Mr Ryszard RYDSYNSKI - ZWiK Szczecin

Investing in environmental solutions in
wastewater and energy – value added of
using EU/EEA funding for green growth
BSSSC Annual Conference 2012
Lillestrøm, 17th – 19th September 2012
Ryszard Rydzyński
Szczecin Water&Wastewater Works Ltd.
Poland
Plan of presentation
- Investment program for Szczecin (2000-2010)
with total budget 282 mln EUR for water
environment protection
- Soft project PURE-Project on Urban Reduction
of Eutrophication, 2010-2012, 11 partners from
the Baltic Sea Region
- Two waste water treatment plants „Pomorzany –
418 000 PE” and „Zdroje – 177 000 PE” with
green energy production from biogas
- Film (4,5min) „Szczecin wastewater treatment
plants”
The city of Szczecin
• is situated in the NorthWest corner of Poland
• …on the both sides of the
Oder River
• between
western
and
eastern bank of the river
are
situated
industrial
areas.
Szczecin
The city of Szczecin
• Poland’s
seventh
largest city, 377 912
inhabitants
• one of the largest
seaport in Poland
• located on the Oder
River,
about
60
kilometers from the
river’s mouth
• and
about
160
kilometers to Berlin.
2000-2010
Cohesion Fund – co-funded
Szczecin Water Quality Improvement
Programme
Project No. 2000/PL/16/P/PE/016
- The key environmental objective is to
eliminate untreated wastewater
discharges into the Oder River.
- significant improvement of water
quality in the upper river and protect the
ecology of the Oder, the Dąbie Lake and
the Baltic Sea.
- improving the visual and
microbiological quality of the river and
the Dąbie Lake.
- improving the quality and reliability of
potable water supplies to the city
- the Project will contribute to the
reduction of surface-water and
groundwater pollution in the region and
advance the aims of the Helsinki
Conventions and EU directives
The scope of the Project
Construction of the modern Pomorzany
Waste Water Treatment Plant, for the whole
left bank part of Szczecin, together with the
installation for waste utilization, capacity
66 000 m3 per day in dry weather
Modernization of Zdroje Waste Water
Treatment Plant for the right river bank part
of Szczecin, capacity 18 000 m3 per day in
dry weather
Construction of 160 kms of sewerage
systems, also at the housing estates that did
not have and sewerage systems, as well
transmission sewerage systems,
Renovation of 59 kms of old – over 100
years old – sewers,
Construction of 5 modern pumping stations
that pump waste to the waste water
treatment plants with 35 kms pressure
collectors
Programme’s financing
66% of the Programme’s implementation cost is covered by the Cohesion
Fund. The aim of the undertaking is to improve the water supply and
wastewater management for Szczecin.
THE QUALIFIED COST OF WHOLE PROJECT 282,2 mln €
-COHESION FUND
- ZWiK Ltd
66 %
34 %
- ca. 186,2 mln €
- ca. 96,0 mln €
Until 2009…
Helsinki Convention 1992
HOT SPOTS
97 SZCZECIN
97.1 WWTP POMORZANY
97.2 WWTP ZDROJE
East river bank
„Zdroje” Waste Water Treatment Plant
West river bank
Renovation of sewerage system
West river bank
Sewerage Pumping Stations
West river bank
Waste Water Treatment Plant
Potable water
„MIEDWIE” water treatment plant
The results:
Wastewater treatment
1. Designed capacity of wwtp-s:
Pomorzany, 418.000PE, Q = 66.000m3/d (yearly average
daily inflow during dry weather), Qmaxh=5,4 m3/s (max.
