Method of operating and monitoring a group of filter membrane modules, and a group of modules implementing the method
First Claim
1. A method of operating and monitoring a group of filter membrane modules connected in parallel with the modules being backwashed periodically, wherein:
- raw water to be treated is injected into the group of modules at a regulated pressure and the outlet pressure of the premeate (filtered water) is regulated to a value that is lower than that of the inlet pressure, but nevertheless sufficient to enable backwashing operations;
the group of modules is provided with a water meter on the raw water inlet duct and with three pressure sensors, a first on the raw water inlet, a second on the permeate outlet, and a third on the backwashing circuit, the meter and the sensors delivering signals to a controller;
the modules are backwashed successively one after another, using the permeate from the other modules, thereby individualizing each module while it is being backwashed, thus making it possible with the water meter and the pressure sensors to determine the permeability in backwashing specific to the module thus individualized, and also determine the production permeability of the remaining modules; and
the permeability values obtained in this way are compared with ideal values, with threshold values, and/or with values from earlier cycles so that, depending on the diagnosis obtained, the periodicity of backwashing is modified, the group of modules is cleaned, or an operating anomaly is detected, thereby enabling it to be corrected.
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Accused Products
Abstract
A method of operating and monitoring a group of filter membrane modules connected in parallel and with the modules being periodically backwashed, in which:
raw water to be treated is injected at a regulated pressure and the permeate outlet pressure is regulated to less than the inlet pressure;
the group is provided with a water meter (60) on the raw water inlet duct and with three pressure sensors, one on the raw water inlet, one on the permeate outlet, and one on the backwash circuit, the meter and the sensors (100) delivering signals to a controller;
each module is backwashed in succession with permeate from the other modules, with each module being individualized at that moment, thereby making it possible with aid of the water meter and of the pressure sensors to determine the permeability (150) in backwashing specific to the module as individualized in this way, and also to determine the production permeability of the remainder of the modules; and
the values determined in this way are compared with reference values in order to modify the periodicity of backwashes and to proceed with module cleaning, and also to detect any anomaly in operation.
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Citations
12 Claims
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1. A method of operating and monitoring a group of filter membrane modules connected in parallel with the modules being backwashed periodically, wherein:
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raw water to be treated is injected into the group of modules at a regulated pressure and the outlet pressure of the premeate (filtered water) is regulated to a value that is lower than that of the inlet pressure, but nevertheless sufficient to enable backwashing operations; the group of modules is provided with a water meter on the raw water inlet duct and with three pressure sensors, a first on the raw water inlet, a second on the permeate outlet, and a third on the backwashing circuit, the meter and the sensors delivering signals to a controller; the modules are backwashed successively one after another, using the permeate from the other modules, thereby individualizing each module while it is being backwashed, thus making it possible with the water meter and the pressure sensors to determine the permeability in backwashing specific to the module thus individualized, and also determine the production permeability of the remaining modules; and the permeability values obtained in this way are compared with ideal values, with threshold values, and/or with values from earlier cycles so that, depending on the diagnosis obtained, the periodicity of backwashing is modified, the group of modules is cleaned, or an operating anomaly is detected, thereby enabling it to be corrected. - View Dependent Claims (2, 3, 4, 5)
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6. A water treatment installation comprising a plurality of filter membrane modules (M1, . . . , Mn) connected in parallel,
individual ducts (21, . . . , 28)for feeding said modules, said individual ducts branching from a first common duct (1: - 2) fitted with a water meter (C1), with a downstream pressure regulator (VR1), and with an inlet pressure sensor (P1),
means for conveying the permeate from each module to a second common duct (4) fitted with an outlet pressure sensor (P2) and with an upstream pressure regulator (VR2); a backwash circuit comprising a common backwash water feed duct (5) configured to feed each module (Mi) in succession with backwash water constituted by the permeate delivered by the other modules (-Mi), a valve (EV11) of the backwash water inlet duct (5i) configured to deliver said backwash water while the other valves (EV1n) of the other duct (5n) are closed, and an outlet duct (6i) for backwash water leading to a common drain duct (6); and
the common backwash water feed duct (5) is fitted with a pressure sensor (P3),means for computing the permeability at each module based on data from the pressure sensors and the water meter, means for comparing the permeability with specified reference values to determine when cleaning is necessary, and means to effect cleaning of the individual modules by automatically operating said valves so as to direct backwash from the other modules through each module in succession. - View Dependent Claims (7, 8, 9, 10, 11, 12)
- 2) fitted with a water meter (C1), with a downstream pressure regulator (VR1), and with an inlet pressure sensor (P1),
Specification