A system (1; 101) and a method for purification of oil, said system comprising:at least one feed tank (3) comprising oil to be purified;a separation aid dosing device(13);at least one basic sedimentation tank (21a, 21b) comprising at least one inlet (23a, 23b) connected to the feed tank (3) and to the separation aid dosing device (13) for receiving oil to be purified and separation aid, said at least one basic sedimentation tank (21a, 21b) further comprising at least one sludge phase outlet (41a, 41b) provided in a bottom part (37a, 37b) of the basic sedimentation tank and at least one oil phase outlet (39a, 39b);at least one advanced sedimentation tank (121) comprising at least one sludge phase inlet (122) connected to the at least one sludge phase outlet (41a, 41b) of the at least one basic sedimentation tank (21a, 21b), said advanced sedimentation tank (121) further comprising at least one sludge phase outlet (141; 141a, 141b) connected to a sludge tank (143) and at least one oil phase outlet (139a, 139b; 39), wherein said advanced sedimentation tank (121) further comprises at least one sensor (55; 55a, 55b, 55c) for detecting the presence of an oil phase or a sludge phase.

A method and a system for purification of contaminated oil. Said method comprises the steps of: providing contaminated oil and a separation aid in a tank (3); waiting for allowing a sludge phase comprising the separation aid together with impurities from the oil to settle in a bottom part (4) of the tank (3); reusing the sludge phase for purification of new contaminated oil.

A method and a system for purification of contaminated oil. Said method comprises the steps of: providing contaminated oil and a separation aid in a tank (3); waiting for allowing a sludge phase comprising the separation aid together with impurities from the oil to settle in a bottom part (4) of the tank (3); reusing the sludge phase for purification of new contaminated oil.

A means to exploit the Dean Vortices for dynamic filtering on a macro scale intended for application in utility and industrial processes is disclosed. This method relies on an apparatus of computed construction to optimize the centripetal force and minimize the effect of gravity on the separation and effectiveness of the Dean Vortices. The method is also supported by an apparatus of construction which results in an optimized elliptical flow channel that enhances the formation and persistence of the Dean Vortices.

A solids separator includes a housing having a fluid inlet, the fluid inlet oriented to induce helical flow of fluid entering the housing. A flow reversing device is disposed within the housing and is arranged to reverse a longitudinal direction of the helical flow within the housing. A fluid outlet is disposed at an upper end of the housing. The fluid outlet includes within its cross-section a radial center of the housing.

A solids separator includes a housing having a fluid inlet, the fluid inlet oriented to induce helical flow of fluid entering the housing. A flow reversing device is disposed within the housing and is arranged to reverse a longitudinal direction of the helical flow within the housing. A fluid outlet is disposed at an upper end of the housing. The fluid outlet includes within its cross-section a radial center of the housing.

A process for producing alumina trihydrate includes a digestion step, a separation step, and a precipitation step the separation step including: b1) pretreating a slurry from the digestion step by adding a flocculant to said slurry and mixing the flocculant and the slurry, b2) settling the resulting flocculated slurry in a gravity settler vessel, b3) determining a measured value representative of the concentration of solid particles in the resulting clarified liquor, b4) comparing the measured value with a predetermined threshold, b5) feeding said clarified liquor directly to the precipitation step, while the measured value is less than said predetermined threshold, and b6) redirecting said clarified liquor to the pre-treatment step b1), when the measured value is more than said predetermined threshold. An installation may be configured for operating said process.

A process for producing alumina trihydrate includes a digestion step, a separation step, and a precipitation step the separation step including: b1) pretreating a slurry from the digestion step by adding a flocculant to said slurry and mixing the flocculant and the slurry, b2) settling the resulting flocculated slurry in a gravity settler vessel, b3) determining a measured value representative of the concentration of solid particles in the resulting clarified liquor, b4) comparing the measured value with a predetermined threshold, b5) feeding said clarified liquor directly to the precipitation step, while the measured value is less than said predetermined threshold, and b6) redirecting said clarified liquor to the pre-treatment step b1), when the measured value is more than said predetermined threshold. An installation may be configured for operating said process.

One illustrative system disclosed herein includes a separator vessel that is adapted to separate solids particles from a flow of a multi-phase fluid, a differential pressure sensing system that is adapted to measure a differential pressure of a column of the multi-phase fluid in the separator vessel and a control system that is adapted to determine at least one of a level, volume or weight of the separated solids particles within the separator vessel based upon at least the measured differential pressure of the column of the multi-phase fluid in the separator vessel.

One illustrative system disclosed herein includes a separator vessel that is adapted to separate solids particles from a flow of a multi-phase fluid, a differential pressure sensing system that is adapted to measure a differential pressure of a column of the multi-phase fluid in the separator vessel and a control system that is adapted to determine at least one of a level, volume or weight of the separated solids particles within the separator vessel based upon at least the measured differential pressure of the column of the multi-phase fluid in the separator vessel.