UNFCCC – NAI GHG Inventory Software Waste Sector Practical Aspects and Exercises CGE Training...

UNFCCC – NAI GHG Inventory Software Waste Sector Practical Aspects and Exercises

CGE Training Materials

National Greenhouse Gas Inventories

Version 2, April 2012

Training Materials for National Greenhouse Gas Inventories

Consultative Group of Experts (CGE)

Content

a) Details on use of the UNFCCC-NAI Software to calculate and report GHG emissions

in the waste sector.

b) Practical exercises (to be solved by the participants after the presentation).

2Training Materials for National Greenhouse Gas Inventories


a) The decision trees in the IPCC good practice guidance (GPG 2000) are used to

choose a good practice method that suits national circumstances.

b) The UNFCCC-NAI Software contains, basically, the methods of lesser complexity that

countries can use to prepare their inventories.

c) However, in principle, the software can be used to report the estimated emissions

independently of the complexity of method used (Tier 2, 3, etc).

Background



Sector 6: Waste Source Categories and Subcategories Worksheets 6A. CH4 Emissions from Solid Waste Disposal 6-1s1 and 6-1sA to 6-1sC (4) 6B1. CH4 Emissions from Domestic and Commercial Wastewater and Sludge

6-2s1 to 6-2s4 (4)

6B2. CH4 Emissions From Industrial Wastewater and Sludge Handling 6-3s1 to 6-3s4 (4) 6B2. Indirect Nitrous Oxide emissions from Human Sewage 6-4s1 (1) (*) 6C. Waste Incineration 6-5s1 (1) (**) (#) Quantity of sheets

Changes in the worksheets with respect to the UNFCCC Software * To avoid double counting, a column was included in the UNFCCC–NAI Software for considering

(decrease) the amount of sewage N applied to soils as sewage sludge (Nsew sludge).

** The UNFCCC–NAI Software includes a worksheet to calculate the emissions of CO2, CH4 and N2O from waste incineration. Such as worksheet was not included in the IPCC software and the Revised 1996 IPCC Guidelines.

Waste Sector



SECTOR: WASTE (1) MAIN

CATEGORIES UNFCCC -

NAI SOFTWARE

Remarks

Tier 1: Worksheets

6A. CH4 Emissions from Solid Waste Disposal

6-1s1 and 6-1A to 6-1C

- The IPCC Guidelines do not classify methodological tiers for the Waste sector. Methodological tiers 1 and 2 are defined in the GPG 2000. The two methods can yield quite different estimates. Tier 1. Default Method - Based on the assumption that all potential CH4 is released in the year the waste is disposed. If the amount or composition of waste change rapidly over time this method will not provide an accurate trend. - If the activity data are available then there is not difficulty in using the Tier 1 Method and the software to estimate CH4 emissions, but it is recommended to use this method only as a last alternative until the IPCC 2006 Guidelines eventually be used. - Most of the factors required to apply this method can usually be obtained or estimated. Default values can also be applied. - It is required to know the population whose waste goes to SWDSs (total or urban), the MSW generation rate (country specific or default), and the fraction of MSW disposed of in SWDSs (country-specific or default). The parameter Lo (methane generation potential) is more difficult because it requires that the degradable organic component (DOC) be known, which is based on the composition of the waste.

CH4 Emissions from Solid Waste Disposal Sites (SWDSs)



SECTOR: WASTE (2) MAIN

CATEGORIES UNFCCC -

NAI SOFTWARE

Remarks

Tier 1: Worksheets


6-1s1 and 6-1A to 6-1C

Tier 1. Default Method. When applying this method keep in mind that: 1 - If a significant quantity of organic industrial solid waste is disposed of to SWDSs, care should be taken to determine the per capita solid waste generation rate and DOC. 2 - DOCf: The default value provided in the IPCC Guidelines is appropriate if lignin carbon is excluded. If lignin carbon is included a value in the range 0.5–0.6 should be used. 3 - Oxidation factor is assumed as zero except for well managed sites where 0.1 is reasonable. 4 - CO2 emissions are reported if combustion is used as a management practice at solid waste disposal sites (CO2 emissions from non-biogenic sources are included in the totals). It is necessary to know the composition of the material that is combusted. 5 - Sludge from wastewater handling if often disposed of to SWDSs. Emissions from this sludge should be included under this category. 6 - Add notes in the documentation box of the worksheet clarifying whether SWDSs were included and if any industrial sites were included.

