Generate terrain

Its possible to regenerate some particle of world?I mean,set that particle to the same form in which it was created.

ehm.. use repeatingtask ?

And what can I do with this task?I think nothing

*repeating*task

you can set particles every second ?

And what can I do with that?

Repeat a determinate action each x ticks, so you can spawn each 20 ticks (1 second) the particle again, this means that the particle will be always spawned.
If this is not what are you trying to do, please, explain as well your question.