EP2312508A1 - Sewage treatment plant with follow-up of the environmetal impact - Google Patents

Abstract

The station (10) comprises a reactor for treating water, sensors (28) for instantaneously measuring intake of substance, sensors (32) for instantaneously measuring discharge of substances, sensors for instantaneously measuring energy consumption of the reactor, an environmental footprint database, a calculation unit, a unit for providing calculated environmental impact, a gripping unit, and a unit for calculating cumulative environmental impact with part of the calculated environmental impact and periods between the instantaneously calculated environmental impacts. The station (10) comprises a reactor for treating water, sensors (28) for instantaneously measuring intake of substance, sensors (32) for instantaneously measuring discharge of substances, sensors for instantaneously measuring energy consumption of the reactor, an environmental footprint database, a calculation unit, a unit for providing calculated environmental impact, a gripping unit, and a unit for calculating cumulative environmental impact with part of the calculated environmental impact and periods between the instantaneously calculated environmental impacts. The environmental footprint database includes elementary environmental footprint of intaken substance, discharged substance and measured energy consumption. The calculation unit is configured for continuously calculating each environmental impact determined from the measured values of the intaken substance, discharged substance and measured energy consumption.

Description

The present invention relates to a water treatment plant of the type comprising at least one water treatment reactor.

Nowadays, water treatment plants contribute to the improvement of environmental conditions, by eliminating waste water, a certain number of harmful constituents for the environment, before discharge of treated water into the environment. .

The water treatment plant consumes energy, as well as reagents, and releases into the environment recyclable or non-recyclable waste as well as treated water that still contains certain substances that may be harmful to the environment.

During the design of the water treatment plant, it is known to establish an analysis of the life cycle of the station, allowing from the inflow and outflow to determine the environmental impacts of the station during its operation.

An analysis of the life cycle is carried out for example using TEAM software marketed by the company PriceWathersCoopers.

These environmental impacts are defined for steady-state operation of the station. However, during the life of the station, it does not always operate in steady state and some adjustments or modifications can reduce or increase the consumption of certain reagents or energies and reduce or increase the waste produced by the station.

Under these conditions, it is necessary to periodically recalculate the environmental impacts from a life cycle analysis under the real conditions of the station.

To establish a life cycle analysis, it is necessary to accurately model the operation of the station, which can be complicated and time consuming.

The purpose of the invention is to make it easier to determine the real environmental impacts of a water treatment plant.

• des capteurs de mesure instantanée de l'apport en substances apportées ;
• des capteurs de mesure instantanée des rejets en substances rejetées ;
• des capteurs de mesure instantanée des consommations énergétiques du réacteur ;
• une base de données des empreintes environnementales comportant les empreintes environnementales élémentaires de chaque substance apportée, chaque substance rejetée, chaque consommation énergétique mesurée, sur au moins un impact environnemental déterminé ;
• des moyens de calcul en continu du ou de chaque impact environnemental instantané déterminé à partir :
  • des valeurs mesurées de l'apport en substances apportées et des rejets en substances rejetées et des mesures instantanées des consommations énergétiques ;
  • des empreintes environnementales élémentaires de chaque substance apportée, chaque substance rejetée et chaque consommation énergétique mesurée sur le ou chaque impact environnemental déterminé ;
  et
• des moyens de mise à disposition du ou de chaque impact environnemental instantané calculé.

For this purpose, the subject of the invention is a water treatment station of the aforementioned type, characterized in that it comprises:

• sensors for instant measurement of the input of substances introduced;
• sensors for instantaneous measurement of releases of discharged substances;
• sensors for instant measurement of reactor energy consumption;
• a database of environmental footprints containing the elementary environmental footprints of each substance added, each substance released, each measured energy consumption, on at least one determined environmental impact;
• means for continuously calculating the or each instantaneous environmental impact determined from:
  • measured values of the input of substances and releases of substances released and instantaneous measurements of energy consumption;
  • elementary environmental footprints for each substance being added, each substance released, and each energy consumption measured on the or each identified environmental impact;
  and
• means for providing the or each instantaneous environmental impact calculated.

