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Basic conditions for gas-liquid-solid three-phase separators
- Jul 20, 2018 -

The important structure of gas-liquid-solid three-phase separator EGSB, UASB and other anaerobic reactors plays an important role in the normal operation of the sludge bed and the good effluent quality. In practical applications, the gas-liquid-solid three-phase separator has two functions, one is to collect the biogas generated from the reaction chamber under the separator; the other is to precipitate the suspended matter above the separator.


To achieve these two functions, the gas-liquid-solid three-phase separator installed in the anaerobic reactor should meet some basic conditions. First, the bubble must be separated before the mixture of water and sludge enters the precipitation chamber; the surface load of the sedimentation zone should be below 3.0 m3/(m2•h), and the flow rate through the inlet channel is not before the mixture enters the sedimentation zone. It is larger than the sedimentation speed of granular sludge.


Since the anaerobic sludge has a coagulation property, when the liquid flow rises through the mud layer, it is advantageous to form a sludge layer in the gas-liquid-solid three-phase separator precipitator. The angle of the inclined wall in the sedimentation zone should be appropriate, so that the sludge deposited on the inclined bottom should not accumulate and slide back into the reaction zone as soon as possible. In addition, it is necessary to prevent the air chamber from generating a large amount of foam; and to control the height of the air chamber.


According to the above requirements, the gas-liquid-solid three-phase separator can be PP welded because the PP material has lower heat distortion temperature, low transparency, low gloss, low rigidity, and stronger impact strength; The surface stiffness and scratch resistance are very good, and there is no environmental stress cracking problem, which meets the application requirements of gas-liquid-solid three-phase separator.