If each airlift is only 110mm diameter I could have the airlifts side by side along the edge of the 4m I think?

In regards to your figures. I think you do have a typo

Your first results state you get the higher LPH at a shallower level. It should be more LPH at deeper leve?

So the length rising pipe for stat 1 and 2 should be flipped?

If i understand the way it works correctly

Results:

Pressure chamber Airlift:

Pump------Diameter rising pipe--------Length rising pipe--------Litres per hour-------consumption-------watt/m³

SLL20----------------110---------------------------170---------------------15.000----------------9 watt------------0,6 watt

SLL20----------------110---------------------------145---------------------20.000---------------12 watt------------0,6 watt

SLL30----------------110---------------------------170---------------------22.000---------------17 watt------------0,7 watt

SLL40----------------110---------------------------170---------------------24.000---------------32 watt------------1,3 watt

Zenkoi membrane disk Airlift (24cm) with 250