Zinc and copper supplements enhance trichloroethylene removal by Pseudomonas plecoglossicida in water.
Environ Technol
; 44(24): 3698-3709, 2023 Oct.
Article
en En
| MEDLINE
| ID: mdl-35451932
ABSTRACT
The effects of two microelements, zinc and copper, on the aerobic co-metabolic removal of trichloroethylene (10â
mg/L) by the isolate Pseudomonas plecoglossicida were investigated. The strain was previously isolated from a petroleum-contaminated site using toluene (150â
mg/L) as substrate. Different concentrations (1, 10 and 100â
mg/L) of microelements provided with SO42- and Cl- were tested. The results showed the supplement of Zn2+ and Cu2+ at the low concentration (1â
mg/L) significantly enhanced cell growth. The removal efficiencies for toluene and trichloroethylene were also enhanced at the low concentration (1â
mg/L) of Zn2+ and Cu2+. Compared to the control without zinc supplement, higher concentrations of zinc (10 and 100â
mg/L) enhanced the removal efficiencies for both toluene and trichloroethylene in the first three days but showed some inhibitory effect afterward. However, the higher concentrations of Cu2+ (10 and 100â
mg/L) always showed inhibitory to the toluene removal while showing inhibitory to the TCE removal after three days. For both Zn2+ and Cu2+, the anions SO42- and Cl- did not show significant difference in their effects on the toluene removal. A possible mechanism for Zn2+ and Cu2+ to enhance the removal of toluene and trichloroethylene would be their involvement in toluene oxygenase-based transformation processes. In addition, high concentrations of Zn2+ and Cu2+ ions could be removed from the liquid by the cells accordingly. The results imply a potential of supplementing low concentrations of zinc and copper to enhance bioremediation of the sites co-contaminated with toluene and trichloroethylene.
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Bases de datos:
MEDLINE
Asunto principal:
Tricloroetileno
Idioma:
En
Revista:
Environ Technol
Año:
2023
Tipo del documento:
Article