44results about How to "Extended chemical cleaning cycle" patented technology

The invention relates to a purification system for micro-polluted raw water, comprising a stripping oil separation tank, a coagulating sedimentation tank, a coagulating chemical dosing device, a first middle water tank, a water feeding pump, a biological aerated filter, a second middle water tank, a coagulating chemical dosing unit, a filtering lift pump, a multi-media filter, a manganese sand filter, an active carbon filter, an acid dosing device, a scale inhibitor dosing device, a mixer, a reverse osmosis device, an alkali dosing device, a disinfection device and an ultraviolet sterilization device. The purification system for micro-polluted raw water disclosed by the invention has the following advantages that: main pollutants are especially removed at first, and then a reverse osmosis technology is used as a safety guarantee; the reverse osmosis pre-treatment is designed adequately, and the operation of the system is safe and stable, so that the occurrence frequency of pollution and blockage phenomena is greatly decreased, chemical cleaning period is greatly prolonged, and the recycling rate of water is up to 75%; and the purification system is suitable for the occasions of treating the drinking water of municipal administration, villages, industrial enterprises and mine fields or for the occasions of reusing the reclaimed water which needs advanced treatment. The invention further refers to a purification method of the purification system for micro-polluted raw water.

The invention provides a coking wastewater advanced treatment and evaporative crystallization zero discharge process which comprises the following steps: A) sequentially performing flocculation treatment, catalytic ozonation treatment, biological activated carbon filter treatment, multi-medium filtration, ultrafiltration treatment and first reverse osmosis concentration treatment on coking wastewater subjected to biochemical treatment, so as to obtain first treated water and first concentrated water; (B) sequentially subjecting the first concentrated water to two-stage softening treatment and second reverse osmosis concentration treatment to obtain second treated water and second concentrated water, wherein the first-stage softening adopts chemical softening and microfiltration combined filtration treatment, the second-stage softening adopts resin softening; and C) carrying out evaporative crystallization on the second concentrated water to obtain third treated water and crystal salt. The process is reasonable in linkage, stable, efficient and safe to operate and good in treatment effect, the treated water can be used as production process water or circulating cooling water replenishing water, finally zero emission of the coking wastewater is achieved, and economic benefits are remarkable.

The present invention provides a hollow fiber ultra-filtration membrane preparation method, which comprises: preparing a membrane casting liquid, wherein the membrane casting liquid comprises a polymer, a pore forming agent, and a solvent; preparing a first gel bath, a second gel bath and a third gel bath, wherein the first gel bath comprises triethylene glycol and diethylene glycol, the second gel bath comprises glycerol or triethylene glycol, and the third gel bath is water; preparing a core liquid; extruding the membrane casting liquid and the core liquid through a spinning device to obtain hollow fibers having a nascent state; and sequentially immersing the hollow fibers having the nascent state in the first gel bath, the second gel bath and the third gel bath to obtain the hollow fiber ultra-filtration membrane. With the preparation method of the present invention, the hollow fiber ultra-filtration membrane with characteristics of compact inner surface, compact outer surface and topological structure cross section from the skin layer to the cross section can be obtained, and further has characteristics of high membrane strength, small membrane pore size, narrow pore size distribution, and high membrane flux.

The present invention relates to boiler feed water treating technology, and is especially water treating method for directly air cooled steam drum boiler. Under the reductive condition, the condensed water from the condensing water tank is added with ammonia before entering the boiler directly under the condition of closing the oxygen discharging door of deaerator and the water hydrogen conductivity is controlled below 0.2microS/cm. In case of poor water quality, the oxygen discharging door is opened to convert into reductive mode. The present invention alters the traditional concept that dissolved oxygen will result in corrosion, and has double compact oxide film formed on surface of metal to inhibit the flow corrosion in thermal system, fine treatment of condensed water for long running time, no use of carcinogenic hydrazine and lowered ammonia adding amount for environment protection and health, and raised equipment utilization.

The invention discloses a reverse osmosis pretreatment deep oil-removal process for cold rolling oily wastewater, which comprises the following steps of: (1) before the cold rolling oily wastewater enters a chemical film dipping filter, adding sodium hypochlorite with the volume concentration of 8-12ppm, basic aluminum chloride with the volume concentration of 2-4ppm and anionic polyacrylamide with the volume concentration of 0.05-.-0.2ppm into the cold rolling oily wastewater; (2) intercepting the flocculated cold rolling oily wastewater by using a multi-medium filter, controlling the filtering speed to be 4-6m/s, and controlling a silt density index (SDI) to be less than 3; and (3) allowing the pretreated cold rolling oily wastewater to enter a filter with a chemical film dipping filter element, and controlling the flux value of the filter element to be 0.1-0.4m<3>/m<2>s.

