Patent ID: 9359998
Filing Date: 2016-06-07
CPC Classification: B01D,C02F,F04B,F04F,Y02A

Claim Text:
1. A liquid treatment apparatus comprising: a separation structure comprising a membrane, an inlet for receiving an inlet liquid, a first outlet for delivering a first liquid which has not passed through the membrane, and a second outlet for delivering a second liquid which has passed through the membrane, a displacement pump comprising a rotational pump element, the displacement pump being adapted to supply an amount of inlet liquid to the separation structure proportional to the rotation of the pump element, and a pressure recovery unit comprising a rotational recovery element, the pressure recovery unit being adapted to drain an amount of first liquid from the separation structure proportional to the rotation of the recovery element, a drive structure driving and rotating the rotational pump element of the displacement pump and the rotational recovery element of the pressure recovery unit; wherein the drive structure is adapted to individually vary and synchronize a rotational speed (RPM) of the pump element and a rotational speed (RPM) of the recovery element based on a flow rate through the second outlet of the separation structure; wherein the displacement pump and the pressure recovery unit have different changes in efficiency for a change in the synchronized RPM of the pump element and RPM of the recovery element to enable control of a ratio between the first and second liquids by varying the synchronized RPM of the pump element and RPM of the recovery element.