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研究生: 陳彥旻
Chen, Yan-Min
論文名稱: 生物性透水性反應牆共代謝處理三氯乙烯之研究
Cometabolic Treatment of Trichloroethylene in Groundwater by Permeable Reactive Biobarrier
指導教授: 林財富
Lin, Tsair-Fuh
學位類別: 博士
Doctor
系所名稱: 工學院 - 環境工程學系
Department of Environmental Engineering
論文出版年: 2008
畢業學年度: 96
語文別: 英文
論文頁數: 202
中文關鍵詞: 三氯乙烯透水性反應牆地下水生物復育共代謝動力模式緩釋氧物質
外文關鍵詞: Bioremediation, PRB, Cometabolism, Kinetic model, Groundwater, Oxygen release compound, Trichloroethylene
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  • 本研究利用Pseudomonas putida (BCRC 14349),進行酚代謝分解與三氯乙烯共代謝分解,以評估生物性透水性反應牆生物復育處理地下水中三氯乙烯之可行性。本研究首先建立酚與三氯乙烯之動力模式,繼而利用幾丁聚醣包埋微生物,進行固定化微生物酚代謝分解與三氯乙烯共代謝分解之動力分析,並比較懸浮態與固定化培養之效益比較分析,進而評估進一步應用於作為生物性透水性反應牆填充材質之可行性。最後,為增加地下水中之溶氧,本研究進行幾丁聚醣包埋過氧化鎂作為地下水中緩釋氧物質之可行性研究。
    酚與三氯乙烯之動力模式研究中,本研究利用一包含細菌生長/分解、分解能力失活、基質競爭與抑制等機制之動力模式,由不同之批次實驗分開求得固有之在動力參數,成功的用於預測酚與三氯乙烯之動力,並將此模式與故有之未含基質抑制之模式相比較。當三氯乙烯濃度小於2 mg/L時,未包含基質抑制之模式與包含基質抑制之模式之間並無明顯之差異,但當三氯乙烯濃度大於6 mg/L時,僅包含基質抑制之模式能成功預測三氯乙烯之降解動力。本模式亦成功的預測連續批次之酚與三氯乙烯降解分析實驗。實驗結果顯示,當三氯乙烯濃度小於2 mg/L時,前一批次中被抑制之細菌能百分百的回復酚與三氯乙烯之降解能力。然而,當三氯乙烯濃度大於6 mg/L時,其酚與三氯乙烯之降解能力未能百分百的回復。
    利用幾丁聚醣固定化微生物於酚與三氯乙烯之代謝研究中,可由掃瞄式電子顯微鏡看出微生物可均勻的分佈於幾丁聚醣顆粒的內部與表面。降解實驗進行於100 mg/L 的酚污染物與0.2至20 mg/L的三氯乙烯污染物中。結果顯示幾丁聚醣固定化微生物與懸浮態微生物皆能有效的降解污染物,但幾丁聚醣固定化微生物能保護微生物於較高之三氯乙烯濃度下,有較高之降解能力(0.032 mg TCE/ mg phenol)。實驗結果也顯示pH值是影響酚與三氯乙烯分解之重要因子。由傅力葉轉換紅外線光譜(FTIR)分析可得知,幾丁聚醣為一富有胺基之聚合物,此胺基於酸性環境下帶有強烈正電,將影響包埋於幾丁聚醣內之微生物活性,也會於顆粒內部結構形成時,因不同之清洗液改變不同之顆粒結構與酚與三氯乙烯之降解特性。
    幾丁聚醣包埋過氧化鎂作為地下水中緩釋氧物質之可行性研究中發現,過氧化鎂粉末本身之釋氧將因為氫氧化鎂之生成增加水中之pH,系統中平衡之pH則取決於水質的緩衝能力。本研究已初步利用不同之幾丁聚醣與過氧化鎂之配比,形成幾丁聚醣包埋氧化鎂之物質,藉以緩釋水中溶氧,減少1/4至1/2倍之速率。由掃瞄式電子顯微鏡可看出幾丁聚醣與過氧化鎂反應形成一薄膜,包埋過氧化鎂於內部之釋氧物質,並且幾丁聚醣與過氧化鎂反應形成之薄膜也增加了釋氧物質之比表面積。利用研發之幾丁聚醣包埋過氧化鎂釋氧物質於管柱實驗中亦發現,其酚污染物之降解功效與商用之ORC®具有相同之速度(17 mg phenol/L/h),但其因具有可定形且水力傳導係數高之優點,值得後續加以研發。

    In this study, treatment of trichloroethylene (TCE) in contaminated groundwater was investigated using biological permeable reactive barriers (PRBs). A bacterium using phenol as the carbon and energy source, Pseudomonas putida, was employed for the cometabolic degradation of TCE. The bacterium was first investigation for its degradation kinetics of both phenol and TCE. Then, the bacterium was immobilized in chitosan beads for testing its feasibility as a PRB reactive media. Finally, an oxygen releasing material, chitosan immobilized magnesium peroxide was investigated for its applicability in PRB systems as an oxygen supplier.
