Performance of an internal circulating three-phase fluidized bed bioreactor in treating petrochemical wastewater

Citation
Xl. Wu et al., Performance of an internal circulating three-phase fluidized bed bioreactor in treating petrochemical wastewater, ENV TECHNOL, 20(3), 1999, pp. 269-275
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
ENVIRONMENTAL TECHNOLOGY
ISSN journal
0959-3330 → ACNP
Volume
20
Issue
3
Year of publication
1999
Pages
269 - 275
Database
ISI
SICI code
0959-3330(199903)20:3<269:POAICT>2.0.ZU;2-L
Abstract
A 4.75 m(3) volume pilot internal circulating three-phase fluidized bed bio reactor (ICTFBB) was developed to treat petrochemical wastewater With ceram ic particles as biocarriers. In situ experimental results showed that: due to its higher content of extracellular polymer and filamentous microbes, co llapsed biofilm was better than activated sludge as inoculum for new biofil m to build up and for the ICTFBB to start up. When influent total COD, oil, phenol, NH4-N and PO4-P concentrations were in the:range of 353-1911 mg l( -1), 11.6-55.7 mg l(-1), 1.57-48.7 mg l(-1), 10.1-53.5 mg l(-1) and 2.3-5.4 mg l(-1) respectively, average removal efficiencies of them were 75.9%, 75 .3%, 92.8%, 40% and 87.2%, respectively. Average total COD removal rates we re in the range of 6.6-10.4 kgCOD m(-3) d(-1), much higher than that of the control, the conventional activated sludge reactor, 1.28-2.5 kgCOD m(-3) d (-1). Oxygen utilization efficiency was high as 14-22% in ICTFBB, higher th an that of the control, 6-10%. Air supply was much lower in the ICTFBB. In addition, the ICTFBB had higher resistance to COD and phenol shock and ran more stable than the control.