Science

Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. Biogas is a renewable energy source and in many cases exerts a very small carbon footprint.
Biogas can be produced by anaerobic digestion with anaerobic organisms, which digest material inside a closed system, or fermentation of biodegradable materials.
Biogas is primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulfide (H
2S), moisture and siloxanes. The gases methane, hydrogen, and carbon monoxide (CO) can be combusted or oxidized with oxygen. This energy release allows biogas to be used as a fuel; it can be used for any heating purpose, such as cooking. It can also be used in a gas engine to convert the energy in the gas into electricity and heat.

Here is the list you can choose any one out of these.
NORTHERN REGIONAllahabad university, AllahabadAwadesh pratap singh university, rewaBarkatullah vishwavidhyalaya, BhopalMahatma Gandhi gramodaya vishwavidyala, chitrakut, satna, madhya pradeshUniversity of delhiGB Pant University of Agriculture and Technology, pantnagarGuru ghasidas university, bilaspurHimachal Pradesh university, shimlaJamia milia islamia, jamia nagar, new delhiUniversity of jammuJiwaji university, GwaliorUniversity of KashmirKurukshetra universityMaharishi dayanand university, rohtakPunjab university, chandigarhPunjab agriculture university, LudhianaPunjabi university, PatialaDevi ahilya vishwavidyalaya, indoreGuru jambheshwar university, hisarRani dingvati vishwavidyalaya, JabalpurMadhya Pradesh bhoj open university, BhopalUP rajarishi tandon open university, Allahabad
WESTERN REGIONBirla institute of technology and sciences, pilaniInternational institute of population sciences, MumbaiJadavpur University, CalcuttaGujrat vidhyapeeth, ahmedabadShivaji University, KolhapurTilak Maharashtra vidhayapeeth, puneUtkal University, bhubaneshwarDr. Hari Singh Gour Vishwavidhyalaya, sagarGujrat vidhyapeeth, ahmedabadSNDT womens University, Mumbai
EASTERN REGIONBerhanpur University,berhanpurPatna University, patnaBabasaheb bhimrao ambedkar bihar University, muzzafarpurUniversity of burdwan, bindwanGauhati University, guwahatiLalit narayan mithila University, darbhangaNorth eastern hill University, shillongSambalpur University, sambalpurVidyasagar University, mindnaporeNetaji subhash open university, Kolkata
SOUTHERN UNIVERSITY
Allagappa University, vishkhapatnamBangalore University, BangaloreBharatisadan University, tiruchirapalliCentral institute of English and foreign languages, hydrabadJawaharlal Nehru technology university, hydrabadPotti sreeramalu telagu University, hydrabadManonmaniam sundaranar University, mysoreTamil nadu agriculture university, CoimbatoreOsmania university, hydrabadUniversity of mysore, mysoreMother Teresa womens university, ChennaiMadurai kamraj university, MaduraiKakatiya University, Warangal
The university won't matter, as Ph.D will be through distance mode only.