• la base de données des empreintes environnementales comporte les empreintes environnementales élémentaires résultant du transport de chaque substance apportée, chaque substance rejetée, chaque énergie consommée, sur au moins un impact environnemental déterminé ;
  • ■ des moyens de saisie de la distance parcourue par chaque substance apportée, chaque substance rejetée, chaque consommation énergétique mesurée ; et
  • ■ des moyens de calcul sont propres à calculer en continu le ou chaque impact environnemental instantané déterminé à partir :
    • des valeurs saisies des distances parcourues par les substances apportées, les substances rejetées et les énergies consommées ; et
    • des empreintes environnementales élémentaires résultant du transport de chaque substance apportée, chaque substance rejetée et chaque énergie consommée, sur au moins un impact environnemental déterminé.
• la station comporte :
  • des moyens de calcul du ou de chaque impact environnemental cumulé à partir des impacts environnementaux instantanés calculés et des périodes entre les calculs des impacts environnementaux instantanés ; et
  • des moyens de mise à disposition du ou de chaque impact environnemental cumulé calculé.
• la station comporte :
  • des moyens de saisie de distances cumulées parcourues par le personnel exploitant la station ;
  • la base de données des empreintes environnementales comporte les empreintes environnementales élémentaires résultant du transport du personnel exploitant la station sur le ou chaque impact environnemental déterminé ;
  • es moyens de calcul du ou de chaque impact environnemental cumulé sont propres à effectuer le calcul du ou de chaque impact environnemental cumulé en outre à partir :
    • des valeurs saisies des distances cumulées parcourues par le personnel exploitant la station ; et
    • des empreintes environnementales élémentaires pour chaque distance parcourue par le personnel exploitant la station sur le ou chaque impact environnemental déterminé.

According to particular embodiments, the water treatment station may comprise one or more of the following characteristics, taken separately or in any technically possible combination:

• the environmental footprint database contains the elementary environmental footprints resulting from the transport of each substance, each substance released, each energy consumed, on at least one specific environmental impact;
  • ■ means for recording the distance traveled by each substance supplied, each substance released, each measured energy consumption; and
  • Calculation means are capable of continuously calculating the or each instantaneous environmental impact determined from:
    • entered values of distances traveled by the substances supplied, the substances released and the energy consumed; and
    • elementary environmental footprints resulting from the transportation of each substance, each substance released and each energy consumed, to at least one specific environmental impact.
• the station comprises:
  • means for calculating the or each cumulative environmental impact from the instantaneous environmental impacts calculated and the periods between the calculations of the instantaneous environmental impacts; and
  • means for making available the or each calculated cumulative environmental impact.
• the station comprises:
  • cumulative distance acquisition means traveled by the personnel operating the station;
  • the environmental footprint database includes basic environmental footprints resulting from the transportation of personnel operating the station on the or each identified environmental impact;
  • The means of calculating the or each cumulative environmental impact are suitable for calculating the or each cumulative environmental impact in addition from:
    • values of cumulative distances traveled by personnel operating the station; and
    • basic environmental footprints for each distance traveled by personnel operating the station on the or each identified environmental impact.

• la figure 1 est une vue schématique d'une installation de traitement d'eau selon l'invention ;
• la figure 2 est une vue schématique d'un étage de traitement de la station de la figure 1 ;
• la figure 3 est une reproduction d'un écran d'affichage montrant pour différents impacts environnementaux, la valeur instantanée et la totalisation annuelle ;
• la figure 4 est un organigramme du mode de détermination des impacts environnementaux par la station ; et
• la figure 5 est un histogramme montrant pour une année les valeurs prévues et réalisées pour l'un des impacts environnementaux cumulés mensuellement.

