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Saturday, 11 July 2020
Saturday, 21 Tīr 1399
السبت, ۱۹ ذو القعدة ۱۴۴۱

  • Membrane filtration is a type of physical filtration with pressure difference of 2 sides of membrane as driving force. Separation is based on size distribution and molecular properties. In fact, membrane is like a physical barrier and separates the slurry. Membranes are made of polymers or synthetic mineral materials.

Membrane filters are divided into several types:

  • Micro Filters
  • Ultra Filters
  • Nano Filters
  • Reverse Osmoses Filters
  • Main application of membrane filters is separation of Proteins and colloid particles. They used in Food, pharmaceutical, Diary, water and wastewater industries.
  • Membrane filtration is an optimal solution for energy consumption. For example, it can be used in wastewater treatment. They are especially used in evaporation process of two azeotropic mixtures. Turbinedar Company is using NF, UF, MF and RO for its packaged filtration equipments. In some cases like high temperature and acidic or alkaline environments, it is essential to use special membranes.

UF

  • Ultra filtration is a high tech filtration for separation, purification and condensation of fluid based on screening. It has advantages like more efficiency, low energy consumption and having less pollution. Because of these advantages UF is used in petrochemical, pharmaceutical, medical, metallurgical, electronic, energy, food, textile, marine and space industries. UF is a pipe with the micro screens on its wall. Smaller particles and solvent are passing through membrane but other particles (bacteria, virus, colloid matters and …) remains on the membrane. UF is used for filtration of particles with the range of nanometer to 0.5 micron.

Applications:

  • Water treatment:pre filtration must be written this way before RO in electronic industries, reusing wastewater and producing municipal water, producing pathogen less water for medical industries, producing pure water for food and Cosmetic industries.
  • Water recycling:MBR for wastewater treatment, wastewater treatment and recycling of industrial water (sugar, oil, dextrin and plating industries), wastewater with PVA treatment (textile, print and color industries)
  • Food industries:recycling protein from cheese water, cream concentration, clarifying and removing bacteria, purification and concentrating of juice, gelatin concentration, recycling sugar from sugar juice.
  • Medical industries:purification of antibiotics and interferon, removing plasma from blood, removing proteins and extraction of tinctures.
  • Machinery industries:increase useful life of plating solution, separation of oil and water, filtration of solution for removing grease.
  • Automotive industries:recycling electrolyte paint.

 

MBR

  • It is possible to optimize the process of wastewater treatment with membrane filters. One of the best ways to increase capacity in limit space of treatment plants is membrane biological reactor (MBR).  MBR is a system with biologic treatment and submerged membrane. This process will replace sedimentation, aeration and filtration units. It reduces capital and operation costs. Reducing additional active sludge and improving effluent quality are its additional advantages.
  • In MBR process, hollow Filamentous membranes or submerged pipe will be placed in aeration unit and filtration will be done by mean of vacuum pump. Air flow will clean membrane surface and excess sludge will be pumped straight from aeration unit.

Applications:

  • Increasing the capacity of active treatment plants
  • Treating the concentrate wastewater like wastewater of food or pharmaceutical industries
  • Treating the wastewaters with high concentration of ammonium
  • Treating wastewater in limited space treatment plants
  • Reusing and recycling effluent of treatment plants

Note:   it is possible to use NF filters for filtration of nano range particles.

 

Pervaporation Technology:

  • Pervaporation technology is combination of evaporation and membrane exudation with respect to energy saving. This process requires lower temperature and pressure than distillation process for azeotropic solutions.
  • In pervaporation mixture will be contacted by the membrane. In exudation side pressure will be produced by vacuum pump, liquid will pass through the membrane and evaporates in low pressure and will be removed and condensed. More energy will be saved by pervaporation than the distillation process. In case of azeotropic solutions the distillation process needs more capital cost than pervaporation process. Pervaporation is used commonly in dewatering of ethanol and isopropanol.

 

 prevaporation

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