FR2996546A1 - Regulating the performances of a station of biological and/or physicochemical treatment of waste water, comprises adjusting e.g. cycles of ventilation of a sewage treatment plant according to information obtained from external parameters - Google Patents

Abstract

The method comprises: regulating external parameters at a treatment station (E) provided by transmitters and/or receivers, which communicate with a control unit (C) of the station; and adjusting, by the control unit, cycles of ventilation of a sewage treatment plant and/or proportioning of treatment reagents and/or the operation of consuming energy devices of the station, according to information obtained from the external parameters. The external parameters comprise analyses and short-term forecasts of a hydraulic load and pollution to be treated by the station. The method comprises: regulating external parameters at a treatment station (E) provided by transmitters and/or receivers, which communicate with a control unit (C) of the station; and adjusting, by the control unit, cycles of ventilation of a sewage treatment plant and/or proportioning of treatment reagents and/or the operation of consuming energy devices of the station, according to information obtained from the external parameters. The external parameters comprise: analyses and short-term forecasts of a hydraulic load and pollution to be treated by the station; a state of an environment receiver continuously analyzed by a sensor array situated near a discharge of the treated water; conditions of the energy market to adapt the flexibility of consumption of the plant to the availability and the cost of kWh; and weather forecasting including air temperature, precipitations, speed and direction of the wind, and periods of sunshine. The regulation step comprises: directly and continuously measuring physicochemical parameters such as pH, temperature, conductivity, dissolved oxygen, turbidity, nitrates and total organic carbon; detecting in line of priority substances; and measuring pollution integrated in time by passive samplers. The regulation step takes into account nitrogenized and/or cogitated parameters, and establishes a circadian cycle of oxygen level and/or oxygen saturation and/or pH by sensors placed in a receiving medium. The control of the equipment of the sewage treatment plant is adapted when one of the following events occurs: overrun of the maximum permissible amplitude of a circadian cycle of oxygen level and/or oxygen saturation and/or pH; and crossing a threshold (minimal or maximum) of the oxygen level and/or the oxygen saturation and/or the pH, or overrun of a slope of the amplitudes of circadian cycle on consecutive days, where the progressive drift of the amplitude of the circadian cycle is a sign of an increased sensitivity of the medium. The regulation step further comprises: measuring the oxygen level, the pH, contents of nutrients, flow rate, temperature, and/or luminosity, provided by transmitters installed in the receiving medium downstream from the station of treatment; and measuring, in a receiving natural environment, the physicochemical parameters representative of its health status. The method further comprises: maintaining the discharge below a permanent minimal discharge instruction for the periods of increased sensitivity of the receiving medium and ensuring the minimal instruction in normal periods for the permanent minimal discharge instruction; and modulating the level of discharge around the minimal instruction, according to the normal periods, sensitive and insensitive for an expressed minimal instruction in annual or periodic medium. The regulation step takes into account market conditions and adapts energy operating range of the energy consuming devices based on their flexibility, so that a minimum number of energy consuming devices is used during periods with constraints. The economic output of the station is improved by: treating a buffer water tank; increasing the volume of water treated during hours when energy is cheaper; reducing the volume during hours when the energy is more expensive, where the total volume processed for given period of time is equal to that of the desired period of time; taking into account the weather forecast to increase the volume of treated water for periods of normal or low rainfall; and maintaining the volume of treated water equal to the optimal range during periods of heavy rain. The regulation step takes into account the weather parameters to ensure a regulation of reagents for deodorization and treatment of smoke according to the speed and the direction of the wind, while remaining in emission standards, to further protect the surrounding areas, using the phenomena of dispersion and fallen treated gases. An independent claim is included for a station of biological and/or physicochemical treatment of waste water.