The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the drawings in which:

• the figure 1 is a schematic view of a water treatment plant according to the invention;
• the figure 2 is a schematic view of a treatment stage of the station of the figure 1 ;
• the figure 3 is a reproduction of a display screen showing for different environmental impacts, instantaneous value and annual totalization;
• the figure 4 is a flowchart of how the station determines the environmental impacts; and
• the figure 5 is a histogram showing for a year the expected and realized values for one of the monthly cumulative environmental impacts.

The water treatment station 10 shown on the figure 1 comprises a water treatment chain 12 and an installation 14 for determining the environmental impacts of the station during its operation.

The processing line 12 comprises several processing stages, namely a pretreatment stage 16, a primary treatment stage 18, a biological treatment stage 20, an optional tertiary treatment stage (not shown), and a sludge treatment stage. 22. Each treatment stage comprises a tank or any other reactor volume 24 receiving the stream to be treated from the previous stage and whose output is connected to the next processing stage.

As known per se, each treatment stage comprises means 26 for supplying a reagent into the tank 24. These means consist for example of one or more injection nozzles. The injected reagents can be of several kinds; such as acids, bases, polymers, coagulants, nutrients, air or more generally any substance brought.

The facility 14 for determining the environmental impacts comprises, for each means of supplying a reagent, an instantaneous flow rate sensor 28 connected to a processing unit 30.

The inputs and outputs of the processing chain 12, as well as any discharge openings of the tanks 24 are equipped with sensors 32 for instantaneous flow measurement. These sensors 32 are each connected to the processing unit 30.

Finally, each of the treatment stages 16 to 22 are supplied with energy by power distribution networks, such as the electricity network 34 or the natural gas network 36. These networks are, upstream of the treatment stages each equipped with a counter 38A, 38B for measuring the energy consumed specific to each treatment stage. These counters are connected to the information processing unit 30.

In addition, the processing unit 30 is connected to additional data acquisition means 40 for calculating the environmental impacts.

On the figure 2 the treatment plant 30 and its connections to a single treatment stage formed, for example, of the biological treatment stage 20 are shown in greater detail.

This figure shows the counters 38A, 38B, the information processing unit 30 and the input means 40. The tank 24 is equipped with an inlet 42 and an outlet 44. In addition, the The vessel is equipped with means 26A for injecting ferric chloride (FeCl ₃ ) and with means 26B for injecting air if the station is large. These means 26B comprise for example a fan 48 supplied from the power supply network 34.

The injection means 26A and 26B are each equipped with a flowmeter 28A, 28B respectively adapted to determine the instantaneous flow rate of ferric chloride and air introduced into the tank 24.

The flowmeter 28B measuring the amount of air injected is used for the regulation of the introduced air either by a measurement of oxygen or by other measurements of the nitrate and ammonia type.

In addition, a biogas sensor 32A is placed above the tank to determine the flow rate of instantaneous biogas released by the treated water in the tank. Similarly, a sensor 32B provided on the outlet 44 to determine the instantaneous value of the Chemical Oxygen Demand (COD), that is to say the amount of oxygen necessary for the chemical oxidation of the organic materials contained in the flow exiting through exit 44.

The sensors 28A, 28B, 32A, 32B are each connected to a computer 50 of the processing unit 30. The meters 38A, 38B are also connected to the same computer 50.

This calculator 50 is formed for example of a microprocessor and software and hardware means specific to its operation.

The processing unit 30 further comprises a first database 52 comprising the unit environmental impact for each substance brought into the treatment chain, for each substance rejected and for each type of energy consumed.

Furthermore, the unit 30 comprises a second database 54 comprising the algorithms for calculating the instantaneous and cumulative values of the environmental impacts from the data of the base 52 and of the instantaneous values measured by the sensors present on the installation, as well as that additional data entered from the means 40.

Finally, the processing unit 30 includes means 56 for restoring the determined environmental impacts. These means comprise for example a display screen, or recording means in a database accessible by any suitable means, in particular through the Internet.

