Upload
doanxuyen
View
226
Download
3
Embed Size (px)
Citation preview
1
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
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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
2
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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.
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Riga Water technical information
Length of sewage network 1078km 68 sewage pumping stations Average number of employees 900
3
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Wastewater collection and discharge before
the BAS "Daugavgriva" construction
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva historical
information project 1991.
Grand opening ceremony for WWTP
Daugavgriva on 1991.
Process- extended aeration,
nitrification of ammonia
Hydraulic capacity 350000m3/day
4
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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.
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva historical
information project 1991.
Aeration system perforated tube with filtering patrons
5
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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.
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Automātikas shēma esošā
WWTP Daugavgriva reconstruction
project 2001.
6
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Riga WWTP "Daugavgriva" performance
results
0
10000000
20000000
30000000
40000000
50000000
60000000
70000000
8000000019
96
19
97
19
98
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
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.
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Riga WWTP "Daugavgriva" performance
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
19
96
19
97
19
98
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
mg
/l
SS concentration 1996-2011.y.
inlet outlet
7
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Riga WWTP "Daugavgriva" performance
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
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
mg/l
Ptot. concentration 1996-2011.y.
inlet outlet
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Riga WWTP "Daugavgriva" performance
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
8
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Riga WWTP "Daugavgriva" performance
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
19
96
19
97
19
98
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
mg/l
N tot. concentration 1996-2011.y.
inlet outlet
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Riga WWTP "Daugavgriva" performance
results
10,00%
20,00%
30,00%
40,00%
50,00%
60,00%
70,00%
80,00%
90,00%
100,00%
19
96
19
97
19
98
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
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 %
9
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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
10
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva reconstruction
project 2011/2012.
Chosen process- BioDenitro® provided by Kruger
Veolia group including:
Phases processes
ATS system
STAR system
SCADA system 800XA provided by ABB
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva reconstruction
project 2011/2012.
11
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva reconstruction
project 2011/2012.
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva reconstruction
project 2011/2012.
Control logic
Maintenance work register
Instructions Visualization elements
Order forms
Drawings
12
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva reconstruction
project 2011/2012.
Progress pictures
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva reconstruction project
2011/2012.
Progress pictures
13
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
WWTP Daugavgriva reconstruction
project 2011/2012.
Progress pictures
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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.
14
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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
5
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
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Sewage flow measurements inlets of
WWTP
15
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Ferrous sulfate dosage
container
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
PURE project and John Nurminen Fondation
on WWTP Daugavgriva year 2011/2012
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%
4 secondary tanks 40%
2 secondary tanks 20%
16
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Centrifuge for sludge removal
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Centrifuge for sludge removal
17
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
PURE project and John Nurminen Fondation
on WWTP Daugavgriva year 2011/2012
Shēma ar atrašanās vietu kartē
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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.
18
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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%
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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
19
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
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
20
Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)
Thank you for your
attention!