林正芳2006-07-262018-06-282006-07-262018-06-282002-07-31http://ntur.lib.ntu.edu.tw//handle/246246/22088淨水污泥產量日益大，將減少最終處 置場所之使用年限，故本研究將淨水污泥 經燒結程序再利用，本研究之研究內容為 以電子顯微照相、X 光繞射分析、比表面 積測定及表面酸鹼滴定法來探討淨水污泥 在高溫下燒結之晶表面特性;並以SO4 2-、 MoO4 2-、SeO4 2-、Hg(Ⅱ)、Cr(Ⅲ)等離子進 行平衡吸附實驗及競爭吸附實驗，輔以表 面錯合模式模擬，以探討燒結產物與離子 間之界面反應。 實驗結果顯示淨水污泥中以SiO2 含 量最高佔54%，其次為Al2O3 及Fe2O3， 其餘成分均低。燒結產物經由電子顯微照 相、X 光繞射分析及比表面積測定，發現 淨水污泥中主要的結晶相為SiO2，且隨溫 度增加而有減少之趨勢。淨水污泥經燒結 後結構更為緻密，在1000～1100℃燒結溫 度、成型壓力1～3 噸、延時0.5～1.5 小時 之操作條件下，比表面積為2～5 m2/g。因 燒結物之SiO2 含量大於50%，表面位址多 屬帶負電之位址，不利於吸附陰離子。 而以溫度1000℃、成型壓力2 噸、延 時1.5 小時之燒結粉末進行平衡吸附實 驗，結果顯示燒結物對陰離子SO4 2-、 MoO4 2-、SeO4 2-之吸附效果皆低，陽離子 之吸附率隨pH 值上升而增大，於pH = 4.8 時對Cr(Ⅲ)之吸附容量為1.40 mg/g 燒結物，Cr(Ⅲ)之吸附不受背景電解質影響， 為內層吸附離子;於pH = 6.0 時對Hg(Ⅱ) 之吸附容量為0.43 mg/g 燒結物，Hg(Ⅱ) 受背景電解質影響，為外層吸附離子。 Cr( Ⅲ ) 與燒結物之吸附競爭力大於 Hg(Ⅱ)。基於平衡吸附實驗結果，以三層 模式模擬結果發現Cr(Ⅲ)以Cr3+內層雙鉤 及CrOH+內層單鉤吸附於燒結物表面，反 應之固有平衡常數pKint 分別為3.5 及 7.7;Hg(Ⅱ)以HgOH+外層雙鉤吸附於燒結 物表面，固有平衡常數pKint 為-3.75。Daily generation of water industry sludge account is increasing yearly. The final disposal of the waste water sludge becomes a severe burden for both the administration and the environment. Therefore, the study applies sintering technology to convert water sludge to a useful and stable adsorption material. The properties of the sintered materials were characterized using SEM, XRD, BET and acid –base titration. In addition, adsorption experiments in conjunction with TLM simulation were employed for SO4 2-, MoO4 2-, SeO4 2-, Cr(Ⅲ) and Hg(Ⅱ) interactions at thewater/sintered materials interface. The elemental analysis of original water sludge shows the major constituents as SiO2 (54%), Al2O3 (21%) and Fe2O3 (6.6%). The SEM and XRD analyses on sintered materials also reveal that SiO2 is the principle compound of the matrix. The crystallized SiO2 decreases as sintering temperature increases. BET measurements gave the specific surface of 2 ~ 5 m2 per gram sintered materials. As composition of SiO2 is more than 50%, surface of the sintered materials become negatively charged. The adsorption effect of SO4 2- 、 MoO4 2- 、SeO4 2- is not significant. Adsorption of Cr(Ⅲ) and Hg(Ⅱ) on the sintered materials show that sorption is dependent on system’s pH. The sorption densities are 1.40 mg Cr/g at pH 4.8 and 0.43 mg Hg/g at pH 6.0. Sorption of Cr(Ⅲ) is unaffected by solution electrolyte. However, sorption of Hg(Ⅱ) is significantly affected by solution electrolyte. Affinity of Cr(Ⅲ) for the surface reacting sites seem to out-compete Hg( Ⅱ ). Simulation of the experimental results by TLM has revealed that Cr3+ forms inner-sphere bidentate complexes and CrOH2+ forms monodentate complexes. The intrinsic adsorption constants (pKint) for Cr3+ and CrOH2+ are 3.5 and 7.7, respectively; and for Hg(Ⅱ) as out-sphere complex is -3.75.application/pdf530024 bytesapplication/pdfzh-TW國立臺灣大學環境工程學研究所淨水污泥燒結吸附三層模 式water sludgesinteradsorptionTLMreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/22088/1/902211E002038.pdf