Riga Water Ltd. - Project on Urban Reduction of ... Gdansk/PRESENTA… · 1 Part-financed by the...

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Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)

PURE –Project on Urban Reduction of Eutrophication

Riga Water Ltd.

Practical experiences on advanced municipal sewage treatment

– PURE FINAL CONFERENCE IN GDANSK, POLAND 16-18.10.2012

[email protected]


Riga Water Ltd. main information year 2011

Service Area 307km2

Inhabitants of Riga around 800000

Number of clients around 17 000

Total drinking water supply 43, 863 million m3

Treated wastewater 50, 761 million m3

Turnover about 40 million EUR

mailto:[email protected]

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Riga Water technical information

Length of water supply network 1391km Two water preparation stations from wells and Daugava river Water amount supplied to the network about 50millions.m3 annually Water production in 2011 was 54 % from surface water sources and 46 % from ground water sources.


Riga Water technical information

Length of sewage network 1078km 68 sewage pumping stations Average number of employees 900

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Wastewater collection and discharge before

the BAS "Daugavgriva" construction


WWTP Daugavgriva historical

information project 1991.

Grand opening ceremony for WWTP

Daugavgriva on 1991.

Process- extended aeration,

nitrification of ammonia

Hydraulic capacity 350000m3/day

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1979.y. Designed project „Mosvodokanalniiprojekt“

1990.-1991.y. It is built in the first round implomentation of the project .

2001.y. WWTP «Daugavgriva» reconstruction, modernization

1.object

2025.y. plans

2.object 2012.y. reconstruction

3.object

WWTP Daugavgriva historical information

project 1991.


WWTP Daugavgriva historical

information project 1991.

Aeration system perforated tube with filtering patrons

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Reconstruction of aeration basins

Reconstruction of biogas extraction

system

Reconstruction of mechanical

pretreatment

Rubber membrane aeration system

Nitrogen removal down to 15mg/l

WWTP Daugavgriva reconstruction

project 2001.


Automātikas shēma esošā


project 2001.

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Riga WWTP "Daugavgriva" performance

results

0

10000000

20000000

30000000

40000000

50000000

60000000

70000000

8000000019

96

19

97

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98

19

99

20

00

20

01

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20

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20

10

20

11

68775778

76437800

74237000

59114170

59191309

58621885

56553763

55095267

56115098

53437175

53639353

57908396

58674942

51956702

56389862

50761087

m3

WWTP «Daugavgriva» Flow 1996-2011.y.



results

28

0

18

7,4

15

3,9

17

1,4

24

5,8

22

0,8

21

3,6

22

7,2

27

3,3

26

3,8

27

7,2

27

6,2

28

0

26

0,2

25

7,9

31

0,7

34

,2

28

,5

16

,6

32

,3

20

18

,6

15

,4

18

,3 51

,3

70

,5

20

,8

32

,9

34

,5

10

,8

6,7

7,1

0

50

100

150

200

250

300

350

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96

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11

mg

/l

SS concentration 1996-2011.y.

inlet outlet

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results

6,9

5,2

5,4

6,3

8,7

7,5

8

7,3

1

7,8

3

8,6

8,5

9

8,7

9

7,7

6

8,4

4

8,7

7

7,8

1

9,4

0

3,3

2,6

2,5

3,2

4

3,3

3,2

1

2,6

2

6,3

5

4,3

6

2,7

4

2,8

3

2,4

8

1,0

2

0,7

1

0,5

7

0

1

2

3

4

5

6

7

8

9

10

19

96

19

97

19

98

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99

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00

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mg/l

Ptot. concentration 1996-2011.y.

inlet outlet



results

139,8

119,5

130,7

145,1

231,3

189

207,9

232,2

248,5

243,7

257,4

263,2

293

298,1

273,2

255,0

20,1

21,1

7,6

4

12,2

14,6

10,4

10,5

10,6

68,6

32,7

13,6

25,1

17,8

7,9

6,9

7,3

0

25

50

75

100

125

150

175

200

225

250

275

300

325

350

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

mg/l

BOD5 concentration 1996-2011.y.

inlet outlet

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results

25,5

23,7

26,7

30

45,9

22,4

2

43,5

50,1

52,1

49,4

54,3

51,9

55,2

57,7

55 58,8

13,8

13,2

14,1

15,6

32

7,5

8

22,2

30,5

42,4

33,6

38,5

39,5

40,6

22,4

18,6

21,0

0

10

20

30

40

50

60

70

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96

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mg/l

N tot. concentration 1996-2011.y.

inlet outlet



results

10,00%

20,00%

30,00%

40,00%

50,00%

60,00%

70,00%

80,00%

90,00%

100,00%

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96

19

97

19

98

19

99

20

00

20

01

20

02

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11

Tre

atm

en

t e

ffic

ien

cy,

%

WWTP "Daugavgriva" treatment efficiency % 1996-2011.y.

P tot.treatment efficiency % N tot.treatment efficiency %

SS treatment efficiency % BOD5 treatment efficiency %

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Pre-Sedimentation

Fe2(SO4)3

Primary

sludge

Sand removal

and pre-aeration

Inlet chamber

Mechanikal Screens

1

2

3

4

5

6Flow in average 100 rail

road tanks per hour

Every day, leaving one 10m3 truck with waste Up to 3000 t/year.

For every

tonne of

waste is

added to

300g. ferrous

sulphate

4.5 hours is

settling just

like coffee

grounds

100 railway tank within an hour!