hour flow during the rainy weather)
(Zdroje, 177.000PE, Q = 18.000m3/d, Qmaxh=1.500 m3/h max. hour flow during the rainy weather)
2. Designed concentrations of the wastewater at the inlet:
- Pomorzany wątp,
(Zdroje wwtp)
BOD5 - 380 mgO2/l,
590 mgO2/l,
COD - 700 mgO2/l,
935 mgO2/l,
SS
- 270 mg/l,
470 mg/l,
Ntot - 65 mgN/l,
76 mgN/l,
Ptot - 10 mgP/l
16 mgP/l
3. Outlet concentrations (consent acc. to Polish
Environmental Permitting Regulation - a little more
restrictive than Urban Wastewater Treatment Directive ):
BOD5 - 15 mgO2/l,
COD -120 mgO2/l,
SS
- 35 mg/l,
Ntot - 10 mg N/l,
Ptot - 1,0 mg P/l
3.1. Outflow of treated wastewater from Pomorzany to
Odra West river – SNQ=68,0m3/s (SNQ - is the average
yearly low flow in the Odra West river). Outflow of
treated wastewater from Zdroje to Odra East river –
SNQ=158,6 m3/s.
Szczecin – nitrogen reduction
2000
1800
1600
1400
ton/rok
1200
Pomorzany
Zdroje
1000
Szczecin
800
600
400
200
0
2000 rok
2005 rok
2010 rok
Szczecin – phosphorus reduction
300
250
ton/year
200
Pomorzany
150
Zdroje
Szczecin
100
50
0
2000 rok
2005 rok
2010 rok
Main goal
Regarding Helcom Reccomendation 28E/5 in
wastewater treatment plants, with a load of more
than 100 000 PE, should be treated as soon as
possible so that the treatment results in:
• at least 90% reduction of total phosphorus and
concentration ≤ 0,5mg P/l when discharging
directly or indirectly to the marine areas.
Participants, budget
Organisation
Country
Partner budget
1
Union of the Baltic Cities Commission on
Environment Secretariat/City of Turku
FI
553,975.00 €
2
John Nurminen Foundation
FI
681,980.00 €
3
Riga Water Ltd.
LV
408,640.00 €
4
Brest Municipal Unitary Water and
Wastewater Enterprise Vodokanal
BY
446,940.00 €
5
Baltic Marine Environment Protection
Commission HELCOM
FI
184,720.00 €
6
Sewage Management Facilities Lübeck
DE
136,840.00 €
7
Municipality of Gdańsk
PL
61,820.00 €
8
Mariehamn Town
FI
145,560.00 €
9
Järve Biopuhastus
EE
109,790.00 €
10
Jurmala Water
LV
372,860.00 €
11
ZWiK – Water and Sewage Company
of Szczecin
PL
85,490.00 €
Activity, results
Investments: Riga Water, Brest Vodokanal, Jurmala
Water, Mariehamn Town
Workshops: Helsinki, Riga, Tallin, Gdańsk, Lübeck,
Helsinki+St.Petersburg
Technical Audits: at all Partner’s wwtp-s
Reports: Establishment of the Most Feasible Way for
Accelerated Phosphorus Removal for
„Pomorzany” („Zdroje”)
By: John Nurminen Foundation
November 26, 2010
Activity, results
Reports: Proven Standard Practices and Innovative
New Solutions of Sludge Handling in the
Baltic Sea Region
By: John Nurminen Foundation
February 3, 2012
Communication: http://www.purebalticsea.eu
Eutrophication
Future
„Clean Baltic Sea” Programme
„Zdroje” WWTP
WWTP design parameters
WWTP has been designed for 177 000 PE.
Average daily inflow Q =18 000m³/d (13 000m³/d)
Max. inflow during rainy weather Qmaxh=1500 m³/h (3100 m³/h)
Design parameters
Parameters
Raw sewage
concentration
Treated
wastewater
concentration
Designed
% of reduction
Suspended solids
[mg/l]
470 (360,9)
35 (7,2)
92,5
COD [mgO2/l]
935 (940,6)
125 (35,5)
86,6
BOD5 [mgO2/l]
590 (555,3)
15 (9,1)
97,4
Total N [mgN/l]
76 (101,4)
10 (6,5)
86,8
Total P [mgP/l]
16 (12,5)
1 (0,83)
93,7
Digesters
Thickened primary sludge is being stored in sludge holding
tank before fermentation, where it is mixed with waste
sludge and subsequently is pumped to the digester.
q in = 187,3m³/d
DS = 5,8% (3,9%)
V = 3750m³
q out = 187m³/d
DS = 4,1% (2,9%)
Qg = 2990m³/d
Qgmax = 3690m³/d
Biogas holding tank
• Temp. of fermentation is being kept in a range of 33-37⁰C.
