48results about How to "Mitigation of membrane fouling" patented technology

Desalination methods that include carbonate compound precipitation are provided. In certain embodiments, feed water is subjected to carbonate compound precipitation conditions prior to desalination. In certain embodiments, desalination waste brine is subjected to carbonate compound precipitation conditions. In yet other embodiments, both feed water and waste brine are subjected to carbonate compound precipitation conditions. Aspects of embodiments of the invention include carbone dioxide sequestration. Embodiments of the invention further employ a precipitate product of the carbonate compound precipitation conditions as a building material, e.g., a cement. Also provided are systems configured for use in methods of the invention.

A process and apparatus is described for filtering water with immersed membranes. In a batch process, permeate is withdrawn while the flow of feed is reduced or stopped at the end of a permeation cycle. The water level is reduced to a level where a portion of the membranes are exposed to air before draining the tank. In this or another process, the level of liquid is reduced to correspond with an area of the membrane fibers having an accumulation of solids. Aeration is provided for a period of time with the liquid at this level to dislodge at least a portion of the solids from the membranes. In these or other processes, the tank is partially drained between cycles to deconcentrate the tank, aeration is provided during backwashing and intermittently while permeating, and/or retentate is withdrawn from the tank during a portion of a permeation step.

Filtration systems (40) utilize a pre-treatment method to cause scale formation to occur on particles (94) in the fluid stream (96) rather than on the filter surface and may also destroy microorganisms in the fluid stream. More specifically, but not limited to, a filtration device can be a filtration membrane, such as spiral wound filtration membrane (60), that utilizes an open feed spacer (80), such for example an embossed or printed pattern on the membrane, to create a thin feed spacer channel which replaces a conventional feed spacer mesh material. System (40) further utilizes a treatment device (54) to enable a pulsed power, magnetic, electro-magnetic, electro-static, or hydrodynamic fluid treatment scheme to condition particles in the fluid stream (96) such that scale forming elements precipitate (94) on to the particles in the fluid stream rather than on the filtration surfaces.

High flow, low-pressure ultrafiltration or microfiltration spiral wound membrane cartridges are used in filtration of liquid feedstocks having high suspended solids. Applications may utilize either vacuum or pumping for transmembrane drive pressure (TMP), and gas may optionally be bubbled up through the cartridges with certain feedstocks. Water permeate flux rates as high as 90 gallons per square foot per day (gfd) can be obtained at TMPs below 5 pounds per square inch. By locating each spiral wound cartridge in its own casing and supplying liquid feedstock to an open lower end of the casing, as opposed to submerging such cartridges in a tank filled with feedstock, overall low pressure performance is greatly improved. High permeate flow can be maintained for long periods of time between shutdowns for intensive cleaning. TMP is gradually increased to maintain a substantially constant rate of permeate discharge until a target is reached, indicative of solids accumulation on the membrane surface to an undesirable extent; then backflushing is effected for a short time. Discarding the hold-up volume of feedstock in the cartridge, the backflushing fluid and dislodged solids, allows production to be promptly resumed with fresh feedstock at performance at near original levels.

The invention provides an electrochemical-membrane separation water treating device, a treating method and an application thereof. The electrochemical-membrane separation water treating device comprises a reaction tank, wherein the reaction tank is internally provided with a membrane component; one side of the membrane component is provided with a sensing electrode and an anode plate from inside to outside in a manner of being parallel to the membrane component; the other side of the membrane component is provided with a cathode plate parallel to the membrane component; the anode plate and the cathode plate are connected with an external power supply; a water inlet is arranged at one side of a main body of the reaction tank; and a water outlet of the membrane component is arranged on the main body of the reaction tank and is connected with the membrane component. The electrochemical-membrane separation water treating device, the treating method and the application provided by the invention have the advantages that electric-field effect, electrochemical oxidation, electroflocculation and electroflotation are integrated, and by the action of electrooxidation and electroflocculation, the structure of pollutants is changed, the size of particles is adjusted, and a hydrophilic and porous filter cake layer is formed on the membrane surface, so that the pollution to the membrane is reduced; and the solid-liquid separation is carried out by membrane filtration, so that the quality of discharged water is further improved.

