Haveaffaldsprojektet

Transkript

1 Haveaffaldsprojektet Haveaffaldsaftalen (materialer + analyser + ÅKV indsats): Alessio Boldrin betalt af 3R forskerskolen: give status + fortælle hvad der skal ske Jacob Kragh Andersen har afsluttet sit civilingeniøreksamensarbejde, som omhandlede luftemissioner fra haveaffaldskompostering: give kort status + fortælle hvad der skal ske, idet Jacob fortsætter som phd studerende betalt af DTU Jacob er fodboldinvalid for tiden og Alessio er til familiebryllup i Italien Foreslår at vi holder et længere møde herom i tidligt forår 2008 når vi er færdige med dataindsamlingen Her en kort orientering

2 Garden waste generation

3 Sampling solution Primary sample: all the waste incoming Use of mechanical machinery 5 fractions characterization: Wood Branches Fine material Stones Foreign objects 4-steps mass reduction scheme (at least 2 in situ) Industrial shredder + front loader Trailer shredder 1-D mass reduction Riffle splitter

4 Grab - sorting Fractions (0,5 10 tonnes)

5 1st step: shredder Subsample (0,1 2 tonnes)

6 2nd step: trailer shredder Subsample ( kilos)

7 1-D cross 2 Subsamples (3 5 kilos)

8 Cutter mill

9 Riffle splitter 2 replicates (5 10 grams)

10 Material fractions Branches Wood Stones Foreign items Small stuff Roots Material fraction composition (%) Grenaffald /06/06 27/09/06 8/11/ /01/07 14/03/ /04/ /05/ /08/2007 Date

11 Calorific value Average on incoming waste calorific value (MJ/kgDM) Jun-06 Jul-06 Aug-06 Sep-06 Oct-06 Nov-06 Dec-06 Jan-07 Feb-07 Mar-07 Apr-07 May-07 time

12 Chemical composition over time Average on incoming waste 16/6/ /9/2006 8/11/ /1/ /3/ /4/ /5/2007 TS (kg/ton) VS (% of TS) Ash (% of TS) S (% of TS) Cl (% of TS) F (% of TS) C (% of TS) H (% of TS) N (% of TS) O (% of TS) Calorific value (MJ/kgDM)

13 Compost composition ELEMENT UNIT 08/11/06 31/01/07 14/03/07 24/05/07 TS % VS % TS Ash % TS S Cl F C H N O % TS % TS % TS % TS % TS % TS % TS , % of the carbon is degraded on yearly average C:N Calorific value MJ/kg

14 K.S. test on macro-components components Industrial shredder

15 K.S. test on macro-components components Trailer shredder

16 K.S. test on macro-components components 1-D Mass reduction

17 Field location Location of the 8 windrows at the end of the measuring period Approximate windrow age [days] Concentration and flux measurements Quantification of Gaseous emissions from composting of garden waste

18 Materials & Methods gas concentrations Mapping of the concentrations in the void spaces of the compost: Gas probe measurements in transects T3 4m A3 T2 B3 A2 A1 T1 B1 B2 9m B3 B1 + B2 Quantification of Gaseous emissions from composting of garden waste

19 Results - gas concentration inside piles Average gas concentrations in the 9 points of the transects CO 2 29 Conc. of N2O and CO [ppm] Material age [days] Conc. of O2, CO2 and CH4 [%] >25% 10-25% <10% CH N2O CO CO2 CH4 O2 >25% 10-25% <10% O 2 CO N 2 O >15% 5-15% <5% >75ppm 25-75ppm <25ppm >200ppm ppm <100ppm Quantification of Gaseous emissions from composting of garden waste

20 Materials & Methods gas fluxes Gas flux measurements with Rambøll approach Convection controls the system chimney effect is assumed Outlet for concentration measurement Outlet for air speed measurement Quantification of Gaseous emissions from composting of garden waste

21 Materials & Methods gas fluxes Gas flux measurements with flux chamber approach manually operated fan J = dc / dt V / A INNOVA 20cm 31.2cm 3000 N2O Concentration of CH4, N2O and CO [ppm] CH4 CO CO2 y = x R 2 = y = x R 2 = y = x R 2 = y = x R 2 = Concentration of CO2 [ppm] Time [min] Quantification of Gaseous emissions from composting of garden waste

22 Results - spatial variation in the fluxes Flux chamber is placed 9 different places in the transversal direction Results verifies the chimney effect W1 T2 T1 T3 E1 Wind direction W3 W2 E2 E3 W E CO 2 [%] N 2 O [%] CH 4 [%] CO [%] Flux at T1 compared to total Flux Flux at T1+T2+T3 compared to total flux CO2 and CH4 flux [g/h*m2], N2O and CO flux [mg/h*m2] CO2 N2O CH4 CO 0 W3 W2 W1 T2 T1 T3 E1 E2 E3 Quantification of Gaseous emissions from composting of garden waste

23 Results - C and N mass balances 10 tonnes 0.16 tonnes 220 tonnes CO 2 (2.8%) CH 4 (0.4%) CO (0.01%) ~1940 tonnes? (96.8%) CO 2? 3184 tonnes C 2170 tonnes C lost 1015 tonnes C 0.23 tonnes 1.57 tonnes N 2 O(8.4%)?(91.6%) N 2? NH 3? NO? NH 4+? 60.1 tonnes N 1.8 tonnes N lost 58.3 tonnes N NO 3-? NO 2-? Quantification of Gaseous emissions from composting of garden waste

24 Planer 1 Afsluttede forsøg /undersøgelser der skal afrapporteres: - kemisk sammensætning af haveaffald (sidste prøve taget slut august) - laboratorieforsøg omkring gasafgivelse - laboratorieforsøg med udvaskning fra kompost og tørv Forsøg der skal gennemføres i efteråret 2007: - 2 gange totalmålinger på hele kompostpladsen - opfølgning på fluxmålinger (Jacob) - særlig indsats for CO2 og NH3 måling - supplerende prøvetagning af kompost og flis

25 Planer 2 Opstille masse- og energibalancer sammen med ÅKV i efteråret 2007 Afrapportere modellering af kompostudnyttelsen herunder værdien af sparet tørv Modellering af komposteringsprocessen i EASEWASTE (foråret 2008) Opstilling af scenarier og alternative scenarier Modellering Rapport (oktober 2008)