• réchauffement climatique ;
• énergie primaire ;
• épuisement des ressources ;
• acidification atmosphérique ;
• oxydants chimiques ;
• déchets ;
• eutrophisation ;
• rejet en MES ; et
• rejet en matières oxydables.

As illustrated on the figure 3 the environmental impacts monitored are, for example, nine in number. For example, these are the values of the following environmental impacts:

• global warming ;
• primary energy;
• resource depletion ;
• atmospheric acidification;
• chemical oxidants;
• waste;
• eutrophication;
• rejection in MES; and
• rejection of oxidizable materials.

For each of these environmental impacts, an instantaneous value is provided to the user by the means 56 of the installation 14. It is illustrated by a bargraf 60 whose length represents the quantity expressed. The cumulative value, for example, in a year for each environmental impact is also displayed in 62.

The instantaneous value is expressed in a unit determined per time unit while the accumulated value is expressed in that determined unit.

The algorithm stored in the database 54 in the form of a computer program and implemented by the calculator 50 will now be described with reference to FIG. figure 4 .

The determination of the environmental impact is carried out for each stage 16 to 22 during independent steps 116, 118, 120, 122. Only step 120 will be described in detail, the other steps being analogous.

The figure 4 schematically represents the calculations for each individual step corresponding to a treatment stage and their agglomeration, taking into account for the cumulative value of the environmental impacts due to the transport of the personnel necessary for the operation of the station are determined in a step noted 130.

Each individual determination step outputs, for each of the nine instantaneous environmental impacts, a value l (t) _ij where i represents the processing stage and j represents the index designating the environmental impact concerned. In the example considered, i is between 1 and 9 since nine environmental impacts are taken into consideration.

These values for each of the nine environmental impacts are instantaneous values calculated at the sampling frequency of the sensors 28, 32 and 38 used.

For step 130, the cumulative environmental impact resulting from the transport of personnel is expressed for the nine environmental impacts considered in the form of a cumulative value per month or year designated by C (t) _{130, j} for j = 1 to 9.

The value C (t) _{130, j} is, for example, entered monthly from the means 40.

In step 220, the instantaneous environmental impacts are accumulated for each of the four processing stages 16, 18, 20 and 22 at each instant to give a total instantaneous environmental impact value denoted I (t) _Tj where j takes a value of 1 to 9. Thus, the sum for each of the nine environmental impacts of the values obtained in steps 116, 118, 120, 122 is carried out in the form: $${\left(I{\left(t\right)}_{T,j}\right)}_{j=1\mathit{at}9}={\left(I{\left(\mathrm{<figure-callout\; id="16"\; label="t"\; filenames="imgf0001.png,imgf0004.png"\; state="\{\{state\}\}">t</figure-callout>}\right)}_{16,j}\right)}_{j=\mathrm{1}\mathit{at}\mathrm{9}}+{\left(I{\left(\mathrm{<figure-callout\; id="18"\; label="t"\; filenames="imgf0001.png"\; state="\{\{state\}\}">t</figure-callout>}\right)}_{18,j}\right)}_{j=\mathrm{1}\mathit{at}\mathrm{9}}+{\left(I{\left(\mathrm{<figure-callout\; id="22"\; label="t"\; filenames="imgf0001.png,imgf0004.png"\; state="\{\{state\}\}">t</figure-callout>}\right)}_{22,j}\right)}_{j=\mathrm{1}\mathit{at}\mathrm{9}}$$

In step 222 is calculated for each of the environmental impacts the cumulative value noted C (t) _{T, j} at time t from the cumulative value C (t-1) _{T, j} at the previous instant. I (t) _{T, j} and the instantaneous value measured at the current instant I (t) _{T ,, j} multiplied by the sampling period denoted by A in the form: $${\left(\mathrm{VS}{\left(t\right)}_{T,j}\right)}_{j=1\mathit{at}9}={\left(\mathrm{VS}{\left(t-1\right)}_{T,j}\right)}_{j=1\mathit{at}9}+{\left(I{\left(t\right)}_{T,j}\right)}_{j=1\mathit{at}9}\mathit{\lambda }$$

