Effect of H2 on reductive transformation of p-ClNB in a combined ZVI-anaerobic sludge system.
Using a combined zero-valent iron (ZVI) and anaerobic sludge system as the platform, the hydrogen utilization and reductive mechanism of p-chloronitrobenzene (p-ClNB) were investigated in the study. Results showed that the corrosion of ZVI could be used as a source of electron donor for anaerobic microorganisms, and then enhanced reductive transformation of p-ClNB and production of methane. Thereinto, the transformation of p-ClNB was observed to have priority for the utilization of H(2). The enhancement factors (Q') for the reductive transformation of p-ClNB with exogenous H(2), reduced ZVI (RZVI), industrial ZVI (IZVI), and nanoscale ZVI (NZVI) as electron donors were 4.1-5.6, 14.8-35.1, 2.8-4.6, and 1.5-5.7, respectively. Results demonstrated that RZVI was the most effective type of electron donors, which was attributed to the production and utilization of H(2)/[H] simultaneously via the ZVI corrosion and microbial metabolism. It is hopeful for the application of ZVI to enhance the reductive transformation of analogous persistent organic pollutants in the anaerobic sludge system.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
Liang
L
Zhu
Hai-zhuan
HZ
Lin
Jiao-qin
JQ
Qi
Xiang-yang
XY
Xu
Han-ying
HY
Qi
D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D003343:Corrosion; D006859:Hydrogen / Q000378:metabolism*; D007501:Iron / Q000737:chemistry / Q000378:metabolism*; D008697:Methane / Q000737:chemistry / Q000378:metabolism; D009578:Nitrobenzenes / Q000737:chemistry* / Q000378:metabolism; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism
D009578:Nitrobenzenes; D012722:Sewage; D014874:Water Pollutants, Chemical; D006859:Hydrogen; C010407:4-chloronitrobenzene; D007501:Iron; D008697:Methane