以動態模式評估無氣泡氧氣溶解裝置應用於處理底泥多環芳香族化合物之效益

Assessing the Effectiveness of Bubble-free Oxygen Dissolution Apparatus on the Degradation of Sediment-bound Polycyclic Aromatic Hydrocarbons by Kinetic Modeling

莊霈德(Pei-Te Chuang)

指導教授 ： 洪慶宜

長榮大學/健康科學學院/職業安全與衛生學系(所)/碩士(2012年)

https://doi.org/10.6833/CJCU.2012.00165

摘要

底泥多環芳香族化合物(PAHs)對底棲生態有潛在性的風險，底泥微生物分解PAHs將受溶氧濃度所影響，以局部增氧技術來促進生物處理效率被認為是具有潛力的整治方式。
本研究以實驗室批式試驗估算在低溶氧(<1mg/L)、飽和溶氧(8mg/L)及過飽和溶氧(>30mg/L)三種條件下，二仁溪底泥中添加的Pheanthrene、Pyrene及Benzo[a]pyrene的消失速率常數，並據以建構系統動力模式模擬運用無氣泡氧氣溶解裝置處理受PAHs嚴重污染底泥的效益。
模擬結果顯示，三倍於生態風險值受PAHs的污染底泥，飽和溶氧時需1.3天、過飽和溶氧時需1.2天的處理時間，能讓底泥PAHs降至中低生態風險以下，而低溶氧狀態下無法下降至中低生態風險值以下。本研究結論局部增氧能有效促進PAHs的降解，可作為底泥污染整治的工法選擇。

關鍵字

多環芳香族化合物 ； 生物處理 ； 無氣泡氧氣溶解裝置 ； 底泥 ； 動力模式

並列摘要

Sediment-bound polycyclic aromatic hydrocarbons (PAHs) pose potential ecological risks to benthic organisms. The biodegradation of PAHs in sediment is affected by dissolved oxygen concentration in water column. Activating the aerobic microbial community using a patented Bubble-free Oxygen Dissolution Apparatus, that allows dissolution of high oxygen concentrations into water, may be a promising technique to encourage bioremediation of organic contaminants in sediment.
In this study, laboratory batch experiment was conducted to derive loss rate constants of pheanthrene, pyrene, and benzo[a]pyrene spiked onto sediments collected from Erhjin River under low (<1mg/L), saturated (8mg/L), and oversaturated (>30mg/L) dissolved oxygen conditions. Sediment-bound PAH dynamic model, based on the loss rates and chemical parameters collected in the laboratory-scale batch study, was established to evaluate the effectiveness of the Bubble-free Oxygen Dissolution Apparatus.
The simulation results showed that PAHs with the contamination levels as high as three times of the Effect Range-Median need 1.3days to drop below the medium-low ecological risk criteria under saturated dissolved oxygen conditions, while the treatment time cuts down to 1.2 days upon the application of the Bubble-free Oxygen Dissolution Apparatus. Low dissolved oxygen condition, however, cannot bring down the PAH concentration down to the safety level. The study demonstrated that the Bubble-free Oxygen Dissolution Apparatus can effectively stimulate PAH losses from benthic environment and can be a potential technology for remediation of persist organic pollutants in sediment.

並列關鍵字

PAHs ； bioremediation ； Bubble-free Oxygen Dissolution Apparatus ； sediment ； dynamic model

參考文獻

Aronstein, B. N., Y. M. Calvillo, M. Alexander. (1991). "Effect of surfactants at low concentrations on the desorption and biodegradation of sorbed aromatic compounds in soil." Environmental Science & Technology 25(10): 1728-1731.

Behymer, T. D. and R. A. Hites (1985). "Photolysis of polycyclic aromatic hydrocarbons adsorbed on simulated atmospheric particulates." Environmental Science & Technology 19(10): 1004-1006.

Bjøseth, A. and T. Ramdahl (1987). Handbook of polycyclic aromatic hydrocarbons, vol. 2 : Emission Sources and Recent Progress in Analytical Chemistry. M. Dekker, New York, 1985 (ISBN 0-8247-7442-6). 416 pp.

Boopathy, R. (2000). "Factors limiting bioremediation technologies." Bioresource Technology 74(1): 63-67.

Butler, J. D. and P. Crossley (1981). "Reactivity of polycyclic aromatic hydrocarbons adsorbed on soot particles." Atmospheric Environment (1967) 15(1): 91-94.