1 / 8

Methane from SWDS

Methane from SWDS. New Norwegian calculating model. Per Svardal. 2004 revision of model from 1999. Many reasons. For reasons and results see www.sft.no/publikasjoner/luft/2079/2079.pdf Two of the reasons were: Complicated model, difficult, poor view of calculations (black box).

ciara-white
Download Presentation

Methane from SWDS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Methane from SWDS New Norwegian calculating model Per Svardal

  2. Metan fra avfallsdeponi 2004 revision of model from 1999 • Many reasons. For reasons and results see www.sft.no/publikasjoner/luft/2079/2079.pdf • Two of the reasons were: • Complicated model, difficult, poor view of calculations (black box). • Faulty mathematics.

  3. Metan fra avfallsdeponi Basic mathematics, first order reaction Rate of reaction equation, reactant transforming to methane: dDDOC =DDOC * k * e^-kt *dt Integrated equation for mass calculations, year t: DDOCdiss = DDOC * (e^-k(t-1) – e^-kt) (DDOC = dissimilable organic carbon)

  4. Metan fra avfallsdeponi Important theory • First order reaction • Amount of product formed (DDOCdiss) always proportional to the amount of reactant (DDOC) • When we know the full amount of DDOC it is of no concern to the calculations when the DDOC came into the SWDS: Every year can be regarded as the first year. • First order reaction equation the same as the compound interest equation, with negative interest rate.

  5. Metan fra avfallsdeponi Yearly steps in new calculating model • Calculate reactant deposited (DDOCd) • Add this to the reactant left as not dis-similated from last year (DDOCd+DDOCly) • Calculate DDOCdiss from 2. • Calculate the amount of methane formed from DDOCdiss. • Calculate DDOC not dissimilated for next year’s calculations (new DDOCly).

  6. Metan fra avfallsdeponi The ”motor” of the new model Two main equations: DDOCdiss = (DDOCd+DDOCly) * (1-e^-k) DDOCly = (DDOCd+DDOCly) * e^-k • (The presented workbook model is a little more complicated because it also handles the option of reaction start in the year of deposition)

  7. Metan fra avfallsdeponi The workbook • Sheet 3 • Parameters • Sheet 4 • Material input and final result • Sheets 5-7 • Calculations for the different materials • Sheet 8 • The accumulation of plastics

  8. Metan fra avfallsdeponi M D

More Related