Methane emissions originating from the anaerobic waste stabilization ponds case study: Izmir wastewater treatment system

Waste stabilisation ponds for anaerobic wastewater treatment

“…While the linearity observed between TCOD removal and time demonstrates that the reactor has yet to reach steady state, the TCOD removal exceeds that observed during WSP studies operated over extended time periods and at higher mean operating temperatures (Ghazy et al, 2008;Picot et al, 2003). Toprak (1993) postulated that 25-40% TCOD removal could be achieved through physical settlement of suspended solids and was thus independent of biological degradation. In this study, however, only 38?6% of the TCOD fraction removed comprised particulate COD (TCOD 2 soluble COD fractionated ,1?2 mm).…”

“…This minimises sludge production and maximises local energy generation. Anaerobic waste stabilisation ponds are commonly used as the preliminary treatment phase in developing countries (Green et al, 1995a;Hodgson and Paspaliaris, 1996;Picot et al, 2003;Toprak, 1993) to treat wastewaters characterised by high organic strength (.600 mg chemical oxygen demand (COD)/l) and consistently high average temperatures (.20˚C) because of their simple construction and low parasitic energy demand (Table 1). As a passive process, the technology approaches a zero parasitic electrical energy demand, subsequently affording the opportunity to approach energy neutral wastewater treatment for individual small-scale works and without the demand for sludge imports.…”