66 results about "Dead end filtration" patented technology

The invention relates to a preparation method of a polyelectrolyte self-assembled composite nonafiltration membrane based on coordination. The preparation method comprises the following steps of: respectively preparing a polyanion electrolyte solution containing transition metal ions and a polycation electrolyte solution easy to form a complex together with the transition metal ions; enabling the polyanion electrolyte solution or the polycation electrolyte solution to flow through the surface of a base membrane in a cross flow way at the pressure of 0-0.5MPa, and self-assembling on the surface of the base membrane to form a polyelectrolyte lamellar membrane; washing surplus polyelectrolyte solution on the surface of the membrane by water; enabling the polyion electrolyte solution with charges opposite to the charges of the upper-layer polyion electrolyte solution to flow through the surface of the base membrane in a cross flow way, and enabling polycation electrolyte and polyanion electrolyte to undergo self-assembled reaction on the surface of the membrane through the coordination of the metal ions to form a polyelectrolyte composite membrane; washing surplus polyelectrolyte solution on the surface of the membrane by using water; and repeating the operations to enable polyelectrolyte with opposite charges to be alternatively deposited and assembled on the surface of the base membrane to obtain the polyelectrolyte self-assembled composite nonafiltration membrane. A cross flow flowing way is adopted in the method, and thus, the phenomenon that gel is easy to form in a dead-end filtration way is avoided, and a product is high in stability, strong in impact resistance and swelling resistance, simple in process, low in preparation cost and friendly to production environment...

The invention discloses a method for removing smelly substances in water, which comprises the following steps: 1. preparing an inorganic nano catalyst, an organic high-polymer basal film material, additives, a solvent and the like into a film casting solution at certain temperature, and preparing a flat or hollow-fiber or tubular inorganic-organic hybrid photocatalytic separation film; and 2. putting the inorganic-organic hybrid photocatalytic separation film on a film filter unit, and filtering smelly-substance-containing water to be treated in a dead end filtering or cross-flow filtering mode under the conditions of a proper light source. The photocatalytic unit and the film separation unit which are mutually independent are organically fused into one unit for operation, and thus, the invention can simultaneously have the advantages of both photocatalysis and film separation. The method disclosed by the invention has the advantages of simple technique, no need of reagents, high operation reliability, compact equipment and easy automatic control; and the method can effectively remove smelly substances in water, reduce the film pollution, prolong the service life of the film, and lower the technological cost.

The present invention relates an antifouling electrocatalytic composite membrane and a membrane reactor. The electrocatalytic composite membrane (3) consists of a substrate and a catalytic coating, wherein the substrate is selected from a conductive substrate or a nonconductive substrate coated with a conductive coating, and the substrate is a porous support having supporting, conducting and separating functions. The catalytic coating is supported or coated on the surface and in the pores of the conductive substrate or the conductive coating so as to increase the electrocatalytic activity of the substrate. The membrane reactor provides a trans-membrane pressure as the membrane separation power generated by a pump (7) and dead-end filtration or cross-flow filtration is applied, then the feed liquid permeates through the membrane from one side to the other to achieve the separation of the liquid; meanwhile, an electrocatalytic composite membrane (3) as anode and an auxiliary electrode (4) as cathode are connected to a power supply (1) separately by conducting wires (2) so that an electrolysis apparatus is formed. The electrocatalytic composite membrane (3) has a self-cleaning function and achieves the pollution-free operation during the membrane separation.

The present subject matter provides a method for operating a dishwasher appliance. The method includes finely filtering wash fluid with a fine filtration medium via cross-flow filtration and coarsely filtering wash fluid with a coarse filtration medium via dead-end filtration. The finely filtered wash fluid is directed to a spray assembly of the dishwasher appliance. A related dishwasher appliance is also provided.

The invention discloses a secondary water supply water tank with dead end filtration and self-cleaning functions and a secondary water supply method. The water tank comprises a water tank body and ischaracterized in that a baffle is vertically arranged in the water tank body, an overflow channel is formed between the top end of the baffle and the top wall of the water tank body, the baffle divides the water tank body from front to back into a first water tank and a second water tank, the first water tank is connected with a municipal water pipeline, a water inlet valve is arranged on the municipal water pipeline, a filtering device is arranged in the first water tank, water enters from the side surface of the filtering device, is filtered and flows out from the bottom, the filtering device communicates with the second water tank through a bottom connecting pipeline, a blow-off pipeline is arranged at the bottom end of the first water tank, and a liquid level detection mechanism for controlling the opening and closing of a water inlet valve of the first water tank is arranged in the second water tank. The secondary water supply water tank has the advantages that municipal tap wateris subjected to primary sedimentation, then is subjected to dead end filtration, secondary pollutants of water supply are removed, the filtering device can be automatically cleaned, and normal watersupply for households is guaranteed while self cleaning is carried out.

