BIODISCS (RBC) Rev. 3-0104

Plant configuration PRIMARY TREATMENTS RBC (BOD REMOVAL) FINAL SEDIMENTATION SEWAGE PURIFIED WATER SLUDGE (NITRIFICATION)

Post-Denitrification PRIMARY TREATMENTS AEROBIC RBC ANOXIC FINAL SEDIMENTATION SEWAGE METHANOL (BOD ADDITION) PURIFIED WATER SLUDGE Post-Denitrification Pre-Denitrification

The biological process WATER RBC media biological growth oxygen carbon dioxide final product sludge particles liquid film AIR

Side view cover shaft gearmotor media

Scheme and front view rotation RBC water media media support about 40% is submerged tank  shaft

Hollow shaft and radial structure

Hollow shaft under manufacturing process

made of polyethylene copolymer Plastic media truncated cones made of polyethylene copolymer

Plastic media density Standard density Medium density High density DISCS CLEARANCE 19 mm 16 mm 12 mm APPLICATION High load BOD5 500  600 mg/l Medium/low load BOD5 300  400 mg/l Nitrification

Critical situations for RBC Inlet overload  bacteria overgrowth  rotor weight increase No water in the tank  no buoyancy (Archimedian) force applied  rotor supports overstressed Energy black-out  unbalanced bacteria growth  unbalanced weight on the rotor

FEM (Finite Elements Method) analysis Sernagiotto design FEM (Finite Elements Method) analysis Oversized and reinforced shaft and radial structure  heavy duty design Qualification stress test

Qualification stress test Rotation: 3 times nominal speed Applied load: 2 times max operating load (100% clogging) Unbalanced rotation TARGET: over 5.000 hours test time equivalent to 100.000 hours regular operating time RESULT: POSITIVE, no defects

Technical data MEDIA (equivalent area) Population equivalent* *only BOD removal, medium density and municipal wastewater MODEL Overall diameter Rated power Number of sectors Standard density Medium density High density 2500-3500 D 4000 C 4000 4 2 5650 6910 8475 500-700 D 2300 C 2300 1.1 1150 1380 1725 800-1100 D 2300 M 2.2 3 2070 2587 3500-4500 D 3600 M 3600 6967 8360 10450 4500-5500 D 3600 L 5.5 9290 11150 13935 2000-3000 D 3600 C 4645 5575 4000-5500 D 4000 M 10365 12713 5500-7000 D 4000 L 11300 13820 16950 mm kW m2 P.E. U.M

Biodisc vs Activated sludge Sludge recirculation Operator attendance Space requested Final settling tank Energy consumption Modular configuration Environmental impact Bulking Capital costs NO LIMITED LIMITED (1/2 - 1/5) LOW (1/2 - 1/3) YES LOW HIGH YES LARGE HIGH NO LOW

Nitrification and denitrification

Plant assembling

Installation

Municipal application Customer SASSARI WWTP - Italy Model: (4) RBC D 3600 L-S (4) RBC D 3600 L-N2 (2) RBC D 3600 L-N Inlet Outlet Flow rate: 170 m3/h COD: 480 mg/l COD:  160 mg/l BOD5: 300 mg/l BOD5:  40 mg/l Suspended solids: 450 mgl Suspended solids:  80 mg/l

Municipal application Customer POSITANO WWTP (SA) - Italy Model: (5) RBC D 3600 STD Inlet Outlet Flow rate: 215 m3/h COD: 480 mg/l COD:  160 mg/l BOD5: 300 mg/l BOD5:  40 mg/l Suspended solids: 450 mgl Suspended solids:  80 mg/l

Municipal application Customer E.D.A.R. AGUILAR DE CAMPOO WWTP - Spain Model: (5) RBC D 4000 L-MD Inlet Outlet Flow rate: 135 m3/h BOD5: 177 mg/l BOD5:  25 mg/l Suspended solids: 143 mgl Suspended solids:  35 mg/l

Municipal application Customer COLLINSTOWN WWTP - Ireland Model: (2) RBC D 2300 M-N1 Inlet Outlet Flow rate: 9.4 m3/h BOD5: 226 mg/l BOD5:  25 mg/l Suspended solids: 333 mgl Suspended solids:  35 mg/l

Municipal application Customer LAS MATAS - LOS PENASCALES WWTP - Spain Model: (4) RBC D 3600 L-S Inlet Outlet Flow rate (average): 83 m3/h BOD5: 325 mg/l BOD5:  25 mg/l Suspended solids: 400 mgl Suspended solids:  35 mg/l

Municipal + industrial application Customer CONSORZIO VILLA BASILICA E PESCIA Veneri WWTP (PT) - Italy Model: (24) RBC D 3600 L-S (8) RBC D 3600 L-N Inlet Outlet Flow rate: 640 m3/h COD: 380 mg/l COD:  160 mg/l BOD5: 220 mg/l BOD5:  40 mg/l Suspended solids: 180 mgl Suspended solids:  40 mg/l

Industrial application (paper mill) Customer MOMO PAPER MILL (NO) - Italy Model: (4) RBC D 4000 L-S Inlet Outlet Flow rate: 65 m3/h COD: 500 mg/l COD:  160 mg/l BOD5: 275 mg/l BOD5:  40 mg/l Suspended solids: 65 mg/l Suspended solids:  80 mg/l

Industrial application (dairy) Customer 3 "C" Ghilarza (Sardinia)) - Italy Model: (2) RBC D 3600 L-N (4) RBC D 3600 L-S Inlet Outlet Flow rate: 20 m3/h COD: 8000 mg/l COD:  160 mg/l BOD5: 5000 mg/l BOD5:  40 mg/l Suspended solids: 2000 mgl Suspended solids:  80 mg/l

Industrial application (textile) Customer TINTORIA FINISSAGGIO 2000 Masserano (VC) - Italy Model: (1) RBC D 3600 L-S Inlet Outlet Flow rate: 60 m3/h COD: 420 mg/l COD:  160 mg/l BOD5: 200 mg/l BOD5:  40 mg/l Suspended solids: 66 mgl Suspended solids:  80 mg/l

RBC D 2300 “Package”