Le traitement des jus de digestion par le procédé de nitritation sharon® cas de la station Seine Grésillons du SIAAP

Abstract : The SHARON process is a biological effluent treatment system heavily loaded with ammonia nitrogen. It is based on the selection of microorganisms by sludge age, pH and temperature in order to set up a so-called partial nitrification, or nitrate shunt. Indeed, it is an aerobic nitritation directly followed by anaerobic denitrification. This innovative process is implemented in France on the Seine Grésillons wastewater plant (Yvelines, 1.2 million Equivalents.Habitants) operated by SIAAP. Placed in addition to the sludge treatment system, its role is to treat dehydration centers and digestion condensates of digested sludge from the site. Its interest is to avoid a too important supply of nitrogen on the water treatment line through the returns to the head; contributions that can represent 20% of the design load of the station. With the exception of bibliographic data, little technical and scientific knowledge is available on the operation of this process on an industrial scale. As part of the Mocopée research program, a fine follow-up of the process for more than two years has been carried out. The main objective of the project was to acquire a precise knowledge of the influence of the exploitation parameters on the composition of the microbial populations and thus on the treatment performances. After a literature review and a first measurement campaign in 2014, a set of recommendations were developed and implemented to ensure a proper functioning of the system. Following this preliminary step, successive modifications of the operating parameters (age of sludge, aeration, orthophosphate supply) were made according to an experimental protocol always identical: modification of an operating instruction followed by 3 weeks of stabilization of the reactor before implementation of a complete analytical campaign over 2 days (performances, kinetics, quantification of active nitrifying prokaryotic microorganisms - nitrating archaea or AOA, nitritating bacteria or AOB and nitrating bacteria or NOB). Three measurement campaigns were carried out in 2017. In general, the measured average NH4 concentrations appeared stable at entry (of the order of 875 mg N-NH4 / L) and variable at the outlet (from 30 to 215 mg N-NH4 / L). This variability in performance has been related to the operating modes of the process and the activity of the microorganisms. Thus, in addition to optimization of the operation (sizing of the boosters, feeding mode, reliability of continuous measurements) and the improvement of the analytical monitoring (filtration required, conservation of samples), the study made it possible to quantify precisely the performance of the process. Under appropriate conditions (T ° C above 40 ° C and sludge age of 3 to 4 days), the partial nitrification is in place and allows to obtain an N-NO2 / NOx concentration ratio greater than 95%. The results provided by this study are of prime importance for a reliable and efficient operation of the process on an industrial scale, making it possible to guarantee the respect of the statutory thresholds at the rejection of the plant.
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J.M. Perret, O. Garcia, C. Roose Amsaleg, A. Laverman, S. Pichon, et al.. Le traitement des jus de digestion par le procédé de nitritation sharon® cas de la station Seine Grésillons du SIAAP. Journées Information Eaux 2018, Oct 2018, Poitiers, France. 11 p. ⟨hal-01951172⟩

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