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Title: Modelling simultaneous removal of trichlorfon and glucose in a hybrid bioreactor containing magnetically immobilized biomass
Authors: Chen, Guang Hao
Ozaki, Hiroaki
Terashima, Yutaka
Keywords: Simultaneous removal of trichlorfon and glucose
Hybrid bioreactor
Mathematical modelling
Suspended biomass
Magnetically immobilized biomass
Issue Date: 1998
Citation: Water science and technology, v. 38, no. 4-5, pt. 4, 1998, p. 179-186
Abstract: Trichlorfon is one of the representative organophosphate insecticides widely used in a argricultural and veterinary practices. Due to toxic and carcinogenic characteristics of the residues in the environment, remediation of such residues is necessary. To biodegrade trichlorfon effectively, a source of easily biodegradable substrates is needed for fulfilling the co-metabolism requirement of trichlorfon-removing bacteria. This paper focused on a simultaneous removal of trichlorfon and the glucose added as the source of the substrate. A hybrid bioreactor consisting of suspended and magnetically immobilized biomass was employed to study the removal efficiencies of both the substances. A mathematical model was developed in this paper in order to extensively evaluate the removal performance of both the biomass under various removal conditions. Comparisons between model predictions and experimental results showed that the proposed model was able to satisfactorily predict the simultaneous removal efficiency of trichlorfon and glucose in the hybrid bioreactor. This study also indicated that the suspended biomass plays a more important role in removing both the substances than the immobilized biomass when the trichlorfon- and glucose-removing bacteria completely coexist in both the biomass phases. To increase the removal contribution of the immobilized biomass, the hybrid bioreactor is recommended to deal with such complex wastewaters that contain much slowly biodegradable pollutants having a high diffusivity.
Rights: Water Science and Technology © copyright (1998) Elsevier. The Journal's web site is located at
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