This work concerned the application of anaerobic ponds for the primary treatment of urban wastewater in a Mediterranean climate. It was carried out on anaerobic ponds at large scale in Mèze (France). The anaerobic ponds constitute a good primary treatment with the removal of 55% of SS and 30% of BOD5, with a small surface area. The accumulation rate of sludge was only 0.017 m3/capita.year, due to their intensive anaerobic degradation. The anaerobic digestion reached equilibrium after one year of operation. The accumulation of sludge then showed seasonal variations with a substantial accumulation in winter and the digestion of the stock in summer. This change can be related to the influence of the temperature on methanogenesis. The production of biogas (83% CH4) was measured by gas collectors especially developed for this study and was also strongly dependent on temperature. The mass balance of carbon showed that 74% of the removed organic carbon was converted into CH4, 13% into dissolved inorganic carbon and 15% was stored in sludge. However, the anaerobic ponds presented a risk of creating odor nuisances with the emission of H2S.
Biogas production, sludge accumulation and mass balance of carbon in anaerobic ponds
B. Picot, J. Paing, J.P. Sambuco, R.H.R. Costa, A. Rambaud; Biogas production, sludge accumulation and mass balance of carbon in anaerobic ponds. Water Sci Technol 1 July 2003; 48 (2): 243–250. doi: https://doi.org/10.2166/wst.2003.0127
Download citation file:
Impact Factor 1.915
CiteScore 3.3 • Q2
First Decision in 30 days