ATHENS WEEK IN PARIS 22 November 2012

Transcription

1 ATHENS WEEK IN PARIS 22 November 2012 MANAGEMENT EXPERIENCE OF AGBAR WATER. Pere Verger Cortés

2 1. INTRODUCTION TO WATER SUPPLY IN BARCELONA 2. NEW TREATMENTS IN WTP 3. NEW SOURCES FOR SUPPLYING 4. ARTIFICIAL RECHARGE IN THE BARCELONA AREA 5. RECHARGE BASINS 6. WATER REUSE

3 OUR HISTORY Compagnie des Eaux de Barcelone is founded in Liège 1867 Compagnie des Eaux de Barcelone is purchased by French capital and Société Générale des Eaux de Barcelone is set up Catalan investors purchase the French company, which becomes Sociedad General de Aguas de Barcelona Corporación Agbar is created, which comprises different economic sectors, such as drinking water supply, wastewater or construction, the beginning of the Agbar Group 1983 Aguas de Barcelona constitutes the Holding Aplicaciones del Agua S.A The international expansion begins 1987 Agbar absorbs Corporación Agbar and Aplicaciones del Agua and extends its services to new activities 1992 Suez absorbs Agbar 2010

4 WATER CYCLE MANAGEMENT SUPPLYING Reservoir management Restitution to the environment Catchments Reutilization Potabilisation Treatment Desalination Transport and Stock Sewerage SANITATION Distribution and Consumption

5 AGBAR DRINKING WATER BUSINESS IN THE WORLD SPAIN 12, hab. U.K. Bristol 1, hab. MEXICO Saltillo hab. CUBA La Havana/Varadero hab. ALGERIA Oran hab. CHINA COLOMBIA Cartagena hab. CHILE Santiago hab.

6 AGBAR DRINKING WATER BUSINESS IN SPAIN Galicia Cantabria País Vasco Navarra Catalunya Castilla y León Madrid Aragón 50 % IN CATALUNYA Extremadura Castilla - La Mancha Comunidad Valenciana Baleares Andalucía Murcia 25 % IN SPAIN Canarias 25 % IN SPAIN

7 HYDROGRAPHIC SYSTEMS MANAGEMENT IN CATALONIA Ter Ter --Llobregat Llobregat System System

8 TER-LLOBREGAT SYSTEM The Ter - Llobregat System supplies drinking water to more than 100 municipalities of Barcelona and Girona provinces. The Ter - Llobregat System has a complex set of facilities of catchment, WTP, tanks, pumping stations and distribution network that allow the water coming from Ter and Llobregat rivers reaches all municipalities with optimum quality for human consumption. > 5,5 million inhabitants served Source: web ATLL

9 TER-LLOBREGAT SYSTEM Water reservoirs capacity Llobregat 214 hm 3 Ter 398 hm 3 Ter - Llobregat 612 hm 3 LA LLOSA DEL C. 80 hm 3 LA BAELLS 109 hm 3 SAU 165 hm 3 Yearly demand (hm 3 ) Water demand: 370 Irrigation: 170 Environmental flow: 100 WTP ABRERA SANT PONÇ 24 hm 3 WTP ST. J. DESPÍ WTP CARDED EU BESÒS AQUIFER SUSQUEDA 233 hm 3 Total demand 640 hm 3 LLOBREGAT AQUIFER Des. Plant Barcelona Nº of supplied inhabitants Nº of supplied municipalities 23 Distribution network length km Mediterranean Sea Daily average consumption hm 3

10 SUPPLY NETWORK WTP ABRERA FONTSANTA m ( m 3 3 )) WTP CARDEDEU TRINITAT II II 100 m ( m 3 3 )) WTP ST. JOAN DESPÍ WELLS AQUIFER LLOBREGAT WELLS AQUIFER BESÒS DESALINATION PLANT 60 hm 3 /any

11 BARCELONA CONTEXT: GENERAL INSTITUTIONAL FRAMEWORK EMA: Environment Entity of Barcelona Metropolitan Area The EMA is local entity created by the Catalan Parliament for Barcelona Metropolitan Area (3,2 million inhabitants served and 33 municipalities). The EMA manages the water supply in the Barcelona metropolitan area, and therefore regulates the quality of the service, the price and the investments of suppliers. Responsibility: Water supply Wastewater treatment Urban waste treatment Source: Aigües de Barcelona 2009

12 EVOLUCIÓ DE LES RESERVES EMBASSADES EVOLUTION OF THE DAMMED RESERVATIONS hm ALERT ALERT ALERT ALERT ALERT ALERT Sant Ponç - La Baells - La Llosa del Cavall (213 hm 3) Sau-Susqueda (398 hm 3)

13 Sau reservoir on the Ter river DROUGHT IN CATALONIA 2007/08

14 DROUGHT (June 1999)

15 DROUGHT... (June 1999)

16 ... AND FLOODINGS (June 2000)

