Autotrophic denitrification and its effect on metal speciation during marine sediment remediation
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| Titel: | Autotrophic denitrification and its effect on metal speciation during marine sediment remediation |
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| Autoren: | Zhang, T, Fang, HHP, Shao, M |
| Quelle: | Water Research. 43:2961-2968 |
| Verlagsinformationen: | Elsevier BV, 2009. |
| Publikationsjahr: | 2009 |
| Schlagwörter: | 0301 basic medicine, Geologic Sediments, Nitrogen, Remediation, Autotrophic denitrification, 01 natural sciences, Metals, Heavy - analysis - metabolism, Environmental, Zinc - analysis - metabolism, 03 medical and health sciences, Nitrogen - chemistry - metabolism, Metals, Heavy, Nitriles, Heavy - analysis - metabolism, Sequential extraction, 14. Life underwater, Geologic Sediments - analysis - chemistry - microbiology, 0105 earth and related environmental sciences, Nitrates - chemistry, Autotrophic Processes, Nitrates, Nitriles - chemistry, Lead - analysis - metabolism, 6. Clean water, Zinc, AVS–SEM, Biodegradation, Environmental, Heavy metals, Lead, Metals, 13. Climate action, Biodegradation, Copper - analysis - metabolism, Copper |
| Beschreibung: | Denitrification-based remediation has been proved as a cost-effective approach for organic removal in sediment. However, little attention has been drawn on the concomitant autotrophic denitrification process and its impacts during such treatment. In this study, a contaminated marine sediment sample was treated with nitrate in a series of experiments to characterize the autotrophic denitrification and its impacts on metal speciation. Through treatment, as the consequence of autotrophic denitrification which accounts for 73.9% of nitrate reduction, approximately 98.8% acid volatile sulfide (AVS) was oxidized to sulfate, causing changes of Zn, Cu and Pb speciation in the sediment. Their oxidizable fractions decreased by 71.7%, 13% and 71% respectively while the bound-to-carbonate fractions increased by 52.0%, >700% and >40%, and the reducible fractions also increased by 276%, >280% and 140%. Thus, the relatively stable oxidizable phase of Zn, Cu and Pb was generally transferred to the more mobile bound-to-carbonate and reducible phases. According to SEM (simultaneously extracted metal) analysis, most of extractable Zn and Pb were no longer present in the form of metal sulfides after denitrification. The (Zn+Pb)/AVS ratio increased from 0.030 to 3.1. Both sequential extraction and AVS-SEM suggested a possible increase of heavy metal mobility and, thus, toxicity. Two major species responsible for autotrophic denitrification were identified to be phylogenetically related with Sulfurimonas paralvinellae and Thiohalophilus thiocyanoxidans. |
| Publikationsart: | Article |
| Sprache: | English |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2009.04.016 |
| Zugangs-URL: | https://pubmed.ncbi.nlm.nih.gov/19476962 https://pubmed.ncbi.nlm.nih.gov/19476962/ https://www.cabdirect.org/cabdirect/abstract/20093188877 https://www.ncbi.nlm.nih.gov/pubmed/19476962 https://hub.hku.hk/handle/10722/124538 https://www.sciencedirect.com/science/article/pii/S0043135409002474 https://core.ac.uk/display/37950090 http://hdl.handle.net/10722/124538 |
| Rights: | Elsevier TDM |
| Dokumentencode: | edsair.doi.dedup.....4a78c0ccae0316d47ffea7f26698e8ca |
| Datenbank: | OpenAIRE |
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Nájsť tento článok vo Web of Science | Abstract: | Denitrification-based remediation has been proved as a cost-effective approach for organic removal in sediment. However, little attention has been drawn on the concomitant autotrophic denitrification process and its impacts during such treatment. In this study, a contaminated marine sediment sample was treated with nitrate in a series of experiments to characterize the autotrophic denitrification and its impacts on metal speciation. Through treatment, as the consequence of autotrophic denitrification which accounts for 73.9% of nitrate reduction, approximately 98.8% acid volatile sulfide (AVS) was oxidized to sulfate, causing changes of Zn, Cu and Pb speciation in the sediment. Their oxidizable fractions decreased by 71.7%, 13% and 71% respectively while the bound-to-carbonate fractions increased by 52.0%, >700% and >40%, and the reducible fractions also increased by 276%, >280% and 140%. Thus, the relatively stable oxidizable phase of Zn, Cu and Pb was generally transferred to the more mobile bound-to-carbonate and reducible phases. According to SEM (simultaneously extracted metal) analysis, most of extractable Zn and Pb were no longer present in the form of metal sulfides after denitrification. The (Zn+Pb)/AVS ratio increased from 0.030 to 3.1. Both sequential extraction and AVS-SEM suggested a possible increase of heavy metal mobility and, thus, toxicity. Two major species responsible for autotrophic denitrification were identified to be phylogenetically related with Sulfurimonas paralvinellae and Thiohalophilus thiocyanoxidans. |
|---|---|
| ISSN: | 00431354 |
| DOI: | 10.1016/j.watres.2009.04.016 |