A novel fluid filtration system that exhibits antifouling properties against a variety of potential foulants includes at least one filtration membrane placed in a cross-flow filtration module. The module is subjected to microwave irradiation at a certain power or intensity over a controlled time interval. At least one microwave generator produces microwaves and may be fixed or movable to treat the fluid. Dislodged foulants are removed by the microwave electromagnetic energy from the filtration membrane and carried away in a cross-flow stream and wasted or recycled back to a feed solution container. The filtration system may use different filtration configurations such as, but not limited to, flat sheet, hollow fiber, spiral wound and tubular membranes. The filtration membrane materials may be polymeric, ceramic, and combinations. The functionalized membranes can be such as, but not limited to, membranes coated or blended or cross-linked with materials displaying strong microwave absorption; and combinations.

A new method for controlling membrane fouling in a membrane-bioreactor relates to a technology for controlling fouling of a membrane component in a membrane-bioreactor, and is suitable for treating water and waste water by a membrane-bioreactor. The invention forms a dual system of biofilm method and membrane-bioreactor by adding a certain amount of filler in the reactor as the carrier of the biofilm, thereby reducing the pollution rate of the surface of the membrane module; at the same time, the optimized aeration method can By controlling the metabolism of microorganisms to further slow down membrane fouling and reduce energy consumption. The method of the present invention does not require structural modification of the original membrane-bioreactor, only needs to add a certain amount of filler, and the method of the present invention can further reduce energy consumption, and is suitable for membrane-bioreactions in the form of various membrane modules It has strong practicability, wide application range, low operating cost, and convenient operation and management. The invention integrates the biofilm method and the membrane-bioreactor efficiently, and has an optimized aeration mode, can well control membrane pollution, reduce energy consumption, and realize long-term stable operation of the membrane-bioreactor.

The invention discloses a two-dimensional layered composite film and a preparation method and application thereof. The two-dimensional layered composite film comprises a base film; two-dimensional nanosheets which are vertically arranged on the surface of the base film to form a nanosheet layer; and nanospheres which are dispersed among the nanosheet layers. According to the prepared two-dimensional layered composite film, the stability of the layered channel of the film is improved through positive and negative electrostatic assembly, and then the stable nanofiltration separation performance is guaranteed; the size of the layered channel can be effectively regulated and controlled by utilizing the nanospheres with different sizes, so that the film pores can just intercept ions and molecules, the problem of poor molecular ion interception effect when the water flux is large is effectively solved, and the energy consumption in the separation process can be reduced; meanwhile, the hydrophilic nanospheres are introduced to enhance the anti-dirt and antibacterial capabilities, so that the film pollution and film degradation are effectively reduced.

A method and system for controlling dissolved oxygen levels in a secondary treatment system of a wastewater treatment facility that can employ a membrane bioreactor in which oxygen introduction into mixed liquor is controlled to prevent bulking and minimize generation of extra cellular polymeric substances. The control is exercised by insuring that dissolved oxygen levels within the mixed liquor do not fall below a minimum system level at which microorganism stress would occur. This is done by setting a minimum dissolved oxygen level control point equal to a sum of the minimum system level and an adjustment factor determined on the basis of oxygen uptake rate and time delays inherent in sensing oxygen levels and changes thereof within the mixed liquor. The minimum system dissolved oxygen level can be continually calculated on the basis of an inferred food to mass ratio that would vary with sensed mixed liquor suspended solids.

A mixture for treating water in a biological water treatment process is provided comprising an organic-based flocculant, a micronutrient; and a polymer. The flocculant, the micronutrient and the polymer are mixed in a predetermined ratio to enhance said biological water treatment. The mixture is particularly suited to enhancing flocculation of particles, reducing fouling on a surface of a membrane in a membrane bioreactor, improving uptake of phosphorous and/or nitrogen by a biomass in a biological water treatment system, improving bioactivity of a biomass and/or floc in a biological water treatment system and improving flux in a membrane bioreactor.

