14 results about "Dead end filtration" patented technology

The invention discloses a high-flux silicon carbide ceramic membrane filtering device, and belongs to the technical field of filtering equipment, the high-flux silicon carbide ceramic membrane filtering device comprises a guide cylinder unit and a rotating membrane cylinder unit, a dead end filtering station and a cross flow filtering station are arranged in the guide cylinder unit, and the rotating membrane cylinder unit is rotatably mounted in the guide cylinder unit; the two groups of silicon carbide ceramic membrane cylinders are rotatably mounted in the rotating membrane cylinder unit, pollutants on the surface of a membrane layer are cleaned by circularly switching the working states of the ceramic membrane cylinders, and the two groups of silicon carbide ceramic membranes can be always kept in a rotating state in the filtering process, so that the pollutants are uniformly distributed on the membrane layer; the deep deposition of pollutants in a specific area during dead-end filtration is avoided, and meanwhile, the two groups of membrane bodies are circularly switched between a dead-end filtration station and a cross-flow filtration station, so that the formation of a filter cake layer is effectively reduced, and the device is ensured to be in a high-membrane flux state.

A high processing capacity filtering device and method, by from the water distribution branch pipe derived raw water impact water distribution disc, water distribution disc makes the raw water direction from vertical downward changes to oblique upward, the pollutants carried in the oblique upward raw water are enriched in the upper space of the filter tank body, and the pollutants are allowed to be discharged through the cross-flow filter valve via the cross-flow filter pipeline; after the oblique upward raw water falls, the filtered layer inside the filter tank body is filtered, and then the filtered water is discharged from the water outlet pipeline. The invention changes the dead-end filtration concept of the traditional mechanical filtration to the cross-flow filtration concept, and through the water distribution structure, the pollutants originally accumulated on the upper surface of the filter layer are transferred to the upper space of the filter layer, and then the cross-flow filtration is discharged, so that the pollutants in the upper space of the filter layer are not excessively enriched. The invention greatly improves the processing capacity of the mechanical filter, reduces the required number of mechanical filters, reduces the land occupation space in water treatment pretreatment; safe to use, easy to operate and convenient to maintain.

This invention utilizes a membrane separation unit comprising an oil-water separation membrane to separate oily wastewater. The membrane separation unit includes a first metal mesh, a hollow oil-water separation chamber open at both ends, an oil-water separation membrane, and a second metal mesh. One end of the oil-water separation chamber is connected to the first metal mesh, and the other end is connected to one side of the oil-water separation membrane. The other side of the oil-water separation membrane is connected to the second metal mesh. The first and second metal meshes are arranged in parallel and are respectively connected to two electrodes of a pulsed power supply to generate an external pulsed electric field. This oil-water separation method, based on dead-end filtration or cross-flow filtration using an oil-water separation membrane, effectively prevents oil droplets from accumulating, clogging, and adhering to the separation membrane during the separation process through the combined effects of dielectric electrophoresis, electrophoresis, and bubble-mediated separation within the membrane separation unit. It exhibits excellent membrane fouling inhibition capabilities, thereby improving the oil-water separation effect of oily wastewater.

The present invention relates to the method for efficient removal of phenolic compounds from wastewater generated from petroleum industry. The method is two-step process. The first step is a pre-treatment process which operates through adsorption-based separation using granular activated carbon. The wastewater in this step is allowed to pass through a column packed with granular activated carbon. In the second step, the pretreated wastewater is subjected to membrane-based treatment. The present invention also relates to the design of a special membrane for effective removal of phenolic compounds from waste water. The membrane formulation includes polysulfone as the main polymeric matrix and carbon dots coated powdered activated carbon as the additive which acts as the active agent for the removal of phenolic compounds. The membranes are designed in two different types, viz., (i) flat sheet and (ii) hollow fiber. The membrane-based separation using the flat sheet membranes can be done with the help of a dead-end filtration set up. In case of hollow fiber membranes, a cylindrical membrane module with a large number of hollow fiber membranes is designed. The membranes are reusable with excellent separation efficiency. The membrane module has proper feed inlet, outlet for permeates and outlet for retentates. This present invention provides removal of ~99% phenolic compounds from petroleum industry wastewater.

