Abstract: This research was conducted to study of the leachability of heavy metals in the interlocking blocks made from wastewater sludge binding with fly ash and cement. Dried sludge from wastewater treatment plant of Bangkok Metropolitan Administration mixed with fly ash, cement and tap water was used to different ratios of mixtures (weight by weight) as 4:1:1, 4:3:1 and 4:4:1 (cement, fly ash and wastewater sludge ratios). After that, this mixture was used to make interlocking blocks. All the interlocking blocks were cured for 7 days and tested for compressive strength by the method of TIS 109-2517 and leachability of heavy metals by the method of Waste Extraction Test (WET). The results of the compressive strength for the ratios of 4:1:1, 4:3:1 and 4:4:1 were 6.77, 10.82 and 11.77 MPa,respectively. The leachabilities of Cadmium in those ratios were 2.282, 0.993 and 0.267 µg/L, respectively. For the Chromium, they were 203.496, 103.064 and 98.421 µg/L, respectively. Whereas, those for Lead were 1.251, 0.616 and 0.282 µg/L, respectively. Finally, the leachabilities of Arsenic were 84.433, 53.182 and 26.277 µg/L, respectively. The compressive strength for all three ratios of the interlocking blocks was met the Thai Community Product Standard (≥ 2.5 MPa). The leaching concentration of heavy metals was also not over the Standard of Thai Ministry of Industry. Results suggest that the three ratios can be used to produce interlocking block.
Keywords: wastewater sludge, fly ash, interlocking block, heavy metals, leachability.
Title: Leachability of Heavy Metals of Interlocking Block made from Wastewater Sludge, Fly Ash and Cement
Author: Arjinee Kongyam, Suthep Silapanuntakul, Tanasri Sihabut
International Journal of Interdisciplinary Research and Innovations
ISSN 2348-1218 (print), ISSN 2348-1226 (online)
Vol. 11, Issue 1, January 2023 - March 2023
Page No: 34-37
Research Publish Journals
Website: www.researchpublish.com
Published Date: 11-February-2023