The invention discloses a double-aeration aerobic granular sludge-membrane bioreactor coupling device and application thereof, and belongs to the technical field of sewage treatment. The device of theinvention comprises a water inlet pipe, an outer cylinder, an inner cylinder, a first aeration assembly, an upper shell, a settling tank, a membrane pool body, a second aeration assembly and a wateroutlet pipe; a lower outer reaction zone is located between the outer cylinder and the inner cylinder, and an inner cavity of the inner cylinder is provided with a lower inner reaction zone; the firstaeration assembly is used for aeration in the lower inner reaction zone; an upper ascend flow zone is located between the upper shell and the settling tank, and an upper descend flow zone is locatedbetween the settling tank and a membrane biological reaction tank; the bottom part of the settling tank is connected with the outer cylinder through a return pipe; the membrane pool body consists of porous plates; a membrane assembly is arranged in the membrane pool body; the second aeration assembly is used for performing aeration scouring on the surface of the membrane assembly; and two ends ofthe water outlet pipe respectively communicate with an inner cavity of the membrane assembly and a clear water tank. The coupling device can fully guarantee the different aeration intensity and aeration rate requirements of the aerobic granular sludge and membrane bioreactor (MBR) membrane assembly.

The embodiment of the invention discloses an electrochemical membrane biological sewage treating device. The electrochemical membrane biological sewage treating device comprises a treating pond, a first electrode, a sacrifice electrode, a second electrode, a membrane component and a power supplying module, wherein the first electrode, the sacrifice electrode and the second electrode are arranged in the treating pond along a first direction in sequence; the activity of the sacrifice electrode is larger than the activity of the first electrode and the activity of the second electrode; the membrane component is arranged in the treating pond, and is arranged between the first electrode and the sacrifice electrode and/or between the sacrifice electrode and the second electrode; the power supplying module is electrically connected with the first electrode and the second electrode. Compared with the existing sewage treating device, the electrochemical membrane biological sewage treating device provided by the embodiment of the invention has the advantages that the quality of sewage treated can be improved and the membrane pollution can be reduced simultaneously.

The invention relates to a high-salt tolerant anion exchange membrane chromatography medium, a preparation method and uses thereof, wherein the chromatography medium is a separation medium containinga polydopamine coating adhered in a microfiltration membrane, and a salt-tolerant anion exchange ligand is coupled to the polydopamine coating. According to the present invention, the salt-tolerant anion exchange membrane chromatography medium can be used for biopharmaceutical purification, wherein the service life can be substantially prolonged due to the high hydrophilicity and the high mechanical strength of the membrane chromatography medium during the high-flow drug purification; and the whole preparation process is efficient, simple, low cost, and environmentally friendly.

The invention provides an MBR wastewater treatment system with deep denitrification and dephosphorization functions. The MBR wastewater treatment system sequentially comprises an anaerobic pool, a front anoxic pool, an aerobic pool, a rear anoxic pool and a membrane pool. The membrane pool does not contain an aeration part, a membrane set device realizes reciprocating motion through a mechanical transmission device, thus the membrane pollution problem is effectively solved, MBR process aeration energy consumption is further reduced, and the situation that the content of water outlet total nitrogen is increased due to excessive oxidation of sludge is further avoided. Through improvement for the membrane pool, the membrane pool directly returns a flow to the anaerobic pool, a process flow return form is simplified, and meanwhile, the situation that the biological dephosphorization effect is affected by flow return of DO and excessive nitrate nitrogen is further avoided. Through partitionaeration, the content of the DO of the control tail end of the aerobic pool is less than 0.1 mg/L, and the denitrification effect of the rear anoxic pool is improved, a flow return point and a rear dosing point are arranged at a middle section in the rear anoxic pool, thus denitrification of an internal source and an external source can be realized simultaneously, the denitrification cost is reduced, and when a carbon source is added externally, it can be ensured that the content of the water outlet total nitrogen is less than 1 mg/L. The MBR wastewater treatment system is used for municipalwastewater treatment and can realize earth surface IV-type water outlet when the carbon source is not added externally, wherein the content of TN is less than 5 mg/L, and the content of TP is less than 0.2 mg/L.