The present invention discloses a high-throughput silicon carbide ceramic membrane filtration device, which belongs to the technical field of filtration equipment, including a guide tube unit and a rotating membrane tube unit. The guide tube unit is provided with a dead-end filtration station and a cross-flow filtration station. The rotating membrane tube unit is rotatably installed in the guide tube unit, and two groups of silicon carbide ceramic membrane cylinders are rotatably installed in the rotating membrane tube unit. The working state of the ceramic membrane cylinders is cyclically switched to clean the pollutants on the surface of the membrane layer. The present invention can enable the two groups of silicon carbide ceramic membranes to always maintain a rotating state during the filtration process, so that the pollutants are evenly distributed on the membrane layer, avoiding the deep deposition of pollutants in a specific area during dead-end filtration, and at the same time enable the two groups of membrane bodies to cyclically switch between the dead-end filtration station and the cross-flow filtration station, effectively reducing the formation of the filter cake layer, and ensuring that the device is in a high membrane flux state.

The invention provides a continuous filtration and concentration discharge system and method, and belongs to the technical field of separation. The system comprises a filter, a membrane separation assembly and a sedimentation flow guide pipe; the filter is provided with a feed port and a discharge port, and the discharge port is connected with a concentrated phase collecting tank through a pipeline; a clear liquid discharge pipe is arranged at the side part of the filter; the clear liquid side of the membrane separation assembly is communicated with a clear liquid discharge pipe; the sedimentation guide pipe is positioned in the filter; the top end of the sedimentation flow guide pipe is connected to the position of the feeding hole, and the bottom end of the sedimentation flow guide pipe downwards extends below the bottom of the membrane separation assembly; solid-liquid mixed feed liquid moves to the position below the membrane separation assembly after passing through the feed port and the sedimentation flow guide pipe, and the feed liquid can upwards immerse the membrane separation assembly so as to reduce the solid content of the feed liquid around the membrane separation assembly; compared with an existing dead-end filtering mode, the dead-end filtering mode can be continuously operated; compared with an existing cross-flow filtering mode, the filtering efficiency of the dead-end filtering mode is higher than that of the cross-flow filtering mode.

A bi-directional filter includes an outer housing and a filter assembly unit. The outer housing is provided with one inlet for contaminated fluid and at least one outlet. The filter assembly unit includes at least one separation void for contaminated fluid. The filter assembly unit, at least one separation void, and the outer housing provide an outer dead end and an inner dead end within the bi-directional filter. The filter assembly unit is connected to a drive unit through a shaft.

The invention provides a preparation method and application of an antibacterial and anti-pollution zeolite imidazate framework (ZIF-8) modified polyvinylidene fluoride (PVDF) composite membrane (ZIF-8 / PVDF), and relates to the technical field of manufacturing of separation membranes for water treatment. And introducing ZIF-8 into the PVDF casting membrane solution by adopting a phase inversion method to prepare the mixed matrix composite membrane. The antibacterial and anti-pollution performance of the composite membrane is researched by adopting antibacterial experiments and dead end filtration, and the result shows that the modified composite membrane has excellent bactericidal performance and good anti-pollution behavior.

The invention belongs to the technical field of ion separation, and particularly relates to a nanofiltration and electric field coupled ion separation device, and a dead end filtering device comprises a nanofiltration membrane used for preliminarily filtering large-particle impurities in a solution; the upper and lower porous electrode plates are respectively positioned above and below the nanofiltration membrane and are respectively connected with a positive electrode and a negative electrode of a power supply, and the power supply applies an electric field on the surfaces of the porous electrode plates; and an air compressor is arranged above the dead-end filtering device and is used for providing pressure for the dead-end filtering device so as to push a solution to pass through the dead-end filtering device and the porous electrode plate. The nanofiltration membrane provided by the invention has the capability of selectively separating ions, and the electric field device further enhances the separation effect and improves the separation efficiency and selectivity. The device is simple in structure and convenient to operate, and can effectively solve the problems of low efficiency, poor selectivity and the like in a traditional separation method.

