STABILIZATION OF MERCURY CONTAINING SLUDGE BY A COMBINED PROCESS OF 2-STAGE PRETREATMENT AND SOLIDIFICATION

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/26718

Title:	STABILIZATION OF MERCURY CONTAINING SLUDGE BY A COMBINED PROCESS OF 2-STAGE PRETREATMENT AND SOLIDIFICATION
Authors:	CHANG,CY;HSU,CP;JANN,JS;CHEN,YW;SHIH,YC;MAO,CF;LIN,WY;YIN,KL;WU,YM
Contributors:	化學工程與材料工程學系
Keywords:	HAZARDOUS-WASTE;SITE DEMONSTRATION;TECHNOLOGIES;MECHANISMS;METALS
Date:	1993
Issue Date:	2010-06-29 17:35:05 (UTC+8)
Publisher:	中央大學
Abstract:	The stabilization of a mercury-bearing sludge, which is a typical hazardous waste of the chlor-alkali industry in the southern of Taiwan, has been performed by using a cement-fly ash solidification method. A two-stage pretreatment procedure consisting of using sodium sulfide and ferrous sulfate is employed to stabilize the solid end-product. Both the concentrations of the organic mercury in the extraction leachate (C(o)) of the solids matrix, which had not been previously paid much attention to, and of the total mercury (C(t)) have been examined. The results indicate that the two-stage pretreatment greatly enhances the stabilization efficiency of the solid matrix. The value of C(t) can be reduced to a value lower than 1 ppb, which is well below 5 ppb (a Japanese safety regulation on Hg for the in-land sanitary landfill). No organic mercury in the extraction leachate has been detected for the combined process of the two- stage pretreatment and the solidification. Furthermore, within the ranges of experimental conditions of this work, the tendency of C(t) to increase with curing time in the solidification by the process without two-stage pretreatment is greatly prevented by the two-stage pretreatment process. In addition, the 28-day compressive strength of the solid end-product can reach a value larger than 33 kg/cm2, which is well above 10 kg/cm2 (another Japanese regulation).
Relation:	JOURNAL OF HAZARDOUS MATERIALS
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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