Subscription or Fee Access
Analysis of Means and Variances for Development of Ceramsite from Semi-dried Sewage Sludge and Clay
The use of sewage sludge as additives in the manufacture of ceramic products has been attracting a growing interest from researchers in recent year. In this study, the preparation and characterization of sludge ceramsite manufactured from clay and semi-dried sewage sludge by an innovative composite modifier (ICM) were studied. Taguchi orthogonal experiment, with four variable factors, ratio of ICM to wet sewage sludge (WSS), ratio of clay to WSS, sintering temperature, duration time, and each at three levels, was used to optimize the experiment factors by the analysis of means and variances. Meanwhile, the characterizations (physical properties, microstructure properties and toxic metal leaching properties) of sludge ceramsite prepared under the optimum conditions were tested. The orthogonal experiments results showed that the most significant factor influencing the sludge ceramsite performance was the ratio of clay to WSS, and the mass ratio of clay to WSS to ICM = 1:1:0.05, coupled with sintering at 1180 for 5min, produced the highest quality sludge ceramsite. Property tests of sludge ceremsite showed that sludge ceremsite was light (with an apparent density of 518kg·m-3), waterproof (with a water absorption of 2.3%), hard (with a compressive strength of 9.8Mpa) and nontoxic (contents of toxic metal leaching test were found to be within the limits of China’s regulatory requirement). In addition, the results indicated that as a pretreatment, the addition of ICM, effectively decreased the pore size and improved the properties of the sintered ceramsite.
Semi-dried sewage sludge; Innovative composite modifier; Sintering; Sludge ceramsite; Orthogonal experiment
Disclaimer/Regarding indexing issue:
We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information. Also: DOI is paid service which provided by a third party. We never mentioned that we go for this for our any journal. However, journal have no objection if author go directly for this paid DOI service.