7 results about "Dead end filtration" patented technology

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.

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 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 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.