5.D.1 - Domestic & Commercial Wastewater Handling

Last updated on 20 Mar 2018 09:18 (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 plants) and domestic origin (small plants) as well as those from cesspools (veeery small and not plants). The commercial section is covered by industrial and commercial wastewaters, co-treated in municipal wwt-plants.

# 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:

(1)
$$EM(NMVOC) = AD * EF$$

(see above, chap. 3.2.1)

## Activity data

The used AD can be divided according to the activities listed for the domestic section, 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.

#### Cesspools

Data for cesspools 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.