Description

METHOD FOR CONTROLLING THE PERFORMANCE OF A WASTEWATER TREATMENT STATION, AND TREATMENT STATION USING THE SAME

The present invention relates to the real-time regulation of the purification performance of a biological treatment plant and / or physico-chemical waste water. Currently, the minimum treatment performance of a wastewater treatment plant, or wastewater, is set and adjusted by the operator to ensure that the treated water complies with pre-established standards, in a strict contractual area and regulatory. The operating elements of the purification plant (aeration equipment, reagent dosing equipment, etc.), which have a direct impact on the level of purification performance, are controlled by measurements of various internal parameters: these are values of input parameters (example: raw water inflow), intermediate treatment values (eg oxygen or redox content in biological basins), values at the end of treatment (example: phosphate content of water) treated water).

In addition, the minimum treatment performance required in the contractual and regulatory field is often expressed as an annual average, with minimum and maximum threshold values. This allows, while remaining within the scope of the standard, to vary the qualities of treated water at certain times of the year while ensuring the performance required for the year. For example, standards for the release of nitrogen compounds (global nitrogen, nitrates, etc.) and phosphorus compounds (total phosphorus, phosphates, etc.), which are responsible for aggravating eutrophication phenomena that are harmful to the environment, can be considered. natural receptor for treated water: we speak of dystrophy of the watercourse constituting the natural receiving medium. However, the sensitivity of the natural environment to eutrophication varies over time, depending for example on the flow of the river (if the receiving environment is a river), the temperature, the seasons (phenomena increased in summer), the spill. upstream of nutrients ... A constant rejection level on the nitrogen and phosphorus parameters thus amounts to not differentiating the periods of the year.

In addition, the wastewater treatment plants consume energy, especially in electrical form, and consumption peaks often correspond to periods of high activity where energy is expensive or unavailable. Methods make it possible to limit consumption during peak hours, such as, for example, regulated aeration on ORP, which makes it possible to spread the operation of the boosters; but these operating strategies are limited and do not take into account the constraints of Smart Grid energy networks that impose periods of partial or total erasure.

None of the current solutions are adapted to the real-time modification of the consumption profile or the flexibility of the main consuming devices of a water treatment plant (blowers, sludge treatment equipment, tertiary treatment, odor treatment ...).

Finally, the variation in climatic conditions has a significant impact on the operating parameters of a water treatment plant. The object of the invention is, above all, to provide a method of regulating a wastewater treatment plant, or "purification plant", which better than before meets the various requirements of protection of the natural environment and / or energy consumption. According to the invention, the method for real-time regulation of the performance of a biological and / or physico-chemical treatment plant for wastewater is characterized in that: the regulation takes into account parameters external to the station processors provided by measurement sensors and / or receivers relating to these external parameters, and which communicate with a control unit of the station; and the regulation adjusts, by the control unit, the aeration cycles of the treatment plant and / or the dosages of treatment reagents, and / or the operation of the energy consuming devices of the station, in function of the information obtained on the external parameters. Advantageously, the regulation takes into account at least one of the following external parameters: analyzes and short-term forecasts of the hydraulic load and pollution to be treated by the station; - the state of the receiving natural environment continuously analyzed by a set of sensors located near the discharge of the treated water; - the energy market conditions to adapt the plant's flexibility of consumption to the availability and cost per kWh, - short-term weather forecasts, including air temperature, precipitation, speed and the direction of the wind, the periods of sunshine.

The control can take into account, in the control unit, information coming from the receiving environment provided by a plant equipped with sensors and analyzers that make it possible to carry out: direct measurements continuously of physicochemical parameters: pH, temperature , conductivity, dissolved oxygen, turbidity, nitrates and TOC and - online detection of priority substances, - pollution measurements integrated over time using passive samplers.

