Can anyone offer any suggestions on how to kill off any seeds dispersed
within home-made compost?

I have a large compost heap made from weeds and long grass, among other
things, and probably contains a lot of unwanted seeds. The large heap is
now about three months old and has been turned twice. Perhaps some of the
weed seeds have now been destroyed due to the heat generated within the
heap, but past experience causes me to suspect that many will not have been
killed.

I plan to use the compost to create a new lawn, using grass seed, in an
area where the soil is very poor. Last time I did this, the weed seeds
within the compost were prolific and started to sprout after the compost
was spread on the ground.

Thanks..

Al