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Frontiers of Chemical Science and Engineering

Front. Chem. Sci. Eng.    2017, Vol. 11 Issue (3) : 338-345     DOI: 10.1007/s11705-017-1644-0
Removal of dyes from wastewater by growing fungal pellets in a semi-continuous mode
Tao Lu, Qilei Zhang, Shanjing Yao()
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
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To increase the efficiency of dye removal from wastewater using mycelial pellets, a bubble column reactor with a simple structure was designed and efficiently used to remove dyes from solution containing dyes. The mycelial pellets were prepared by marine fungus Aspergillus niger ZJUBE-1. Eight dyes were tested as dye targets for the adsorption capacity of mycelial pellets and good removal results were obtained. Eriochrome black T was selected as a model dye for characterizing the adsorption processes in detail. The measurement results of Zeta potential and FT-IR analysis indicate that the electrostatic attraction may play a key role in the biosorption process. The bubble column reactor was utilized to study the batch dye-removal efficiency of mycelial pellets. A re-culture process between every two batches, which was under non-sterile condition, successfully enhanced the utilization of mycelium biomass. The dye removal rate is 96.4% after 12 h in the first batch and then decreases slowly in the following batches. This semi-continuous mode, which consists of commutative processes of dye-removal and re-culture, has some outstanding advantages, such as low power consumption, easy operation, high dye removal rate, and efficient biomass utilization.

Keywords dye      mycelial pellets      marine fungus      bubble column reactor      semi-continuous biosorption     
Corresponding Authors: Shanjing Yao   
Just Accepted Date: 07 April 2017   Online First Date: 19 May 2017    Issue Date: 23 August 2017
 Cite this article:   
Tao Lu,Qilei Zhang,Shanjing Yao. Removal of dyes from wastewater by growing fungal pellets in a semi-continuous mode[J]. Front. Chem. Sci. Eng., 2017, 11(3): 338-345.
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Tao Lu
Qilei Zhang
Shanjing Yao
Fig.1  The Schematic diagram of the (a) running and (b) resting status of the bubble column reactor. The dimensions are (cm): a, 1; b, 9; c, 40; d, 6.5. The air inlet and two outlets are the same in size
Fig.2  The dye removal capacity of mycelial pellets for eight dyes
Fig.3  Effects of (a) initial dye concentrations and (b) average pellets diameters on dye removal rate
Fig.4  (a) Effects of initial pH values on dye removal rate; (b) the variation of zeta potential of mycelium: black solid squares represent control mycelium under different pH; hollow symbols represent mycelium that reached adsorption equilibrium in solutions of different EBT concentration at pH 3.0
Fig.5  FT-IR spectra of control mycelium and mycelium loaded with EBT
Fig.6  The process images of the first batch in the bubble column reactor: (a) reactor loaded with fresh mycelial pellets and EBT solution; (b) aeration start; (d) aeration for 12 h; (d) settling; (e) the end of the settlement
Fig.7  (a) Dye removal rate of ten batches in the bubble column reactor. Samples were taken at 0, 1, 2, 4, 7, 12 h of each batch. (b?e) The section image of lyophilized mycelial pellets after different reuse batches
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