Advantageously, the regulation takes into account the nitrogen and / or phosphorus parameters, and for this purpose: measurements carried out continuously by sensors placed in the receiving medium make it possible to establish the nycthemeral cycle on the oxygen balance, concentration, saturation, and / or pH; and the enslavement of the equipment of the treatment plant is adapted when at least one of the following events occurs: either an exceeding of a maximum admissible amplitude of the nycthemeral cycle of oxygen level and / or the rate of oxygen saturation and / or pH; or crossing a threshold (minimum or maximum) on the oxygen level and / or the oxygen saturation level and / or the pH. - either exceeding a slope of the amplitudes of the nyctheméraux over several consecutive days, this gradual drift in the amplitude of daily nycthemeral cycles being a sign of increased sensitivity of the medium. The regulation may take into account the nitrogen and / or phosphorus parameters, as well as: measurements of the oxygen content, and / or the pH, and / or the nutrient contents and / or the flow rate, the temperature, of brightness, provided by measurement sensors installed in the receiving environment downstream of the treatment plant, - a measure of the sensitivity of the natural environment which receives the treated water from the treatment plant, and the regulation adjusts the cycles of aeration of the treatment plant and the dosages of treatment reagents when the analysis of the dycthemeral cycles of the parameters measured in the receiving medium reveals at least one of the following triggering events: maximum amplitude overflow, crossing of a minimum or maximum threshold for one or more of the parameters measured in the receiving medium. According to an advantageous arrangement: for a minimum permanent rejection set point, the method consists in maintaining the rejection below the permanent nominal rejection setpoint during the periods of increased sensitivity of the receiving medium; - ensure the minimum setpoint in normal periods, - for a minimum setpoint expressed as an annual average, or periodic, the process consists of modulating the level of discharge around the minimum setpoint, according to normal, sensitive and insensitive periods. The regulation can take into account energy market conditions and adapt the operating ranges of energy-consuming devices according to their flexibility, so that during periods with constraints, there is only one number of minimum consumer devices in use. To improve the economic efficiency of the station: - a buffer tank of water to be treated is planned, - the volume of treated water is increased during the hours when energy is cheaper, - and this volume is reduced during hours when energy is more expensive, the total processed volume for a given period of time remaining equal to that desired.

Advantageously, when a buffer tank of water is to be treated, meteorological forecasts are taken into account to increase the volume of treated water during periods of normal or low rainfall, and the volume of treated water is maintained. equal to optimal, during periods of heavy rain. The regulation can take into account the meteorological parameters to ensure a regulation of the deodorization and fume treatment reagents according to the speed and the direction of the wind, while remaining in the norms of emission, in order to preserve more the zones neighboring, using the phenomena of dispersion and fallout of the treated gases.

For the nitrogen and / or phosphorus parameters (and / or other parameters), the regulation may take into account: - measurements of the oxygen content, and / or the pH, and / or the nutrient contents (NO3, NH4 , NGL or global nitrogen, PO4) and / or other parameters (flow, temperature, brightness), provided by measurement sensors installed in the receiving medium downstream of the treatment station, - a measurement of the sensitivity of the medium which receives the water treated by the treatment plant (watercourse or other), and the regulation adjusts the aeration cycles of the treatment plant and the dosages of treatment reagents when the analysis of the dycthemeral cycles parameters measured in the receiving medium show at least one of the following triggering events: maximum amplitude overshoot, exceeding a slope of the amplitudes of the nycthemeral over several consecutive days, this gradual drift of the amplitude of s daily nycthemeral cycles are a sign of increased environmental sensitivity, crossing a minimum or maximum threshold for one or more of the parameters measured in the receiving environment. The measurements of the parameters are preferably carried out continuously.

According to the invention, the piloting method of a water treatment station is no longer based solely on predetermined static data, but adapts dynamically and in real time to the conditions forming part of its environment, such as the sensitivity the receiving environment, constraints and opportunities of electricity supply, weather forecasts and others.