A filtration apparatus and filtration method can be used to reduce at least one contaminant (e.g., organic molecules, ions and / or biological microorganisms) in an aqueous fluid. The filtration apparatuses and methods of the invention can separate at least one contaminant from an aqueous fluid and / or oxidize at least one contaminant. In operation, an aqueous fluid is flowed through a filtration apparatus comprising a porous carbon nanotube filter material at an applied voltage. In some embodiments, the filtration apparatus described herein can be used for dead-end filtration. In some embodiments, the filtration apparatus described herein can be used for cross-over filtration.

The invention discloses a silicon carbide ceramic membrane filtering device, and belongs to the technical field of filtering equipment, wherein the silicon carbide ceramic membrane filtering device comprises a workbench, a filtering box, a first water pressure sensor, a second water pressure sensor, a silicon carbide ceramic membrane, impurity removal equipment and backflow equipment. When the device works, dead-end filtering is firstly carried out, if the pressure borne by the first water pressure sensor is far larger than that borne by the second water pressure sensor, it is indicated that impurities block the silicon carbide ceramic membrane after long-time filtering, and at the moment, the first water pressure sensor and the second water pressure sensor transmit signals to carry out cross-flow filtering; impurities in the silicon carbide ceramic membrane can be taken out through cross-flow filtration, then waste water carries the impurities to enter the impurity removal equipment, then the impurities are recycled by the impurity removal equipment, the remaining liquid returns to the filtering box again through the backflow equipment, and cleaning of the silicon carbide ceramic membrane is completed; and after cleaning of the silicon carbide ceramic membrane is completed, the whole device can continue to return to a dead-end filtering state, so that the filtering efficiency is improved.

The present invention relates an antifouling electrocatalytic composite membrane and a membrane reactor. The electrocatalytic composite membrane (3) consists of a substrate and a catalytic coating, wherein the substrate is selected from a conductive substrate or a nonconductive substrate coated with a conductive coating, and the substrate is a porous support having supporting, conducting and separating functions. The catalytic coating is supported or coated on the surface and in the pores of the conductive substrate or the conductive coating so as to increase the electrocatalytic activity of the substrate. The membrane reactor provides a trans-membrane pressure as the membrane separation power generated by a pump (7) and dead-end filtration or cross-flow filtration is applied, then the feed liquid permeates through the membrane from one side to the other to achieve the separation of the liquid; meanwhile, an electrocatalytic composite membrane (3) as anode and an auxiliary electrode (4) as cathode are connected to a power supply (1) separately by conducting wires (2) so that an electrolysis apparatus is formed. The electrocatalytic composite membrane (3) has a self-cleaning function and achieves the pollution-free operation during the membrane separation.

The invention relates to a detachable ultrafiltration filter, belonging to the technical field of water treatment equipment. The detachable ultrafiltration filter comprises an ultrafiltration tank, a membrane head and ultrafiltration membrane filaments, wherein the membrane head is fixedly arranged on the inner wall of the ultrafiltration tank, and divides the inner cavity of the ultrafiltration tank into a water producing cavity and a water inlet cavity, and the ultrafiltration membrane filaments are arranged in the water inlet cavity in a filamentous shape. The ultrafiltration membrane filament is of a structure shaped like a Chinese character hui in a disturbed state, so that the moveability of the membrane filaments is improved, the membrane surface scaling is reduced, and membrane filament sewage blocking is reduced. The detachable ultrafiltration filter adopts a dead-end filtration way, and a concentrated water discharge port is not arranged, so that the problem that the membrane operating pressure change is large can be avoided; a pressure control valve is not needed, so that the structure is simple and the operation is convenient.

The invention relates to a wastewater treatment method for organotin substances, in particular to a green and safe wastewater treatment method for tin methyl mercaptide. The preparation method of tin methyl mercaptide comprises the following steps: (1) tinning; (2) synthesis: adding the obtained methyl tin chloride aqueous solution into isooctyl thioglycolate, adding a second catalyst, Stir and react for 0.2-0.4 hours, then add lye and continue stirring until the pH value of the reaction system reaches 7-9, then heat up to 60-70°C for reaction; (3) washing with water; (4) distillation. The wastewater treatment process generated during the preparation process includes the filtration stage of the carrier-type membrane module and the degreasing stage of the activated carbon filter. The process is as follows: (1) The raw water tank is injected into the carrier-type membrane module through the circulating pump; It is carried out by cross-flow filtration; (3) The degreasing stage of activated carbon filter is carried out by dead-end filtration. The wastewater treatment method of the invention has the advantages of low cost and high treatment efficiency.

A static screen has a plurality of screening bodies and a plurality of aeration devices downstream of the screening bodies. Each aeration device is associated with a set of one or more of the screening bodies. Each aeration device may be a pulsing aerator. The pulsing aerators do not all release air at the same time. Each screening body works through periods of dead end filtration separated by backwashing events. The backwashing events comprise introducing a slug or pulse of air into the bottom of the screening body. Flow through the static screen continues at all times because the screening bodies are not all backwashed at the same time. The static screen may be used to remove trash from water flowing to an immersed membrane unit. Alternatively, the static screen may be used to provide primary wastewater treatment.