| 研究生: |
謝汶興 Hsieh, Wen-Hsing |
|---|---|
| 論文名稱: |
2-MIB與Geosmin在土壤-水系統分佈及淨水程序之處理研究 Distribution of 2-MIB and Geosmin in Soil-Water System and Their Treatment in Waterworks |
| 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: | 2013 |
| 畢業學年度: | 101 |
| 語文別: | 英文 |
| 論文頁數: | 106 |
| 中文關鍵詞: | 自來水 、臭味 、2-MIB 、Geosmin 、脫水效應 、pH 、Freundlich模式 、等溫吸附線 |
| 外文關鍵詞: | Drinking water, odor, 2-MIB, Geosmin, dehydration;pH;Freundlich model, adsorption isotherm |
| 相關次數: | 點閱:218 下載:5 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
摘要
自來水中藻類代謝物為重要水質議題,其中2-Methylisoborneol (2-MIB) 及 trans-1,10-dimethyl-trans-9-decalol (geosmin)在為常見水中臭味的化學物質,在低濃度即可聞到味道,對自來水供水舒適性影響很大。為提升水中臭味物質之控制,良好之分析方法及對水系統的分布的了解,可以進步提升2-MIB及geosmin的控制。
本研究首先探討分析2-MIB及geosmin時,受pH值之影響、及其改善方法,以提升分析精準性。研究中針對固相微萃取、吹氣捕集及液向萃取等三種濃縮技術運用於2-MIB及geosmin之分析,發現水中之2-MIB及geosmin濃度與pH值相關。該兩種化合物在酸性條件下易引起脫水作用,pH值愈低、影響越明顯。在pH值5以下,分析結果開始明顯產生偏差,利用固相微萃取、吹氣捕集及液向萃取等濃縮技術,在pH值為2.5的條件下所得到的分析結果,相較於中性條件(pH=6~7)分別降低為87%, 16%, and 37%。研究亦顯示,分析結果與pH值變化的路徑無觀,顯示2-MIB及geosmin之脫水效應為可逆,可藉由調整pH值保障其分析準確性。
本研究亦對金門太湖及榮湖等兩座傳統流程淨水廠之原水及流程水取樣分析發現,金門水系統中,2-MIB較geosmin出線機率及濃度均高出許多,74%之原水及32%之處理水中2-MIB之濃度均高於閾值(~10 ng/L),另外亦發現水體中的2-MIB大約70%均以溶解相存在。原水中的藍綠細菌在加氯6.4mg/L接觸15分鐘後,藍綠細菌的細胞會出現破裂。另外浮除程序可以有效去除藍率細菌且去除率大約為77-79%,但2-MIB在浮除之前的程序去除率僅17-28%,乃受限於細胞內的2-MIB較少所致。對於兩座淨水廠之快濾程序對2-MIB之去除率僅23-47%,亦可能為生物降解效應所致。有關此兩座淨水廠對2-MIB之總去除效率大約為74%,證實金門飲用水及處理水中2-MIB為臭味之主要來源,而濃度現有的處理程序已無法再使濃度降至閾值下,後續須由淨水高級處理程序負擔。
研究中亦初步探討兩種臭味物質在3種土壤、及1種底泥之吸附特性,研究結果顯示其吸附量與有機質含量有明顯相關,雖無法直接以線性關係與有機質含量相連結,可以以Freundlich等溫線描述。
關鍵辭:自來水、臭味、2-MIB、Geosmin、脫水效應、pH、Freundlich模式、等溫吸附線
Abstract
Cyanobacteria in drinking water sources and in recreational waters have received increasing attention worldwide because of their adverse effects on water quality. Not only cyanobacteria themselves are toxin producers, but also they may produce noxious metabolites, including taste and odor (T&O) substances. The two earthy-musty odorants, i.e., trans-1,10-dimethyl-trans-9-decalol (geosmin) and 2-methyl-isoborneol (2-MIB), are probably most frequently detected in drinking water systems. These two compounds can be detected by human noses at very low (~ ng/L) levels, deteriorating human perception to the water. To better control the two odorants, precise detection methods and understand their occurrence and fate in drinking water systems is therefore very important.
The effects of pH on the analysis of the two chemicals and method to mitigate the impact were first investigated. A gas chromatograph and mass spectrometric detector (GC/MSD) coupled with three preconcentration methods, namely solid-phase microextraction (SPME), purge-and-trap concentration (PTC), and liquid–liquid extraction (LLE), was employed for the analysis. Experimental results indicated that at neutral and alkaline pH conditions, the concentrations detected for both compounds remain constant. However, a substantial reduction of concentration for both chemicals is observed when the water solution pH is less than 5. Under acidic conditions (pH≅2.5), the 2-MIB concentrations detected by GC/MSD coupled with SPME, PTC, and LLE are 87%, 16%, and 37% lower than those measured at pH 6–7, respectively. The pH-dependent behavior was attributed to dehydration of the tertiary alcohols of 2-MIB and geosmin under acidic conditions. The dehydration for 2-MIB and geosmin is reversible, and the analysis can be mitigated by adjusting the water solution pH back to a neutral condition.
The occurrence and treatment of the two earthy-musty odorants was also investigated at two conventional drinking water treatment plants (WTPs) in Kinmen Island, Taiwan. Samples of the source, processed, and finished waters and tap water at the two WTPs were collected and analyzed. Both geosmin and 2-MIB were commonly detected in most water samples, with the 2-MIB concentration much higher than the geosmin concentration. About 74% of the source water samples and 32% of the finished and tap water samples showed detected 2-MIB levels higher than the odor threshold concentration (OTC, ~10 ng/L). Sampling and analysis of the reservoir water indicated that 2-MIB is uniformly distributed in the reservoir, with ~70% of which existing in the dissolved phase. The chlorination study of the raw water indicates that both geosmin and 2-MIB are resistant to chlorine. However, the cyanobacterial cells in raw water were effectively ruptured within 15 minutes of the contact time when a chlorine dosage of 6.4 mg/L was applied at the WTPs. A monitoring of the processed water at WTPs shows that flotation process is most effective to the removal of cyanobacteria, with about 77-79% efficiency, compared to ~99.4% achieved with the whole treatment train. Removal of 2-MIB by the treatment processes before flotation was only about 17-28%, which may be limited to the low ratio of cell-bound 2-MIB. The two sand filtration processes removed 23-47% of 2-MIB, due probably to the biological degradation of dissolved 2-MIB. For the two WTP studied, the removal of 2-MIB was about 74%. It is shown that 2-MIB is a major odorant in the drinking water source and the finished water in Kinmen Island. The current processes are not sufficient to remove 2-MIB to a level below the OTC. Advanced processes are needed to effectively remove the odorant.
Adsorption of 2-MIB and geosmin is also investigated for three soils and one sediment. Preliminary results show that the capacity for the two odorants onto the tested soils increased with increasing soil organic content (SOM). However, no linear relationship can be established between SOM and corresponding capacity. Instead, Freundlich isotherm equations may be used to describe the distribution of the two odorants between soils/sediments and water.
Keywords: Drinking water, odor, 2-MIB, Geosmin, dehydration;pH;Freundlich model, adsorption isotherm
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