J 2019

Biostimulation enhanced the biotic degradation of hexabromocyclododecane in sediments

DEMIRTEPE, Hale a Ipek IMAMOGLU

Základní údaje

Originální název

Biostimulation enhanced the biotic degradation of hexabromocyclododecane in sediments

Autoři

DEMIRTEPE, Hale (792 Turecko, garant, domácí) a Ipek IMAMOGLU (792 Turecko)

Vydání

Journal of Soils and Sediments, Heidelberg, Springer Heidelberg, 2019, 1439-0108

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10511 Environmental sciences

Stát vydavatele

Německo

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Impakt faktor

Impact factor: 2.763

Kód RIV

RIV/00216224:14310/19:00110464

Organizační jednotka

Přírodovědecká fakulta

DOI

UT WoS

000473687600020

Klíčová slova anglicky

Biodegradation; Bioremediation; Flame retardant; Hexabromocyclododecane; Sediment

Štítky

Příznaky

Mezinárodní význam, Recenzováno
Změněno: 24. 3. 2020 11:44, Mgr. Marie Šípková, DiS.

Anotace

V originále

PurposeThe aim of this study was to investigate biodegradation of -hexabromocyclododecane (-HBCDD) under conditions mimicking three bioremediation strategies: (i) biostimulation: addition of sodium formate and ethanol to stimulate biodegradation as the carbon source and electron donor, respectively; (ii) bioaugmentation: addition of an enrichment culture of Dehalobium chlorocoercia strain DF-1; and (iii) natural attenuation: no amendments. To differentiate between biotic and abiotic mechanisms affecting -HBCDD degradation, four control microcosms were set up as sterile, negative, abiotic, and contaminant control.Materials and methodsSediment microcosms were prepared in 20-mL bottles and operated as duplicate sacrificial reactors with a sediment-to-liquid ratio of 3g wet solid:3.5mL liquid. Total incubation time was 36days with sampling every 4days, except the last day. -HBCDD contents of sediments were extracted using ultrasonication and analyzed using GC-MS. Four control microcosms were used to observe the effect of (i) microbial activity (sterilization with mercuric chloride and autoclaving), i.e., sterile; (ii) microbial culture without DF-1 cells, i.e., negative control; (iii) sediments, where kaolinite is used instead of sediments, i.e., abiotic control; and (iv) -HBCDD, where no analyte is added, i.e., contaminant control.Results and discussionBiostimulation showed the highest -HBCDD biodegradation rate (k=0.0542day(-1)) and enhanced biodegradation compared to natural attenuation (k=0.0155day(-1)). Bioaugmentation (k=0.0123day(-1)) with DF-1 strain showed a sharp decrease at the beginning, but could not maintain this trend afterwards. Paired comparison of microcosms yielded no statistically significant difference between bioaugmentation and natural attenuation; hence, DF-1 strain did not improve degradation when compared to natural attenuation. This was also substantiated by observations from the negative control set. Sterile and abiotic control sets showed no significant concentration change in time. Consequently, adsorption was not considered as a significant mechanism acting on -HBCDD concentration change in our sediment microcosms. Thus, -HBCDD decrease observed in bioremediation microcosms was attributed to microbial activity.ConclusionsWe reported effective analyte degradation with biostimulation. This was the first study to test bioaugmentation for HBCDD degradation, but we observed no enhancement of degradation with the DF-1 strain tested. Previous studies observed HBCDD reduction in their sterilized controls, hence reported total biotic and abiotic degradation rate. In this study, comparative evaluation of three test and four control microcosms enabled identification of only anaerobic biodegradation rates for -HBCDD, providing useful information for bioremediation of contaminated sites.