Case Study: The Approach of a Large Utitility to Optimise the WWTP - the Hamburg Example: How to Achieve Energy-Self-Sufficiency

Transcription

1 Municipal Infrastructure Conference: Efficient Use of Energy in Water Supply and Wastewater Disposal - Southeast Europe and Turkey Case Study: The Approach of a Large Utitility to Optimise the WWTP - the Hamburg Example: How to Achieve Energy-Self-Sufficiency Frankfurt, 26. November 2013 Christian Günner, HAMBURG WASSER

2 The founding of HAMBURG WASSER HAMBURG WASSER was created on January 1, 2006, through the unification of Hamburg Wasserwerke GmbH (Hamburg Water Works, HWW) and Hamburger Stadtentwässerung AöR (Hamburg Public Sewage Company, HSE) HAMBURG WASSER is Germany s largest public owned water supply and wastewater disposal company Drinking water supply in Hamburg and 20 cities and surrounding communities as well as 4 further distributors Waste water disposal in Hamburg and 30 cities and surrounding communities, and long-term contracts with 15 communities for technical and commercial services Business acquisition basis for Northern Germany and selected international markets Folie 2

3 HAMBURG WASSER (2012) Some data about networks: Central Plants Investments development since 1845 (first design of Sir William Lindley) 5,360 km of pipes for potable water > 1,099,750 pieces of water meters 5,764 km of sewers (up to DN 3500) 16 WW: water production 110 Mio. m³/a 2 WWTP: 2.4 Mio. PE, treated sewage 140 Mio. m³/a Networks, plants and others: Depreciation of networks: 142 Mio. /a 77 a 125 a Since split sewage fee Fee for household waste water: 2.09 /m³ Fee for sewage from stormwater: 0.73 /m² Price for potable water: 1.61 /m³ /month (per flat/ household meter) Folie 3

4 2 Stage WWTP Köhlbrandhöft/ Dradenau Site Map North WWTP Köhlbrandhöft South WWTP Dradenau Folie 4

5 Sewage Treatment Plant Köhlbrandhöft Klärwerk Köhlbrandhöft Mechanical und Biologic Sewage Treatment, Sludge Treatment Folie 5

6 Sewage Treatment Plant Dradenau Klärwerk Dradenau Biologic Treatment (II. Stage) Folie 6

7 Wastewater Parameters wastewater inflow: 139,5 Mio. m³/a population equivalents: 2,4 Mio. PE Data: ,0 800,0 824 inflow effluent conce entration [mg/l] 700,0 600,0 500,0 400,0 300,0 200,0 403 permissible drainage value 100,0 0, , ,7 1 COD BOD N-ges N-anorg NH4-H P-ges Folie 7

8 Process Optimisation of WWTP Köhlbrandhöft/ Dradenau N-Effluent Concentration and Elimination Rate 15 85% 14 84% Nitrogen n-concentration of Plant Effluent [mg/l] % 82% 81% 80% 79% 78% 77% Elimination Rate [%] 6 76% % Ntot Nanorg [mg/l] Folie 8

9 Energy targets of HAMBURG WASSER Integrated in the climate protection concept of the City of Hamburg: Energy self-sufficiency of WWTP from 2011 Energy self-sufficiency of HAMBURG WASSER from 2018 Reduction of carbon emission to < t/a from 2018 For us Energy self-sufficiency means: In an annual balance, the amount of renewable energy production on the ground of the WWTP shall reach or exceed the amount of energy consumption of the WWTP. Folie 9

10 Before Sludge Incineration Plant VERA Initial situation % 37% 51 % G 172 GWh Digester Gas Digested sludge Sludge dewatering and drying Sludge to landfill 18,1 GWh Electricity Folie 10

11 With Sludge Incineration Plant VERA VERA % 94 % 2 % 172 GWh Digester Gas Digested sludge Sludge dewatering and drying VERA Sludge to incineration Steam G G Gasturbine Steamturbine Incineration 41 GWh Electricity Folie 11

12 Sludge Incineration Plant VERA - Today VERA % 94 % 2 % 214 GWh Digester Gas Digested sludge Sludge dewatering and drying VERA Sludge to incineration Steam G G Gasturbine Steamturbine Incineration 63 GWh Electricity Folie 12

13 Electricity consumption of WWTP Köhlbrandhöft Aeration incl. Sludge Liquor Treatment 60% Final Sedimentation 2% Sludge Thickening 6% Sludge Digestion 3% Primary Sedimentation 1% Grit Chambers 2% Screens 1% Pumping Stations 14% Others 4% Sludge Dewatering 4% Thermal Sludge Drying 4% 100% in 2009: 93,5 Mio. kwh Folie 13

14 Project: Energy-neutrality of the central WWTP Measures Reducing power consumption Increasing power production Delivery of surplus energy Replacement of surface aerators by fine bubble aeration WWTP Dradenau power savings: about 50% Investment: 20.9 Mio. Reduction of power consumption by 18.2 Mio. kwh p.a. Building of 2 wind turbines and 2 photovoltaic parks Total investment: 9 Mio. Power production: 15 Mio. kwh p.a. Local heat supply for neighboring container terminal Tollerort Upgrading of digester gas to natural gas quality Feed of the bio-methan into the public grid Investment: 2.7 Mio. Energy supply: 16 Mio. kwh p.a. Folie 14

15 Saving Potential and Energy Production icity demand / Surplus [GWh/a] Electricity supply to WWTP VERA 103,6 103,5 104,2 95,6 91,7 89,2 92,2 95,2 93,0 104,1 94,6 98,0 100,2 97,7 Aeration System 93,5 2 Wind Turbines 85,0 Biogas 79,9 Forecast 3rd Wind Turbine Electri Mains supply Surplus energy Supply f rom VERA Supply f rom gas-engines Wind turbines Decentralized biogas-usage Energy consumption Folie 15

16 Economic Benefit Electricity price and electricity costs(2007 = 100 %) 200% 150% 100% 50% 0% Electricity Price and Electricity Costs of HSE 169% 133% 138% 142% 116% 100% 106% 82% 72% 60% 61% 58% 59% Electricity price Electricity costs incl. depreciation Folie 16

17 120 Economic Benefit Energy costs for waste water treatment Forecast 8 7 Over all energy costs [Mio. /a] Energy consumption Folie Electricity demand / Surplus [GWh/a]

18 Economic Benefit Energy costs for waste water treatment 120 Forecast 8 7 Electri icity demand / Surplus [GWh/a] Combined solution for economic and ecologic needs Ove er all energy costs [Mio. /a] Energy consumption Energy costs Folie 18

19 Contact Christian Günner Hamburg Wasser, Division Planning and Technology Development Billhorner Deich 2, D Hamburg Thank you for your attention! Folie 19