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題 名 | Application of Nano-silica to Paper Mill Sludge Dewatering=奈米膠態矽應用於造紙廠污泥脫水之探討 |
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作 者 | 彭元興; 王益真; 余世宗; 龔信元; 郭蘭生; | 書刊名 | 臺灣林業科學 |
卷 期 | 21:3 民95.09 |
頁 次 | 頁353-362 |
分類號 | 445.46 |
關鍵詞 | 奈米膠態矽; 初沉污泥; 活性污泥; 污泥減量; 含水率; 調理劑; Nano-colloidal silica; Primary sedimentation sludge; Activated sludge; Sludge volume reduction; Moisture content; |
語 文 | 英文(English) |
中文摘要 | 奈米膠態矽的粒徑範圍在2~5 nm。表面改質可依用途使膠態矽表面分別帶陰電荷或陽電荷,或把膠態矽組合成結構狀,最多可達25組顆粒,其顆粒尺度範圍在5~150 nm,表面積範圍為50~800 m2 g-1。在國內已成功的應用在造紙廠的双留存系統,作為留存助劑,以提高纖維的留存率,但尚無應用在污泥脫水的案例。中部某主要產品為文化紙廠及工業紙之紙廠,其廢水處理採沉澱及單段活性污泥單元。實驗用污泥分別選取沉澱初級污泥及活性污泥兩種,探討以陽離子高分子調理劑及以奈米膠態矽,作為双重調理劑,提高污泥脫水效率的可行性。污泥脫水效率以比阻抗 (SRF) 與毛細汲取時間 (CST) 量化。實驗以設計來探討,實驗參數為陽離子高分子聚合物及奈米膠態矽添加順序及添加量。階層分析結果顯示,一次污泥與生物污泥在CST與SRF測試結果的趨勢類似,一次污泥的脫水效率較生物污泥為佳。三個參數皆呈現明顯的主效應,但是不會相互影響。先添加陽離子高分子聚合物,後添加與奈米膠態矽的添加順序有助於改善脫水效率,反之則有害。陽離子高分子聚合物與奈米膠態矽對於脫水效率影響的權數相近,這現象將開啟將來進一步現場實驗的契機。双重調理劑系統的參數最適化及建立反應機構為下一階段主要工作。 |
英文摘要 | Particles of nanoscale colloidal silica have diameters of 2~5 nm, and surface modification can impart these particles with either anionic or cationic charges. A maximum of 25 particles can also be aggregated together to provide structured entities. These aggregates have dimensions of 5~150 nm and surface areas of 50~800 m2 g-1. Nano-silica has successfully been used in a papermaking dual-retention system to help increase the retention of fines and fillers. There is yet no study on their application to sludge dewatering purposes, however. We enlisted the help of a paper mill in central Taiwan which produces cultural and industrial paper products and which applies sedimentation and a single-stage activated sludge (AC) process to treat its mill effluent. The primary sludge from sedimentation and the waste bio-sludge from the AC stage were collected for the experiment. A conventional cationic polymer and a nano-silica preparation were respectively used as a dewatering agent and co-agent to see whether the dewatering efficiency could be enhanced. Sludge dewatering efficiencies were quantified using the specific resistance to filtration (SRF) and capillary suction time (CST). A 23 factorial experimental design was used to delineate the effects and interactions of the sequence of polymer addition and the dosages. Analyses of the factorial design on the CST and SRF tests showed that both the primary sludge and bio-sludge had similar treatment behaviors. All 3 variables under investigation were significant, but none showed interactions with each other. The bio-sludge had a poorer dewatering efficiency than did the primary sludge on the CST and SRF tests. We determined that the cationic polymer should be added first, followed by the anionic nano-silica. The reverse sequence of addition was largely deleterious to the dewatering of the primary sludge. Both the cationic polymer and nano-silica showed close weighting factors on the dewatering efficiency. This presents opportunities for further mill trials. Further optimization of the variables and establishment of a plausible mechanism for the co-conditioner system are the next steps in this work. |
本系統中英文摘要資訊取自各篇刊載內容。