The invention also relates to a biological treatment plant and / or physico-chemical wastewater characterized in that it comprises a control unit and a natural environment analysis unit, implementing a method as defined previously. The invention makes it possible to adjust, in real time, the operation of certain devices of the purification plant, thus to adapt the purification performances, as a function of the continuous measurement of all the data and forecasts relating to external parameters. , influencing its operation. The invention consists, apart from the arrangements set out above, in a number of other arrangements which will be more explicitly discussed below with respect to an embodiment described with reference to the accompanying drawings, but which is in no way limiting. In these drawings: 1 is a very simplified schematic diagram of a purification plant implementing the method according to the invention. Fig. 2 shows, on a larger scale, a part of the diagram of FIG. 1 with a more detailed representation of the block of the natural medium analysis unit. Fig. 3 is a curve illustrating the variation of the oxygen content, plotted on the ordinate, of a watercourse as a function of the time plotted on the abscissa, with an increase in the oxygen level during the day and a decrease during the night, according to a 24-hour cycle, called the "nycthemeral cycle" of oxygen. Fig. 4 is a diagram illustrating the variations in the phosphorus content, plotted on the ordinate, of a water treated according to the process of the invention, with respect to a minimum requirement of 1 mg / L permanently. 5 is a diagram illustrating the variations in the phosphorus content, plotted on the ordinate, of a water treated according to the process of the invention with respect to a minimum requirement of 1 mg / L in annual average, corresponding to the case encountered on more frequently. Fig. 6 is a diagram illustrating the variations in the phosphorus content, plotted on the ordinate, of treated water taking into account the fragility of the receiving medium represented by a curve as a function of time on the abscissa. Fig. 7 is a diagram illustrating a forecast energy consumption curve plotted on the ordinate, as a function of the time plotted on the abscissa. Fig. 8 is a diagram illustrating ranges of flexibility and operation for various energy consuming devices, with their consumed power, the time being plotted on the abscissa, and the power on the ordinate, and FIG. 9 represents a set of two diagrams illustrating the actuations of consumer devices taking into account periods with constraints of energy consumption. Regulation according to the receiving environment From a predictive base supported by a modeling taking into account external parameters of the natural environment, the real-time measurements make it possible to adapt the operation of the treatment station, that is to say of the plant, depending on the ability of the natural environment to receive the rejection. As illustrated in FIGS. 1 and 2, the operation of the treatment station E is controlled by a control unit C which controls the numerous devices of the station such as pumps, boosters, aerators, stirrers and others. Measurements are made by a plant 1 taking its sample near and upstream of the point of discharge 2 in the natural environment constituted by a stream W, according to the example considered, flowing in the direction of the arrow. F. The parameters measured upstream of point 2 constitute parameters external to station E and downstream from station E. The unit 1 is equipped with sensors and analyzers 1.n (the number n that can vary according to the number) which make it possible to carry out, as indicated in FIG. 2: direct measurements continuously of physicochemical parameters: pH , temperature, conductivity, dissolved oxygen, turbidity, nitrates and TOC (total organic carbon) and - online 4 detection of the priority substances listed in the Framework Directive (metals and organic substances) by means of spectrophotometric measurements and overall toxicity of the effluent; pollution measures integrated over time by means of passive samplers. The plant 1 can integrate, on the other hand, specific analyzers for the detection of the priority substances of the Framework Directive. It can also allow the detection of organic substances sensitive to UV. The levels of nitrates and total organic carbon (TOC) can also be determined by this plant 1, in particular by direct spectrophotometric analysis of a sample. The plant 1 can also evaluate, as shown schematically in block 6, the overall toxicity of the effluent by means of luminescent bacteria, of the Vibrio 10 fischeri type. The decrease of the light emitted by these organisms between the test sample and a reference sample is an indicator of the presence of a toxin in the effluent. The plant 1 may also include passive samplers, making it possible to extract trace micro-pollutants from the environment, providing information complementary to that of on-line sensors and analyzers. The various functions, performed by the sensors and analyzers of the central unit 1, are then aggregated by means of software developing a specific function, and implementing weights for each of the parameters. The final result is used to control the operating parameters of the treatment plant. Depending on the parameters measured by the plant 1, the parameters characterizing the water treatment are adjusted in such a way that the conditions of the natural environment are not degraded, and as far as possible are improved. This optimization is ensured at minimum cost. The control unit C of the purification plant (or STEP) also takes into account information received from sensors or transmitters: Q1 providing information from the wastewater network; - Q2 providing details of climatic and meteorological conditions, including direction and wind speed; - Q3 providing information from the smart grid - Q4 providing other external information; - Q5 providing release standards.

