Naslov
Biodegradation of PS and PVC microplastics by Bacillus subtilis

Autori
Miloloža, Martina ; Bule, Kristina ; Prevarić, Viktorija ; Ružaj, Lucija ; Patrčević, Paula ; Cvetnić, Matija ; Ukić, Šime ; Bolanča, Tomislav ; Kučić Grgić, Dajana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
Food&Climate Changes

Mjesto i datum
Koprivnica, Hrvatska, 15.10.2021. - 16.10.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Microplastics, Biodegradation ; Polystyrene ; Poly(vinyl) chloride ; Bacillus subtilis

Sažetak
Nowadays, microplastic particles are one of the biggest pollutions and threats to the environment. These particles are found even in food, which is intended for human consumption. It has been proven by many scientists that MP particles have negative effects on plants and animals, and therefore on humans. The particles of MP are characterized by exceptional strength, high durability and resistance to external conditions and biodegradation. Although there are numerous studies showing different ways of their degradation, it is almost impossible to degrade them completely. One of the ways is biodegradation, which is the breakdown of polymers into monomers by microorganisms. It has been shown that particles of PS and PVC can be degraded by various bacteria. In this study, Bacillus subtilis were used for the degradation of PS and PVC particles. Biodegradation was tested on the basis of 7 factors – pH-value, temperature, agitation speed, size of MP particles, concentration of MP, optical density (OD) and addition of glucose, at two levels - minimum and maximum. During the experiment, total number of the living bacterial cells, CFU, total carbon, TC, total organic carbon, TOC, and inorganic carbon, IC, values, and concentrations of ions were monitored. The experimental results show increase of CFU values, as well as TOC and IC values which was related to decrease of ions concentrations. Accordingly, it was proved that the bacterial strain Bacillus subtilis have the ability to degrade PS and PVC particles, but it is of great importance to choose the right conditions for the highest efficiency.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo, Interdisciplinarne tehničke znanosti

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