secondary Clarifier

Secondary Clarifier Anoxic/Aerobic Anaerobic


Biological reactor (18) Aerobic/Anoxic zone Anaerobic zone

Pre-anoxic zone 11


Inlet – Outlet values Average: Inlet: 295,2 mg/l Outlet: 0,9 mg/l

Average: Inlet: 328,7 mg/l Outlet: 0,15 mg/l

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13




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NO3 recirkulation and DEMON start up Average: Inlet: 58 mg/l Outlet: 10,2 mg/l

Trial period 3rd phase

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NO3

16

recirkulation and DEMON start up





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Treated water characteristics

Parameters (mg/L)

Water Operating Permit

Average

COD

125

< 33

BOD5

25

< 10

TSS

35

4,3

TN

30*

10,2

TP

2*

1,05

Raw Water Flow Rate (m3/d)

300 000

235 412

*From the end of 2013, TN < 10 mg/L, TP < 1 mg/L 18


Biological sludge VS% Average: VS: 72,2 % Average: Aerated sludge age: 7,3 days

Average: VS: 70,4 % Average: Aerated sludge age: 7,1 days

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Sludge line

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Thickening Biological Sludge

Primery Sludge

Pressing zone Sludge feeding

Moving scraper system Thickened sludge evacuation

Continuous belt washing Filtrate and washing water zone collection pan

Concentration:

55 – 60 g/l

45 – 50 g/l

Daily thickened volume:

900 m3/d

520 m3/d

VS content:

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75%

Filtrate withdrawal Adjustable feet

76%


Sludge treatment • Digestion system (3 x 6050 m3) • Thermophilic anaerobic digestion at 55ºC – VS removal: 50%

• Minimum SRT ≅ 12 days • Daily feed:1500 m3/d

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DIGESTERS


Digesters sludge Vs load, biogasproduction

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Digesters, Feeding-VFA-TAC

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Digesters SRT

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Biogas production VS kg destroyed

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Primery-, Biosludge ratio biogasproduction

1,03

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1,02

1,03

1,08

1,07

1,11


Cogeneration

• Biogas holders

• Double membrane system • Capacity 2x3500 m3 • Pressure 25 mBar • Increased to 120 mBar before the engines • Activated carbon filter – remove: siloxanes – H2S <120ppm

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Sludge dewatering Centrifuges (3 units + 1)

DS (average) g/L: Incoming sludge: Primary sludge: Biological sludge: Thickened sludge: Digested sludge: Dewatered sludge:

0,2 26 10 - 12 50 - 60 30 min. 270

Sludge quantity (average, 2014): Primary sludge: Biological sludge: Mixed sludge: Dewatered sludge : 29

2900 m3/d 3200 m3/d 1440 m3/d 160 t/d


Biogas engine - Cogeneration

• 2+1 gas engine 1,4MW/unit • ~ 25 000 Nm3/d biogas • ~ 56 000 kWh/d energy

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•

The waste heat is used to heat the sludge during the digestion process

•

The cogeneration insures 60% self-efficiency

Biogas and electricity values

Average: Biogas: 24800 Nm3/d Electr.: 55400 kWh/d

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Self - efficiency

2013: without biologie ventilation 69% 2014: without biologie ventilation 65% Self efficiency

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kWh/treated water

2010

49,2%

0,4573

2011

58,2%

0,4296

2012

59,5%

0,4252

2013

61,1%

0,4027

2014

57%

0,4343


Sludge dewatering

Average: 10,6 kg/t

Average: 11 kg/t

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Future projects • Archimedes turbine • Heat pump • Cell disruption

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Thank You for the Attention

Bence Márialigeti

László Váci

Sewage Operations Director WATERWORKS OF BUDAPEST I FŐVÁROSI VÍZMŰVEK ZRT. Budapest XIII., Váci út 23-27. I Postal address: H-1325 Budapest, Pf. 355 TEL: +36 1 883 3809 FAX: +36 1 883 3801 MOBILE: +36 30 228 8492 E-MAIL: [email protected] WEB: www.vizmuvek.hu

HEAD OF SEWAGE OPERATIONS DEPARTMENT WATERWORKS OF BUDAPEST I FŐVÁROSI VÍZMŰVEK ZRT. Budapest XIII., Váci út 23-27. I Postal address: H-1325 Budapest, Pf. 355 TEL: +36 1 883 3803 FAX: +36 1 883 3801 MOBILE: +36 30 738 1790 E-MAIL: [email protected] WEB: www.vizmuvek.hu

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Central Wastewater Treatment Plant energy efficient operation and experiences

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