17 BARCELONA SUPPLY DEFICIENCIES LACK OF OF AVAILABLE FLOWS TO TO GUARANTEE THE THE DEMAND PERMANENTLY 6 drought episodes in in years years (the (thelast last4 in in only only10 10 years) years) PROBLEMS RELATED WITH WATER QUALITY IN THE ORIGIN PROBLEMS RELATED WITH WATER QUALITY IN THE ORIGIN INCREASE OF DEMAND PREDICTED IN THE FUTURE INCREASE OF DEMAND PREDICTED IN THE FUTURE VULNERABILITY OF OF THE THE SYSTEM RISKS IN IN THE THE SUPPLY SOLUTIONS

18 APPLICATIONS OF ADVANCED TREATMENT TECHNOLOGIES Treatment of sea water by reverse osmosis. Desalination Plant of the metropolitan area of Barcelona (60 hm 3 /year). Partial treatment of surface waters of the Llobregat river in Sant Joan Despí WTP by means of reverse osmosis (75 hm 3 /year) to improve water quality. Recovery of underground waters from the aquifer of the Besòs delta by means of nanofiltration and reverse osmosis (12 hm 3 /year). Recovery of other underground sources by reverse osmosis and/or stripping (10 hm 3 /year)....

19 1. INTRODUCTION TO WATER SUPPLY IN BARCELONA 2. NEW TREATMENTS IN WTP 3. NEW SOURCES FOR SUPPLYING 4. ARTIFICIAL RECHARGE IN THE BARCELONA AREA 5. RECHARGE BASINS 6. WATER REUSE

20 DESALINATION IN BARCELONA Mediterranean Sea Des. Plant Barcelona

21 DESALINATION PLANT CHARACTERISTICS Production Annual production 60 hm 3 Daily nominal production m 3 Daily top production m 3 Technology Work pressure 70 bar Conversion 45% Elimination of salts effiency 99,7% Reverse Osmosis Electrical installed power kw Specific consumption Reverse Osmosis 2,7 kwh/m 3 Total 4 kwh/m 3

22 Location: Left margin of the Delta of the Llobregat river, near to the waste water treatment plant of Prat. Inauguration: 20th July 2009 Suministro: situación actual

23 WATER SEA CATCHMENT

24 PROCESS AND TREATMENT 2 racks OI 2nd. step remineralization 10 racks OI 1st. step 20 pressure filters 18 cardtrige filters Sluge treatment 20 open filters 10 floating tanks 6 water sea pumps Submarine pipeline 2 x ø1.800 mm

25 FACILITIES DISTRIBUTION

26 PUMPING WATER SEA PIPE

27 SUBMARINE PIPELINE

28 MAIN ROOM: REVERSE OSMOSIS

29 HIGH PRESSURE PUMPS

30 ENERGY RECOVERY

31 TREATMENT IMPROVEMENT IN SANT JOAN DESPÍ WTP

32 DETAILS SJD DWTP 120,000,000 m 3 of water treated yearly Concession of 5.3 m 3 /s Resources: Surface river water / Ground water 50% of the water consumed is from the Llobregat Characteristics of the surface water Minimum Average value Maximum Ammonium mg NH 3 /l TOC mg C/l Conductivity ms/cm ph ph units Hardness mg CaCO 3 /l

33 WATER QUALITY PROBLEMS Despite the modifications introduced into the treatment in recent years, there was no guaranteed fulfilment of the parametric value of THM s fixed by the legislation starting from (Directive 98/93) At that time, the treatment was not sufficient to achieve an organoleptic improvement to the water treated allowing the clients demands to be met.

34 WATER QUALITY PROBLEMS µg/ l EVOLUTION OF THE CONCENTRATION OF TRIHALOMETHANES OF THE WATER TREATED IN THE SANT JOAN DESPÍ DWTP ene-05 abr-05 jul-05 oct-05 ene-06 abr-06 jul-06 oct-06 ene-07 abr-07 jul-07 oct-07 ene-08 abr-08 jul-08 oct-08

35 PROJECT OBJECTIVES Compliance with Directive 98/93. THM s < 100 µg/l at points of consumption. Elimination of salts and dissolved organic compounds. Obtain organoleptic qualities of water from the Llobregat River similar to those from the Ter River. Have a treatment with future prospects. Continuity of operation of the existing DWTP. Maximize use of the existing resources.

36 SOLUTION ADOPTED Conventional pre-treatment with static decanting and sand filtration for 100% of the volume. Variable distribution of volumes in the post-treatment between the conventional line and a new membrane treatment line. The conventional post-treatment line is formed by an ozonization stage and a second carbon filtration stage (max. cap. of 5.3 m 3 /s). The new membrane treatment line is composed of an ultrafiltration pre-treatment and a second reverse osmosis stage (max. cap. of 2.4 m 3 /s).

