University of Novi Sad, Faculty of Sciences, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia.
University of Novi Sad, Faculty of Sciences, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia.
J Environ Manage. 2018 May 15;214:9-16. doi: 10.1016/j.jenvman.2018.02.029. Epub 2018 Mar 5.
Due to the anaerobic nature of aquatic sediments, the anaerobic treatment of sediments utilizing already present microflora represents an interesting treatment option. Contaminated sediment can contain a variety of organic contaminants, with easily degradable organics usually present in the higher amounts, along with traces of specific organic pollutants (total petroleum hydrocarbons and polycyclic aromatic hydrocarbons). This study applies a comprehensive approach to contaminated sediment treatment which covers all the organic contaminants present in the sediment. The aim of this study was to (1) evaluate the anaerobic treatment of aquatic sediment highly loaded with easily degradable organics via determination of potential biogas and methane production, and (2) assess possibilities of using anaerobic treatment for the degradation of specific organic pollutants in order to reduce the risks posed by the sediment. In order to promote the methanogenic conditions of the indigenous microflora in the sediment, the addition of co-substrates acetate and glucose was investigated. The results, expressed as mL biogas produced per volatile solids content in sediment (VS) indicate that the addition of the co-substrate has a significant impact on biogas production potential (58.7 and 55.1 mL/g VS for acetate and glucose co-substrate addition respectively, and 14.6 mL/g VS for the treatment without co-substrate addition). Theoretical biochemical methane potential was assessed by Gompertz model and Chemical oxygen demand model. The Gompertz model fit better for all the applied treatments, and was capable of predicting the final productivity of biogas and methane in the first 30 days with a relative error of less than 14%. From the aspects of specific organic pollutants, total petroleum hydrocarbon degradation was promoted by co-substrate addition (degradations of 75% and 60% achieved by acetate and glucose co-substrate addition, compared to 45% for the treatment without co-substrate addition). Polycyclic aromatic hydrocarbons were reduced by significant amounts (84-87%) in all the applied treatments, but the addition of co-substrate did not further improve their degradation.
由于水生沉积物的厌氧性质，利用已存在的微生物群落对沉积物进行厌氧处理代表了一种很有吸引力的处理选择。受污染的沉积物可能含有各种有机污染物，其中易降解有机物通常含量较高，同时还存在特定有机污染物（总石油烃和多环芳烃）的痕迹。本研究采用综合方法处理受污染的沉积物，涵盖了沉积物中存在的所有有机污染物。本研究的目的是：（1）通过测定潜在的沼气和甲烷产量，评估高度富含易降解有机物的水生沉积物的厌氧处理；（2）评估厌氧处理用于降解特定有机污染物的可能性，以降低沉积物带来的风险。为了促进沉积物中土著微生物群落的产甲烷条件，研究了添加共底物乙酸盐和葡萄糖的效果。结果以每挥发性固体含量（VS）产生的毫升沼气表示，表明共底物的添加对沼气产生潜力有显著影响（分别为添加乙酸盐和葡萄糖共底物时为 58.7 和 55.1 mL/g VS，而不添加共底物时为 14.6 mL/g VS）。通过 Gompertz 模型和化学需氧量模型评估理论生物甲烷潜力。Gompertz 模型更适用于所有应用的处理方法，能够在最初 30 天内以相对误差小于 14%预测沼气和甲烷的最终产率。从特定有机污染物的角度来看，共底物的添加促进了总石油烃的降解（与不添加共底物的处理相比，添加乙酸盐和葡萄糖共底物时的降解率分别达到 75%和 60%）。多环芳烃在所有应用的处理方法中都有显著减少（84-87%），但添加共底物并不能进一步提高它们的降解率。