The invention discloses an advection sedimentation/immersion type ultrafiltration integrated water treatment device, relating to an ultrafiltration integrated water treatment device and solving the technical problems of long process and large occupation area of an existing ultrafiltration water treatment device. The advection sedimentation/immersion type ultrafiltration integrated water treatment device comprises an advection sedimentation tank, an immersion type ultrafiltration membrane assembly, a membrane assembly supporting tool, an ultrafiltration water outlet pipe, an ultrafiltration water outlet valve, an ultrafiltration sucking pump, an online vacuum pressure sensing device, an ultrafiltration backwashing valve, an ultrafiltration backwashing pump, a bubble diffusing device, an aerating pipe, a gas flow meter, an aerating valve, an aerating pump, a steady flow plate, a mud collecting tank, a perforation mud discharging pipe, a mud discharging valve and a sawtooth-shaped backwashing overflow weir, wherein one end of the ultrafiltration water outlet pipe is communicated with the immersion filtration membrane assembly, the other end of the ultrafiltration water outlet pipe is communicated with the ultrafiltration water outlet valve, the ultrafiltration water outlet valve is connected with the ultrafiltration sucking pump, one end of the aerating pipe is connected with the bubble diffusing device, the other end of the aerating pipe is connected with the aerating valve, and the mud discharging valve is arranged at one end of the perforation mud discharging pipe, outside a tank. The advection sedimentation/immersion type ultrafiltration integrated water treatment device is mainly applied to the field of water treatment.

The invention relates to the technical field of sewage treatment, and in particular, relates to an ultrafiltration micro-flocculation accurate dosing control method and system. The method comprises the steps: calculating a preset value of a first pressure difference before first backwashing and a preset value of a second pressure difference before last backwashing in each chemical enhanced backwashing period; calculating to obtain a preset value of a third pressure difference between the first pressure difference and the second pressure difference; predicting a predicted value of the third pressure difference; and comparing the preset value of the third pressure difference with the predicted value of the third pressure difference, and judging whether the chemical is continuously added or not. In the method provided by the invention, the preset value of the third pressure difference is obtained according to the preset value of the first pressure difference and the preset value of the second pressure difference, the predicted value of the third pressure difference is predicted according to the pressure difference curve formed by the online filtration pressure difference data, and the ultrafiltration operation state can be speculated by comparing the preset value of the third pressure difference and the predicted value of the third pressure difference; and the dosing state or dosage of a chemical can be adjusted in time according to the running state of ultrafiltration, so that good and stable running of an ultrafiltration system is ensured.

The present invention relates to a chemical cleaning method for an RO/NF membrane system consisting of two arrays and, more particularly, to a chemical cleaning method for an RO/NF membrane system consisting of two arrays, capable of predicting a substance that causes membrane fouling and chemically cleaning a reverse osmosis membrane module and a nanofiltration membrane module using a chemical cleaning agent suitable for the substance, thereby restoring and maintaining the filtration performance of the membrane. The membrane fouling phenomenon occurs due to various causes during the membrane filtering process. In this case, the present invention can enhance cleaning efficiency by predicting a substance that causes membrane fouling and performing chemical cleansing with a chemical cleaning agent suitable for the substance. Accordingly, a longer chemical cleaning cycle is guaranteed, thereby reducing the time consumed for chemical cleaning, chemical costs, etc.

The invention discloses an outer-layer coating tubular microfiltration membrane. The outer coating tubular microfiltration membrane comprises a macromolecular microporous filter tube, wherein one endof the macromolecular microporous filter tube is sealed, and only the outer layer and micropores of the macromolecular microporous filter tube are coated with tubular microfiltration membranes adopting an anchored structure. The outer-layer coating tubular microfiltration membrane has the advantages of high strength, long service life, high filling density and the like. An assembly of the outer-layer coating tubular microfiltration membrane is operated in external pressure type and dead-end filtration manners, the proportion of concentrated water to produced water can be adjusted, backwashingand aeration can be conducted periodically, the chemical cleaning cycle of the membrane assembly can be prolonged, and the energy consumption and the wastewater treatment cost can be reduced.

The invention belongs to the technical field of sewage treatment, and discloses a method and a system for improving and transforming the water production rate of a membrane system. The method comprises the following steps: monitoring the quality of water produced by the membrane system in real time by using a bio-filter effluent quality monitoring subsystem, if the quality of the water produced exceeds a threshold value, evaluating membrane pollution by using an ultra-filtration membrane pollution analysis subsystem, and formulating the operation parameters of a membrane workshop back-washing dosing subsystem according to an evaluation result, so that the membrane component is subjected to back-washing. Through the evaluation of the ultra-filtration membrane pollution analysis subsystem, the operation parameters of the membrane workshop back-washing dosing subsystem are formulated, and the real-time monitoring of the bio-filter effluent quality monitoring subsystem is matched, so that the stable operation of the membrane system is realized.