CH4 Emissions from Solid Waste Disposal Sites (SWDSs) (cont.)



SECTOR: WASTE (3)

MAIN CATEGORIES

UNFCCC -NAI SOFTWARE

Tier 2 Methods

Remarks

Tier 1: Worksheets


First Order Decay (FOD) Method

Tier 2. - It is good practice to use the FOD method, if possible, because it more accurately reflects the emission trend. - Produces a time-dependent emission profile that better reflects the true pattern of the degradation process. - Requires data on current as well as historic waste quantities, composition and disposal practices. It is good practice to estimate this historical data if such data are unavailable. - The IPCC Guidelines do not provide default values or methods for the estimation of some key parameters. However, the main difficulties of this method are also related with Lo besides the historical behavior of some variables. Other parameters can be obtained from recommended interval. - With the UNFCCC–NAI software it is impossible to calculate the methane emissions, in this source category, using the FOD method (Tier 2). Suggestion: If that approach is used instead of the default method, then: 1) make the calculations outside of the software, 2) incorporate the results manually in the Sectoral Table and the Tables of Summary of the Inventory, 3) add a note to the documentation boxes of Tables 6-1s1 and 6-1sA to 6-1B clarifying the method used and results obtained. Provide detailed information in the NIR.

CH4 Emissions from Solid Waste Disposal Sites (SWDSs) (cont.)



SECTOR: WASTE (4)

MAIN CATEGORIES

UNFCCC – NAI

SOFTWARE

Remarks

Tier 1: Worksheets

6B1. CH4 Emissions from Domestic and Commercial Wastewater and Sludge

6-2s1 to 6-2s4 The IPCC Guidelines describe a single method for calculating CH4 emissions.

- If activity data are available then there is no difficulty in using the software to estimate emissions. - Emissions are a function of the amount of waste generated and an EF. Any CH4 that is recovered and flared or used for energy should be subtracted from total emissions. - Good practice is to use country-specific data expressed in terms of kg CH4/kg BOD removed. If country-specific data are not available, a default value can be used. It is good practice to use a default value of 0.6 kg CH4/kg BOD.

CH4 Emissions from Domestic and Commercial Wastewater and Sludge Handling



SECTOR: WASTE (4)

MAIN CATEGORIES

UNFCCC – NAI

SOFTWARE

Remarks

Tier 1: Worksheets

6B1. CH4 Emissions from Domestic and Commercial Wastewater and Sludge

6-2s1 to 6-2s4 The IPCC Guidelines describe a single method for calculating CH4 emissions.

Notes: 1 - The IPCC Guidelines provide only one default value of Bo that has to be applied to both COD and BOD. This is not consistent with the observed differences between BOD and COD in raw sewage. 2 - If default factors are being used, emissions from wastewater and sludge can be estimated together. 3 - CH4 emissions from sludge sent to landfills or used in agriculture are not included in this sector. 4 - Sludge incinerated as part of energy recovery should be included in the energy sector.

CH4 Emissions from Domestic and Commercial Wastewater and Sludge Handling (cont.)



Country A: Year: 2000. Worksheets 6-2s1 to 6-2s4

Data

• The National Statistics Office has provided the information included in the following table.

Population (1000 persons)

Degradable organic component

Fraction of DOC removed as sludge

Methane recovered

18 250.5 15 330 kg BOD/1000 persons/yr

0 5 000 tonne

Exercise 1:CH4 Emissions from Domestic and Commercial Wastewater and Sludge Handling (I)



Other Data:

• Use the following values for the calculation:

Wastewater handling system Fraction of wastewater treated by the handling system

Methane conversion factor for the handling system

Collected(sewered to plant)

Lagoons

(anaerobic deep)0.02 0.8

Not specified 0.05 0.75

Uncollected

(treated on site)

Latrines and septic systems 0.3 0.15

With regular sediment removal

Exercise 1:CH4 Emissions from Domestic and Commercial Wastewater and Sludge Handling (II)



Tasks

Using the UNFCCC-NAI Software:

• Calculate net CH4 emissions

• Verify the emissions report in the Sectoral and Summary Tables

• Fill in Table 8A (Overview Table) for the self evaluation of quality and completeness

• Print the worksheet used, the Sectoral Summary Table and the Overview Table (8A).