Example of a regulation according to the receiving environment The study of the dystrophy of the rivers showed that it is often the phosphorus which is the nutrient determining for the development of phenomena harmful to the state of health of the natural environment . However, it has been demonstrated that the level of dystrophy of a watercourse can be estimated by the analysis of the nycthemeral cycle of certain physicochemical parameters, in particular the oxygen balance (saturation rate, concentration) and the pH . For nycthemeral monitoring, the method of the invention provides for the installation of continuous measurement sensors 1.n in the stream W, with remote transmission of data to the control system 1, C of the station of purification E.

The objective is to adapt the purification performances to the nitrogen and phosphorus parameters, as a function of the continuous measurement, in the natural receiving environment W, of various physicochemical parameters representative of its state of health. This makes it possible to better protect the natural environment W (primary objective of a treatment plant), in particular when it is the most fragile, while respecting the minimum regulatory requirements. The performance of the treatment plant on the phosphorus parameters (global phosphorus, phosphates, etc.) depends on the quantity of chemical reagent added to the water to be treated. The process of the invention makes it possible to improve the treatment by increasing the dose of reagent added, at the most just for a minimum cost, when the state of the natural medium W justifies it. The performance of the treatment plant on the nitrogen parameters (global nitrogen, nitrates, etc.) depends on the aeration and non-aeration phases (duration, intensity of aeration, etc.). The method of the invention makes it possible to improve the treatment, in particular during the periods during which the purification plant is below its nominal load (that is, the vast majority of the time) by extending the duration of the aerated phase.

The continuous measurement sensors placed in the receiving medium W make it possible to establish the nycthemeral cycle on the oxygen balance (concentration, saturation rate) and / or the pH. This cycle generally has a sinusoidal appearance (FIG. 3) illustrating a cycle composed of a phase of increasing J1 of the oxygen concentration during the day and of reducing J2 during the night. The quantification of the eutrophication phenomenon can then be related to the maximum variations on the day (the greater the variation, the stronger the dystrophy). The enslavement of the equipment of the treatment plant (aerators and / or metering pumps of reagents) is adapted when at least one of the following events occurs: - either exceeding a maximum admissible amplitude of the diel rate cycle. oxygen and / or saturation rate of oxygen and / or pH, - either crossing a threshold (minimum or maximum) on the oxygen level and / or the rate of oxygen saturation and / or the pH. or the exceeding of a slope of the amplitudes of the nyctheméraux over several consecutive days, this gradual drift in the amplitude of daily nycthemeral cycles being a sign of an increased sensitivity of the medium. The setpoints depend on the watercourse W (or other natural environment) concerned, since each watercourse is unique and has its own characteristics, constituting its "fingerprint". The accuracy of the regulation of the treatment plant equipment (aerators and metering pumps reagents) may optionally be supplemented by a measurement of nitrogen compounds and / or phosphorus on the water treated at the outlet of the treatment plant. To complete the example, it is possible to provide a continuous measurement 8 (FIG. 2) of one or more other parameters in the watercourse W such that: nitrates, nitrites, global nitrogen, orthophosphates, total phosphorus , flow, temperature, brightness. The triggering of the adjustment of the aeration cycles and / or dosages of chemical reagents is then performed on crossing high or low thresholds, prerecorded according to the characteristics of the watercourse. Nitrates, phosphates, orthophosphates are nutrients that cause excessive development of plants in rivers. - Nitrites are toxic to the fish population by inhibiting their breathing. - The flow and temperature of the watercourse affect its sensitivity to eutrophication: maximum treatment performance is adjusted when the flow is the lowest.

The invention thus makes it possible to improve, in real time, the performance of the purification plant E on the nitrogen and / or phosphorus parameters (and / or on the other parameters) as a function of the continuous measurement by sensitivity sensors. of the receiving medium W of the treated wastewater.

