Induced metal redistribution and bioavailability enhancement in contaminated river sediment during in situ biogeochemical remediation
作者： Tongzhou Liu , Zhen Zhang , Yanqing Mao , Dickson Y. S. Yan
DOI: 10.1007/S11356-015-5842-3
关键词: Bioavailability 、 Biostimulation 、 Pollutant 、 Environmental chemistry 、 Organic matter 、 Chemistry 、 Biogeochemical cycle 、 Environmental remediation 、 Sulfide 、 Total organic carbon
摘要: In situ sediment remediation using Ca(NO3)2 or CaO2 for odor mitigation and acid volatile sulfide (AVS) organic pollutant (such as TPH PAHs) removal was reported in many studies fieldwork. Yet, the associated effects on metal mobilization potential distortion bioavailability were not well documented. this study, contaminated river treated by bench studies. Through investigation of AVS removal, matter changes oxidation-reduction (ORP), microbial activity, other indigenous parameters, bioavailability, bioaccessibility, fraction redistribution evaluated. The major mechanisms are biostimulation with denitrifying bacteria chemical oxidation, respectively. After applying CaO2, decreases concentrations insignificant within a 35-day incubation period. However, [SEMtot-AVS]/f OC increased near to effective boundary toxicity (100 μmol g(-1) carbon (OC)), indicating that both bioaccessibility metals (Cu, Zn, Ni) benthic organisms enhanced after remediation. Metals found redistributed from relatively stable fractions (oxidizable residual fractions) weakly bound (exchangeable reducible fractions), results line bioavailability. Compared Ca(NO3)2, led higher enhancement more significant redistribution, probably due its stronger reactive capacity matter. reactions CaO2-treated would shift physicochemical biochemical heterotrophic oxidation degradation. Therefore, further long-term mobility is recommended.
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