Assessment of performance wastewater treatment by infiltration-percolation: a case study

The recycling of wastewater is felt like a need, on the one hand to protect the receiving mediums and on the other hand, to be re-used for various uses (refill of the groundwater, irrigation….). To allow the development of the treatment of wastewater, the infiltration percolation can in this context, to represent an interesting alternative. This technique of purification combined with the Anaerobic Engine with Submerged Bacterial Bed (RALBI) developed at the point by laboratory BIOMARE of the Faculty of Science of El Jadida has for increasing the performances of treatment of the known as engine. The results of the complementary treatment by the infiltration-percolation made it possible to remove the effluent from engine RALBI from its suspended matter and to decrease its organic, nitrogen, and phosphor load and of its microbial flora. The averages of results of specific analyses are all in lower part of the thresholds of reference. Keywords: wastewater, treatment, infiltration-percolation, RALBI, bioreactor, El Jadida, Morocc

Carbon and nitrogen removal from a synthetic dairy effluent in a vertical-flow fixed bed bioreactor

International audienceIn this study, a synthetic dairy effluent (SDE) containing high levels of COD and nitrogen was treated in a fixed-bed bioreactor (FBBR) under the influence of the variations in residence time, aeration conditions and temperature. The tests performed continuously in a single step and the same reaction vessel allowed to define a 96 h cycle comprising two anoxic/aerobic phases of 48 h each. Sequential anoxic and aerobic conditions improved the removal of TKN and NH4+ by a factor of 2.5, whereas low temperature (10–15 °C) significantly decreased the nitrogen and COD removal rate. Overall, outcomes showed a successful growth of the biomass that reached (5.8 ± 0.31) × 106 CFU/mL, and high removal efficiency of COD (93.5 ± 8.1%), NO3− (99.2 ± 19%), TKN (87.5 ± 16.1%), and NH4+ (55.8 ± 8.3%), and hence complied with Moroccan standards. The FBBR system, therefore, can be applied successfully to remove COD and nitrogen from wastewater