https://scholars.lib.ntu.edu.tw/handle/123456789/76772
Title: | 污泥調理脫水效率提昇之整合型研究─子計畫三:增溫對污泥脫水特性之影響探討(I) Heat/ Polymer Treatment on Sludge Dewatering Characteristics |
Authors: | 林正芳 | Keywords: | 污泥脫水;增溫調理;黏滯度;毛係汲取時間;比組抗 | Issue Date: | 31-Jul-1999 | Publisher: | 臺北市:國立臺灣大學環境工程學研究所 | Abstract: | 調理劑的種類、劑量與調理方式對 污泥脫水特性有很大的影響。陽性調理 劑對於三種污泥均有較好的調理效果, 而非離子性與陰性調理劑對無機污泥的 脫水性略有改善,但對有機污泥的脫水 性則完全無益處。同時CST 與SRF 可 為調理劑調理指標,但黏滯度(viscosity) 卻無法為調理劑的指標參數。 增溫調理與雙重調理均能改善污泥 脫水效率。增溫時間對污泥脫水特性沒 有明顯的影響,主要影響為溫度因子, 能提高污泥的脫水特性。陽性調理劑與 增溫之雙重調理能大幅的改善污泥的脫 水性,而非離子性與陰性調理劑之雙重 調理雖能改善污泥的脫水性,但主要因 子為增溫調理。除此之外,CST 與SRF 無法作為生物污泥增溫調理與三種污泥 雙重調理的指標參數,而增溫與添加調 理劑均會改變污泥的黏滯度,低黏滯度 有較佳之脫水性,所以黏滯度可作為增 溫調理及雙重調理之指標參數。 Sludges are concentrated residues generated from wastewater treatment process. Sludges in origin are organic matters, biomass, and/or natural inorganic particles. Without further treatment and safe disposal, sludges will pose adverse effects on environmental quality. Therefore, sludge treatments including volume/mass/water reduction, organic stabilization, and disinfection are fairly important parts of the total waste abatement streams. In this study, the dewatering of model biosludges from food processing plant and coagulant sludges from two water treatment plants with meso-temperature conditioning was investigated. In addition to raise sludge temperature to the range of 50 to 80 ℃, three different conditioning polymers, cationic, anionic and neutral, were used in conjunction with the sludge-heating operations. Parameters adapted for evaluating the dewatering of sludges are capillary suction time (CST), specific resistance of filtration (SRF), sludge slurry viscosity, and solids content of the centrifugally dewatered sludges. Among the three polymers, the cationic polymer exhibits the best improvement on sludge dewatering characteristics in terms of CST and SRF. There is a very close relationship between CST and SRF for the three kinds of sludges. As the sludge slurry is a non- Newtonian fluid, the sludge viscositypresents a non-constant value. It is not justified to correlate sludge viscosity to CST or SRF. Therefore, sludge viscosity is not a suitable parameter for evaluating polymer efficiency. The dewatering of sludge can be significantly improved by the combined effect of increasing sludge temperature and using cationic polymer as conditioner. The heating period is not a critical factor on sludge dewatering process. The viscosity of sludge slurry was modified on applying conditioning polymer as well as raising sludge temperature. Decreasing sludge viscosity will enhance sludge solid/water separation efficiency on centrifugation. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/22034 | Other Identifiers: | 882218E002033 | Rights: | 國立臺灣大學環境工程學研究所 |
Appears in Collections: | 環境工程學研究所 |
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882218E002033.pdf | 31.75 kB | Adobe PDF | View/Open |
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