Riga WWTP "Daugavgriva" wasterwater

treatment system


Output in the Gulf of Riga

2.5 km from the coastline

17 m depth, 2 pipe diameter of

1.6 m

Post-Sedimentation

Effluent

Aeration tanks

Recirculation return sludge

Excess sludge

Contact rezervoir6

7

8 9

10

One middle size building is blown

through in a time of 1 min. through

the rubber cuts, which are

measured in microns. (supply of

air up to 90 thousand. m3/hour,

5m deep, 20800 aeration diffusers

Activated sludge aeration

basins mass of 5 g / l

and a continuous

process 640t circulating

activated sludge

3h is settling of biological sludge

Riga WWTP "Daugavgriva" wasterwater

treatment system

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project 2011/2012.

Chosen process- BioDenitro® provided by Kruger

Veolia group including:

Phases processes

ATS system

STAR system

SCADA system 800XA provided by ABB



project 2011/2012.

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project 2011/2012.



project 2011/2012.

Control logic

Maintenance work register

Instructions Visualization elements

Order forms

Drawings

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project 2011/2012.

Progress pictures


WWTP Daugavgriva reconstruction project

2011/2012.

Progress pictures

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project 2011/2012.

Progress pictures


PURE project and John Nurminen Fondation

on WWTP Daugavgriva year 2011/2012

Exact Sewage flow measurements and steering signals in the main inlets of WWTP;

Chemical dosing point for preprecipitation with Ferric salts sulfate dosage container 32m2 ;

Similar dosage container provided by JNF

Centrifuge for sludge removal 30m3/h.

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Offered solutions for process

improvement

Screens6 pcs

Post-Sedimentation

Sludge dewatering

Effluent

Sludge yield28 000 kgSS/d

BOD < 20 mg/l P < 1 mg/l NH < 10 mg/l

Water quality

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Sludge thickening

Pre-Sedimentation Biological purificationSand removaland pre-aeration3 pcs

Sludge load = 0.06 kgBOD7/kgMLSSd

= 64 000 m3 V = 4 x 16 000 m3 A = 10 x 1256 m2

= 12560 m2Q/A = 0.62 m/h V = 54 636 m3

A = 6 x1256m2 = 7536 m2Q/A = 1,0 m/h

Anoxic zoneV = 19 200 m3

A ero bic zon eV = 44 8 00 m3

Design flow = 7800 m3/h = 180 000 m3/dPerson equivalent = 700 000

Riga pre-precipitation plantwith phosphorus and nitrogen removal

Polymer

Kemwater (PIX-115)

50 g/m3

M

Digestion 3x 4000 m3

Excess sludge 15 400 kgSS/d

M

Recirculation 100%

WWTP „DAUGAVGRIVA”

WASTEWATER TREATMENT SYSTEM

Mechanikal

ScreensSand removal

and pre-aerationPre - Sedimentation

Aeration tanks

Polymer

Primary

sludge

Recirculation return

sludge

Excess sludge

Post -

Sedimentation

Contact

rezervoir

DigestionSludge dewatering

Centripresses

Sludge thickening

Inlet

chamber

3

2

1


Sewage flow measurements inlets of

WWTP

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Ferrous sulfate dosage

container




Pix dosing – precipitation primary settling tanks (1)

Dosing to 4 + 2 primary settling tanks

Flow proportional to inlet flow

Pix dosing – simultaneous precipitation secondary

settling tanks (2)

Dosing to 4 + 4 + 2 secondary settling tanks

Flow proportional to inlet flow

FT

(1) e.g. dosing 50 mg/l

(2) e.g. dosing 25 mg/l

4 primary tanks 66%

2 primary tanks 34%

4 secondary tanks 40%



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Centrifuge for sludge removal


Centrifuge for sludge removal

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Shēma ar atrašanās vietu kartē


According to data the

HELCOM Baltic Sea

Action Plan (BSAP),

the Latvian state to

reduce the

phosphorus load of

300 tonnes / year of

nitrogen load of

2561 tonnes / year.

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After Riga city waste water treatment plant

reconstruction the concentration of pollution in the

Baltic Sea in effluent waters will be significantly

reduced

* Comparison of data, Year 2008

Significant investments for implementation

of HELCOM Recommendations

Parameter Latvia goal for

pollution decrease

BSAP

Pollution load

decrease from Riga*

Total Latvia amount

ratio

Phosphorus ( fact 2011)

300 t/year 116.6 t/year 38.9%

Nitrogen

( target 2013)

2560 t/year 1822 t/year 71.1%


Daugavgriva WWTP Conception of the further plant

extension and development

Comply with the wastewater and sludge quality

requirements

Reduce storm water impact to recipient

Reduce OPEX – chemical consumption

Reduce / avoid carbon dosing for denitrification

Maximize biogas production

Optimize use of existing volumes to avoid

constrution of new tanks

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Riga water network expansion 3.stage

from year 2006 to 2009.

Investments in infrastructure

expansion total 81,2MEUR

EU funding 58,8MEUR

Riga water investments in

infrastructure 2006-2009


Riga water investments in

infrastructure 2012

Water supply network 40km

Sewage network 50 km

Pressure mains 3,7km

Number of Sewage pumping stations 8 pcs

Riga water network expansion 4.stage from

year 2012 to 2014.

Investments in infrastructure

expansion total 39,5MEUR

EU funding 20,7MEUR

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Thank you for your

attention!

Riga Water Ltd. - Project on Urban Reduction of ... Gdansk/PRESENTA… · 1 Part-financed by the...

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