    In the kinetic study for the cometabolic degradation of phenol and TCE, a new model was developed to simulate the experimental data. The model incorporated cell growth and decay, loss of transformation activity, competitive inhibition between growth substrate and non-growth substrate and self-inhibition of non-growth substrate was proposed to simulate the degradation kinetics of phenol and TCE by Pseudomonas putida. All the intrinsic parameters employed in this study were measured independently, and were then used for predicting the batch experimental data. The model predictions conformed well to the observed data at different phenol and TCE concentrations. At low TCE concentrations (< 2 mg/L), the models with or without self-inhibition of non-growth substrate both simulated the experimental data well. However, at higher TCE concentrations (> 6 mg/L), only the model considering self-inhibition can describe the experimental data, suggesting that a self-inhibition of TCE was present in the system. The proposed model was also employed in predicting the experimental data conducted in a repeated batch reactor, and good agreements were observed between model predictions and experimental data. The results also indicated that the biomass loss in the degradation of TCE below 2 mg/L can be totally recovered in the absence of TCE for the next cycle, and it could be used for the next batch experiment for the degradation of phenol and TCE. However, for higher concentration of TCE (> 6 mg/L), the recovery of biomass may not be as good as that at lower TCE concentrations.
    The degradability of phenol and TCE by Pseudomonas putida BCRC 14349 in both suspended culture and immobilized culture (the chitosan beads) systems are investigated in this study. Based on the SEM microphotos, the P. putida cells grew well on both the surface and interior of the immobilized media, and the cells were uniformly distributed in the whole bead. The degradation experiments showed that both the primary substrate, phenol, and cometabolic non-growth substrate, TCE, were able to degrade at the tested concentrations, phenol = 100 mg/L, and TCE = 0.2 - 20 mg/L. The effect of pH, between 6.7 and 10, on the degradation of both phenol and TCE may be neglected for the suspended culture system. However, for the immobilized culture system, phenol and TCE degradation were only observed at pH > 8. The different effect of pH on the degradation may be linked to the surface properties of the chitosan beads and its interaction on the activity of the bacteria.
    Bacteria immobilized in chitosan beads were also investigated for the effect of functional groups of the beads on the degradation of phenol in this study. The functional groups of chitosan beads forming in four different washing solutions were characterized with Fourier transform infrared (FTIR) transmission spectra. The FTIR spectra showed that the beads possess much OH groups and amine groups, and the abundance of these functional groups was affected by the washing solution used. Since the amine groups may change charge property at different pHs, the washing solutions are expected to have strong impact on the bacteria degradability. Experimental results indicated that the degradation kinetics of phenol strongly depends on the washing solution used, following the same order as the abundance of amine groups. It is expected that more abundance of amine groups at the pH tested would lead to more positively charges on the chitosan bead surface, causing inhibition of bacteria activity. In the degradation experiment, the degradation of TCE began only after the exhaustion of phenol, indicating that the competitiveness of phenol is larger than TCE. The maximum transfer yield of TCE was almost the same for the suspended and immobilized cultures (0.032 mg TCE/ mg phenol). However, the maximum transfer yields for suspended and immobilized systems occurred at different TCE concentrations. The transfer yield at higher TCE concentrations for the immobilized system may suggest that the cells immobilized in carriers were provided protection from harsh environmental conditions, and had a better tolerance to the toxicity of TCE.
    Oxygen released from magnesium peroxide and chitosan-immobilized oxygen release compound was studied for the dynamic at different solutions. It is observed that using MgO2 as the oxygen source will increase pH value, and the final equilibrium pH in the aquatic system depends on the buffer capacity of aquatic system. The dissolution of MgO2 and decomposition of H2O2 are both related to equilibrium pH in aquatic system and then affected the oxygen release kinetics in aquatic system. The oxygen release rates as well as the pH in the aqueous systems for the chitosan immobilized magnesium peroxide could be controlled through different manufacturing processes. Chitosan immobilized magnesium peroxide could reduce initial rate to ranges from 1/4 to 1/2 under different experimental conditions. The micro-morphology of the chitosan immobilized MgO2, using a scanning electron microscope, showed that the material is very porous. In addition, the surface area as well as diffusion resistance for oxygen transport through the chitosan beads was relevant to the manufacturing processes. This may be employed as a tool to control the release rate of oxygen. The chitsan-MgO2 beads were further studied in column experiments for testing the supply of oxygen in the degradation of phenol using the P. putida bacterium. The experiment was operated for 400 h. The data indicated a sustain degradability of phenol through the experiment. The degradation rate of column experiment was calculated as about 17 mg phenol/L/h, much larger than the control column experiment at only 2.9 mg phenol/L/h. This degradation rate is in equivalent to the data obtained from the column filled with sand and ORC® at about 17 mg phenol/L/h as well.