Exercise 1:CH4 Emissions from Domestic and Commercial Wastewater and Sludge Handling (III)



Steps

• Open the software and select in the waste sector Worksheet 6-2s1 Estimation of Organic

Wastewater and Sludge.

• Specify in column A that the estimation is for “all country”.

• Enter population data in Column B, and DOC in column C.

• Specify the Fraction of DOC removed as sludge. The software calculates the Total

Domestic/Commercial Organic Wastewater.

Exercise 1:CH4 Emissions from Domestic and Commercial Wastewater and Sludge Handling (IV)



Steps

• Go to Worksheet 6-2s2 and specify in column A the Wastewater Handling Systems used in the country.

• Enter in column B the Fraction of Wastewater Treated by the Handling Systems and in C the Methane Conversion Factor. Enter in E the Maximum Methane Producing Capacity (0.6 kg CH4/kg BOD). The software calculates the EF.

• Go to Worksheet 6-2s4 and enter in D the Methane Recovered. The software calculates Net CH4 emissions.

Exercise 1:CH4 Emissions from Domestic and Commercial Wastewater and Sludge Handling (IV)



ESTIMATION OF ORGANIC WASTEWATER



ESTIMATION OF EMISSION FACTOR



CH4 EMISSIONS FROM DOMESTIC AND COMMERCIAL

WASTEWATER HANDLING



CH4 EMISSIONS FROM DOMESTIC AND COMMERCIAL WASTEWATER HANDLING IN THE SECTORAL

REPORT TABLE



CH4 EMISSIONS FROM DOMESTIC AND COMMERCIAL WASTEWATER HANDLING IN THE SUMMARY

REPORT TABLE



SECTOR: WASTE (5)

UNFCCC - NAI SOFTWARE

MAIN CATEGORIES

Tier 1: Worksheets

Remarks

6B2. CH4 Emissions From Industrial Wastewater and Sludge Handling

6-3s1 to 6-3s4 - The method is similar to the one used for domestic wastewater. - The development of EF and AD is more complex because there are many types of wastewater and many different industries.

- If activity data are available then there is no difficulty in using the software to estimate emissions. If no national data are available: - Estimate CH4 for all industries using expert judgment or default values for COD data. Suggestion:

1. If possible, collect or estimate COD data for the three or four most important industry types with treatment in site (e.g. food and beverages, pulp and paper, textiles, petrochemicals, etc.).

2. Calculate CH4 emissions from industrial wastewater based on COD from most important industries.

CH4 Emissions from Industrial Wastewater and Sludge Handling



SECTOR: WASTE (5) UNFCCC - NAI

SOFTWARE MAIN

CATEGORIES Tier 1:

Worksheets

Remarks

6B2. CH4 Emissions From Industrial Wastewater and Sludge Handling

6-3s1 to 6-3s4 - The method is similar to the one used for domestic wastewater. - The development of EF and AD is more complex because there are many types of wastewater and many different industries.

Notes: - Typical COD values for some industries provided in the IPCC Guidelines were updated in GPG2000 (Table 5.4). The units for wastewater generation and COD in this Table are different (but equivalent) to those of the workbook and the software. - The EF calculation in worksheets 6-3s2 and 6-3s3 should be made for specific industrial wastewater sources. To do this it would be necessary to copy and insert these worksheets several times and to assure the necessary links. Another option is to make an aggregated analysis for each type of Wastewater Handling System used for industry type (or for all the industries). - Possibility of double counting emissions due to some industrial wastewater being released into municipal sewerage systems and accounted under Domestic and Commercial Wastewater. - Possible overestimation of CH4 emissions as a result of the incineration of sludge.

CH4 Emissions from Industrial Wastewater and Sludge Handling (cont.)



