MBR membrane Compared with the advantages of hollow fiber membrane, the flat membrane separation equipment, as an efficient clean energy integrating separation and extraction, has the characteristics of simple operation, convenient maintenance, low energy consumption, strong adaptability, etc., and has gradually been widely understood by ecological environment protection workers and environmental protection personnel Cognitive ability and its application in wastewater treatment in related fields.
Advantages of flat membrane and hollow membrane
(1) Stronger anti fouling characteristics.
Compared with hollow fiber membrane MBR membrane bioreactor, flat membrane MBR membrane bioreactor can maintain the stable operation of high-throughput sequencing (diffusion coefficient, i.e. membrane water yield) at a higher concentration value of activated sludge process, and has lower provisions for preparatory treatment.
In the whole process of specific application, although there will be machines and equipment such as Geshan and depilators in the preparatory treatment equipment, some objects such as hair will inevitably enter the hydrolysis acidification pool.
During the operation of the hollow fiber membrane MBR membrane bioreactor, the membrane filaments are always in a quivering state under the condition of the hydrolysis acidification tank, so this kind of hair is very easy to make the membrane filaments coiled together. When the sludge sedimentation ratio reaches a certain level, mud lumps will appear, which will make more and more membrane filaments coiled together, greatly reducing the reasonable total membrane area of the hollow chemical fiber filaments, This causes a sudden drop in the diffusion coefficient of the membrane, and this kind of problem is also difficult to repair. Generally, only replacement is needed.
Available activated sludge process concentration value (MLSS) category of flat membrane MBR membrane bioreactor
At 6000-10000Mg/L, it is far higher than the hollow fiber membrane bio tube reactor. The structure of the flat membrane module is composed of two membrane components in sequence, which completes the controllability of the middle gap of the pulse damper, which is conducive to the online cleaning of the membrane surface by gas-liquid mixed flow, and has anti pollution usability. In addition, the flat membrane MBR membrane bioreactor can adjust the compressive strength of the hydrolysis acidification tank at the bottom of the module according to the flushing effect of the water vapor compound on the surface of the pulse damper, which is a very good attachment to the * * * membrane surface. Even if the deposition condition on the membrane surface is caused by such factors as excessive sludge viscosity in a short time, the pulse damper can also be removed in sheet form, The hollow chemical fiber is unlikely to be cleaned in this way.
(2) Excellent mechanical equipment reliability, no broken wire condition.
In the whole process of specific application, the hollow fiber membrane module will inevitably produce broken wires, which includes two reasons:
First, because of the uneven thickness caused by the shortcomings in the whole spinning process, this kind of situation is naturally rare, and can be further prevented according to the purchase of famous products and other ways;
The second is the root fracture caused by the exhaustion of spinning raw materials.
The hollow chemical fiber must be sealed with epoxy resin adhesive in the area where the components are connected on both sides, because the diffusion of the chemical fiber itself will undoubtedly absorb a small section at the root. Due to the hydrolysis acidification tank, the hollow chemical fiber will be in a strong vibration condition during operation all the time, which will cause fatigue of raw materials at its root for a long time. The epoxy resin adhesive itself is a ductile raw material, and the fracture caused by fatigue of such raw materials
Once silk is produced, it is usually large-scale. For membrane MBR membrane bioreactor, the damage is fatal. It will not only seriously damage the water outlet, but also continue to cause damage to all components. What is different from this is whether there is a waterproof cloth inside the flat membrane as the drainage layer, and the 3mm~5mm ABS plate as the support point layer, so the compressive strength is much higher than that of hollow chemical fiber, and it is not easy to have similar conditions at the root, which can completely ensure high-quality water outlet. (3) The cleaning method is more convenient and fast, and the cleaning cycle time is longer.
The cleaning of membrane modules is divided into online cleaning and offline cleaning.
The online cleaning of hollow fiber membrane is quite common, and the cleaning process is complicated. The selected organic chemicals must be pumped into the membrane filament according to the usage amount for cleaning. On the one hand, the online cleaning of flat membrane is completed according to the hydrolysis acidification tank in operation, and on the other hand, it is completed according to the online organic chemical cleaning.
