Abstract
Mexico City’s Metropolitan Area (ZMCM) is the third largest mega city in the world (INEGI 2010). Mexico City is also a signatory of the Global Cities Covenant on Climate and the Carbon Cities Climate Registry, suggesting that Mexico City and its ZMCM must consider national mitigation and adaptation strategies (SMADF 2008). A good opportunity is located in Wastewater Treatment Plants (WWTPs). Until 2009, only 9 % of the Wastewater produced at ZMCM was treated at (WWTPs) while the rest was discharged into surface waters (SEMARNAT 2009). A WWTP is an essential public service that simultaneously consumes a large amount of energy and produces a significant amount of by-product such as sewage sludge. In ZMCM, sludge is disposed in landfill, contributing to the green house gas emission of the area. However, there is an excellent conservation potential in WWTP which includes anaerobic digestion of sludge for biogas production as a renewable source of green energy. Additional optimization of different processes and services at WWTPs could be reached by implementing a pre-treatment of sludge and a two-stage anaerobic digestion, which could increase the total yield of bio-methane-hydrogen. Moreover, hydrogen has the highest energy content per unit weight of any known fuel (Das 2009). This is particularly interesting, as there are additional socio-economic benefits of using bio-hydrogen as a source of green energy. This chapter explores the benefits of implementing pretreatments and anaerobic digestion of sewage sludge in WWTP in ZMCM and highlights the environmental framework for wastewater treatment and green energy production.
Published Version
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