A method of cleaning a membrane surface immersed in a liquid medium with a fluid flow, including the steps of providing a randomly generated intermittent or pulsed fluid flow along the membrane surface to dislodge fouling materials therefrom. A membrane module is also disclosed comprising a plurality of porous membranes (6) or a set of membrane modules (5) and a device (11) for providing a generally randomly generated, pulsed fluid flow such that, in use, said fluid flow moves past the surfaces of said membranes (6) to dislodge fouling materials therefrom.

Membrane cleaning with pulsed airlift pump

Filters used in the food and beverage industry can be cleaned by contacting the filters with a cyclic nitroxyl compound and a reoxidator or with a nitroxonium compound in a bromine-free process. The nitroxyl can be TEMPO or its 4-acetamido or 4-acetoxy derivative, and the nitroxonium compound can be the corresponding oxidised ion obtained by enzymatic or metal catalysed oxidation. The reoxidator may be a peracid, such as peracetic acid, persulphuric acid or permanganic acid, or a metal complex with a hydroperoxide.

Process for cleaning filters

A method of cleaning a porous polymeric membrane having a feed side and a permeate side including the steps of introducing a fluid containing a cleaning agent to the permeate side of a membrane allowing the cleaning agent to contact the permeate side of the membrane for a predetermined time, and contact the pores of the membrane, or introducing a fluid containing a cleaning agent to the feed side of a membrane; applying a transmembrane pressure to force the fluid containing the cleaning agent from the feed side to the permeate side of the membrane; allowing the cleaning agent to contact the permeate side of the membrane for a predetermined time, and contact the pores of the membrane. Preferably a concentration gradient between the feed side fluid and the lumen side fluid containing the cleaning agent causes cleaning agent to diffuse into the feed side fluid. Pressure may be applied to the fluid containing a cleaning agent to dislodge, where present, dissolved and undissolved solid from the membrane pores. The pressure may be applied in a pulsed fashion, and can be by way of compressed air at a pressure not more than the membrane's bubble point. The methods of the present invention may be preceded by, or followed with a backwash.

Chemical Clean For Membrane Filter

A wastewater treatment method (200) includes the steps of supplying a wastewater influent (206) having nutrients for a population of phototactic heterotrophic microorganisms (204) to an aerated bioreactor (202). At least a portion of the nutrients is converted into the phototactic heterotrophic microorganism population (204). The wastewater influent (206) and the phototactic heterotrophic microorganism population (204) together form a bioreactor effluent (210) that is transferred to a light clarifier (212). The bioreactor effluent (210) is concentrated in the light clarifier (212) to form a low- solids effluent (216) and a high-solids effluent (214). The concentration is performed by inducing the population of phototactic heterotrophic microorganisms (204) to phototactically self concentrate through exposure to a light having at least one of an intensity and a wavelength sufficient to cause the phototactic heterotrophic microorganism population (204) to migrate away from a source of the light.

System and method for treating wastewater via phototactic heterotrophic microorganism growth

Disclosed herein are apparatus and methods for filtering a fluid including a filter module assembly coupled to a manifold. The manifold may include a manifold inlet in fluid communication with a source of feed liquid, an outlet in fluid communication with header of the filter module assembly, a fluid passageway in fluid communication with the manifold inlet, a source of gas, and the outlet, a second fluid passageway in fluid communication with the header and the first fluid passageway and a second manifold outlet vertically displaced from the first manifold outlet and in fluid communication between the first fluid passageway and the second fluid passageway.

Fluid control manifold for membrane filtration system

PROBLEM TO BE SOLVED: To provide a chemical cleaning method for effectively cleaning a ceramic separating membrane. SOLUTION: The chemical cleaning method for compression transfer a chemical liquid in the direction reverse to the direction followed at the time of filtration in a permeating water flow path for a ceramic separating membrane is carried out at the interval of once in a week to once in a month. As the chemical cleaning is carried out at the time when scale, slime and the like adhere scarcely to the ceramic separating membrane, the chemical liquid can be permeated uniformly in all the portion of the ceramic separating membrane to clean the ceramic separating membrane evenly. COPYRIGHT: (C)1997,JPO

