Duties of ISKI. To provide drinking water. To collect, treat and discharge wastewater. To protect water resources

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2 The History of ISKI The first water administration in Istanbul was founded in In 1981, Istanbul Water and Sewerage Administration was established with the short name of İSKİ by merging Istanbul's water and sewerage services. İSKİ is a public utility of Istanbul Metropolitan Municipality with an independent budget. A great majority of the income of the administration is from the water sales. Its responsibility area is the whole of Istanbul Province

3 Duties of ISKI To provide drinking water To collect, treat and discharge wastewater To protect water resources

4 General Information for Infrastructure and Budget Serviced Population : million Total Responsibility Area of ISKI : km 2 Number of Subscriber : 6,4 milion Water Network Lenght : km Main Water Network Lenght : km Sewage Lenght : km Main Collector Lenght : km Tunnel Lenght : 201 km Rainwater Network Lenght : km Total Number of Personnel : Total Daily Water Supplied to the City : 2.9 Milyon m 3 /day Total Volume of Water Storage Tanks : m 3 Budget (2018) : TL Investment (2018) : TL

5 Wastewater Treatment Plants Number of WWTP 87 Capacity m 3 /day Budget assigned to WWTPs operation TL Budget for wastewater treatment operation is 4% of total budget

6 thousand m 3 /day SEWAGE SLUDGE MANAGEMENT Water Delivered- Wastewater Treated Treated Wastewater Delivered Water

7 Number of plants SEWAGE SLUDGE MANAGEMENT WWTP`s Process Types Distribution Asian Biological 35 Asian Pre-Treatment Asian Advanced Biological Asian MBR Advanced Biological Europian Biological 20 Europian Pre-Treatment 15 Europian Advanced Biological Biological Pre-Treatment Advanced Biological MBR Advanced Biological Biological Pre-Treatment Advanced Biological Asian Europian Total amount : 87

8 m 3 /day SEWAGE SLUDGE MANAGEMENT WWTP`s Capacity Distribution Biological Pre-Treatment Advanced Biological Asian MBR Advanced Biological Biological Pre-Treatment Advanced Biological Europian Total capacity : m 3 /day

9 How do we manage sewage sludge? Ataköy Advanced Wastewater Treatment Plant Ambarlı Advanced Wastewater Treatment Plant Tuzla Advanced Wastewater Treatment Plant Thickening Anerobic Digestion Dewatering %25 DS Drying %96-98 DS Cement Factory Paşaköy Advanced Wastewater Treatment Plant Dewatering %25 DS Drying %96-98 DS Cement Factory of Lanfill Büyükçekmece Advanced Wastewater Treatment Plant Selimpaşa Advanced Wastewater Treatment Plant Silivri Advanced Wastewater Treatment Plant Çanta Advanced Wastewater Treatment Plant Asian Side Biological Wastewater Treatment Plants Europian Side Biological Wastewater Treatment Plants Dewatering %25 DS Tranfer to big plants or Lanfill Dewatering %25 DS Transfer to big plants

10 Sludge Production DRIED SLUDGE OF WASTEWATER TREATMENT PLANTS (ton dry solid /day)

11 Sludge Process Flow Diagram

12 Sludge Thickening (Centrifugal Decanter) Polyelectrolyte Centrate To the inlet Sludge (1-3 % Dry Solid) Sludge (% 4-6 Dry Solid) Anaerobic digester Purpose; Reduction of sludge volume, Stabilize raw sludge of anaerobic digesters

13 Sludge Digestion Biogas CH 4 (%65) + CO 2 (%35) Heating of digesters & Drying Sludge (4-6 % Dry Solid) Digested Sludge (3-4 % Dry Solid) Sludge Dewatering Heating (35-37 C)

14 Sludge Digestion m 3 /d Average Daily Biogas Production AMBARLI WWTP ATAKÖY WWTP TUZLA WWTP 2017 (Nm3/day) 2018 (Nm3/day)

15 Sludge Dewatering (Centrifugal Decanter) Polyelectrolyte Centrate To the inlet High nitrogen and phosphate loading Digested Sludge (3-4 % Dry Solid) Dewatered Sludge (25 % Dry solid)

16 Sludge Drying Sludge dryers are indirect dryers. The energy required for drying system is met by Cogeneration System. Dewatered Sludge (25 % Dry Solid) Off-Gas Odor Removal Unit Dried Sludge (98 % Dry Solid) Heat Energy (Oil or Steam Heating) Cement Factory Additional fuel

17 Sludge Drying DRYING CAPACITIES OF ADVANCED WASTEWATER TREATMENT PLANTS OF ISTANBUL; Plant Ambarlı WWTP Ataköy WWTP Paşaköy WWTP Tuzla WWTP Number / 1 Capacity (ton/day) Dryer Type Disc Disc Pedal + belt Pedal Wastewater Treatment Capacity of Plant(m 3 /day) Calorific Value of Dried Sludge (cal/g) Plant Wastewater Treatment Capacity of Plant(m 3 /day) Selimpasa WWTP Canta WWTP Silivri WWTP B.cekmece WWTP Treated Wastewater (m 3 /day) Dewatered Sludge Production - 25% DS (kg/day)

18 Future Planning In 2016, studies were carried out for the new sludge management strategy due to increased wastewater treatment plant capacities and increased sludge volume due to increasing population.

19 Future Planning According to the Sludge Master Plan, sludge production potentials will increase with population increase and new wastewater treatment plants.

20 Management Plan According to the Sludge Master Plan; In Europian Side of Istanbul, - Sludge Incineration Plant in Ambarlı WWTP (Sludge has ~30% DS content will be accepted) In Asian Side of Istanbul, - Sludge Incineration Plant in Tuzla WWTP (Sludge has ~30% DS content will be accepted) - Sludge Drying Plant in Paşaköy WWTP will be established.

21 Management Plan The 600 ton / day capacity sludge incineration plant project at the TUZLA WWTP has started. Sludge Incineration Plant/ Planning

22 Management Plan The EIA (Environmental Impact Assessment) procedure has started for sludge incineration plant in AMBARLI WWTP with a capacity of 600 tons / day.

23 Management Plan The selected sludge management scenario for the WWTPs under the responsibility of ISKI. The figures show the sludge amount (ton DS / day) and the ratio of each technology (%) in total amount) DD: Landfill, Cim Yak: Incinerate in cement factory, ISTAC Yak: Incinerate in ISTAC incineration plant, ISKI Yak: Incinerate in planned ISKI incineration plants, AK: Usage in the land

24 THANK YOU.