After digestion process the sludge is led to centrifuges.
• Biogas from digester is being transferred through sulfur
removal station to the biogas holding tank. Heat produced
from biogas is used for heating purposes as well as for
heating sludge in digester.
V = 1350m³
Sludge dryer
Dewatered sludge is subsequently directed
to the sludge dryer.
q in = 30,2m³/d
DS
in=25%(21,9%)
Twork = 7500h/a
DS out = 90%
(94,2%)
DS out = 7613kg/d
DSout = 2750 t/a
„Pomorzany” WWTP
Design parameters
WWTP has been designed for 418.000 PE
Dry weather inflow:
Q ave d
Q max d
= 66 000 m3/d (55 000m3/d)
= 79 200 m3/d
Max. inflow during rain weather:
Q max h = 27 648 m3/h = 7,68 m³/s
Allowable hydraulic capacity:
Screens:
19 440 m³/h = 5,40 m³/s
Sand traps and further treatment stages incl. secondary
sedimentation tanks:
7 776 m³/h = 2,16 m³/s
Design parameters
Parameters Raw wastewater Permitted treated
concentration
sewage
concentration
Achieved
% of reduction
[mg/l]
[mg/l]
[%]
COD
700(680,5)
125(38,7)
96
BOD5
380(287,8)
15(6,6)
98
SS
270(293,5)
35(8,6)
98
Tot. N
65(72,2)
10(7,3)
88
Tot. P
10(8,7)
1(0,89)
94
Digesters and Gas holding tanks
Mixed thickened sludge from the holding sludge tank is
being pumped into two digesters. While raw sludge is
being pumped into digesters already fermented sludge
is forced out of digester bottom.
q in = 464m³/d
DS = 5,6% (5,14)
V = 2x5070m³
Vg = 2x1500m³
q out = 464m³/d
DS = 3,9% (2,9%)
Qg = 7163 m³/d
Qgmax = 8843m³/d
Belt presses
Sludge dewatering is done by means of four belt
presses. Dewatered sludge is next directed to the
holding tanks and afterwards to the drying and
incineration installation. Alternatively there is a
possibility of using a lime (CaO) to obtain hygienic
sludge and dump it to the containers.
q in = 649,6m³/d
DS in=3,9%
qp= 6kg/tDS (8,1)
Qp= 152,0kg/d
Twork = 5d/7d
q out = 110,8m³/d
DSout=25%(19,7%)
DCaO=100kgCaO/tDS
QCaO =2533kgCaO/d
Drying and Incineration plant
Incineration process is designed to take over the
whole dried sludge from „Pomorzany” and „Zdroje”
wwtp-s.
Drying and incineration process are designed as
autothermic and during normal operation they do
not require any heat to be supplied from external
sources.
Thermal sludge treatment scheme
Dryers
Parameter
Value
(Zdroje)
Drying capacity
(dewatered sludge)
[kg/h]
2 x 1965(1x2000)
Dry matter at the beginning of
process
[%s.m.]
ok. 25(25)
Dryers capacity
(dryed sludge)
[kg/h]
2 x 546(1x556)
Dryers capacity
(ammount of released water)
[l/h]
2 x 1419(1x1444)
Dry matter at the end of process
[%s.m.]