In step 224 is calculated, for each environmental impact, the cumulative total value C _c (t) _{T, j} including the cumulative value C (t) _{T, j} at the instant t calculated in step 222 and the value cumulated c (t) _{130, j} corresponding to the transport of personnel in the form: $${\left({\mathrm{VS}}_{\mathrm{vs}}{\left(t\right)}_{T,j}\right)}_{j=1\mathit{at}9}={\left(\mathrm{VS}{\left(t\right)}_{T,j}\right)}_{j=1\mathit{at}9}+{\left(\mathrm{<figure-callout\; id="130"\; label="VS\; \; t"\; filenames="imgf0004.png"\; state="\{\{state\}\}">VS\; </figure-callout>}{\left(t\right)}_{}{\left(\right)}_{130,j}\right)}_{j=1\mathit{at}9}$$

In step 226, the instantaneous and cumulative values of each environmental impact are displayed on the means of provisioning 56 according to the format illustrated in FIG. figure 3 .

Steps 116 to 226 are thus implemented in a loop.

For the determination of one of the instantaneous values of the environmental impacts of one of the treatment stages, the values recorded by the sensors, as well as the data contained in the base 152 are implemented.

Thus, the base 52 comprises for each substance supplied, for each substance released, and for each type of energy consumed, the instantaneous environmental footprint corresponding to each environmental impact.

For example, for the ferric chloride constituting a substance supplied, the instantaneous environmental imprints are as follows. <b><u> TABLE A1 </ u></b> Global warming
IPCC-Greenhouse effect 2008 (direct, 100 years) 0.290 kg eq CO ₂ / kgFeCl3 * / h Primary energy
Reminder team 5.9 MJ / kgFeCl3 * / h Resource depletion
CML2000-Depletion of abiotic resources 0.0016 kg eq Sb / kgFeCl3 * / h Atmospheric acidification
CML2000-Air Acidification 0.00344 kg eq SO2 / kgFeCl3 * / h Photochemical oxidants
CML2000-Photo oxidant training 0.000011 kg ethylene eq / kgFeCl3 * / h Waste
Flow method 0.02 kg / kgFeCl3 * / h eutrophication 0.00018 kg eq PO4 / kgFeCl3 * / h CML2000-Eutrophication Rejection in MES
Flow method 0.0017 kg / KgFeCl3 * / h Discharge in oxidizable materials
Flow method 0.0000016 kg COD / KgFeCl3 * / h * commercial product

For example, for biogas that is a rejected substance, the instantaneous environmental footprints are as follows. <b><u> TABLE A2 </ u></b> Global warming - 0.683552 kgCO2 / Nm3 / h Primary energy - 34.56 MJ / Nm3 / h Resource depletion - 0.00656 kg / Nm3 / h Atmospheric acidification + 0.000489283 kg / Nm3 / h Photochemical oxidant +0,000136554 kg / Nm3 / h Waste - 0.02927 kg / Nm3 / h eutrophication +0.296803 kg / Nm3 / h Rejection in MES - 0.39564 kg / Nm3 / h Discharge in oxidizable materials -0.00211 kg / Nm3 / h

With regard to certain environmental impacts, biogas is a benefit in primary energy. Indeed biogas has a variable PCI between 6.2 and 6.4 kW / Nm3 / h of biogas. Part of this energy is converted into electrical energy and another part into thermal energy.

More generally, such a table is stored for each substance supplied, and each substance rejected. Environmental footprints for each environmental impact are defined per unit of flow, in particular in kg / h.

