The difference between a UASB system common wastewater treatment system that saw the obvious is a high style tank and waste water is fed into the bottom of the tank, reaction flow back up to the top (Upflow Feeding)
The difference between the UASB reactor effluent treatment system which clearly is a drum and waste water is fed into the bottom of the reactor to flow back up to the top (Upflow Feeding).
The difference between UASB system with the water treatment system in general is obviously is a tank style high and the waste water can be entered into the bottom of the reactor to flow back up above. (Upflow Feeding).