4. Results

#### 4.1 SBR wastewater treatment plant's GHG emissions

Eqs. (1)–(3) and default maximum CH4 producing capacity for domestic wastewater of 0.6 kg CH4/kg BOD and 0.25 kg CH4/kg COD and (Ti,j) values given in Table 6.5 of IPCC, "Suggested values for urbanization and degree of utilization of treatment discharge pathway or method (Ti,j) for each income group for selected countries," are used for the calculation of methane emissions from SBR WWTP [4].

### Sustainability Assessment of Wastewater Treatment Plants DOI: http://dx.doi.org/10.5772/intechopen.88338

Eqs. (4) and (5) and the values given in Table 1 are used for N2O emission calculations. Finally, indirect GHG emissions from the consumption of electricity are calculated by the use of emission factor of 0.91 tCO2e Mwh<sup>1</sup> [4]. Total emissions of full-scale SBR WWTP operated from 2012 to 2015 are given in Table 2 [17].