90(>90)
Sludge dryers
q in = 30,2m³/d
DS in=25%(19,7)
Twork = 7500h/a
QM = 2x1906kg/h
DS out = 90% (96,2%)
DS out = 18090kg/d
DSout = 6603 t/a
Drying technical data
Low temp. of operation: 140 -180 ºC
Sludge is formed into „macarons”
Big active surface
Efficient and evenly dried sludge
Two temp. zones
Hot zone (beginning) (140-180ºC)
End zone (75-85ºC)
Steam exchangers are being used to heat air circulating
in each zone.
Air circulates in few cycles through belts in a dryer.
Air movement is being forced by means of circulation
fans outside of drying machine.
Drying technical data
Sludge layer is moving inside the dryer on two stainless
steel belts.
Dewatered sludge is being placed on top belt in the dryer.
Top belt goes both through hot and end zone.
Partly dried sludge (55-65% d.m.) drops from top belt onto
bottom belt.
Bottom belt moves in a opposite direction, approx.3-4 times
slower – sludge is directed towards unloading screw.
Scrapers constantly clean both belts from sludge remains.
Small underpressure is being kept inside the dryer to:
• prevent odours emission and dusting,
• allow operator to open hatch during machine operation.
Sludge incinerators
q in(P+Z) =
26,7t/d(9738t/a)
DS in=90%
Twork = 7500h/a
QM = 2x738kg/h
Slag
qout = 10,8t
Sludge incineration process
Each incineration line consists of two units of mechanical grids (its purpose
is to deliver dry sludge), incineration chamber, end-incineration chamber,
steam boiler and system for ash removal.
Energy required for sludge dying is gained from incineration process.
Sludge incineration furnace is equipped with sloping grid cooled with water.
Thin ash is removed by means of screw conveyor.
Air necessary for incineration process is being sucked by means of 4 fans
from the system of a treatment of the drying air system. Air for primary
incineration is delivered by means of two fans from the bottom of the grid.
Air for secondary incineration is delivered from each side of furnace , above
grid, by means of another two fans.
Walls of the furnace chamber are being cooled by the water.
Waste gas is directed from the end-incineration chamber to the steam boiler
located at the top of furnace. Steam boiler is made as 3-way pipe boiler.
In the steam boiler part of heat from waste gases is transferred to the
heating system that heats sludge during sludge drying process.
Waste gas treatment
Waste gas treatment installation collect furnace gases from thermal
treatment process. It must be compliant with local directives and EU
directive no.UE 2000/76EC before releasing to the atmosphere.
Whole installation consists of two identical lines.
Main part of the installation is a bag filter which eliminates unwanted
particles from waste gas. Before entering to bag filter furnace gas is
being conditioned to lower its temperature. Air acts as a cooland in
this process.
Injection system of activated carbon and sodium bicarbonate befor
bag filter quarantees the fulfilment of pollution limits
such as NOX, SO2, acidic compunds and heavy metals.
Additionally, washer has been installed between the bag filter
and a chimney.
Sludge production [t/year]
25 560
4 764
745
168 200
168 000
raw sludge
thickened sludge
digested sludge
dewatered sludge
1 040 300
dried sludge
slag
Renewable energy contribution, kWh
Energy consumption, kWh/year
Thermal energy consumption, kWh/year
Annual energy balance
Estimated electrical energy consumption
9 800 MWh
Estimated electrical energy production
3 600 MWh
Ammount of purchased electrical energy
6 200 MWh
Income
Production 3 600 MWh
Income from sales of green energy certificates
Costs
Service costs for biogas generators
75 000 €
275 000 €
System CHP (combined heat and power) units
WWTP „Pomorzany" is equipped with three co-generation (CHP) modules
Type: MB3042L3 (one module type: PETRA 300C - Zdroje)
They are adapted to burn WWTP-s biogas of the following parameters (each
of them) :
•
electrical power:
350 kW (250 kW)
•
heat power:
475 kW (321 kW)
•
input power :
945 kW (655 kW)
In total Qtot = 1425kW co-generation modules of the heating agent
parameters (water as a heating agent) 90/70°C.
System CHP unit (module of co-generation)
Boiler-room
Thank you for your attention