活性碳吸附動物排放廢水溶解性有機質(DOM)螢光特徵探討

Investigation the fluorescence characteristics of dissolved organic matter (DOM) in animal wastewater effluent adsorbed by activated carbon

何紹碩(He Shaoshuo)

指導教授 ： 陳庭堅 ； 余伍洲

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2019年)

https://doi.org/10.6346/NPUST201900370

摘要

全世界面臨水資源的不足與惡化，因此穩定供水的再生水是重要的選擇。廢水處理廠放流水再生與回收是重要的項目。而處理再生水中薄膜技術是已被採用的可靠處理方法，但膜結垢仍然是限制薄膜過濾進一步廣泛應用的阻礙關鍵，薄膜的積垢導致通水量降低，因此增加操作成本。膜的積垢和隨後的清潔導致薄膜材料劣化，滲透水品質降低，最終導致膜壽命縮短。
本研究為了減少DOM引起濾膜積垢，利用活性碳預處理豬廢水處理廠放流水。利用螢光特徵探討放流水溶解性有機質(DOM)化學組成與結構經預處理後的變化。試驗參數含活性碳粒徑、原水過濾方式、震盪時間、震盪頻率、活性碳材質與劑量。試驗結果顯示原水過濾與否與震盪時間對DOM移除效率不是主要的因素；活性碳的種類、粒徑、劑量和震盪頻率是移除DOM主要的參數。三種光學指標(A254/A204、A250-400、SUVA254)與劑量和不同分子量大小、震盪時間有顯著的關係。三種指標皆隨著試驗條件的變化而有所改變。從螢光強度百分率發現DOM組成的改變與分子量和活性碳的材質有關。比較等溫吸附模式和吸附動力學的k值得知活性碳種類的吸附效率為卡爾岡>椰殼>煤質。

關鍵字

溶解有機質 ； 活性碳預處理 ； 螢光特徵 ； 等溫吸附模式

並列摘要

The world faces the shortage and deterioration of water resources. Therefore, the reclaimed water that stabilizes the water supply is an important issue. Wastewater effluent recycling and reuse is an important choice. The membranes technology has been adopted in reclaimed water and is a reliable treatment method. However, membrane fouling is still the key point to limit the further extensive use of membrane filtration. The membrane fouling causes a decrease in the amount of water flowing, thus increasing the operating cost. The membrane fouling and subsequent cleaning result in degradation of the membrane materials that the permeated water quality decrease and ultimately a reduction in the membrane life.
In order to reduce the fouling of the membrane caused by DOM, this study used activated carbon to pretreat the pig wastewater treatment plant effluent. The fluorescence characteristics were used to investigate the chemical composition and structure of the dissolved organic matter(DOM) and evaluation the change of DOM after pretreatment. The purpose is expect prolonging the life of the membrane. The test parameters include activated carbon particle size, raw water filtration mode, shacking time, shacking frequency, activated carbon material and dosage. The test results shown that the filtration of raw water and the shacking time were not the main factors for DOM removal efficiency. However, the type, particle size, dose of activated carbon as well as shacking frequency were the main parameters for removing DOM. The three optical indicators (A254/A204, A250-400, SUVA254) were significantly related to the dose and the molecular weight and shacking time. All three indicators have changed with the change of test conditions. The change in DOM composition was found to be related to the molecular weight and the material of the activated carbon from the percent fluorescence intensity. Comparing the k values of the isothermal adsorption mode and the adsorption kinetics, it was found that the adsorption efficiency of the activated carbon materials was Calgon > Coconut > Coal.

並列關鍵字

dissolved organic matter ； activated carbon pretreatment ； fluorescent characteristics ； isothermal adsorption mode

參考文獻

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