Società per Azioni BUSAN KOREA New horizons in water reuse scope and application world wide workshop Tuesday 18 september 2012 VALORISATION OF HISTORICAL HERITAGE AND RESTORATION OF BIODIVERSITY IN THE REGION OF MILAN-ITALY Milan Nosedo, Italy www.depuratorenosedo.eu Roberto Mazzini-Milanodepur spa –President [email protected] BUSAN KOREA World water congress 1 16-21 September 2012 BUSAN KOREA World water congress 2 16-21 September 2012 EUROPE-ITALY-MILAN MILAN Società per Azioni BUSAN KOREA World water congress 16-21 MILAN 3 September 2012 Italy and Milan • The city of Milan is located in the Lombardy region in northern Italy, one of the wealthiest areas in the whole Italian territory in terms of waters: to the north lies the important crescent-shaped Alps system, with the Maggiore and Como lakes, and the city is situated among the three main Italian rivers, namely the Ticino, Adda, and Po rivers . Before the construction of the wastewater treatment and recycling plants, urban wastewater was collected by a grid of small streams and canals, particularly the Northern and Southern Lambro River and discharged by the Po River to the Adriatic Sea. BUSAN KOREA World water congress 16-21 4 September 2012 Milan and the main Italian rivers Società per Azioni BUSAN KOREA World water congress 16-21 5 September 2012 Southern MILAN-LOCATION OF WWTP Società per Azioni NORD NOSEDO 1.2 M E A PESCHIERA B, 0.3 M E A MILAN San Rocco 1 M E A BUSAN KOREA World water congress 16-21 6 September 2012 Società per Azioni •Milan Nosedo, Italy •WWTP – BOT Contract •Agricultural Reuse of treated wastewater BUSAN KOREA World water congress 7 16-21 September 2012 NOSEDO : A WWTP located in an area with historical and environmental constraints Società per Azioni • Total area involved in the project: 40 hectares (Vettabia Park +WWTP) WWTP surface area: 16 hectares Vettabia Park ( in Southern Milan, one km from the Chiaravalle Abbey) : to create an environment around the treatment plant, and to promote biodiversity The project has been approved by Ministry of BUSAN KOREA World water congress 16-21 8 Environmental Heritage(per I BeniSeptember e 2012 le attività culturali) Nosedo & San Rocco flow sheet Nosedo WWTRP 5 to 15 m3/s Disinfection Peracetic acid Reuse Pretreatment Activated sludge Sand filtration Degritting, sand Nitrification & vith P removal and oil removal denitrification UV disinfection Low dose River Sludge treatment Aerobic stabilisation UV disinfection Dewatering High dose Reuse Thermal drying Sludge valorisation San Rocco WWTRP Odour treatment 4 to 12 m3/s BUSAN KOREA World water congress 16-21 9 September 2012 Treated water quality: contractual, legal and actual values Società per Azioni Legal limits Legal for Average Contractual Parameter U.M. Limits Leg. value since value irrigation Dec. 152/06 Min. Dec. 2004 185/2003 7.5 pH 5.5 – 9.5 5.5 – 9.5 6 – 9.5 None Sed. solids ml/l None None None 3 Suspended solids SS mg/l 10 35 10 15 COD mg/l 100 125 100 < 5 BOD mg/l 10 25 20 7 Total N mg/l 10 10 15 Total P mg/l 1 1 2 < 1 CFU/100 Escherichia Coli 10 5,000 10 < 10 ml BUSAN KOREA World water congress10 16-21 10 September 2012 KEY FIGURES Treatment capacity of the two largest WWTRP: Nosedo 430,000 to 1,300,000 m3/d; San Rocco 350,000 to 1,040,000 m3/d Total annual volume of treated wastewater of: Nosedo 241±16 Mm3/yr, from which 86±6 Mm3/yr used for irrigation of rice, corn, grass and Horticulture Maximum flow rate of 4 m3/s supplied by each of the two facilities to four irrigation canals Capital cost: 150 M€ (Nosedo), 132.6 M€ (San Rocco), BOT and DBO contracts Average Operation and maintenance costs of 0.120 €/m3, data for 2011 Stringent standards for unrestricted irrigation of <10 E.coli/100 mL Recognised environmental benefits and added value for agriculture BUSAN KOREA World water congress 16-21 11 September 2012 Evolution of total annual volumes of treated waste water and supplied recycled water in Milan by the two recycling facilities of Nosedo and san Rocco WWTRP Volume, Mm3 2005 2006 2007 2008 2009 2010 2011 Treated water 143.8 143.4 137.9 136.3 148.6 157.4 149.0 Nosedo Supplied 82.9 76.5 73.2 70.0 75.4 74.7 79.0 to reuse Treated water 89.7 92.3 87.1 93.8 108.3 107.1 72.8 