Sequencing Batch Reactor Technique for Municipal Sewage Treatment with Carbon Credits

Sequencing batch reactor is a developing technology in wastewater treatment for municipal sewage and industrial effluent. Aerobic process treatment generates significant amount of greenhouse gases mainly carbon dioxide (CO2) and nitrous oxide (N2O). Reduction of GHG emissions is a significant role in wastewater treatment. The greenhouse gas (GHG) emissions from wastewater treatment is a significant consideration for the treatment process evaluation. In the present work, the direct and indirect emissions from a single-stage sequencing batch (SBR) deammonification plant for nitrogen elimination from sludge liquor are calculated based on measurements and construction documentation. The results show that N2O is responsible for most CO2 emissions, followed by energy consumption and construction and machinery, but significant amounts can be saved in mainstream treatment. The present work reveals that there is a need for the development of less GHG emitting process configurations. In this paper, an attempt has been made to evaluate the GHGs for municipal wastewater (mainly CO2 and N2O) with SBR technology for carbon credits approach. The analysed results are compared in a detailed manner. Neutral and negative carbon footprint has been widely discussed and investigated.