Single supply inverting op amp output
An inverting or non-inverting opamp amplifier doesn't really matter that much, the main issue is the supply voltage. The supply voltage determines the output voltage range of the amplifier. Obviously when using a single-supply the output cannot go negative.

Let me illustrate that here:



The blue curve shows a pure sinewave which can have positive and negative values. You could get this when using an amplifier with a positive and a negative supply rail.

The red curve shows what happens when we try to make the same (blue) curve but in the situation where only a single (positive) supply is available. The sinewave becomes distorted, all its values below 0 V are "clipped".

To solve this we need to "lift" the voltage with a constant value. I used 1 V in this example. Adding a 1 V DC bias means the sinewave is "lifted" so that all its values become positive, see the magenta curve. For reference I re-plotted the red curve into the same figure as well.

If that 1 V DC offset is a problem it can often be removed using an AC coupling capacitor.