?url_ver=Z39.88-2004&rft_id=10.3390%2Fsu13094874&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Heng&rft.au=Heng%2C+G.C.&rft.aufirst=G.C.&rft.volume=13&rft.issn=20711050&rft.issue=9&rft.atitle=Process+optimization+of+waste+activated+sludge+in+anaerobic+digestion+and+biogas+production+by+electrochemical+pre-treatment+using+ruthenium+oxide+coated+titanium+electrodes&rft.title=Sustainability+(Switzerland)&rft.date=2021&rft.genre=article