there are only 32 colleges for environmental engineering.. and the first two college which you listed is not there

Siddh zalavadia Manipal provides environmental engineering at pg level, you can check it by going through its official page for which link is:- https://manipal.edu/mit/programs/program-list/mtech/mtech-environmental-engineering/eligibility.html

Same is the case with SRM , for SRM environmental engineering programme go through :- http://www.srmuniv.ac.in/node/908

thankyou