文献类型：期刊文献

中文题名：释氧复合剂强化沉积物中萘的生物降解研究

英文题名：Study on the enhanced biodegradation of naphthalene in the sediment by an oxygen-releasing preparation

作者：杨洁[1];华丹芸[1];林逢凯[1];胥峥[1];杨磊[2]

机构：[1]华东理工大学资源与环境工程学院,上海200237;[2]华东理工大学化学与分子工程学院,上海200237

年份：2013

卷号：13

期号：5

起止页码：35

中文期刊名：安全与环境学报

外文期刊名：Journal of Safety and Environment

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

语种：中文

中文关键词：环境工程学;释氧复合剂;沉积物;萘

外文关键词：environmental engineering; oxygen-releasing prepara-tion; sediment ; naphthalene

摘要：利用一种新型的释氧复合剂强化沉积物中萘的生物降解。结果表明,随沉积物中萘质量比增加,微生物的脱氢酶活性逐渐降低,当萘质量比超过58.0μg/g干泥时,萘对微生物具有显著的抑制作用。在受萘污染沉积物的原位修复过程中,释氧复合剂能够有效提高沉积物-水界面的氧化还原电位(ORP)。当ORP保持在100 mV以上时,沉积物表层由缺氧状态转变为好氧状态。同时,受萘污染的沉积物中微生物的生理活性提高。经过29 d的修复,脱氢酶活性为初始值的58.6倍,远大于对照组的3.5倍和空白组的5.6倍,微生物对萘的降解能力显著增强。沉积物中萘的生物降解符合一级反应动力学,降解速率常数为0.038 d-1,明显大于对照组的0.022 d-1。
This study intends to provide a new oxygen-releasing preparation agent made of peroxide calcium, active carbon and poly- mer to enhance the biodegradation of naphthalene in the sediment. For the purpose of further application, we have determined the effects of naphthalene on the biological activity of microbe in the sediment. The results indicate that the dehydrogenase activity of microbe would decline when the naphthalene content of the sediment increased. And, when the naphthalene content of the sediment became lowerthan 25.0 μg/g dry, the dehydrogenase activity of the microbe would be slightly affected by the naphthalene. However, since the dehydro- genase activity of the microbe was restrained significantly by the naphthalene with the naphthalene content being over 58.0 μg/g dry, its activity would deline by over 50%. In the in-situ remediation process of the sediment contaminated by naphthalene, the oxygen-re- leasing preparation tends to be kept on the surface of the sediment, with the naphthalene content being 63.6 μg/g dry in the test sample, and 58.3 μg/g dry in the control and 7.4μg/g dry in the blank. For the remediation test to be done during a period of 29 days, the results indicate that the oxygen-releasing preparation proves to be able to im- prove the oxidation-reduction potential （ORP） of the sediment-water interface when the ORP was kept over 100 mV. Therefore, the sur- face layer of the sediment was likely to turn from anoxic to aerobic condition gradually. Moreover, the microbial physiological activity in the sediment was expected to be improved evidently. As compared with 3.5 times in the control and 5.6 times in the blank, the dehy- drogenase activity of the microbe would increase by 58.6 times in the test sample and as a result, the biodegradation of naphthalene in the sediment would be in turn greatly strengthened. The biodegradation kinetics of naphthalene in the sediment has thus proved to be consis- tent with the first-order reaction. Therefore, the biodegradation rate constant of naphthalene is thus expected to be raised remarkably, with 0.038 d-1 in the test sample and 0.022 d-1 in the control.