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130424 https://hdl.handle.net/2286/R.I.27322 Pan, Shihui, Yan, Ning, Liu, Xinyue, Wang, Wenbing, Zhang, Yongming, Liu, Rui, & Rittmann, Bruce E. (2014). How UV photolysis accelerates the biodegradation and mineralization of sulfadiazine (SD). BIODEGRADATION, 25(6), 911-921. http://dx.doi.org/10.1007/s10532-014-9711-4 10.1007/s10532-014-9711-4 0923-9820 1572-9729 http://rightsstatements.org/vocab/InC/1.0/ 2014-11-01 2015-11-01T12:26:37 11 pages eng Pan, Shihui Yan, Ning Liu, Xinyue Wang, Wenbing Zhang, Yongming Liu, Rui Rittmann, Bruce Biodesign Institute Swette Center for Environmental Biotechnology This is the authors' final accepted manuscript. The final publication is available at http://dx.doi.org/10.1007/s10532-014-9711-4 Sulfadiazine (SD), one of broad-spectrum antibiotics, exhibits limited biodegradation in wastewater treatment due to its chemical structure, which requires initial mono-oxygenation reactions to initiate its biodegradation. Intimately coupling UV photolysis with biodegradation, realized with the internal loop photobiodegradation reactor, accelerated SD biodegradation and mineralization by 35 and 71 %, respectively. The main organic products from photolysis were 2-aminopyrimidine (2-AP), p-aminobenzenesulfonic acid (ABS), and aniline (An), and an SD-photolysis pathway could be identified using C, N, and S balances. Adding An or ABS (but not 2-AP) into the SD solution during biodegradation experiments (no UV photolysis) gave SD removal and mineralization rates similar to intimately coupled photolysis and biodegradation. An SD biodegradation pathway, based on a diverse set of the experimental results, explains how the mineralization of ABS and An (but not 2-AP) provided internal electron carriers that accelerated the initial mono-oxygenation reactions of SD biodegradation. Thus, multiple lines of evidence support that the mechanism by which intimately coupled photolysis and biodegradation accelerated SD removal and mineralization was through producing co-substrates whose oxidation produced electron equivalents that stimulated the initial mono-oxygenation reactions for SD biodegradation. Text How UV photolysis accelerates the biodegradation and mineralization of sulfadiazine (SD)