White rot fungus Pleurotus pulmonarius enhanced bioremediation of highly PCDD/F-contaminated field soil via solid state fermentation.
Sci Total Environ
; 738: 139670, 2020 Oct 10.
Article
em En
| MEDLINE
| ID: mdl-32534283
ABSTRACT
This study was performed to evaluate the use of white rot fungus, Pleurotus pulmonarius, to treat polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) in contaminated soil using solid state fermentation (SSF). The soil was collected from a long-closed pentachlorophenol plant in southern Taiwan. The non-sterilized soil with a total PCDD/F concentration of 14,000⯱â¯2400â¯ng I-TEQ kg-1 was mixed directly with the solid fungal inocula at dry w/w ratio of 11.4 (ratio-adjusted test) and incubated at 26⯱â¯2⯰C in a controlled environment. The highest PCDD/F decomposition was observed during the mycelium colonization. Pearson correlation coefficient (r) studied during this period (35â¯days) indicated that laccase had no significant correlation (râ¯=â¯-0.53), while manganese peroxidase had a strong positive correlation (râ¯=â¯0.88) with PCDD/F decomposition efficiency. After 72â¯days, the more toxic congeners, tetra- and penta-CDD/Fs were removed to non-detectable levels. Meanwhile, the removal efficiencies of hexa-, hepta-, and octa-CDD/Fs were >80%, >97%, and >90%, respectively. The simultaneous degradation of low and high chlorinated DD/Fs suggested that overall removal was nonspecific. The overall PCDD/F removal was 96%, and the residual concentration (276â¯ng I-TEQ kg-1) was below the regulatory control limit (1000â¯ng I-TEQ kg-1). In conclusion, this study shows that P. pulmonarius via SSF can successfully remediate the PCDD/F-contaminated field soil. Furthermore, this SSF technique overcame the well-known intractability of PCDD/F biodegradation in non-sterilized soil, making it promising for actual field application.
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Base de dados:
MEDLINE
Assunto principal:
Poluentes do Solo
/
Benzofuranos
/
Pleurotus
/
Dibenzodioxinas Policloradas
País como assunto:
Asia
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article