Output Voltage Ripple Considerations
The output ripple is an INPUT to the design process. Usually you as the engineer are aware of how much Voltage ripple the device that is consuming the power can tolerate. 30mV seems somewhat reasonable for general use, but would entirely too much for a small 1.8v supply that is power sensitive digital electronics. Only you can say how much output voltage ripple is enough. 

As far as 2200uF goes, don't forget you can split your capacitance between several physical capacitors and connect them up in parallel.