Recycling of sludge from drinking water treatment as ceramic material for the manufacture of tiles

JOURNAL OF CLEANER PRODUCTION

卷:201

Article

Cremades, L., V¹  Cusido, J. A.²  Arteaga, F.³ 

[1] Univ Politecn Cataluna, Dept Project & Construct Engn, Avda Diagonal 647, Barcelona 08028, Spain

[2] Univ Politecn Cataluna, Dept Phys, Pere Serra 1-15, Barcelona 08193, Spain

[3] Univ Piura, Inst Hidraul Hidrol & Ingn Sanit, Av Ramon Mugica 131, Piura 131, Peru

关键词: Recycling spray-dried sludge;    Drinking water treatment plant;    Ceramic material;    Tiles;    Leaching;    Degassing tests;   

DOI  :  10.1016/j.jclepro.2018.08.094

来源: Elsevier

【 摘 要 】

Currently, the main destination for sludge from Drinking Water Treatment Plants (DWTP) is its disposal in sanitary landfills. However, its chemical composition and physical properties make it suitable for use as a building material. In this work, the use of spray-dried DWTP sludge on the manufacture of cladding ceramic material for the production of tiles as an alternative to the final disposal of sludge is analysed. The work is based on an experimental study carried out on a laboratory scale. Clay and spray-dried DWTP sludge (average humidity of 3 wt%) were mixed with different percentages of sludge (from 0 to 70 wt%) to form a slurry to be extruded. Specimens were then fired up to 980 degrees C. Chemical and mineralogical composition of raw materials was analysed. Technical properties of the ceramic samples were determined. The results obtained showed that the DWTP sludge became a powder with low organic content and a high-micronised calcareous content (14.4 wt% calcium oxide). The ceramic samples had a high open porosity, which increases with the increase in sludge addition percentage. They also had a high dilatometric coefficient. Taking into account these two properties, a possible application of this material would be the manufacture of glazed tiles. The resulting ceramic material does not pose any environmental problem, far surpassing the NEN-7345 leaching test and accelerated degassing tests (outgassing PSS-01-702 and offgassing PSS-01-729 standards of the European Space Agency). (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free