CASE STUDY OF CDM VILLA DOMINICO LANDFILL GAS PROJECT -BUENOS AIRES - ARGENTINA WORKSHOP WORLD BANK APRIL 19 TH, 2007

Transcription

1 CASE STUDY OF CDM VILLA DOMINICO LANDFILL GAS PROJECT -BUENOS AIRES - ARGENTINA WORKSHOP WORLD BANK APRIL 19 TH, 2007 VAN DER WIEL Dates Population Served: Inhabitant Owner: CEAMSE (State) Operated by: Syusa (Private Contractor) Start of operations: October 1978 Closure: January 31, 2004 Yearly waste tonnage profile: t Types of waste disposed: Household and assimilable industrial waste. Separation / classification / composting: NO 1

2 Landfill Engineering Operation Average depth: 18 m. Area covered: 505 ha. Compaction details: 1 (t of waste/m 3 ) Frequency of waste cover: weekly Type of cover: 0.60 m to 1m Clay Location 2

3 Waste Type Waste composition 3

4 Waste composition Waste composition 4

5 Waste composition Landfill - Aerial Photos 5

6 Leachate water Treatment Plant CEAMSE - VAN DER WIEL STORTGAS BV Landfill Gas Engineering Project developer Van der Wiel Stortgas BV (Subsidiary of Van der Wiel Holding BV) Modelling The model used is the Rettenberger model. For this project a K-value of is used. The model uses K-values between and

7 CEAMSE - VAN DER WIEL STORTGAS BV Estimation of LFG of total landfill Landfill Gas Engineering Gasproduction, Collectable gas quantity Year 2005 Estimation of LFG production ( Nm³/hora) Gas quantity [m3/h] Gasproduction Collectable gas w ith 50%CH4 Collectable gas w ith 45%CH4 Collectable gas w ith 40%CH4 Year Landfill Gas Engineering Pumping trial During a period of five months a pumping trial was performed, using a small scale extraction plant, 4 normal wells, 5 combi wells and 2 horizontal drains. During this period, a detailed monitoring program was executed. 7

8 CEAMSE - VAN DER WIEL STORTGAS Landfill Gas Engineering Pumping Trial (Cases) HORIZONTAL DRAIN WELL HEAD COMBI WELL Various techniques available to extract biogas Vertical System 8

9 Mixed System Extraction Vertical and Horizontal LONGITUDINAL CUP Nucleo drenante Tuberia ranurada de Polipropileno HDPE Ø 160 Geom em brana de Polietileno de alta densidad de 500 μ Capa de Arcilla Tuberia ranurada HDPE Ø 110 M an ifold en A I Ø 4" c/ valvulas para tom as d e m u estra Capa de residuos TOP VIEW PLANT Geom em brana de Polietileno de alta densidad de 500 μ Nucleo drenante de Polipropileno M anifold en A I Ø 4" c/ valvulas para tom as de m uestra Tuberia ranurada HDPE Ø 160 Horizontal System in depth LONGITUDINAL CUP TRANSVERSAL CUP Geomembrana de Polietileno de alta Capa de Arcilla densidad de 500 μ Envoltura de Nucleo drenante de Polipropileno Tuberia ranurada HDPE Ø 160 Manifold en A I Ø 4" c/ valvulas esfericas para tomas de muestra Capa de residuos con arcilla cuerpo de residuos 9

10 Pumping Trial results Landfill Gas Engineering Technique Gas Extraction (m³/h) %CH 4 %CO 2 %O 2 Well Combi Well Horizontal Drain Engineering - Designed by Van der Wiel Stortgas B.V. Construction - Start Works April Built by Van der Wiel Argentina S.A. 10

11 Equipment - 3 Flares Nm³/h each - 3 Blowers Nm³ /h each - 3 Dewatering wells - 55 Horizontal drains - 55 Manifolds (measuring streets) Lineal Meters - 74 Ha Area Covered Average Working Conditions - Flow 1600 Nm³/h - Temperature 1160 C Scheme of the degassing installation 11

12 Recent photo plant Operation - Operator of plant: Van der Wiel Argentina S.A. - Started Operating: Profile of LFG extracted in time: 1600 m³/h - Total amount of waste currently being degassed: tn - Profile of CH4 extracted: 50 % - Profile of gas quality: % CH4: 50 % O2: 2 % CO2: 38 12

13 Present situation of location of drains Extraction Site Zoom 13

14 Comparison: Estimated LFG extracted with real extracted Year Estimation of LFG production (1000 Nm³/hour) Estimation of LFG extraction implemented part (1000 Nm³/hour) Real of LFG extraction (1000 Nm³/hour) Difference (+/ Nm³/hour) Difference (+/- %) % % Explanation for differences Main Issues Pumping trial area is not representative for whole landfill Landfill coverage differs from hectare to hectare Several cover layers inside the landfill disturb a proper extraction: layers vary from 5 cm up to 5 m of clay Leachate is enclosed in the landfill due to this layers and levels are very high Capacity of leachate treatment plant is not sufficient for a combined degassing system with leachate extraction Costs for leachate treatment are rising 14

15 Final Remarks Landfill gas is not accessible due to the leachate levels and will leak out of the landfill finding a different route Possible solutions for this environmental problem: treat leachate in a proper and economic way lower leachate levels to be able to access the gas 15