Indirect N2O Emissions from Human Sewage

SECTOR: WASTE (6)

MAIN CATEGORIES

UNFCCC - NAI

SOFTWARE

Remarks

Tier 1: Worksheets

6B2. Indirect Nitrous Oxide emissions from Human Sewage

6-4s1 Default Method - Method based on per capita protein consumption. This method for estimating N2O emissions from N in sewage that is discharged into rivers and/or estuaries is presented in GPG 2000 chapter 4 Agriculture, although these emissions are reported under the waste sector (Domestic and Commercial Wastewater). - Requires knowing the average annual Per Capita Protein consumption in the country, the Population in the Country, the Fraction of N in Protein and the EF (EF6). Country-specific and default data may be used. Note: Country-specific values of EF6 must be used with great caution because of the complexity of this emission pathway. - The software can be used directly for the estimation. - To avoid double counting, a column for considering (decrease) the amount of sewage N applied to soils as sewage sludge (Nsew sludge) was included in the software.





SECTOR: WASTE (7)

MAIN CATEGORIES


Remarks

Tier 1: Worksheets

6C. Waste Incineration

- This source category was not included in the Workbook and the IPCC Software, therefore there are no Worksheets. - The Reference section of the IPCC Guidelines Manual describes a general approach and provides references to methods available for some of the gases. - The UNFCCC–NAI Software includes a worksheet to calculate the emissions of CO2, CH4 and N2O from waste incineration. The IPCC Guidelines do not include worksheets for this source category.

Emissions from this source category can be estimated using the UNFCCC–NAI software. - GPG2000 provides approaches to determine the emissions of CO2 and N2O (emissions of CH4 are not likely to be significant). - The method requires knowing waste incinerated, EF and the burn out efficiency of combustion. Country-specific and default values may be used. - The most accurate estimates can be developed by determining the emissions for each type of waste (e.g. municipal solid waste, sewage sludge, clinical waste and hazardous waste). Notes: 1 - Only CO2 emissions resulting from the incineration of carbon in waste of fossil origin (e.g. plastics, certain textiles, rubber, liquid solvents and waste oil) should be included. 2 - CO2 emissions from combustion used as a management practice at SWDSs are to be included under Solid Waste Disposal. 3 - Emissions without energy recovery have to be reported in the waste sector, whereas emissions with energy recovery should be reported in the energy sector.

Emissions from Waste Incineration



Emissions from Waste Incineration and Open Burning of Waste

SECTOR: WASTE (7)

MAIN CATEGORIES


Remarks

Tier 1: Worksheets

6C. Waste Incineration by Open Burning of waste

- There is methodology to calculate the emissions of CO2, CH4 and N2O from waste incineration. The IPCC Guidelines do not include worksheets for this source category.

Emissions from this source category can be estimated using independent methods including the use as an advanced Tier of IPCC 2006 guidelines:

Page 5-16 contains suggestions for activity data . Pages 5-20 and 5-22 provide EF for CH4 and N2O.

For CO2 the oxidation factor needs to be calculated locally but is below 100%.



NEW WORSHEET 6-5S1 INCLUDED IN THE UNFCCC–NAI SOFTWARE FOR CALCULATING EMISSIONS FROM WASTE INCINERATION



Country A: Year: 2000.

Data

The Environment Ministry provided data on solid waste disposal in the country during the

year 2000. It also provided results from studies carried out on solid waste characterization.

Determine the CH4 emissions from the disposition of solid waste on land using the UNFCCC-

NAI Software.

Verify the results obtained in the Sectoral Report Table and the Summary Tables of the

Inventory.

Exercise for self-evaluation 1: CH4 from Solid Waste Disposal on Land (I)



COUNTRY A: YEAR 2000. DATA RELATED WITH SOLID WASTES DISPOSAL

Urban population of the country 8 666 744 persons

MSW generation rate 0.68 kg/capita/day

Fraction of MSW disposed to SWDSs 1

Proportion of waste for each type of SWDSs

• Managed 0.7

• Unmanaged-shallow 0.3

Fraction of DOC in MSW 0.18

Recovered methane per year (Gg) 0

Exercise for self-evaluation 1: CH4 from Solid Waste Disposal on Land (II)



RESULTS

CH4 emissions from solid waste disposal on land 113.73 Gg CH4

Exercise for self-evaluation 1: CH4 from Solid Waste Disposal on Land (III)



Thank you



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