Anaerobic ponds are customarily designed as completely mixed reactors. However, evidence from experiments on full-scale facilities shows large deviations from ideal flow models, which in turn cause a reduced process performance. Thus, modified pilot scale anaerobic ponds receiving domestic sewage were developed and studied in parallel. A factorially designed experiment evaluated horizontal and vertical baffling, ponds fitted with cross-sectional plastic nets and a pond with a mixing pit. The hydrodynamic behaviour and process performance of these modified configurations were monitored for four flow rates (1.0, 1.2, 1.5 and 2.0 l/s). The results showed that baffling (vertical and horizontal) and the mixing pit configuration had the best hydrodynamic behaviours and removal efficiencies. Consequently, the development of high-rate anaerobic ponds, through improvements of hydrodynamic behaviour, seems feasible.
Improvement of mixing patterns in pilot-scale anaerobic ponds treating domestic sewage
M.R. Peña, D.D Mara, J.M. Piguet; Improvement of mixing patterns in pilot-scale anaerobic ponds treating domestic sewage. Water Sci Technol 1 July 2003; 48 (2): 235–242. doi: https://doi.org/10.2166/wst.2003.0126
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