The invention discloses a method and testing device for reducing membrane pollution through an alternate inhomogeneous field. A lower filter cavity and an upper filter cavity are vertically symmetric about a flat plate micro-filtration membrane as a symmetric center, a needle point electrode device is arranged in the upper filter cavity, and a plate electrode is arranged in the lower filter cavity. The needle point electrode device is provided with array type needle point electrodes which are arranged in m rows from left to right and arranged in n lines from front to back, each needle point electrode is connected with a conductor wire, m conductor wires in each line of needle point electrodes pass through hollow pipes to be connected with a wire diverter, and the n wire diverters are connected to a MCU control box. A membrane hole is scoured by different angles through the alternately-changing field, foreign particles are made to move between the surface of the membrane and the electrodes, and the situation that the foreign particles are centralized on the surfaces of the electrodes or the surface of the membrane to cause pollution to the surfaces of the electrodes or the surface of the membrane can be avoided.

A plate membrane sludge simultaneous thicking digestion processing technology relates to excess sludge thicking in sewage treatment process, which is applicable to the treatment of excess activated sludge or mixing sludge obtained from mixing excess activated sludge with primary sludge in sewage treatment process, excess sludge and humus sludge obtained from biological dephosphorization process. The invention adopts a plate membrane and a plate membrane thickening digestion tank composed of a thickening digestion tank with a aerating apparatus, utilizes ultrafiltration (micro-filtration) thickening of the plate membrane to replace conventional sludge thicking method, and also utilizes the aerating apparatus to wash and maintain the plate membrane, provides hypoxia environment to sludge digestion, gets the object of sludge simultaneous thicking, digestion. Comparing with conventional sludge thicking digestion processing technology, the invention has advantages of using small floor space, low operating cost, easy to realize automatic control, has good social benefit and economic benefit.

The invention provides an alternate two-stage aerobic membrane bioreactor. The alternate two-stage aerobic membrane bioreactor comprises a first reactor MRR1, a second reactor MBR2, a regulating tank I, a flow meter, a valve, a centrifugal pump, an automatic-control motor case II, a water storage tank IV, an alkali liquor box III, an acid liquor box V, a first air blower GFJ1, a second air blower GFJ2, a perforated pipe aerating apparatus and an inka aeration apparatus. The invention can realize that after high concentrated organic waste water is hydrolyzed and acidized, the effluent is not subjected to methanogenic-phase reaction but directly enters into the aerobic membrane bioreactor for treatment, so that the effluent has qualified quality; and in the process, the effluent is ensured to be continuous, membrane fouling is retarded, membrane flux is recovered to the maximum limit, and full-automatic control, safety, stability and high efficiency are achieved.

The invention provides a system and a treatment method of graded recovery of pigments and sugar from molasses. The system comprises a microfiltration membrane treatment device, a nonpolar resin adsorption device, an ultrafiltration membrane treatment device, a nanofiltration treatment device, a demineralizing device and a reverse osmosis treatment device that are sequentially connected. The treatment method comprises the steps of sequentially performing microfiltration membrane treatment, nonpolar resin adsorption, ultrafiltration membrane treatment, nanofiltration treatment, demineralizing treatment and reverse osmosis treatment on the molasses separated by dilution. A technology can achieve recycling and high value utilization of the molasses; high-salt wastewater generated by resin regeneration is reduced; the pollution of an ultrafiltration membrane is avoided; sucrose transmittance is increased; and therefore, the molasses treatment cost by a membrane method is lowered.

The invention relates to a set for wastewater treatment and sludge reduction and application thereof, in particular to an A2O (anaerobic-anoxic-oxic), MBR (membrane bio-reactor) and miniature animal bio-bed set for wastewater treatment and sludge reduction and application thereof, and overcomes the defects that a traditional A2O process has low removal rate of nitrogen and phosphorous, a secondary sedimentation tank has large floor area, sludge yield is high and quality of outgoing water meeting the quality standard of recyclable water is difficult. The set comprises an anaerobic tank, an anoxic tank, an aerobic tank, an MBR (membrane bio-reactor) and a miniature animal bio-bed. The set is used for wastewater treatment and sludge reduction. The set has high removal rate of nitrogen and phosphorous and small floor area, the quality of the outgoing water can meet the quality standard of recyclable water, and a sludge amount is greater than 40% lower than that of the traditional A2O process.