Removing ants

Hi, I have a major problem with ants, there is approximately 30 nests over my front and back lawns, I've tried the white ant powder, which in the past years has worked, but seems useless now and has no effect on them.
Regards John

 

Put clay flower pots upside down over them, when they move the nest into them for the warmth, slide a spade under it and move it to a neighbour's lawn, preferably wearing a balaclava