Patent FR-2945037-A1 (FR)
Title: Unit for treating raw water from capturing chambers, comprises a raw water tank with an overflow, a filtration tank containing a filtering element, a raw water storage tank with an overflow, a hydraulic control module, and a flow unit
Inventor: TISSELIN GUILLAUME
IPC: B01D24/00
Filed: 2009-04-30
Abstract: The unit for treating raw water (1) from capturing chambers, comprises a raw water tank with an overflow (2), a filtration tank (3) containing a filtering element hydraulically connected to the raw water tank through a flow adjusting gate ensuring a minimum time for contacting water with the filter element, a raw water storage tank (4) with an overflow (5) hydraulically connected to the filtration tank and to a network of water distribution, and a hydraulic control module for contacting water with the filter element associated with a unit for measuring water treated in the storage tank. The unit for treating raw water (1) from capturing chambers, comprises a raw water tank with an overflow (2), a filtration tank (3) containing a filtering element hydraulically connected to the raw water tank through a flow adjusting gate ensuring a minimum time for contacting water with the filter element, a raw water storage tank (4) with an overflow (5) hydraulically connected to the filtration tank and to a network of water distribution, a hydraulic control module for contacting water with the filter element associated with a unit for measuring water treated in the storage tank, a unit (6) for flowing treated water from filter tank to the storage tank at a point of filling located at a level above the overflow level of the tank, a unit for interrupting the flow of treated water from filter tank to the storage tank, a unit for measuring pH of treated water in upstream of the storage tank, and a unit for discharging non compliant treated water having a measured pH in upstream of a switching unit. The overflow level of the storage tank is located at a level lower than the overflow level of the raw water tank and in that the filling point of treated water in the storage tank is located between the overflow level of the storage tank and the level of overflow of the treated water tank. The flow pipe of treated water hydraulically connects the filter tank at the filling point of the storage tank from a low point of the filtration tank located near the bottom of the filtration tank. The bottom of the storage tank is located at a level below the bottom of the filtration tank. A system is arranged for injecting carbon dioxide in raw water. A tank is hydraulically connected to the raw water tank and the filtration tank for injecting carbon dioxide using an injection system. The flow control gate consists of a tubular part adapted to be traversed by the raw water flowing from the raw water tank to the filtration tank, an openable sealing unit comprising a pivoting valve in half disk shape rotating around the axis of symmetry of the tubular part, and a sealing wall partially closing a flow area in the tubular part so that the controlling of the angular position of rotating of the pivoting valve with respect to the sealing wall has the effect of changing the flow in the tubular part. The sealing unit comprises the pivoting valve and the sealing wall rotating around a transverse axis perpendicular to the axis of symmetry of the rotating valve for fully opening the flowing section of the tubular part partially closed by the sealing wall and in that an abutment prevents the opening of the flowing section in the direction of flow of raw water obtained from raw water tank. A solenoid valve is used in the pH measuring unit and placed between the filtered water outlet of the filtration tank and the point of measuring the pH. The solenoid valve is connected by a pipe to the raw water tank, and allows for introducing a low quantity of raw water in the filtered water to obtain the measured pH value of = 9, when the measured pH reaches or exceeds a value of 9.