During San Rocco 30.5 30.6 39.1 40.9 37.8 27.9 37.5 reuse periods Supplied 9.0 14.8 9.8 7.4 11.7 8.4 11.4 to reuse BUSAN KOREA World water congress 16-21 12 September 2012 FROM DISINFECTION TO IRRIGATION Società per Azioni BUSAN KOREA World water congress 16-21 13 September 2012 Società per Azioni VETTABBIA – farmers consortium • 84 member farmers; 90 farms • Irrigated Area: 3700 ha (Now), 4400 ha (In the past) • WATER USED – average values: • 700 l/s max for the irrigation of 1700 ha ( Vettabbia high) • 3000 l/s for the remaining 2000 ha • Farmers pay 1827,42 euros/year to Regione Lombardia, through Vettabbia Consortium, concession rights to take water from the Vettabbia stream BUSAN KOREA World water congress 16-21 14 September 2012 Farming – crops Società per Azioni • 45% corn • 15% rice • 40% grass and grain BUSAN KOREA World water congress 16-21 15 September 2012 Irrigation methods Società per Azioni Sprinkler Irrigation Corn irrigation with pressur jet BUSAN KOREA World water congress 16-21 16 September 2012 Benefits for the farmer Società per Azioni • Good water quality for irrigation (E. Coli<10 CFU/100 ml) • Cheaper water ( Costorium Vettabia pay 1827,42 euros/year to the Regione Lombardia) • Ensure a reliable resource available all year • Soil amelioration (No waterproof effect due to the sedimentation of matter coming from previous wastewater) • The nourishing value of the nutrient enriched effluent improves the yields of farmers • Increased crop yields increase the farmer revenues; is difficult to have a figures per hectar • reduction need to add artificial fertilizers BUSAN KOREA World water congress 16-21 17 September 2012 KEYS TO SUCCESS – Existence of a very old complex network of irrigation canals and agricultural activity in proximity of the city (fertile Po Valley) – Delivery of high quality recycled water to farmers almost free of charge with an effective control of water allocation by two farmer associations – Financial equilibrium, high treatment efficiency and reliability of operation, ensured by high qualified staff and public-private partnership – Demonstrated environmental benefits for restoration of surface water, groundwater and biodiversity – Valorisation of historical heritage and peri-urban agriculture (“zero-kilometre products”) – Public education programs and collaborations with non- profit organisations BUSAN KOREA World water congress 16-21 18 September 2012 The Vettabbia stream flows into the monks valleySocietà per Azioni From Nosedo wwtp to Chiaravalle and Viboldone Abbays north Nosedo wwtp Chiaraval le abbey Viboldone abbey BUSAN KOREA World water congress 16-21 19 September 2012 Vettabbia stream from wwtp to chiaravalle abbey wwtp abbey BUSAN KOREA World water congress 16-21 20 September 2012 Vettabbia stream from Chiaravalle abbey to Viboldone abbey direction corn corn BUSAN KOREA World water congress 16-21 Flow regulation 21 September 2012 to fields Vettabbia flow is divided in four secondary streams 4 3 2 1 BUSAN KOREA World water congress 16-21 22 September 2012 corn July 2012 April 2012 VETTABBIA STREAM NEAR VIBOLDONE ABBEY IN corn APRIL and JULY 2012 corn BUSAN KOREA World water congress 16-21 23 September 2012 VIBOLDONE ABBEY and the arrival of vettabbia stream BUSAN KOREA World water congress 16-21 24 September 2012 The two fantastic Abbey and fhe historical role of the monks BUSAN KOREA World water congress 16-21 25 September 2012 Cistercian monks first environmental engineers • Agriculture and water reuse have a long history in the region of Milan. In the Ancient Roman era, an early land reclamation process was initiated by means of large marshes to protect the fertile territories in the so-called low plains from floods . Later, in the Middle Age, the various monasteries, as customary throughout Europe, particularly Cistercian monks, started to build an irrigation network for the lowlands. The Cistercian community from Chiaravalle (Figure 2) constructed the first elements of the current irrigation ditch network BUSAN KOREA World water congress 16-21 26 September 2012 Roberto Mazzini Thanks you for the kind attention [email protected] www.depuratorenosedo.eu BUSAN KOREA World water congress 16-21 27 September 2012 .