Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 287, Issue -, Pages 252-258Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.01.055
Keywords
Nitrobenzene; Co-substrate; Biodegradation; Photolysis; Intimate coupling
Categories
Funding
- National Natural Science Foundation of China [50978164]
- Key project of basic research in Shanghai [11JC1409100]
- Special Foundation of Chinese Colleges and Universities Doctoral Discipline [20113127110002]
- Special Fund of State Key Joint Laboratory of Environment Simulation and Pollution Control [13K09ESPCT]
- United States National Science Foundation [0651794]
Ask authors/readers for more resources
Photo(cata)lysis coupled with biodegradation is superior to photo(cata)lysis or biodegradation alone for removal of recalcitrant organic compounds. The two steps can be carried out sequentially or simultaneously via intimate coupling. We studied nitrobenzene (NB) removal and mineralization to evaluate why intimate coupling of photolysis with biodegradation was superior to sequential coupling. Employing an internal circulation baffled biofilm reactor, we compared direct biodegradation (B), biodegradation after photolysis (P + B), simultaneous photolysis and biodegradation (P&B), and biodegradation with nitrophenol (NP) and oxalic acid (OA) added individually and simultaneously (B + NP, B + OA, and B + NP + OA); NP and OA were NB's main UV-photolysis products. Compared with B, the biodegradation rate P + B was lower by 13-29%, but intimately coupling (P&B) had a removal rate that was 10-13% higher; mineralization showed similar trends. B + OA gave results similar to P&B, B + NP gave results similar to P + B, and B + OA + NP gave results between P + B and P&B, depending on the amount of OA and NP added. The photolysis product OA accelerated NB biodegradation through a co-substrate effect, but NP was inhibitory. Although decreasing the UV photolysis time could minimize the inhibition impact of NP in P + B, P&B gave the fastest removal of NB by accentuating the co-substrate effect of OA. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available