Controlled Release of Nitrate and Sulfate to Enhance Anaerobic Bioremediation of Phenanthrene in Marine Sediments

详细信息    查看全文

• 作者：Yinjie J. Tang ; Shelly Carpenter ; Jody Deming ; and Barbara Krieger-Brockett
• 刊名：Environmental Science & Technology
• 出版年：2005
• 出版时间：May 1, 2005
• 年：2005
• 卷：39
• 期：9
• 页码：3368 - 3373
• 全文大小：206K
• 年卷期：v.39,no.9(May 1, 2005)
• ISSN：1520-5851

文摘

Experimental measurements demonstrated that rates of insitu microbial anaerobic biodegradation of phenanthrenein undisturbed marine sediments were enhanced whencontrolled-release electron acceptors (i.e., nitrate and sulfate(for comparison)) were employed. The experimentalmethod used whole and interval cores injected withradiolabeled ¹⁴C-phenanthrene, which were incubated,sacrificed, and processed for ¹⁴CO₂ recovery to determinedegradation rates. Nitrocellulose and CaSO₄ wereformulated to release the electron acceptors into thesediments at rates consistent with bacterial utilization (i.e.,that avoided inhibition observed previously at highsoluble nitrate (although not sulfate) concentrations). Thecontrolled-release of both compounds, measured incollateral experiments, enhanced the natural anaerobicphenanthrene biodegradation rates by factors up to 2-3.Biodegradation via sulfate reduction was most rapid in theearly stages (24 days) of experiments, consistent withreports that many marine bacteria in submerged sedimentsare sulfate reducers. In comparison, in longer experiments(after 42 days), the anaerobic biodegradation rateswere observed at least as high with the addition ofnitrocellulose (over 40% of added phenanthrene recoveredas ¹⁴CO₂). Both nitrate and sulfate reduction was observedduring anaerobic incubation, although the presence ofnitrate seemed to reduce the sulfate reduction. The studiedforms of the controlled-release nitrate and sulfate mayprovide capping amendments to decontaminate marine harborsediments.