Abstract
Aim of the study: This study aims to develop the novel model of multi-electrode MFC with the termite-associated yeast G. reessii for MG decelorization and electricity generation. Material and methods: The termite-associated yeast G. reessii was inoculated into modified midia with 150 mg/L MG. The laccase activity and MG removal was studied. Then, the G. reessii was immobilized on anode surface. The electrical properties and color removal were tested. Results and conclusions: The results showed it successfully removed the MG with 98.15±0.92% within 1 day of operation. Moreover, the OCV, CD and PD of 550.00±10.00%, 3.90±0.10 A/m3 and 1.52±0.08 W/m3 were achieved. Therefore, the system could have the potential for treatment of high concentration MG contaminated wastewater and produce a bio-electric energy.
Highlights
Laccase (EC 1.10.3.2) is a well-known multi-copper oxidase enzyme, containing oxidoreductase that is industrially important and environmentally friendly
Microbe and Culture Conditions The G. reessii, a laccase producing yeast was used for the degradation and decolourisation of malachite green
The results showed that the yeast G. reessii can growth in modified broth supplemented with 150 mg/L Malachite green (MG)
Summary
Laccase (EC 1.10.3.2) is a well-known multi-copper oxidase enzyme, containing oxidoreductase that is industrially important and environmentally friendly. Lack of stability because of activity loss is another factor limiting a possible scale-up (Ba et al, 2013; Fernandez et al, 2013; Asgher et al, 2014; Kudanga and Le Rose-Hill, 2014; Pezzella et al, 2015; Yang et al, 2017) Native termites and their microbes are spread throughout the broad area of both African and Asian continents, because these areas are rich in high-potential soil invertebrates (Taprab et al, 2002; Senanayake et al, 2016). DOI: lignocellulolytic enzymes for wood decaying for termite nutrition and orientation to food materials (Cornelius et al, 2002) These microbes can degrade the composition of the biomass substrate to insect feeding and detoxify the toxic compound, such as lignin present in plant tissues, through the action of lignin degrading enzyme like extracellular laccase (Chaijak et al, 2017; Senanayake et al, 2016)
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