    Abstract (In Chinese) I Abstract III Acknowledgements VII Table of Contents IX List of Figures XIII List of Tables XIX Chapter Ⅰ Introduction 1 1.1 Background 1 1.2 Usage of trichloroethylene 1 1.3 Transport and treatment of trichloroethylene 3 1.4 Cometabolism 5 1.5 In-Situ permeable reactive barriers 8 1.6 Introduction to cell immobilization 9 1.7 Introduction to chitosan 10 1.8 Scope and objectives 12 1.9 Dissertation overview 13 Chapter Ⅱ Cometabolic degradation of trichloroethylene and phenol by Pseudomonas putida 25 2.1 Introduction 26 2.2 Material and methods 27 2.2.1 Chemicals 27 2.2.2 Microorganism and growth 28 2.2.3 Experiments for Phenol and TCE degradation 28 2.2.3.1 Experiments for individual phenol and TCE degradation 29 2.2.3.2 Experiments for simultaneous degradation of phenol and TCE 29 2.2.4 Repeated batch reactor experiment 30 2.2.5 Analytical methods 31 2.3 Results and discussion 33 2.3.1 Preliminary study 33 2.3.2 Individual phenol degradation 34 2.3.3 Individual TCE Degradation 34 2.3.4 Phenol and TCE degradation simultaneously at different ratios 35 2.3.5 Repeated batch reactor experiment 35 2.4 Summary 36 Chapter Ⅲ Modeling the cometabolic kinetics for trichloroethylene and phenol degradation by Pseudomonas putida 45 3.1 Introduction 46 3.2 Material and methods 47 3.2.1 Model Derivation 47 3.2.2 Parameter estimation 49 3.2.3 Experiments for Phenol and TCE degradation 52 3.2.4 Analytical methods 53 3.2.5 Sensitivity analysis 53 3.3 Results and discussion 54 3.3.1 Kinetic Parameter Determination 54 3.3.1.1 Parameters for phenol degradation 54 3.3.1.2 Endogenous decay coefficient 55 3.3.1.3 Parameters for TCE Degradation 56 3.3.1.4 True biomass transformation capacity ( ) 56 3.3.2 Prediction of phenol and TCE degradation at different TCE concentrations 57 3.3.3 Prediction of phenol and TCE degradation at different phenol concentrations 58 3.3.4 Cometabolic degradation in the repeated batch experiments 58 3.3.5 Modeling the kinetics 60 3.4 Summary: 61 Chapter Ⅳ Degradation of phenol and TCE using suspended and chitosan-bead immobilized Pseudomonas putida 75 4.1 Introduction: 76 4.2 Materials and methods: 79 4.2.1. Chemicals 79 4.2.2. Microorganism and growth 79 4.2.3. TCE degradation in suspension systems 80 4.2.4. TCE degradation in immobilized systems 81 4.2.5. Analytical methods 82 4.2.6. Kinetic analysis 83 4.3 Results and discussion 85 4.3.1. The SEM photos of chitosan beads 85 4.3.2. Effect of pH on phenol and TCE degradation 86 4.3.3. Degradability of phenol and TCE in suspended systems 87 4.3.4. Degradation of phenol and TCE in immobilized systems 89 4.3.5. Comparison of phenol and TCE degradation kinetics in the systems 91 4.4 Summary: 94 Chapter Ⅴ Effect of functional groups on the degradation of phenol using chitosan beads immobilized bacteria 107 5.1 Introduction 108 5.2 Materials and Methods 110 5.2.1 Chemicals 110 5.2.2 Microorganism and Growth 110 5.2.3 Manufacturing of Chitosan Beads 111 5.2.4 Analytical Methods 112 5.3 Results and discussion 113 5.3.1 The SEM photos of chitosan beads 113 5.3.2 Phenol degradation and intermediate production 114 5.3.3 Effect of washing solutions on phenol degradation kinetics 115 5.3.4 Surface properties and biodegradability 115 5.4 Summary 117 Chapter Ⅵ Using chitosan immobilized magnesium peroxide as an oxygen control release material in bioremediation 125 6.1 Introduction 126 6.2 Material and Methods 132 6.2.1 Chemicals 132 6.2.2 Manufacturing chitosan Immobilized MgO2 133 6.2.3 Column experiments 133 6.2.4 Analytical methods 135 6.3 Results and Discussion 136 6.3.1 Alkalinity of MgO2 in DI water 136 6.3.2 Effect of buffer capacity of the aquatic system 137 6.3.3 DO releasing and pH change in chitosan-MgO2 systems 139 6.3.4 Compare with different dry-chitosan-MgO2 formulas 140 6.3.5 SEM photography and Surface area analysis 141 6.3.6 Column experiments 142 6.4 Summary 143 Chapter Ⅶ Conclusions 155 Summary 155 Implications and Future Research Directions 157 Closing Remark 160 References 163 Appendix 177 A.1. Effect of NADH and formate 177 A.2. Repeated batch experiments of chitosan beads 180 A.3. Small pilot scale experiments 182 VITA 199

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