Siriorn Boonyawanich. Development of microbial fuel cell as a sensor for analyzing quality of industrial wastewater. (). King Mongkut's University of Technology North Bangkok. Central Library. : , 2018.
Development of microbial fuel cell as a sensor for analyzing quality of industrial wastewater
Noted:
Grant Source King Mongkut's University of Technology North Bangkok 2018
Abstract:
The membrane less, single chamber microbial fuel cell (SCMFC) was applied for
measuring the polluted concentrations as a biosensor. Heat pretreated microbial seed
was enriched and acclimated in a small volume of SCMFCs for two months. The
SCMFCs were activated using different concentrations of wastewater to evaluate the
relationship between COD concentrations with current outputs and the performance
of the SCMFCs. The results showed that current outputs could be detected according
to the synthetic wastewater (SW) concentrations from 25-1,000 mgCOD/L. There was
the best correlation between COD concentrations with current outputs at 150
mgCOD/L. (R2=0.92) and the substrate removal efficiency was approximately 90 %.
When the SCMFCs were fed with the distillery wastewater (DW), the results indicated
that current outputs could be detected according to DW concentrations from 50-2,000
mgCOD/L. There was the best correlation between COD concentrations with current
outputs at 1,200 mgCOD/L. (R2=0.97) and the substrate removal efficiency was
approximately 60 %. Moreover, the research demonstrated the high repeatability of
current outputs and regeneration ability after long starvation period in the distillery
wastewater. Therefore, this SCMFCs is a device used for electricity generation and
accomplished wastewater treatment.
The influence of the high concentration of wastewater on the power generation
and wastewater treatment in the SCMFCs was investigated. The results showed that
the maximum current density was 2.36 mA/m-2 and power density was 39.21 mW/m-3
with an optimum concentration at 2,000 mgCOD/L of the DW. However, the current
and power density were lower than the SW (152.5 mA/m-2 and 207.29 mW/m-3) with
an optimum concentration at 3,500 mgCOD/L. The maximum soluble COD removal
was 90.7 % (CE = 1.72 %, 1,500 mgCOD/L) of the SW and 62.2 % (CE = 8.77 %, 1,500
mgCOD/L) of the DW, respectively. The microbial communities on the anode and the
cathode biofilms fed with the high concentration of the DW (4,000 mgCOD/L) operation
were analyzed based on 454 pyrosequencing of the 16S rRNA gene by next generation
sequencing technology. The results showed the dominant phylum of Proteobacteria
(29%), Bacteroidetes (23%), Chlorobi (23%) and Firmicutes (9%) on the anode biofilm.
The microbial community of the cathode biofilm was mainly similar to that on the
anode in relation to Chlorobi (30.9%), Bacteroidetes (26.6%), Proteobacteria (25.9%)
and Firmicutes (4.6%).