Two main applications are possible: - A Configuration I, for a minimum permanent rejection setpoint, corresponds to the example illustrated in FIG. 4 and consists in: - maintaining the rejection below the minimum permanent rejection setpoint during the periods of increased sensitivity of the receiving medium: for example, for a minimum permanent setpoint of 1 mg / L, during periods of increased susceptibility S1, S2 of the receiving medium, the discharge will be ensured with a phosphorus content reduced to 0.8 mg / L - Ensure the minimum setpoint, 1 mg / l phosphorus rejection according to the example, in normal periods N1, N2, N3.

Maximum protection of the receiving medium is ensured with a minimum increase in operating cost. A configuration II, for a minimum setpoint expressed as an annual average (or periodic), corresponds to the example illustrated in FIG. 5 and consists in modulating the level of rejection around the minimum setpoint. For example, for a minimum requirement of 1 mg / L of phosphorus on annual average, depending on the sensitivity of the receiving medium, the configuration will ensure a release to: - 1 mg / L in normal period N, - 0.8 mg / I in sensitive periods S1, S2, - 1.2 mg / I in periods of low sensitivity P1, P2. Improved protection of the receiving medium is ensured, without impact on the cost of operation.

In both scenarios, the protection of the natural environment is improved, which reinforces the main purpose of a wastewater treatment plant, with a negligible impact on the investment cost, and a low or no impact. on the operating cost, depending on the operating mode chosen: configuration I or II. In FIG. 6, an example of a fragility of a receiving medium has been represented by a dotted curve K of the variations, in the receiving medium, of the oxygen content, according to the right scale of the ordinates as a function of the time taken. on the abscissa. The phosphorus content of the rejection according to the invention is represented by the curve K1, according to the scale on the left of the ordinates. The curve K1 even looks like the curve K and does not exceed the straight line limit L1 corresponding to the discharge standard (average), for example 1 mg / l of phosphorus. The curve K1 is tangent to the limit L1 for its maximum values. Line L2, located entirely below Ll corresponds to the content of the rejection without implementation of the method of the invention. For the periods of greater fragility of the receiving medium, corresponding to the lower parts of the K-curve, and the lower values of the oxygen content, the protection of the natural medium is improved by the curve K 1, according to the invention, relative to the L2 line of a conventional treatment. Regulation according to the energy market conditions Although the energy consumed is mainly electricity, the explanations given below apply to all forms of energy consumed, in particular gas or fuel oil, which may be used in heating or drying devices, or any fuel-consuming process generally. On a predictive basis supported by modeling according to the different internal or external parameters, the water treatment station adapts its operation and deduces the energy consumption curve, consumer device per consumer device, indicating the possible ranges of flexibility of operation. . The following curves are given by way of illustrative, non-limiting example.

Curve G (FIG. 7) represents the forecast curve of energy consumption, plotted on the y-axis and expressed in kW, modeled from the available internal and external data (norms, meteorological conditions, load to be treated, state of the receiving environment) over a period given time, for example 24 hours. The modeling mentioned above is for example programmed using the principle of "watch for the next day". The consumer devices are mainly the following ones within a wastewater treatment station, this list not being exhaustive: Air supply machines of any kind (biological treatment, agitation of the membranes), biogas compressors, Pumps of all kinds, in particular clarifier recirculation pumps to biological treatment and recovery pumps, agitators of biological treatment reactors, fans of any kind (deodorization, building ventilation), the main dehydration equipment sludge (centrifuges, piston presses, press filters), thermal sludge dryers, boilers used for flotation, agitators of all kinds (polymer preparation, desulfurization treatment). It should be noted that, on a sewage treatment plant, most of these consumer devices can accept a temporary interruption of their service.

The know-how and the experience of the operator of the station make it possible to determine broad flexibility ranges for the momentary activation of these consumer devices. Fig.8 is a diagram on which the time is plotted on the abscissa, and the absorbed power, in kW, is plotted on the ordinate. For three consumer devices C1, C2, C3 have been represented: - in full line, the operating ranges C1, C12; C21, C22; C31 - dotted, the flexibility ranges X11, X12; X21, X22.