The flat membrane MBR membrane bioreactor can carry out reasonable hydropower flushing on the surface of the pulse damper according to the amount of hydrolysis acidification tank in the hydrolysis acidification tank system software at the bottom of the control module, so as to avoid excessive deposition of sludge on the membrane surface during the whole process of liposuction, and has the control effect on the environmental pollution of the membrane surface during the whole process of operation. The organic chemical cleaning (online cleaning) of the flat membrane module is also easier, and only the prepared drugs must be poured back into the pulse damper from the liposuction port to soak for a period of time.
For off-line cleaning of hollow fiber membrane, all membrane modules must be lifted out and placed in the cleaning pool, and then soaked with organic chemicals. The cleaning of flat membrane can not only lift out membrane components for cleaning, but also pull out membrane components for cleaning. The diversity of offline cleaning methods for flat membrane also solves the problem that the project site is narrow and not suitable for hoisting. In addition, compared with hollow chemical fiber membrane MBR membrane bioreactor, the cleaning cycle of flat membrane MBR membrane bioreactor is longer, and the cleaning cycle time can reach more than 3 months, and if the pressure is relatively low from beginning to end, it can even not be cleaned. The flat membrane module can also repair the membrane diffusion coefficient according to physical cleaning methods such as bottom pressure water * * * cleaning, which is basically impossible for hollow fiber membranes.
(4) Long life and low operation cost
According to incomplete statistical analysis, the per capita life of hollow fiber membranes on the market today is about four years in domestic sewage treatment, municipal engineering sewage and similar domestic sewage treatment projects, about two years in chemical wastewater, pharmaceutical wastewater and other engineering projects, and about two years in garbage leachate, electroplating wastewater treatment Insoluble organic chemical sewage and other engineering projects are basically not applicable.
On the sales market, the average life of flat membrane is about five years in domestic sewage treatment, municipal engineering sewage and similar domestic sewage treatment projects, and about three years in chemical wastewater, pharmaceutical sewage and other engineering projects. It can be used for landfill leachate, electroplating wastewater treatment, insoluble organic chemical sewage and other engineering projects.
The replacement cycle time of flat membrane is longer than that of hollow fiber membrane, so the operation cost is significantly reduced and the excellent operation condition is ensured. In addition, the flat membrane can be replaced in one piece, and the replacement cost is relatively lower
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(5) The whole process of pulse damper replacement is simple
Because of the unique design scheme of the flat membrane module, the pulse damper can be replaced one by one without replacing the support frame during the whole process of destruction and replacement of the pulse damper. However, if the number of broken chemical fiber membrane wires in the middle reaches a certain amount, all modules will be damaged. If all membrane modules need to be replaced, the cost will be greatly increased.
Elimination of microbial strains (* * *, algae): when there are microbial strains in the water, after entering the pre solution system software, some intercepted microbial strains are likely to adhere to the pre solution system software, such as the material surface of the multi material filter device. When it adheres to the surface of Dow reverse osmosis membrane, it will grow, develop and breed, which is likely to block the microplate completely, or even block the inner wall of hollow chemical fiber completely. The existence of microbial strains has extremely serious adverse effects on hollow chemical fiber Dow reverse osmosis membrane. High attention must be paid to the removal of * * *, algae and other microbial species from raw water. NaClO, O3 and other reducing agents are generally added in the water treatment technology, and the concentration value is generally 1-5mg/l. In addition, UV * * * can also be used. The hollow chemical fiber Dow reverse osmosis membrane module can be solved by hydrogen peroxide (H2O2) or potassium permanganate solution circulation system for 30~60min in the laboratory. The solution of eliminating microbial strains can only eliminate microbial strains, but it can not remove microbial strains from water, but only avoid the breeding of microbial strains.
MBR wastewater treatment is very different from traditional wastewater treatment methods. According to membrane separation technology and equipment, it replaces the secondary sedimentation tank and tertiary process treatment in traditional handicrafts. Thus, high-quality water output can be obtained, which solves the problem that the water output of traditional environmental protection machinery for wastewater treatment cannot meet the requirements of industrial wastewater treatment. The water after MBR wastewater treatment can be immediately used as municipal engineering tap water or further used as various industrial water.