For each energy consumed, an environmental impact table is also stored with each of the elementary footprints in the base 52. These instantaneous environmental footprints are each indicated in energy flow, for example in kW / hour. For electrical energy, these environmental footprints are taken as: <b><u> TABLE B </ u></b> Global warming 0.1574958 kg CO ₂ eq / Kwh / h Primary energy 3,17989 MJ / Kwh / h Resource depletion 0,00113472 kg eq Sb / Kwh / h Atmospheric acidification 0.00013 kg eq SO2 / Kwh / h Photochemical oxidants 0.0007120503 kg ethylene eq / Kwh / h Waste 0.01344 kg / KgKwh / h eutrophication 0.00003228225 kg eq PO4 / KgKwh / h Rejection in MES 0.00002 kg MS / Kwh / h Discharge in oxidizable materials 0.00000018 kg COD / Kwh / h

In addition, for the road transport of the substances supplied and / or the rejected substances, the environmental footprint of the transport is memorized for each environmental impact for example with the values specified below. These instantaneous environmental footprints are expressed per kilogram of substance transported. <b><u> TABLE C </ u></b> Global warming 0.00082 kg CO2 eq / km / kg reagents Primary energy 0.01 MJ / km / kg reagents Resource depletion 0.0000048 kg eq Sb / km / kg reagents Atmospheric acidification 0.0000049 kg eq SO2 / km / kg reagents Photochemical oxidants 0.000000092 kg ethylene eq / km / kg reagents Waste 0 kg / km / kg reagents eutrophication 0.0000012 kg eq PO4 / km / kg reagents Rejection in MES 0.00000001 kg / km / kg reagents Discharge in oxidizable materials 0.00000001 kg COD / km / kg reagents

In step 120, for example for calculating the instantaneous values of the environmental impacts resulting from the treatment stage 20, the different flow rates recorded by the sensors 28A, 28B, 32A, 32B and 38A to 38C are read and their contribution to the environmental impact is calculated from the corresponding instantaneous environmental imprints stored in the base 52.

Thus, for step 120, it is calculated in step 302, for each environmental impact, the impact, the value resulting from the ferric chloride and the air consumption. It is calculated respectively from the measured flow rate of ferric chloride D _28A multiplied by the environmental footprint resulting from ferric chloride C _FeCl3 and from the air flow D _28D multiplied by the environmental footprint corresponding to the air intake C _air Under the form : $${\mathrm{<figure-callout\; id="28"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{\mathrm{28}\mathrm{AT}}x{\mathrm{VS}}_{\mathrm{FeCl}\mathrm{3}}\mathrm{+}{\mathrm{<figure-callout\; id="28"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{\mathrm{28}\mathrm{B}}x{\mathrm{VS}}_{\mathrm{Air}}$$

In practice, for air, the value of C _Air is taken equal to 0.

Note that the above calculation is done for the 9 environmental impacts.

In step 304 is calculated for each environmental impact, the instantaneous value resulting from the transport of ferric chloride and air. This value is determined by the product of the ferric chloride flow rate D _28A multiplied by the environmental footprint k associated with the transport of one kilogram of ferric chloride multiplied by the number of n _km of kilometers traveled by ferric chloride. The value k is stored in the base 52 while the value n _km is entered from the means 40. For air, this impact is zero air being taken locally. So in the form: $${\mathrm{<figure-callout\; id="28"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{\mathrm{28}\mathrm{AT}}\mathrm{xkx}{\mathrm{not}}_{\mathrm{km}}\mathrm{+}{\mathrm{<figure-callout\; id="28"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{\mathrm{28}\mathrm{<figure-callout\; id="0"\; label="B\; xkx"\; filenames="imgf0003.png"\; state="\{\{state\}\}">B\; </figure-callout>}}\mathrm{xkx}\mathrm{0}$$

In step 306 is calculated the instantaneous value of each environmental impact resulting from the biogas discharge from the biogas flow rate D _32A measured by the sensor 32A and the stored _biogas environmental footprint C corresponding to the biogas discharge. This value is expressed as: $${\mathrm{<figure-callout\; id="32"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{\mathrm{32}\mathrm{AT}}x{\mathrm{VS}}_{\mathrm{biogas}}$$

