Szczecin Waste Water Treatment Plants Practical experiences on advanced municipal sewage treatment PURE Final Conference

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1 Zakład Wodociągów i Kanalizacji Sp. z o.o. w Szczecinie Water and Sewage Company of Szczecin Ltd. PURE Project on Urban Reduction of Eutrophication Szczecin Waste Water Treatment Plants Practical experiences on advanced municipal sewage treatment PURE Final Conference Gdańsk, Ryszard Rydzyński, Head Development Specialist of ZWiK Photo:Lehtikuva/Yuri Belinsky Plan of presentation - Investment program for Szczecin ( ) with total budget 282 mln EUR for water environment protection - Two waste water treatment plants Pomorzany PE and Zdroje PE with green energy production from biogas - Film (4,5min) Szczecin wastewater treatment plants 1

2 The city of Szczecin - is situated in the North-West corner of Poland on the both sides of the Oder River West and Oder River East, - between western and eastern banks of the rivers are situated industrial areas Szczecin The city of Szczecin Poland s seventh largest city, 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. 2

3 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 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 66 % - ca. 186,2 mln - ZWiK Ltd 34 % - ca. 96,0 mln 3

4 Zdroje WWTP 4

5 WWTP design parameters WWTP has been designed for 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 BOD 5 [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 5

6 Pomorzany WWTP Design parameters WWTP has been designed for PE Dry weather inflow: Q ave d = m3/d (55 000m3/d) Q max d = m3/d Max. inflow during rain weather: Q max h = m3/h = 7,68 m³/s Allowable hydraulic capacity: Screens: m³/h = 5,40 m³/s Sand traps and further treatment stages incl. secondary sedimentation tanks: m³/h = 2,16 m³/s 6

7 Design parameters Parameters Raw wastewater concentration Permitted treated sewage concentration Achieved % of reduction [mg/l] [mg/l] [%] COD 700(680,5) 125(38,7) 96 BOD 5 380(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 Szczecin nitrogen reduction 7

8 Main goal Regarding Helcom Reccomendation 28E/5 in wastewater treatment plants, with a load of more than 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. Szczecin phosphorus reduction 8

9 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 9

10 Sludge dryers q in = 30,2m³/d DS in=25%(21,7) Twork = 7500h/a QM = 2x1906kg/h DS out = 90% (96,2%) DS out = 18090kg/d DSout = 6603 t/a Sludge incinerators q in(p+z) = 26,7t/d(9738t/a) DS in=90% Twork = 7500h/a QM = 2x738kg/h Slag qout = 10,8t/d 10

11 Renewable energy contribution, kwh Energy consumption, kwh/year 11

12 Annual Energy Consumption for Zdroje WWTP produced energy purchased energy 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) The heating agent parameters (water as a heating agent) 90/70 C. 12

13 System CHP unit (module of co-generation) Boiler-room 13

14 Thank you for your attention 14

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