5.D.1 - Domestic & Commercial Wastewater Handling

Last updated on 28 Jun 2018 13:43 (cf. Authors)

Short description

NFR-Code Name of Category Method AD EF Key Category 1
5.D.1 Domestic & Commercial Wastewater Handling T1 NS D no key category

In category 5.D.1, NMVOC emissions from domestic and commercial wastewater handling are reported.

The domestic section is covered by wastewaters of municipal (large sewage plants; ranging from <1000 up to >100.000 resident values) and domestic origin (small sewage plants; ranging from 4-50 resident values) as well as those from septic tanks (veeery small and not plants; ranging from 4 to about 10 resident values). 1 resident value equals 60g of BOD.
Industrial and commercial wastewaters are co-treated in municipal wwt-plants and thus covered in the domestic wastewater-section.

Method

Emissions reported under this category are calculated using the Tier 1 approach of the EMEP/EEA Guidebook 2016, where the emission factor (EF) is 15 mg/m³ wastewater (Part B, 5.D, chap. 3.2.2, Table 3-1, p. 7). This EF is multiplied with the total amount of wastewater (AD) treated in domestic and commercial wwt-plants, following the equation:

EM(NMVOC) = AD * EF (ibid., chap. 3.2.1).

Activity data

The used AD can be divided according to the activities listed for the domestic section (see above), since the German statistical agency has own data for each. All data sources are published on a three year basis with new data only for the respective year of the update. The availability of the data starts in 1991 with an exception for the following update, which was for 1995. Missing data are inter- or extrapolated

Municipal wastewater

Total volumes of treated municipal wastewater are taken from Statistisches Bundesamt, Fachserie 19, Reihe 2.1.2 .

Domestic wastewater

Data on volumes of domestic wastewater are derived by multiplying the average water consumption of the population in l/day (Statistisches Bundesamt, Fachserie 19 Reihe 2.1.1) with the population figures of people connected to domestic wwt-plants (Statistisches Bundesamt, Fachserie 19 Reihe 2.1.3). As an exception, data of the average water consumption are also available for 1987 and taken into accounting, with the effect that an interpolation of the time series for the year 1990 is possible.

Septic Tanks

Data for septic tanks are derived by using the same data sources and procedures as those described for domestic wastewater.

Emisson factors

See chapter "Method"

Uncertainties

The AD from Statistisches Bundesamt have an uncertainty of ±3% whereas the uncertainty for the EF is -5/+50%.

Recalculations

With activity data and emission factors remaining unrevised, no recalculations have been carried out compared to last year's submission.

Planned improvements

At the moment, no category-specific improvements are planned.

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