The problem addressed is to provide a method for producing PHA that can sufficiently remove impurities while reducing the amount of wastewater in a purification process and can realize a practical filtration rate. The problem is solved by a method for producing PHA, the method comprising: a centrifugal separation step in which a PHA aqueous suspension (1) is centrifuged to obtain a PHA aqueous suspension (2) having a predetermined protein content; and a filtration step in which the PHA aqueous suspension (2), which has been adjusted to a pH of from more than 5.5 to 11.0, is subjected to dead end filtration.

The present invention discloses a tank-type ceramic membrane filtration device, comprising a tank body, a water inlet pipe, a vent pipe, a multifunctional pipe, a water inlet distribution pipe, a separation wing plate, a ceramic membrane assembly, a ceramic membrane assembly water production pipe, an air flushing pipe, an upper drainage pipe, and a water production pipe. The structural design of the present invention can meet different operational needs, and can adopt a pressure filtration mode or an immersion suction filtration mode; can adopt a cross-flow filtration mode or a dead-end filtration mode; can adopt a ceramic membrane assembly direct filtration mode, ozone oxidation or a series mode of powdered activated carbon circulation pretreatment and ceramic membrane filtration; can adopt a conventional air-water flushing mode or a gas pressure explosion washing mode. Compared with conventional ceramic membrane filtration equipment, the present invention highly integrates the functions of ozone oxidation, powdered activated carbon circulation and ceramic membrane filtration, and has high operational flexibility; the operating mode and backwashing mode can be adjusted according to the raw water quality, has strong adaptability to water quality, and occupies a small area.

The invention provides a continuous separation and concentration device and method for an alkyl oxalate catalyst, and belongs to the technical field of solid-liquid separation. The continuous separation and concentration device comprises a shell, a cyclone separation assembly and a dead end filtering assembly; the interior of the shell is divided into a gas phase space, a liquid phase space and a settling space from top to bottom; the cyclone separation assembly is arranged in the liquid phase space of the shell; feed liquid in the cyclone separation assembly enters the liquid phase space from the top, and a catalyst in the cyclone separation assembly enters the settling space from the bottom; the dead end filtering assembly is arranged in the liquid phase space and located around the cyclone separation assembly or located above the cyclone separation assembly; wherein the feeding amount of the cyclone separation assembly is equal to the sum of the discharge amount of filtered clear liquid of secondary filtration and the discharge amount of a catalyst, so that the liquid level in the liquid phase space is kept stable, and the continuous separation and concentration process is realized; by means of the device, secondary separation is conducted on mixed liquid, the continuous separation and concentration process can be achieved, and precise extraction of oxalic acid alkyl ester can be achieved.

The invention discloses a method for synthesizing hydrogen peroxide by electrofiltration of a tip nitrogen-doped carbon nanotube membrane, which comprises the following steps: selecting the tip nitrogen-doped carbon nanotube membrane as a cathode and a porous metal plate as an anode, and relatively fixing the cathode and the anode in an electrofiltration device; adding an electrolyte into the electric filtration device, wherein the electrolyte is an oxygen-containing solution; connecting the cathode and the anode with an external electric field, and enabling the oxygen-containing solution to sequentially pass through the anode and the cathode under the action of the external electric field by adopting a dead end filtering mode to prepare hydrogen peroxide; the flow velocity of the oxygen-containing solution is 0.5 mL / min to 8 mL / min, and the voltage value of the external electric field is 1.5 V to 3.5 V. A C-N structure in the tip nitrogen-doped carbon nanotube film can stably catalyze a two-electron oxygen reduction reaction, the generation rate of hydrogen peroxide is increased, no metal component is needed in preparation, the problems of metal loss and secondary pollution are avoided, the mass transfer efficiency of dissolved oxygen in an oxygen-containing solution and effective contact between solution oxygen and a catalytic interface are further improved, and the catalytic performance of the nitrogen-doped carbon nanotube film is improved. The diffusion limitation of a traditional flow-through electrode is broken through.

The present disclosure relates to a filtration device comprising a plurality of hollow fiber membranes. In particular, a filtration device comprising a plurality of microporous hollow fiber membranes having a large inner diameter and a thin wall is provided. The filtration device can be used for sterile dead-end filtration of liquids destined for infusion into a patient. Processes for production of the filtration device are also provided.