Advantages and disadvantages Airlift pump

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1 advantages , disadvantages

1.1 advantages
1.2 disadvantages
1.3 design improvements





advantages , disadvantages
advantages

the pump reliable. simple principle clear advantage. air higher pressure liquid required.
the liquid not in contact mechanical elements. therefore, neither pump can abraded (which important sandwater wells), nor contents in pipe (which important archeological research in sea).
act water aerator , can in configurations lift stagnant bottom water surface (of water tanks).
since there no restrictive pump parts, solids 70% of pipe diameter can reliably pumped.

disadvantages

cost: while in specific case operational cost can interesting, of time, quantity of air compress high compared liquid flow required.
conventional airlift pumps have flow rate limited. pump either on or off. difficult wide range of proportional flow control varying volume of compressed air. dramatic disadvantage in parts of small wastewater treatment plant, such aerator.
the suction limited.
this pumping system suitable if head relatively low. if 1 wants obtain high head, 1 has choose conventional pumping system.
because of principle, lot of air remains in liquid. in case, can problematic, as, example, in waste water treatment plant, before anaerobic basin.

design improvements

a geyser pump, improved airlift pump, powered compressed air, raises fluid forcing rising bubbles displace fluid. 50. air supply. 52. air inlet port. 58. liquid supply. 60,62. air supply lines. 64. upper end of air tank 86. 66,82. air ports. 70. upper air inlet of u-shaped elbow 74. 76 air outlet. 84. fluid intake. 65. riser tube. 88. displaced liquid. 90. pump outlet. l:liquid, wastewater. ll:liquid level. vvv:vessel g:gravel or solids


a recent (2007) variant called geyser pump can pump greater suction , less air. pumps proportionally air flow, permitting use in processes require varying controlled flows. arranges store air, , release in large bubbles seal lift pipe, raising slugs of fluid.



airlift pump (left) compared geyser pump (right)








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