Views: 12 Author: NanoMemTM Publish Time: 2019-11-06 Origin: Site
As the characteristic of high strength and corrosion resistance, ceramic filter can maintain membrane filtration performance. It can use aeration cleaning, backwashing, chemical backwashing and high pressure cleaning to regenerate flux.
Air and hydraulic backwashing: reduce the blockage (rise of the trans-membrane pressure).
If Air Backwashing (AB) is selected, air backwashing is carried out in a set time period, and an air backwash program is performed within each operation cycle. When air backwashing, high-pressure air passes through the membrane wall from the membrane plate, and the suspended pollutants are taken away from the surface of the membrane. The air backwash generally uses the air compressor for air supply, the recommended backwash pressure is +250KPa (2.5 Bar), and the air volume of air backwashing is 2~3 times the one of aeration volume. When the air backwash pressure over +600KPa (6 Bar) (typical value), and could automatically reduce the frequency of the backwash blower, so that the air backwash pressure is kept in the lower limit of the +40KPa(0.4 Bar) (typical value). In order to avoid mixing contaminants in the backwash air into the membrane, it is recommended to install air filters at the outlet of roots blower.
Figure schematic diagram of air backwashing in MBR system, (the green state is on.)
T1: sludge flow transmitter; T2: level transmitter; T3: water pump pressure transmitter; T4: water yield flow transmitter; T5: cleaning flow transmitter; T6: air flow transmitter; B1: effluent pump; B2: backwash pump; B3: sludge reflux pump; B4: sludge discharge pump; B5: roots blower; Tank1: citrate tank; Tank2: sodium hypochlorite can;
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