Dehydrator systems having a core dehydrator and a mixing unit are described herein and methods of using the same. The core dehydrator comprises a turbulent flow mixing compartment the turbulent flow mixing compartment with plate openings having a turbulent flow transition zone where linear speed of fluid flow is reduced, a clarifying sediment chamber, where fluid flow is substantially laminar) comprising a plurality of small deflector plaques and a plurality of large deflector plaques and a flocculation pipe. In the turbulent flow transition zone, fluid flow transitions from turbulent flow to laminar flow. The mixing unit comprises a plurality of vertical flocculators. The mixing unit further comprises a rapid mixing manifold. The rapid mixing manifold contains drilling fluids and flocculant polymers.

There is provided a filtration system comprising a reaction and separation apparatus (2) for processing a solid-liquid mixture (4) to separate solids from liquid, the reaction and separation apparatus (2) comprising: a tank (6) comprising an inlet (8) and an outlet (10), the inlet (8) configured for receiving the solid-liquid mixture (4) into the tank (6), the outlet (10) configured for permitting liquid to exit the tank (6); and a sedimentation device (16) including a liquid conduit (18), the liquid conduit (18) having a first end (20) and a second end (22), the first end (20) configured to be in liquid communication with the outlet (10), the second end (22) configured for dispensing liquid from the liquid conduit (18), wherein the second end (22) is positioned higher than the first end (20) so that the liquid conduit (18) extends from the first end (20) to the second end (22) along a vertical axis or along an inclined axis relative to the horizontal, wherein the filtration system further comprises a preparatory filter (642) configured to, in use, receive an inflow liquid (644) from an external source and separate the inflow liquid (644) into the solid-liquid mixture (4) and a filtered liquid (646), wherein the preparatory filter (642) is configured to dispense the solid-liquid mixture (4) into the tank (6) via the inlet (8).

There is provided a filtration system comprising a reaction and separation apparatus (2) for processing a solid-liquid mixture (4) to separate solids from liquid, the reaction and separation apparatus (2) comprising: a tank (6) comprising an inlet (8) and an outlet (10), the inlet (8) configured for receiving the solid-liquid mixture (4) into the tank (6), the outlet (10) configured for permitting liquid to exit the tank (6); and a sedimentation device (16) including a liquid conduit (18), the liquid conduit (18) having a first end (20) and a second end (22), the first end (20) configured to be in liquid communication with the outlet (10), the second end (22) configured for dispensing liquid from the liquid conduit (18), wherein the second end (22) is positioned higher than the first end (20) so that the liquid conduit (18) extends from the first end (20) to the second end (22) along a vertical axis or along an inclined axis relative to the horizontal, wherein the filtration system further comprises a preparatory filter (642) configured to, in use, receive an inflow liquid (644) from an external source and separate the inflow liquid (644) into the solid-liquid mixture (4) and a filtered liquid (646), wherein the preparatory filter (642) is configured to dispense the solid-liquid mixture (4) into the tank (6) via the inlet (8).

The method for treating wastewater includes a first flocculation-and-sedimentation process and a second flocculation-and-sedimentation process, wherein the first flocculation-and-sedimentation process include: passing wastewater through a first flocculation reaction tank; passing the first treated water through a third flocculation reaction tank; passing the third treated water through a fourth flocculation reaction tank; and passing the fourth treated water through a first sedimentation tank to generate fifth treated water and sludge, and the second flocculation-and-sedimentation process include: passing the fifth treated water through a fifth flocculation reaction tank to generate sixth treated water; passing the sixth treated water through a sixth flocculation reaction tank to generate sixth treated water; passing the sixth treated water through a seventh flocculation reaction tank to generate eighth treated water; and passing the eighth treated water through a second sedimentation tank to generate ninth treated water and sludge.

The method for treating wastewater includes a first flocculation-and-sedimentation process and a second flocculation-and-sedimentation process, wherein the first flocculation-and-sedimentation process include: passing wastewater through a first flocculation reaction tank; passing the first treated water through a third flocculation reaction tank; passing the third treated water through a fourth flocculation reaction tank; and passing the fourth treated water through a first sedimentation tank to generate fifth treated water and sludge, and the second flocculation-and-sedimentation process include: passing the fifth treated water through a fifth flocculation reaction tank to generate sixth treated water; passing the sixth treated water through a sixth flocculation reaction tank to generate sixth treated water; passing the sixth treated water through a seventh flocculation reaction tank to generate eighth treated water; and passing the eighth treated water through a second sedimentation tank to generate ninth treated water and sludge.

An aim of the invention is to provide a bioreactor and a waste water treatment method that employs this tank, whereby anaerobic and aerobic microorganism treatment can be continuously carried out, even when the volume of the bioreactor is large, and whereby installation costs can be minimized. The invention comprises an outer tank (2), a cylindrical inner tank (3) disposed inside this outer tank and having openings above and below, a circulation rate control device (4) for controlling the circulation rate of water to be treated in the bioreactor, the circulation rate control device (4) being provided at an upper part of this cylindrical inner tank, a cylindrical control plate (5) for bringing about sedimentation of sludge, the cylindrical control plate (5) being provided at the outer circumference of an upper part of the cylindrical inner tank, a treated-water quality measurement device (6) that is provided outside and inside of the cylindrical inner tank, a waste water supply opening (10) that is provided in the circulation pathway of the water to be treated circulating through the outer tank and inner tank, a treated water discharge opening (11) that is provided in an upper part of the outer tank.

An aim of the invention is to provide a bioreactor and a waste water treatment method that employs this tank, whereby anaerobic and aerobic microorganism treatment can be continuously carried out, even when the volume of the bioreactor is large, and whereby installation costs can be minimized. The invention comprises an outer tank (2), a cylindrical inner tank (3) disposed inside this outer tank and having openings above and below, a circulation rate control device (4) for controlling the circulation rate of water to be treated in the bioreactor, the circulation rate control device (4) being provided at an upper part of this cylindrical inner tank, a cylindrical control plate (5) for bringing about sedimentation of sludge, the cylindrical control plate (5) being provided at the outer circumference of an upper part of the cylindrical inner tank, a treated-water quality measurement device (6) that is provided outside and inside of the cylindrical inner tank, a waste water supply opening (10) that is provided in the circulation pathway of the water to be treated circulating through the outer tank and inner tank, a treated water discharge opening (11) that is provided in an upper part of the outer tank.

Treating and conditioning liquid sludge and a solidified sludge cake obtained thereby are disclosed. A first emulsion of sludge is formed in an in-line container fed at a first flow rate Q owing to the impact of the sludge with air injected into the container at a rate Q, where Q>5Q, in a first region which has a small volume of less than 0.05 m3. The first emulsion is then transferred into a second region of the container extending over a first length, and is then discharged via a component which generates a head loss in a chamber extending over a second length. A flocculant is injected in order to obtain a second coagulated emulsion, which is at least partially degasified. The matter in suspension in the second emulsion obtained in this way is then filtered or decanted.

Treating and conditioning liquid sludge and a solidified sludge cake obtained thereby are disclosed. A first emulsion of sludge is formed in an in-line container fed at a first flow rate Q owing to the impact of the sludge with air injected into the container at a rate Q, where Q>5Q, in a first region which has a small volume of less than 0.05 m3. The first emulsion is then transferred into a second region of the container extending over a first length, and is then discharged via a component which generates a head loss in a chamber extending over a second length. A flocculant is injected in order to obtain a second coagulated emulsion, which is at least partially degasified. The matter in suspension in the second emulsion obtained in this way is then filtered or decanted.

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.