Patent FR-2989368-A1 (FR)
Title: Treatment system used for recycling waste water in spetic tank, comprises macrophyte bed including drain of input of waste water located upstream of tank and outlet of purified water collected by drainage pipe located downstream from tank
Inventor: BONNOTTE DANIEL
IPC: C02F1/32
Filed: 2012-04-16
Abstract: The system comprises a horizontal macrophyte bed (3) including a drain of input (28) of waste water located upstream of a tank and followed by a distribution pipe of the waste water, and an outlet of purified water (29) collected by a drainage pipe located downstream from the tank. The macrophytes bed comprises macrophyte plants, aerobic bacteria and gravels containing anaerobes. The bacteria transform the molecules of pollutants contained in the waste water into assimilable molecules by the macrophyte plants. The macrophyte plants have a function to support the development of the bacteria. The system comprises a horizontal macrophyte bed (3) including a drain of input (28) of waste water located upstream of a tank and followed by a distribution pipe of the waste water, and an outlet of purified water (29) collected by a drainage pipe located downstream from the tank. The macrophytes bed comprises macrophytes plants, aerobic bacteria and gravels containing anaerobes. The bacteria transform the molecules of pollutants contained in the waste water into assimilable molecules by the macrophyte plants. The macrophyte plants have a function to support the development of the bacteria and to assimilate the assimilable molecules. The system further comprises: a glance unit in which the outlet of purified water emerges; a slow sand filter consisted of a coarse sand cushion and a fine sand cushion; a tank provided for collecting the treated water, covered with wood and equipped with an overflow (6) that evacuates the water when the tank is full; a rain water recovery unit connected to the sand filter; a booster whose power is supplied via a line terminated by a strainer plunged in the tank for collecting the treated water; and a recycling network connected with the network of recycled water that supplies water to a washing machine (24) and any other water supply point whose medical quality is in correspondence with the recycled water. The outlet is connected by a rotary sleeve to a siphon to adjust a level of the macrophytes bed in the tank and to vary the anaerobes and the aerobic bacteria. The sand filter is arranged in the glance unit having a height of 1-1.20 m, and comprises openings at two ends to allow the water to enter and to leave under the effect of gravity. A film passes the water and the air, and is arranged above a recovery pipe. The outlet is controlled by a solenoid valve controlled by a level controller placed in a basin for its opening and by a level controller placed in the basin for its closing. A lift pump goes through the water pipe that controls stop/start of the pump by the level controllers. An exit of the booster feeds a distribution network of recycled water. The network of recycled water is divided into different networks according to the destination. The networks are perfectly color identifiable and different from cold drinkable water supplies and medical warm water over all its length. A non-return valve is positioned at the exit of the booster to avoid return of the drinking water in the treatment system. The drinking water supply supplies the drinking water via the line by opening the solenoid valve by the level controllers. The recycled water network ensures the purity of water in correspondence with the use of the water. Another non-return valve is installed at an exit of an UV filter to avoid any return of water in the filter. The water filtered with the UV filter is of sufficient quality to feed a purified circuit (40).