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. 2021 Sep 2;6(36):23515-23527.
doi: 10.1021/acsomega.1c03560. eCollection 2021 Sep 14.

Study on Start-Up Membraneless Anaerobic Baffled Reactor Coupled with Microbial Fuel Cell for Dye Wastewater Treatment

Na Liu  1 , Yanbin Yun  1 , Liming Hu  1 , Linting Xin  1 , Mengxia Han  1 , Panyue Zhang  1
Affiliations

Study on Start-Up Membraneless Anaerobic Baffled Reactor Coupled with Microbial Fuel Cell for Dye Wastewater Treatment

Na Liu et al. ACS Omega. .

Abstract

In this study, the antitoxicity performance of the traditional anaerobic baffled reactor (ABR) and the newly constructed membraneless anaerobic baffled reactor coupled with microbial fuel cell (ABR-MFC) was compared for the treatment of simulated printing and dyeing wastewater under the same hydraulic residence time. The sludge performances of ABR-MFC and ABR were evaluated on the dye removal rate, extracellular polymer (EPS) content, sludge particle size, methane yield, and the surface morphology of granular sludge. It was found that the maximum power density of the ABR-MFC reactor reached 1226.43 mW/m3, indicating that the coupled system has a good power generation capacity. The concentration of the EPS in the ABR-MFC reactor was about 3 times that in the ABR, which could be the result of the larger average particle size of sludge in the ABR-MFC reactor than in the ABR. The dye removal rate of the ABR-MFC reactor (91.71%) was higher than that of the ABR (1.49%). The methane production and microbial species in the ABR-MFC system were higher than those in the ABR. Overall, the MFC embedded in the ABR can effectively increase the resistance of the reactor, promote the formation of granular sludge, and improve the performance of the reactor for wastewater treatment.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
ABR-MFC reactor schematic diagram.
Figure 2
Figure 2
Power density of each cell of ABR-MFC (a), output voltage of ABR-MFC (b), chemical oxygen demand (COD) of each cell of ABR-MFC and ABR (c), dye concentration change diagram of each cell of ABR-MFC and ABR (d), and relative removal rate of COD in each chamber of ABR-MFC and ABR (e).
Figure 3
Figure 3
Protein (a), humic acid (b), polysaccharide (c), and ratio of protein to polysaccharide (d) of ABR-MFC and ABR.
Figure 4
Figure 4
(a–d) EEM fluorescence spectrum study of the sludge SMP in the ABR. (e–h) EEM fluorescence spectrum study of sludge SMP in the ABR-MFC reactor.
Figure 5
Figure 5
(a–d) EEM fluorescence spectrum study of sludge LB-EPS in the ABR. (e–h) EEM fluorescence spectrum study of the sludge LB-EPS in the ABR-MFC reactor.
Figure 6
Figure 6
(a–d) EEM fluorescence spectrum study of sludge TB-EPS in the ABR. (e–h) EEM fluorescence spectrum study of sludge TB-EPS in ABR-MFC reactor.
Figure 7
Figure 7
(a–d) SEM images of granular sludge in the ABR from the first compartment to the fourth compartment. (e–h) SEM images of granular sludge in the ABR-MFC reactor from the first compartment to the fourth compartment.
Figure 8
Figure 8
Sludge particle size distribution of activated sludge in chamber 1 to chamber 4 of the ABR and the ABR-MFC reactor.
Figure 9
Figure 9
Methane production (a) and pH changes (b) in the ABR and ABR-MFC reactor from compartments 1 to 4.
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