利用人工濕地及光催化處理水中有機質和四環黴素

Treatment of Organic Matters and Tetracycline in Water by Using Constructed Wetland and Photocatalysis

阮氏秋紅(Nguyen Thi Thu Hong)

指導教授 ： 陳冠中

國立屏東科技大學/國際學院/土壤與水工程國際碩士學位學程/碩士(2015年)

https://doi.org/10.6346/NPUST.2015.00292

摘要

本實驗中，以土砂礫石為基礎的人工濕地模型上，種植輪傘莎草，主要目的是為了測試其移除水中有機物以及四環素類抗生素的能力。為了測試人工溼地的性能，以主要化合物的初始濃度及水力的停留時間做為評估依據。實驗結果顯示，以連續流動一天為保留時間的條件下，達成了水中有機物皆下降的比率，UV 254由55.2％變為80.8％、DOC由28.1％變為71.9％、sCOD由72.1％變79.7％。人工溼地若是搭配較高的初始有機濃度則會有更好的移除比率，而此結果顯示，人工溼地在含有大量有機物的水處理中，具有良好的前瞻性。此外，本文實驗數據指出，以一天為水力滯留時間的移除比率與以兩天為水力滯留時間的除比率極為相似。然而，為了移除氨在水中的比率，水力滯留的時間則擔任非常重要的角色。本實驗指出，當水力滯留時間從一日變為兩日時，氨含量的移除比率大幅上升，從61.7％變為73.0％。結果顯示，為了擁有完整的實驗結果，人工溼地需要較長的時間。人工溼地同時也顯示較佳的四環素類抗生素移除比率，特別是在運作時最初的兩個小時具有更佳的結果。最後，非常重要的一點，為了提高出水水質，本文以光觸媒作為後處理，流出的水質有明顯進步的趨勢。光觸媒反應器上裝有兩盞紫外
線a段燈，其中所發出的波長介於315~400奈米；光觸媒使用了20公克的二氧化鈦/α-氧化鋁。縱使出水水質尚有改進的空間，然而，相較於單一的人工溼地系統，組合系統移除比率還是較小。因此，為了增強組合系統，未來研究將致力於人工溼地以及光催化氧化的結合。本文的主要目的在於，使用低成本的儀器，來測試並降低水中有機物以及四環素類抗生素的成分的可能性。

關鍵字

人工溼地 ； 有機物質 ； 四環素類抗生素 ； 移除比率 ； 水力滯留時間 ； 光催化 ； 水質

並列摘要

In this study, constructed wetland (CW) established with a matrix of soil, sand together with gravel and planted with Cyperus involucratus was used to investigate the ability to remove organic matters (OMs) and tetracycline (TC) in water. The performance of CW was evaluated by varying initial concentrations of target compounds and hydraulic retention times (HRTs). Overall, OMs removal efficiencies of 55.2 - 80.8%, 28.1 - 71.9% and 72.1 - 79.7% for UV 254, DOC and sCOD, respectively, were achieved under continuous flow condition after a retention time of 1 day. Performance of CW with higher initial DOC concentration achieved better removal efficiencies, indicating that CW is a promising system in treating water with high amount of OMs. Furthermore, the removal efficiency of OMs in HRT-1day was nearly similar to that in HRT-2day which was recorded from this study. However, HRT played an important role in removal of ammonia in this experiment. The removal efficiency of NH3-N increased considerably from
61.7% to 73.0% with the change of HRT from 1 day to 2 days, resulting in the fact that the removal of ammonia in water by using CW needs a long time to get the complete treatment. CW also showed an excellent performance in removing TC in water, especially in the first two hours of the operating period through absorption process. Last but not least, with the expectation of using photocatalysis as the post treatment to improve the water quality in the effluent after CW treatment, the findings of this research showed an improvement in effluent water quality, presented by the increase in removal efficiency of OMs of combined system compared to that of CW alone. The photocatalytic reactor equipped with two UVA lamps, which emitted radiation wavelength between 315 nm and 400 nm, and photocatalyst used in this experiment was TiO2/ α-Al2O3 with an amount of 20 g. Although there was an enhancement in effluent water quality, the increase in removal efficiency of combined system compared to that of CW alone was a minor. Therefore, further research on combination of CW and photocatalytic oxidation needs to be done to enhance the performance of this combined system. Despite the fact that further tests are required to get the better results, this study points to the possible application of these low cost water treatment systems for dealing with OMs and TC in water.

並列關鍵字

Constructed wetland ； Organic matters ； Tetracycline ； Removal efficiency ； HRT ； Photocatalysis ； Water quality

參考文獻

Agui, W., Tamura, S., Abe, M., and Ogino, K. (1992). Removal of Dissolved Humic Substances from Water with a Reverse Osmosis Membrane. Science of the Total Environment, 117, 543-550.

Akratos, C. S., and Tsihrintzis, V. A. (2007). Effect of Temperature, HRT, Vegetation and Porous Media on Removal Efficiency of Pilot-Scale Horizontal Subsurface Flow Constructed Wetlands. Ecological Engineering, 29(2), 173-191.

American Public Health Association (APHA), American Water Works Association, and Water Environment Federation. (1998). Standard Methods for the Examination of Water and Wastewater. Washington, DC.

An, J., Jho, E. H., and Nam, K. (2015). Effect of Dissolved Humic Acid on the Pb Bioavailability in Soil Solution and Its Consequence on Ecological Risk. Journal of Hazardous Materials, 286, 236-241.

Antoniadis, A., Takavakoglou, V., Zalidis, G., Darakas, E., and Poulios, I. (2010). Municipal Wastewater Treatment by Sequential Combination of Photocatalytic Oxidation with Constructed Wetlands. Catalysis Today, 151(1), 114-118.