RDF OZONE DISINFECTION

Ing. Roberto Palazzolo – SRF ENERGY S.r.l.

VENICE 2008 - 17/11/2008

RDF typical Production routes

Drying & Sanification through Bio-stabilization of MSW

MSW shreddingbio-stabilization

Mechanical Sorting / Refining

RDF

InertMetals

High CalorificWaste

High quality RDF

MSW Mechanical

Sorting / Refining

Aerobic stabilization of Organic fraction

Stabilized Organic Fraction

Inert MetalsRawRDF

Sanification and Drying on RDF

Ozone Sanification

PhysicalDrying

Dry & Sanitized RDF

High CalorificWaste

High quality RDF

Table 1

Molecular weight 48g/mole

Density relative to air 1.66

Specific weight at 0°C and 760 mm HG 2.143 kg/mc

Formation heat 34.5 kcal/mole

Boiling point -112°C (dark blue liquid)

Freezing point -193°C (dark red solid)

Ozone Properties and Production

Low voltage electrode

High voltage electrode

Dielectric

Discharge sectionO2 O2 + O3

Corona discharge

Experimental Equipments used in the study

Ozone testing unit

Pilot contact reactor

Shredder / RDF

Different O2 (i.e. O3) flowrates

Contact time: 12 min

Technology validation in the pilot plant run..........

Different contact time

O2 flowrate: 3 lt/ min

1E+04

1E+05

1E+06

1E+07

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

A@1 lO2/min 2E+06 2,40E+05 2,67E+05 2,79E+05

B@ 2 l O2/min 2E+06 2,40E+05 2,67E+05 2,79E+05

Eff.% A 79,6 77 76

Eff.% B 89,8 89 88

blank 24 48 72

% R

em

oval E

ffic

ien

cy

CF

U/g

Oxygen Flowrate 3 lt/min

1,00E+06

1,00E+07

1,00E+08

1,00E+09

1,00E+10

CF

U/g

Blank 1,31E+09 9,80E+08 1,50E+09 1,60E+09 1,40E+09

A - contact time 12 min 1,80E+06 2,50E+06 2,00E+06 2,20E+06 4,90E+06

B - contact time 8 min 5,10E+06 5,90E+06 6,40E+06 5,80E+06 9,30E+06

C - contact time 4 min 1,00E+07 1,10E+07 4,80E+07 5,50E+07 1,00E+08

0 24 48 72 110

24 h 48 h 72 h

hours

Project Structure

40% 60%

One of the most important waste management company in Italy

Technology company and RDF-HQ trader

.......The First industrial scale Plant will be operated by SRF Energy in the new Magliano (CN) high quality RDF plant

Upgrading to High quality RDF production

Landfill expansion with biogas energy recovery

Existing Dry fraction production plant :UNIECO is a 20 years concessionaire

General Overview

Upgrading to High quality RDF production

Landfill expansion with biogas energy recovery

Existing Dry fraction production plant :UNIECO is a 20 years concessionaire

General Overview

Upgrading to High quality RDF production

Landfill expansion with biogas energy recovery

Existing Dry fraction production plant :UNIECO is a 20 years concessionaire

General Overview

Magliano Project : 40,000 ton/y High quality RDF

Magliano Project : 40,000 ton/y High quality RDF

Post-processing of the Dry fraction from an existing MBT plantThe system is designed in order to meet strict specification for:

Size : < 20 mm (15 mm optional) , size is controlled by the bottom sieve

Odors and Biostabilization: Ozone technology from PRAXAIR is applied

Moisture: Physical drying technology will be applied

Calorific Value: Plastic adding by weight controller has been foreseen

Chlorine: Daily lab test on automatic collected samples will be done

Magliano Project : 40,000 ton/y High quality RDF

Ozone Reactor

RDF Capacity: 7,5 ton/h

O3 production: 10 kg/h

Ozone – RDF screw contactor

Ozone Destroyer

Magliano Project : 40,000 ton/y High quality RDF

Cogeneration of Heat and ElectricityThe plant will run using the electrical and heat energy produced by the landfill gas generator. The electricity produced will be 450 kWe, together with Heat up to 650 kWth.

electricity

Heat

HeatThe remaining required heat to dry RDF will be produced by a biomass boiler

Heat

CO2 Emitted = ZERO