Chemical cleaning method for immersion type ceramic membrane separation device

PROBLEM TO BE SOLVED: To provide a cleaning method of diffuser, which can easily remove dry and deposited foreign matter by making a water to be flow backward into an air diffusion pipe. SOLUTION: In this diffuser, a gas for diffusion is jetted into the water to be treated by diffusion in a reaction tank 1 from a plurality of jet ports 3 at the bottom of the air diffusion pipe 2 immersed in the tank 1. After stopping diffusion, the water to be treated is made to flow backward into the air diffusion pipe 2 from a tip opening 4 of the air diffusion pipe 2 bent downward and each jet port 3. The influent water humidifies the foreign matter dry and deposited in the vicinity of each jet port 3. Then, diffusion is restarted, and the water to be treated in the air diffusion pipe 2 is discharged from the tip opening 4, and the humidified foreign matter is removed by the sweeping stream of the water to be treated.

Cleaning method of diffuser

PROBLEM TO BE SOLVED: To provide a ceramic membrane module in which a flow passage between the adjacent membrane elements can be prevented from being clogged. SOLUTION: An element assembly 13 for filtering the water to be treated is disposed in a casing 12. The assembly 13 is constituted of a plurality of slender straight and tubular ceramic-made membrane elements 16 which are arranged in the vertical direction and the lower ends of which are closed and a bundling plate 17 for bundling/fixing the elements 16 and supporting the upper ends of the bundled/fixed elements 16 in a cantilever method. The casing 12 has a supply port 25 for supplying the water to be treated, a filtrate discharging part 27 communicated with the internal flow passage of each of the elements 16 and a concentrated water discharging port 30 for discharging the concentrated water.

Ceramic membrane module

PROBLEM TO BE SOLVED: To prevent the property deterioration of a separation membrane due to back-washing with the use of an oxidizing agent by a method in which adherend on the membrane is oxidation-decomposed by sending an oxidizing agent solution to the filtrate channel of the membrane as opposed to a filtration process, and then a reducing agent solution is sent similarly to reduce and dissolve adherent oxide. SOLUTION: Chemical washing is done at appropriate washing intervals while back-washing by filtrate being done appropriately during filtration operation. In this process, a chemical injection pump is driven with a back-washing pump 20 stopped, and the oxidizing agent solution of a chemical tank 21 is injected into a back-washing water supply pipe 18 so that organic substances etc., adherent to a separation membrane are oxidation-decomposed by an oxidizing agent. In back-washing, oxide produced by the oxidizing agent such as manganese dioxide from manganese ion in raw water 7 is deposited, and the deposit is sent with the oxidizing agent solution and the filtrate to adhere to the surface of the membrane. A chemical injection pump 28 is driven appropriately to back-wash a chemical tank 23 with a reducing agent solution to reduce and dissolve the oxide. COPYRIGHT: (C)1997,JPO

Method for back-washing membrane separation apparatus

PROBLEM TO BE SOLVED: To provide a culturing method and apparatus for simultaneously realizing the water treatment of a waste water and the culture of a feed by treating the waste water discharged from a cultivation aquarium by using an artificially formed food cycle. SOLUTION: The waste water from the cultivation aquarium is introduced to an algae-culturing vessel 6 for culturing algae to treat the waste water from the cultivation aquarium by allowing the nitrogen and the phosphorus in the waste water from the cultivation aquarium to be taken in by the algae as nutrient, and the algae-culturing water is taken out to the exterior of the algae- culturing vessel 6 by subjecting the algae-culturing water to a solid-liquid separation by a membrane separating device 12. The resultant concentrated algae- culturing water is fed to a plankton-culturing vessel 8 to culture the plankton by using the algae as nutrient, and the plankton-culturing water is subjected to a membrane separating device 20 to carry out the solid-liquid separation and to concentrate the plankton-culturing water. The concentrated plankton- culturing water is dehydrated by a dehydrator 9, and the dehydrated plankton is fed to the cultivation aquarium 1 or taken out as a feed product to the outside of the system. COPYRIGHT: (C)2002,JPO

健吉崎

Papers

Chemical cleaning method for immersion type ceramic membrane separation device

Cleaning method of diffuser

Ceramic membrane module

Method for back-washing membrane separation apparatus

Culturing method and apparatus

健 吉崎

Papers

Chemical cleaning method for immersion type ceramic membrane separation device

Cleaning method of diffuser

Ceramic membrane module

Method for back-washing membrane separation apparatus

Culturing method and apparatus

健吉崎