下水污泥焚化灰細度變化與矽氧晶相對燒成骨材輕質化之影響; The Fineness-changing and the silicon-oxide-crystal of the sewage sludge ash affect to the sintering factors of lightweight aggregate

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Title:	下水污泥焚化灰細度變化與矽氧晶相對燒成骨材輕質化之影響;The Fineness-changing and the silicon-oxide-crystal of the sewage sludge ash affect to the sintering factors of lightweight aggregate
Authors:	楊志政;Chig-cheng Yang
Contributors:	環境工程研究所
Keywords:	永續發展;輕質骨材;比表面積;堆置密度;矽氧晶相;助熔劑;sustainable development;lightweight aggregate
Date:	2001-07-18
Issue Date:	2009-09-21 12:14:07 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	永續發展為近年來政府機構與民間企業最熱門的討論議題，而廢棄物的減量與資源化發展方向，更現今廣泛討論的重點，如何化腐朽為神奇將廢棄物轉為可用之資源，將為21世紀之重要課題。台灣地區污水下水道接管率逐年增加，併同產生為數不小的工業污泥或河川底泥的產生，在環保意識的高漲的同時，傳統掩埋處理方式已變得不合時宜；由文獻得知下水污泥具有燒成輕質骨材的潛力，但如何進行透過操作條件的控制，進而有效的將污泥轉換為輕質骨材，則在研究與實際的應用上仍存有很大的未知於其中，本研究的目的在於透過不同控制條件的實驗設計，了解不同污泥灰粒徑分布與矽氧晶相，對下水污泥灰輕質化之影響。本研究利用民生與中區兩不同處理流程污水處理廠污泥餅，經實驗室焚化後以控制不同的燒製溫度（1,050℃∼1,150℃），並探究不同粒徑分佈與矽氧晶相組成對燒成輕質骨材相關工程特性的影響。主要貴重儀器設備的使用包括有：ICP、SEM、XRD、MIP等。於不同粒徑分布實驗結果，對具有相同化學組成的污泥灰而言，壓結試體的堆實密度對燒成骨材輕質化的影響大於污泥灰的比表面積：當污泥灰堆置密度相近，愈大比表面積之試體，其輕質化程度將會愈佳。於矽氧晶相組成實驗結果發現，玻璃相含量有利於骨材的輕質化，並影響骨材體積膨脹、孔隙率增加、密度降低及抗壓強度降低等工程特性；而石英相含量則有相反的影響。由實驗發現，下水污泥燒成輕質骨材不僅受到溫度與矽氧晶相組成影響，助熔劑含量與組成特性亦為重要因子，如何藉由實驗設計並進一步探討助熔劑對燒成骨材輕質化的影響實為後續研究之重點。 Sustainable Development is becoming the main issue for both the government and the civil sections. Among the topics of Sustainable Development, reducing and reusing wastes are the most important subjects in the 21-century. In Taiwan, due to the wider coverage of sewage system in the urban areas, the mount of sewage sludge produced increased largely and the use of traditional sludge treatments to treat sewage sludge is becoming insufficient and inadequate. From literature review, it is widely perceived that sewage sludge ash (SSA) could be used to produce lightweight aggregate, which can be applied as a construction material. However, many parameters of the abovementioned production were still unknown. This study mainly investigated the influence of particle size distribution and the silicon oxide crystal composition of SSA to the lightweight properties of aggregate produced. Using two different-processed SSA and under controlled temperature from 1050℃~1150℃, the effect of particle distribution and silicon oxide crystal to lightweight aggregate was investigated. From the experiment of different SSA particle distribution, we found that the heaped density of SSA sample influenced the bloating property of lightweight aggregate more than the specific surface area of the SSA while the chemical composition of SSA are the same. As the SSA samples have equal heaped density, the lightweight degree of aggregate would be better with higher specific surface area. From the results of silicon oxide crystal composition experiment, the glass phase content in SSA increased the volume and porocity of lightweight aggregate. Besides, it also decrease the density and the pressure resistant strength. However, the quartz content showed contrary effects. Apart from the effects of temperature and silicon oxide crystal composition, we also found that the composition characteristics of flux are also important factors to get lightweight aggregate from sludge sewage. A further study focusing on this factor is suggested.
Appears in Collections:	[Graduate Institute of Environmental Engineering ] Electronic Thesis & Dissertation

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