37 DESCRIPTION OF THE NEW PLANT ULTRAFILTRATION STAGE 9 trains of 8 cassettes per train and 57 modules per cassette. Model ZW 1000 by Zenon Total membrane surface area: 228,757 m 2 Net design flow: 41.7 l/m 2 /h

38 DESCRIPTION OF THE NEW PLANT UV DISINFECTION 5 Lines of 530 l/s with high intensity and low pressure lamps, with units before and after the cartridge filters Dose of 380 J/m 2 radiation of 254 nm CARTRIDGE FILTERS 5 RO protection filters equipped with wound cartridges with selectivity of 5 µm

39 DESCRIPTION OF THE NEW PLANT REVERSE OSMOSIS FRAMES Treatment volume: 2.65 m 3 /s; volume produced: 2.39 m 3 /s Number of frames: 10 Conversion: 90% Configuration of frames: 1 step, 3 stages Pressure tubes per frame: 90 tubes of 7 membranes in 1st stage 40 tubes of 7 membranes in 2nd stage 28 tubes of 7 membranes in 3rd stage 1106 membranes per frame, brackish water type, size 8 x40, spiral winding, type Filmtec LE 440-I Supply pressure: between 8 and 16 kg/cm 2

40 DESCRIPTION OF THE NEW PLANT REVERSE OSMOSIS FRAMES

41 DESCRIPTION OF THE NEW PLANT DOSAGE OF REAGENTS Reagent Sulphuric acid Dispersant Sodium bisulphite Mission Adjustment of ph to avoid the precipitation of the calcium carbonate on membranes and control of the Aluminium. Control level of CO 2 in permeate of R.O. Avoid the precipitation of not very soluble salts on the membranes. Neutralize free oxidant to protect the membranes.

42 REAGENTS STORAGE DESCRIPTION OF THE NEW PLANT

43 DESCRIPTION OF THE NEW PLANT POST-TREATMENT Dosage of CO 2. Storage tank 50 m 3. Calcite beds: Downflow 24 filters of 6x4 m 2 Height of calcite between 2.5 and 3 m Speed of the water: m/h Contact time 11.4 min With aeration system to clean the calcite filter. Blend with ozonized water and filtered by granular activated carbon Disinfection with chlorine gas

44 POST-TREATMENT DESCRIPTION OF THE NEW PLANT

45 WORKS BUDGET 948, euros to draft the project and prior work. 44,758, euros to execute the works. 365, euros for operating tests. 3,162, euros for the electric connection. TOTAL: 49,235, euros (plus VAT)

46 OPERATING COST 23% For 17ºC, TDS of 1,150 mg/l and operation of 60% of the nominal capacity of the DWTP: 45% 10% 22% C Fixed costs: /m 3 Variable costs: /m 3 of which: Energía eléctrica Reposición mebranas Reactivos químicos Mantenimiento - Ultrafiltration: /m 3 - Reverse osmosis: /m 3 - Post-treatment: /m 3 Total cost: /m 3 The specific electric power consumption is 0.73 kwh/m 3

47 IMPROVEMENTS TO THE TREATED WATER CONDUCTIVITY (YEARS 2009/2012) Entry average conductivity Output average conductivity µs/cm ene- 09 mar- 09 may- 09 jul- 09 sep- 09 nov- 09 ene- 10 mar- 10 may- 10 jul- 10 sep- 10 nov- 10 ene- 11 mar- 11 may- 11 jul- 11 sep- 11 nov- 11 ene- 12 mar- 12 may- 12 jul- 12 sep- 12

48 IMPROVEMENTS TO THE TREATED WATER EVOLUTION THM S OUTPUT ETAP SJD (YEARS 2009/2012) 140,0 120,0 Average THM's Maximum THM's 100,0 µg/l 80,0 60,0 40,0 20,0 0,0 ene- 09 mar- 09 may- 09 jul- 09 sep- 09 nov- 09 ene- 10 mar- 10 may- 10 jul- 10 sep- 10 nov- 10 ene- 11 mar- 11 may- 11 jul- 11 sep- 11 nov- 11 ene- 12 mar- 12 may- 12 jul- 12

49 CONCLUSIONS In waters such as those from the Llobregat River, with a high content of organic precursors and bromides, it is very difficult with conventional treatments to achieve a concentration of THM s below that fixed by the Legislation starting from The salinity of the water from the Llobregat River is one of the main reasons why the organoleptic quality of the water was not satisfactory. According to the results of the pilot tests carried out, for the quality of the water to be treated in the Sant Joan Despí DWTP, the most appropriate membrane technology is reverse osmosis. The objectives to reduce THM s and improve the organoleptic quality of the water are obtained on blending, at 50%, water treated by reverse osmosis with water ozonized and filtered by granular activated carbon.

50 CONCLUSIONS With these types of waters, the pre-treatment of the water to be osmotized is crucial. In this case, and also in accordance with the results of the pilot tests carried out, ultrafiltration was chosen. For an average quality of the water and an operation of 60% of the nominal capacity of the Plant, the forecast operating costs are /m 3, of which are fixed costs and are variable costs. Under these conditions the specific electric power consumption is 0.73 kwh/m 3. Finally, with the first data from the commissioning of the Plant, an improvement in the quality of the water is observed, both on an organoleptic level, and as regards the reduction in conductivity and the level of THM s.