The invention relates to a backwashing method applicable to control of pollution of an internal compression type membrane and belongs to the field of water treatment. The backwashing method is applicable to ultra-filtration systems, microfiltration systems and the like. The backwashing method comprises the steps of directionally washing in the membrane, adding chlorine and backwashing and the like. The backwashing method applicable to control of pollution of the internal compression type membrane adopts a method of adding chlorine to carry out backwashing on account of the characteristics that pollutants in membrane filaments are strong in adhesion to the surface of the membrane and have small possibility of being removed by using a normal backwashing method; the back washing method comprises the following steps: oxidizing and modifying the pollutants adhered to the inner surfaces of the membrane filaments by adopting the oxidization performance of the chlorine, reducing the adhesion of the pollutants to the membrane, loosening and even peeling off a pollution layer of the membrane, carrying out backwashing and directional washing to wash the pollutants out of the internal compression membrane system, thus controlling the pollution of the ultra-filtration systems. In addition, by adopting the bactericidal performance of the chlorine, the membrane pollution caused due to bacterial growth can be effectively controlled. Since the method is capable of effectively controlling the membrane pollution, the chemical washing period of the internal compression type membrane can be prolonged, thus the service life of the membrane can be greatly prolonged.

The invention discloses a reverse osmosis system capable of continuously operating and continuously chemically cleaning. The system comprises a purification system and a cleaning system, the purification system comprises at least two groups of reverse osmosis assemblies, which are arranged in parallel; and the cleaning system comprises a plurality of branch cleaning assemblies arranged in parallel. The branch cleaning assemblies and the reverse osmosis assemblies are arranged in one-to-one correspondence; at least two reverse osmosis assemblies are arranged in parallel, when part of the reverse osmosis assemblies are polluted, the reverse osmosis assemblies can be seamlessly switched to other reverse osmosis assemblies to purify produced water, at the moment, the polluted reverse osmosis assemblies can be cleaned, it is guaranteed that the purification system continuously outputs purified water, and the water use requirements of production enterprises are met. Due to the fact that pollutants on the reverse osmosis surface can be flushed regularly, shutdown of the system is avoided, operation of the whole system is not affected, the chemical cleaning period of reverse osmosis is prolonged, the frequency of chemical cleaning of reverse osmosis is reduced, and the service life of membrane elements in the reverse osmosis system is prolonged.

The invention relates to an immersed membrane biological integrated reactor and application, in particular to an immersed membrane biological integrated reactor for standard reinjection of oilfield produced water into an ultra-low permeable layer and application. The invention aims to solve the problems that the organic matter degradation efficiency is low and the treated water quality does not reach the standard when the existing device is used for treating the reinjection ultra-low permeable layer produced water. An immersed membrane biological integrated reactor for an ultra-low permeable layer for standard reinjection of oilfield produced water comprises a box body, and the interior of the box body is divided into a plurality of reaction chambers by baffle plates along the water flow direction; the plurality of reaction chambers comprise a first anaerobic chamber, a second anaerobic chamber, a third anaerobic chamber, an anoxic chamber, a first aerobic chamber, a second aerobic chamber and an immersed membrane reaction chamber which are sequentially connected in series. The invention relates to a submerged membrane biological integrated reactor for reinjecting oilfield produced water to an ultra-low permeable layer after reaching the standard, which is used for treating the produced water of the ultra-low permeable layer after being reinjected. According to the invention, the immersed membrane biological integrated reactor for reinjection of oilfield produced water to the ultra-low permeable layer after reaching the standard can be obtained.

The invention provides an RO membrane module system and an operation method. Liquid enters a high-pressure pump through a feeding pump; under the action of the high-pressure pump, the liquid enters anRO membrane module to obtain reverse osmosis produced water and reverse osmosis concentrated water; and under the condition that the feeding pump continues to operate, the high-pressure pump is stopped for a period of time, and a membrane layer in the RO membrane module is flushed. By utilizing the principle of a reverse osmosis membrane, the pollution of the RO membrane module can be effectivelydelayed, and the chemical cleaning period of the RO membrane module is prolonged by 1.5-2 times. The chemical cleaning period of the RO membrane module is prolonged so that the cost of chemical agents for cleaning the RO membrane module is reduced, the long-time stable operation of the system is ensured, the enterprise investment cost can be effectively reduced, and energy conservation and emission reduction are realized for enterprises. The whole process flow of the system is simple, and the system has the characteristics of simple device structure, strong operability, small occupied area and the like.