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|Other Titles: ||Remoal of Metals (Sb, Mo, In) by Chemical Coagulation and Adsorption Processes in Drinking Water Treatment|
|Keywords: ||銻;鉬;銦;粒狀氫氧化鐵;粉末活性碳;混凝劑;化學混凝;吸附;antimony;molybdenum;Indium;granular ferric hydroxide;powdered activated carbon;coagulant;coagulation;adsorption|
|Issue Date: ||2012-05-02 10:11:09 (UTC+8)|
|Abstract: ||我國環保署為推動安全飲用水，定期檢討並修訂飲用水水質標準，於2008年修訂銻標準維持於0.10 mg/L，於2009年增訂鉬、銦標準皆為0.07 mg/L。鉬、銦汙染源主要為高科技產業放流水排放，目前僅我國飲用水水質標準管制銦項目，銻管制值亦較先進國家(0.05 ~ 0.06 mg/L)寬鬆。回顧淨水處理技術評估，金屬砷鉛研究多；相對地，銻、鉬、銦處理技術資訊相當不足，鐵鹽混凝可去除銻，但鋁鹽混凝無法去除。本研究於實驗室配製含銻、鉬、銦之地表水與地下水人工原水，探討”淨水程序化學混凝與吸附去除金屬(銻、鉬、銦)之研究(1/2)”，計畫分二年度，第一年探討(1) 化學混凝去除鉬、銦，與(2) 吸附程序去除銻。化學混凝採用瓶杯試驗，以金屬(鉬、銦)濃度、pH、混凝劑加藥量與種類(氯化鐵、硫酸鋁、多元氯化鋁) 及前加氯氧化等為操作變數、探討其對化學混凝去除鉬、銦之影響。吸附實驗採等溫吸附實驗及動力吸附實驗，實驗操作變數為吸附劑加藥量與種類(活性碳、錳砂、粒狀氫氧化鐵)、pH、銻濃度與化學物種(3價與5價)及吸附接觸時間，以Freundlich與Langmuir等溫吸附公式及Lagergren rate方程式檢討操作變數對吸附程序去除銻之影響。第二年度探討吸附程序去除鉬、銦，吸附實驗及操作變數與第一年相同。|
The Environmental Protection Administration, Taiwan has periodically reviewed and emended the regulations to drinking water for safe and health concern. In 2008, the standard to antimony (Sb) concentration was 0.10 mg/L, while molybdenum (Mo) and indium (In) were both freshly set to 0.07 mg/L an year after. The Mo and In contaminated water are mainly drained from high-tech industries, however, regulations of In is emended in Taiwan only. The regulation of Sb (0.01 mg/L) is looser than that in developed countries (0.05-0.06 mg/L). By reviewing water treatment technologies, removal of arsenic (As) and lead (Pb) from drinking water were well mentioned; oppositely, removal of Sb, Mo, In were scarcely informed. Sb could be removed by ferric coagulation process while it is difficult to remove by aluminum coagulation. The objectives to this proposal are to remove Sb, Mo, In from artificial water in order to mimic the condition either in surface or ground water especially on “Removal of metals (Sb, Mo, In) by chemical coagulation and adsorption processes in drinking water treatment”. This proposal is a two-year project. In the first year, we will focus on (1) removal of Mo/In by chemical coagulation, and (2) removal of Sb by adsorption process. The experiments will be carried out by Jar-test of chemical coagulation process and the operational variables are those on initial concentration of Mo/In, pH, the dosage and varieties of coagulant (ferric chloride, aluminum sulfate, poly-aluminum chloride) and pre-chloride oxidation for understanding the effects of coagulation on removal of Mo/In from water. The adsorption experiments will be conducted by either isotherm or kinetic adsorption and the operational variables are those on the dosage and varieties of adsorbent (activated carbon, manganese sand and granular ferric hydroxide), pH, initial concentration of Sb (III, V) and adsorption contact time for evaluating the effects on Sb removal by analyzing data through Freundlich or Langmuir isotherm, and Lagergren rate equation as well. In the second year, we will evaluate the adsorption process to remove Mo/In from water. The conditions and variables will be the same as the adsorption tests in the first year.
|Appears in Collections:||[水資源及環境工程學系暨研究所] 研究報告|
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