I. Synopsis
MBR (Nembrance Bio Reactor), membrane biofilter: is a wastewater treatment system that filters bio membrane technology. MBR is an advanced wastewater treatment technology that combines a membrane with a dynamic tank system with a SBR aeration process and intermittent flow technology that can be used with both anaerobic and anaerobic tanks. Very effective in the treatment of complex organic and inorganic substances and pathogenic microorganisms.
II. Category
Type of MBR submerged into the MBR: actuated by suction or pressure, used primarily for the treatment of nitrogen and for the reduction of membrane contamination.
+ Type of installation : MBR membrane operates on the principle of recycling the reactor at high pressure. Nitrogen and ammonium filtration efficiency up to 85%
– Structure: MBR filter with 1mm thick hollow fiber filament to form a mesh of microscopic tentacles (0.001 micrometer)
III. Specifications:
+ Materials made of polypropylene
+ Capillary capacity: 40 – 50 micrometers
+ Capillary bundle diameter: 450 micrometers
+ Capillary gap diameter: 0.01 – 0.2 microns
+ Porosity: 40 – 50%
+ Tensile strength: 120 000 kpa
+ Filter design intensity: 6 – 9l / m2 / h
+ Module area: 8m2 / module
+ Operating pressure: 10 – 30 kpa
+ Capacity: 1 – 1.2 m3 / day
IV. Operation principle:
After preliminary treatment, the wastewater will be fed into a biological tank using MBR. Here the wastewater will be penetrated through the membrane wall into the capillary tube by microscopic holes of 0.01 to 0.2 microns.
Microorganisms, pollutants, muds are completely trapped at the membrane surface. At the same time, only fresh water passes through the membrane. The internal water is pumped out, the sludge in the tank and periodically remove the sludge tank.
Since the size of the MBR membrane is very small (0.01 ~ 0.2 μm), the biological sludge will be kept in the tank, with high microbial density and increased processing efficiency. Clean water will be siphoned into the reservoir and escaped without going through the settling tank, filtering and disinfection.
The external air blower provides the active micro-organisms with the task of blowing out the membranes to minimize clogging,
Pros and cons
– Advantages
+ The system is streamlined, easy to manage because there are few units.
+ Increase the efficiency of biological treatment to 10 – 30% due to MLSS 2-3 times increase compared to traditional Aerotank
+ Save construction area as replacement for the entire Aerotank, sedimentation phase 2, filtering, sterilization.
+ It is easy to increase capacity by expanding the scale by increasing the sludge concentration and filter area
+ Effective phosphorus treatment
– Disavangtages
+ The film is often blocked
+ Must use chemicals to clean the membrane (about 6 to 12 months depending on the nature of waste water)
Always require a supplemental amount of supplements and maintenance
+ To extend the life of the membrane, the membrane should be cleaned at the end of the shelf life. Choose the optimum washing method depending on the type of water used. The timing of washing of the film is determined by the pressure gauge.
– Clean the membrane
Option 1: Clean the membrane by blowing air: Use air blowing from the bottom so that the air bubbles enter into the intestinal membrane through the empty hole, extruding from the membrane.
Method 2: Clean the membrane by immersion in a chemical solution. If the pressure loss across the membrane is increased to 25 ~ 30 cmHg compared to normal, even if the membrane is washed with air, the membrane should be cleaned by soaking it in a separate chemical container for 2 to 4 hours. (Use chlorine 3 ~ 5g / L, take 6 ~ 12 months).