According to this example, the consumer device C3 must operate continuously over the period of time considered, especially 24 hours, while the consumer devices C1, C2 have flexibility ranges X11, X12; X21, X22 which can move over time the operating ranges to distribute the power consumption taking into account supply periods with constraints H1, H2 according to Fig.9. The manager of the energy supply system warns with a definite notice, for example 13 minutes, 30 minutes, less than 2 hours, ... that time slots will be periods H1, H2 (Fig.9) with constraints, or for the quantity of energy that can be delivered, for the tariff conditions; the control system C of the treatment plant E reacts by adapting the operating ranges of the consumer devices, such as C1, C2 according to their flexibility, so that during periods with constraints, there is only a minimum number of consumer devices in use. The curve G of FIG. 7 becomes the curve G1 of FIG. 9 with a reduced consumption during periods with stresses H1, H2 thanks to the appropriate sliding over time of the operating periods of the equipment according to the preset flexibility. A posteriori the actual consumption curve of the station is compared with the expected consumption curve to validate the value created by the short-term flexibility implemented.

As a variant of the previous case, the operating ranges of the various consumer devices of the station could be decided, not by the station itself, but by the energy system manager, the latter receiving from the treatment station, predicted consumption curves such as G, and flexibility ranges such as X11, X12, X21, X22. The examples of possible regulation according to the invention, as a function of external parameters, are numerous and depend on the equipment used on the wastewater treatment plant. There may be mentioned the case of a treatment station equipped with a sludge dryer; Due to the extended residence time of the sludge in the drying greenhouse, real-time accounting and forecasting of sunshine parameters and the cost of extra energy allow significant savings by optimizing the use extra energy.

Another example is that of a treatment plant in a sensitive zone equipped with deodorization and sludge incineration. Controlling the deodorization and flue gas treatment reagents according to the speed and direction of the wind allows, while remaining in the emission standards, to further preserve the neighboring areas, by using the phenomena of dispersion and fallout. treated gases. The method of the invention leads to an intelligent treatment station interfering with all of its environment (Energy Network, Sanitation Network, Air, state of the receiving medium). The following advantages can be cited: - Taking into account the permissible limits of the treatment plant environment and process stability, better environmental conditions (state of the receiving environment and air) - Reduction of energy bill of the station by valuing the erasures on the smart grid system - Profit from the weakest electricity demand in summer to further protect the more fragile environments at that time and treat odors that develop more when temperatures are high without increase in energy bill - Protection of the environment of the station (treated water and air) all year long by limiting the use of electricity production peaks using fossil fuels (global reduction of GHG greenhouse gases).

The invention makes it possible: to reject in the natural environment a treated water which is not only in conformity with the standards in force but also which takes into account the sensitivity of the natural environment at the time of the rejection, to optimize the use of the available energies taking into account supply constraints and cost variations in real time, - optimizing the use of consumables (reagents, ...), - and minimizing the inconvenience caused to the environment.

Claims (11)

