摘要:
The invention concerns a method characterised in that it uses the stop/start sequences of the aeration system of the treatment basins, imposed by the treating process, to estimate the biomass respiration, the latter being measured during the non-aeration phases, according to the following steps: determining the dissolved oxygen concentration, the evolution of the amount of oxygen contained in the aeration tank, that is its decrease according to the purifying biomass respiration activity; determining the amount of oxygen coming out of the aeration tank, the amount of oxygen entering the tank during a non-aeration phase being considered as nil; determining, on the basis of the data collected during the above steps the purifying biomass respiratory capacity; determining the mass of suspended matters in the purifying biomass and computing, on the basis of the biomass respiratory capacity and the sludge concentration, the amount of oxygen consumed per mass unit of biological sludge and per time unit, that is, the purifying biomass specific respiratory activity.
摘要:
The invention concerns a method for controlling the aeration systems of biological tanks of a waste water treating plant characterised in that it consists in: (i) measuring the plant through flow (Qt),the recirculation flow (Qr) of the final settling tank mixed liquor towards the aeration tank, and (ii) measuring the dissolved oxygen concentration in the aeration tank so as to: a) work out, during an aeration interval, the mass balance of the oxygen input, consumed and evacuated with the effluent; b) work out, during a non-aeration interval, the mass balance of the oxygen consumed and evacuated with the effluent; c) determining the oxygen value consumed by the biomass from the two previously established mass balances; and d) determining, from the data resulting from a), b) and c) the value of the transfer coefficient alpha .kLa in the measuring conditions.
摘要:
The invention concerns a method characterised in that it consists in: measuring the oxidoreduction potential on each tank; respectively transmitting said measurements to a data processing system to analyse the oxidoreduction potential evolution and establishing a diagnosis of the aeration/biology couple to ensure the degradation reactions of the carbonaceous and nitrogenous pollution and determining, on the basis of said diagnosis, whether to start, to continue or to stop the aeration on the tanks, depending on the required degree of purification such that, in the first tanks, priority is given to the treatment of carbonaceous pollution with specific parameter representation of the oxidoreduction potential threshold values and, in the last tanks fine-tuning the treatment of the carbonaceous and nitrogenous pollution by managing the aeration consisting in establishing the oxidoreduction potential evolution curve, measured on these tanks, based on time and in computing the differential coefficient, and when the latter approaches zero, correlating the differential coefficient and the oxidoreduction potential value to determine whether to start, continue or stop aeration on said tanks.
摘要:
The invention concerns a method characterised in that it uses the stop/start sequences of the aeration system of the treatment basins, imposed by the treating process, to estimate the biomass respiration, the latter being measured during the non-aeration phases, according to the following steps: determining the dissolved oxygen concentration, the evolution of the amount of oxygen contained in the aeration tank, that is its decrease according to the purifying biomass respiration activity; determining the amount of oxygen coming out of the aeration tank, the amount of oxygen entering the tank during a non-aeration phase being considered as nil; determining, on the basis of the data collected during the above steps the purifying biomass respiratory capacity; determining the mass of suspended matters in the purifying biomass and computing, on the basis of the biomass respiratory capacity and the sludge concentration, the amount of oxygen consumed per mass unit of biological sludge and per time unit, that is, the purifying biomass specific respiratory activity.
摘要:
Procédé de régulation de l'aération d'un traitement biologique d'eaux usées mettant en oeuvre une étape d'élimination du carbone en aérobiose, une étape de nitrification en aérobiose et une étape de dénitrification en anoxie, procédé dans lequel on mesure en permanence le potentiel d'oxydoréduction dans un système de traitement, on établit la courbe d'évolution du potentiel d'oxydoréduction en fonction du temps et on en calcule la dérivée, caractérisé en ce que, lorsque la dérivée tend vers 0, on corrèle la dérivée et la valeur du potentiel d'oxydoréduction pour déterminer la mise en marche, la poursuite ou l'arrêt de l'aération.
摘要:
Procédé d'élimination de métaux dissous dans de l'eau, par oxydation du métal en une forme insoluble, précipitation et séparation de la forme insoluble, caractérisé en ce que la séparation de la forme insoluble est effectuée par filtration sur membrane et en ce qu'on recycle à l'étape d'oxydation au moins une partie de l'eau non filtrée par la membrane.