Istituto di Ricerca Sulle Acque (IRSA) Water Research Institute Consiglio Nazionale delle Ricerche (CNR) National Research Council of Italy

Transcription

1 Istituto di Ricerca Sulle Acque (IRSA) Water Research Institute Consiglio Nazionale delle Ricerche (CNR) National Research Council of Italy M I LA N O ROMA BAR I Alfieri POLLICE, PhD < alfieri.pollice@cnr.it >

2 What we do BARI Dept. of water chemistry and technology MILANO Dept. of applied hydrobiology ROMA Head office, Central administration, Lab. of microbiology Water, wastewater, and sludge treatments Analytical methods Water resources management Environmental monitoring Ecotoxicology (surface and groundwater) Planning, services Water microbiology

3 Main figures (2013) Turnover: 2,8 M 2,5 M external projects 0,3 M govt. funding Human capital: about 170 people 65 scientists 25 technicians 10 administratives 70 contracts, fellowships, PhDs, etc.

4 IRSA-Bari (18,000 m2) View of the whole Institute

5 IRSA-Bari Main building

6 IRSA-Bari Laboratories (1000 m2) HPLC/MS GC/MS System for Thermal Diagnostic Studies

7 IRSA-Bari The pilot hall

8 IRSA-Bari Bench scale plants

9 Wastewater Treatments General aims of the activities in this area 1. Study and develop new processes for treating: Municipal wastewater, Industrial wastewater, Surface and groundwater, Wastewater treatment byproducts (sludge, odours, etc.). 2. Testing technologies for water cycle sustainability: Agricultural effluent reuse, Groundwater recharge, Industrial wastewater recycle, Operational optimization (sludge minimization, energy savings, etc.)

10 Puglia Available water and land use Rainfall ( ) Strongly rural Rural Moderately rural Urban Strongly urban Other 21% Puglia: mm/year 136 m3/capita per year absence of permanent rivers/natural lakes Irrigated 19% Land use Cultivated 79%

11 Wastewater treatment and effluent reuse Opportunities of reuse for irrigation in Puglia 1200 Water demand in Puglia Savings on primary resources = 10% External Resources (border regions) 3 Consumption (Mm /y) 1000 Regional Resources (groundwater) 800 Total Regional Water demand Mm /y Agricultural Civil Industrial Further advantages: Nutrient recovery Continuous supply Destination Municipal wastewater potentially available for reuse in irrigation: Total estimate 150 Mm3/year Tertiary wastewater treatment plants currently available 90 Mm3/year Piano di Tutela delle Acque della Regione Puglia (2007) / Regional Water Plan of Puglia (2007)

12 Treated wastewater reuse in irrigation From treatment for effluent disposal to water production for irrigation Conventional wastewater treatment (activated sludge) Raw waste Tertiary treatments Pretreatment Water body (river/lake/sea) Primary Activated Secondary sludge settling settling A) upgrade or B) polishing Standards for discharge Standards for reuse IRSA demo-scale activities: Surface filtration combined to biological processes A) Upgrade of activated sludge process (Membrane Bioreactors MBR) Raw wastewater Pretreatment Primary settling ultra FILTR DISINF Activated sludge Effluent for irrigation micro FILTR DISINF B) Polishing: Tertiary surface filtration processes ultra FILTR DISINF

13 IRSA activities on surface filtration for wastewater treatment and reuse Study of processes based on low pressure surface filtration for the production of water suitable for irrigation, study of microbiological quality and nutrient conservation. IRSA s main research projects on treated effluent reuse: POM ( ) - national, PON Aquatec ( ) - national, FP6 Reclaim Water ( ) EU, PRIN ( ) - national, PON Interra ( ) (also agro-industrial ww) - national, FP7 KBBE Water4Crops ( ) - EU-India, FP7 Inno-Demo Demoware ( ) - EU.

14 Case study 1 (PON Aquatec 2000/2006): Tertiary membrane filtration Pilot plant of 700 L/h Test field 2000 m2 Tertiary treatment (membrane) and storage tanks Cerignola WWTP 50,000 P.E. Membrane flux: 30 L/m2/h Membrane surface: 23,5 m2

15 Case study 2 (PON Interra/FP7 Water4Crops 2011/2016): IFAS-MBR and FDG for direct irrigation WWTP outlet CHLOR. 1) IFAS-MBR + UV Pre-screened wastewater FILTR. COAG.FLOC.-SED. 2) GDF + UV Secondary effluent SETTLERS 2 ACTIVATED SLUDGE 1 SETTLERS tes tf i el d WWTP influent Test field (3000 m2) Horticulture irrigated with treated effluents (including the WWTP outlet) and control (well water)

16 Treated wastewater reuse in irrigation: PILOT PLANT IFAS-MBR(*) with on-demand UV disinfection Storage tanks (30m3) m3/h UV on demand 15mm 15mm UV disinfection (*) Integrated Fixed film-activated Sludge Membrane BioReactor Test field

17 Treated wastewater reuse in irrigation: PILOT PLANT Gravity Disk Filter (GDF) with on-demand UV disinfection 25m3/h UV on demand IN = secondary effluent Test field n. 6 lamps (Hg vapor) GDF Cloth filtration (polyester), pores of 20µm Open channel UV-C disinfection

18 Case study 3 (PON Interra/FP7 Demoware 2011/2016): Recycle of agro-industrial wastewater for irrigation irrigation WWTP + tertiary treatment WW discharge mc/h Quality/quantity fluctuations Tertiary treatment Sand filtration Membrane filtration UV on-demand

19 Case study 4: Full scale tertiary treatment of municipal wastewater for direct reuse at Fasano (BR) - (Aquasoil s.r.l.) Tertiary treatment plant (8000 m3/d); 30 km water distribution network; Treated wastewater to 48 users (about 600 hectares).

20 Case study 5 (PRIN ): Fate of E. Coli in irrigation with treated wastewater TEST FIELD irrigated with treated wastewater (MBR effluent) + E. coli Soil columns irrigated with partially treated real wastewater Persistence of E. coli in surface soil and on grass? MBR Pilot scale MBR Q=15 L/h SRT=25 days; HRT=6 h Prod./Relax=3h/6min E. coli (and NO3) transfer through soil layers possibly to groundwter? P. et al. (2015) - Fate of Vergine the fecal indicator Escherichia coli in irrigation with partially treated wastewater. Water Research, 85,

21 Industrial and municipal wastewater treatment: NOVEL BIOPROCESS Self-forming Dynamic MBR Are synthetic membranes the best material for wastewater treatment? Are there less expensive materials that may provide effluent quality suitable for reuse? Can we use the cake (biological sludge layer) as a filtration tool? Nylon net (pores of µm) The cake (self-forming) is the actual filtering material

22 THANKS FOR YOUR ATTENTION