You required two legal Certificates to set-up this plant-
a. SSI (Small Scale Industry) Certificate.
b. NOC (No objection Certificate) from PCB (Pollution Control Board)
As such there is no problem to get the NOC i.e consent to establish from Pollution Control Board, but it also depends in which state you want to set up this project.
Here in this article by Divya Interantional you will get an norms requirement to set-up Pyrolysis Plant in Rajasthan.