Patent FR-2989968-A1 (FR)
Title: Device, useful for treating sewage in on-board ship, comprises unit for controlling electrolysis time in function of concentration of bacteria and undesirable compounds of water to maintain a residual chlorine concentration in the mixture
Inventor: COMBES JEAN MARC
IPC: C02F1/461
Filed: 2012-04-30
Abstract: The device comprises a tank (1) containing a liquid comprising a mixture of waste water to be treated and a certain volume of sea water, a suction pump (2) of the liquid contained in the reservoir, an electrolyzer (6) having an input and an output, and a processing circuit of the liquid by electrolysis. The circuit comprises an intake conduit of the liquid in the electrolyzer connecting the pump at the inlet of the electrolyzer, a outlet conduit (10) of the electrolyzer, and a discharge line (8) for discharging the treated liquid towards the outside. The device comprises a tank (1) containing a liquid comprising a mixture of waste water to be treated and a certain volume of sea water, a suction pump (2) of the liquid contained in the reservoir, an electrolyzer (6) having an input and an output, and a processing circuit of the liquid by electrolysis. The circuit comprises an intake conduit of the liquid in the electrolyzer connecting the pump at the inlet of the electrolyzer, a outlet conduit (10) of the electrolyzer, and a discharge line (8) for discharging the treated liquid towards the outside. The device further comprises: a unit for controlling an electrolysis time in function of a concentration of bacteria and other undesirable compounds of water to be treated so as to maintain a residual chlorine concentration in the treated mixture below a threshold value; a recirculation line connected by a first liquid three-way valve to the outlet conduit opening into the electrolyzer and the container to allow a loop circulation of the liquid between the reservoir, the pump and the electrolyzer before discharging it to the outside; a circuit for circulation of liquid in opposite direction for its discharge via the discharge line in the electrolyzer; a drain pipe of sea water including an internal portion arranged within the container, where the portion is equipped with openings regularly distributed along its thickness to allow the sea water supply in the form of jet into the container; and a drain pipe of the waste water including an internal portion towards a basic wall of the container to direct water to be treated towards the bottom of the container. The circulation circuit comprises: a conduit for intaking the liquid firstly through the outlet of the electrolyzer connected at an end to the intake conduit and secondly through the outlet conduit of the electrolyzer and the recirculation line by the first three-way valve; the outlet conduit of the electrolyzer to control the input of the electrolyzer; and the discharge line for discharging the liquid towards the outside, where the discharge line is connected to the input of the electrolyzer by a second three-way valve. The pump is placed inside the container. The electrolyzer is placed on a lateral wall of the container. The pump is macerator type pump. The container includes a partition equipped with a passage window near the drain pipe of waste water. The pump is placed on a side of the partition opposed to the drain pipe of waste water. The partition stores the largest particles contained in waste water in a compartment distinct from a compartment containing the pump. An independent claim is included for a method for treatment waste water in an on-board ship.