In step 308 is calculated the influence on each environmental impact of the transport of discharges by the product of the flow rate D _32A measured by the sensor 32A, the environmental footprint k and the number of kilometers traveled m _km in the form. $${\mathrm{<figure-callout\; id="32"\; label="D"\; filenames="imgf0001.png"\; state="\{\{state\}\}">D</figure-callout>}}_{\mathrm{32}\mathrm{AT}}\mathrm{xkx}{\mathrm{m}}_{\mathrm{km}}$$

In step 310 is calculated the value of the environmental impact resulting from the energy consumed from the product of the measured flow rates D _38A and D _38B by the sensors 38A and 38B respectively multiplied by the environmental imprints C _E and C _GN on each corresponding environmental impact as stored in the base 52 in the form. $${\mathrm{D}}_{\mathrm{38}\mathrm{AT}}x{\mathrm{VS}}_{\mathrm{E}}\mathrm{+}{\mathrm{D}}_{\mathrm{38}\mathrm{B}}x{\mathrm{VS}}_{\mathrm{GN}}$$

In step 312, the different components of each environmental impact calculated in steps 302 to 310 are summed to each other.

It is understood that with such an installation, the environmental impacts are each calculated from instantaneous values measured from sensors present on the installation. Thus, the cumulative values of the environmental impacts are obtained by summation of elementary environmental impacts each calculated from the instantaneous environmental impacts multiplied by the sampling period of the sensors. Thus, very precise values of the different environmental impacts can be obtained without resorting to a complex simulation that must be modified during the life of the station.

On the figure 5 is illustrated a histogram showing for an environmental impact monthly forecasts in white and the values made by the hatched station.

Claims (4)

Water treatment plant (10) comprising: at least one water treatment reactor (16, 18, 20, 22),
characterized in that it comprises: sensors (28) for instantaneous measurement of the input of substances introduced; sensors (32) for instantaneous measurement of discharges of rejected substances; sensors (38A, 38B) for instantaneous measurement of the energy consumption of the reactor; - a database of environmental footprints (52) containing the elementary environmental footprints of each substance added, each substance released, each measured energy consumption, on at least one determined environmental impact; means (50) for continuously calculating the or each instantaneous environmental impact determined from: - measured values of the input of substances and releases of substances released and instantaneous measurements of energy consumption; - elementary environmental footprints for each substance added, each substance released and each energy consumption measured on the or each specific environmental impact; and means (56) for making available the instantaneous or calculated environmental impact. Water treatment plant (10) according to claim 1, characterized in that : - the environmental footprint database (52) contains the elementary environmental footprints resulting from the transport of each substance, each substance released, each energy consumed, on at least one specific environmental impact; means (40) for recording the distance traveled by each substance supplied, each substance rejected, each measured energy consumption; and - Calculation means (50) are capable of continuously calculating the or each instantaneous environmental impact determined from: - entered values of the distances traveled by the substances supplied, the substances discharged and the energies consumed; and - elementary environmental footprints resulting from the transport of each substance supplied, each substance released and each energy consumed, on at least one specific environmental impact. Water treatment plant (10) according to one of the preceding claims, characterized in that it comprises: means (50) for calculating the or each cumulative environmental impact from the instantaneous environmental impacts calculated and the periods between the calculations of the instantaneous environmental impacts; and means (56) for making available the calculated cumulative environmental impact or impact. Water treatment plant (10) according to claim 3, characterized in that it comprises: means (40) for capturing accumulated distances traveled by the personnel operating the station; - the environmental footprints database (52) contains the elementary environmental footprints resulting from the transportation of personnel operating the station on the or each specific environmental impact; the means (50) for calculating the or each cumulative environmental impact are capable of performing the calculation of the or each cumulative environmental impact in addition from: - values entered of accumulated distances traveled by the personnel operating the station; and - basic environmental footprints for each distance traveled by the personnel operating the station on the or each specific environmental impact.

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