REVENDICATIONS1. A method for real-time regulation of the performance of a biological and / or physico-chemical sewage treatment station (E), characterized in that: the regulation takes into account parameters external to the treatment station provided by measurement sensors and / or receivers relating to these external parameters, and which communicate with a control unit (C) of the station; And the regulation adjusts, by the control unit (C), the aeration cycles of the purification plant and / or the dosages of treatment reagents, and / or the operation of the energy consuming devices of the station, depending on the information obtained on the external parameters. 15 2. Method according to claim 1, characterized in that the regulation takes into account at least one of the following external parameters: - analyzes and short-term forecasts of the hydraulic load and pollution (Q1) to be processed by the station; the state of the receiving natural medium analyzed continuously by a set of 20 sensors (1.n) located near the discharge (2) of the treated water; - the conditions (Q3) of the energy market to adapt the flexibility of consumption of the plant to the availability and the cost per kWh. short-term weather forecasts (Q2), including air temperature, precipitation, wind speed and direction, and sunshine periods. 3. Method according to claim 1 or 2, characterized in that the control takes into account, in the control unit (C), information from the receiving medium provided by a central unit (1) equipped with sensors and analyzers ( 1.n) which make it possible to carry out: direct measurements continuously (3) of physicochemical parameters: pH, temperature, conductivity, dissolved oxygen, turbidity, nitrates and TOC and an on-line detection (4) of the substances Priority 35 - Pollution measures (5) integrated over time using passive samplers. 4. Method according to claim 3, characterized in that the regulation takes into account nitrogen and / or phosphorus parameters, and in that - measurements carried out continuously by sensors placed in the receiving medium (W) make it possible to establish the nycthemeral cycle on oxygen balance, concentration, saturation rate, and / or pH; and the enslavement of the equipment of the treatment plant is adapted when at least one of the following events occurs: either an exceeding of a maximum admissible amplitude of the nycthemeral cycle of oxygen level and / or the rate of oxygen saturation and / or pH; - either crossing a threshold (minimum or maximum) on the oxygen level and / or the oxygen saturation rate and / or the pH, - or exceeding a slope of the amplitudes of the nycthemeral over several days consecutive, this gradual drift of the amplitude of daily nycthemeral cycles being a sign of increased sensitivity of the environment. 5. Method according to claim 3 or 4, characterized in that the regulation takes into account nitrogen and / or phosphorus parameters, as well as: - measurements of the oxygen content, and / or pH, and / or levels in nutrients 20 and / or flow rate, temperature, brightness, provided by measurement sensors (1.n) installed in the receiving medium downstream of the treatment station, - measurements in the receiving natural environment of physicochemical parameters representative of its state of health, and the regulation adjusts the aeration cycles of the purification station and the dosages of treatment reagents when the analysis of the nycthemeral cycles of the parameters measured in the receiving medium. shows at least one of the following triggering events: maximum amplitude overshoot, crossing a minimum or maximum threshold for one or more of the measured parameters in the receiving environment. 6. Method according to any one of claims 3 to 5, characterized in that: - for a permanent minimum setpoint of rejection, the method consists in maintaining the rejection below the minimum permanent setpoint of rejection during periods (S1, S2) increased sensitivity of the receiving medium; - ensure the minimum setpoint in normal periods (N1, N2, N3) - for a minimum setpoint expressed as an annual average, or periodic, the method consists in modulating the rejection level around the minimum setpoint, according to normal periods (N) , sensitive (S1, S2) and insensitive (P1, P2). 7. Method according to claim 3, characterized in that the regulation takes into account the market conditions of energy and adapts the operating ranges (C11, C12, C21, C22) of energy consuming devices (C1, C2 ) according to their flexibility, so that during periods with constraints (H1, H2), there is only a minimum number of consumer devices in use. 8. Process according to claim 7, characterized in that, in order to improve the economic yield of the station: a buffer tank of water to be treated is provided, the volume of treated water is increased during the hours when the energy , is cheaper, - and reduces this volume during times when energy is more expensive. the total processed volume for a given period of time remaining equal to that desired. 9. A method according to claim 8, characterized in that, to improve the economic efficiency of the station: - meteorological forecasts are taken into account to increase the volume of treated water during periods of normal or low rainfall, - and maintains the volume of treated water equal to that optimum during periods of heavy rain. 10. Process according to any one of the preceding claims, characterized in that the regulation takes into account the meteorological parameters to ensure a regulation of the deodorization and flue gas treatment reactants as a function of the speed and direction of the wind, while remaining in the emission standards, in order to further preserve the neighboring areas, using the phenomena of dispersion and fallout of the treated gases. 11. Biological and / or physico-chemical treatment plant of wastewater characterized in that it comprises a control unit (C) and a natural environment analysis center (1) implementing a method according to one any of the preceding claims.5