Utilizing wastewater treatment sludge in mortar to minimize the carbon footprints

Name: Oo, Hein Htet

Organization : Mahidol University. Faculty of Engineering

Name: Totsawat Daungwilailuk

Organization : Mahidol University. Faculty of Engineering

Email : totsawat.dau@mahidol.ac.th

Name: Tanthong Thongkong

Organization : Mahidol University. Faculty of Engineering

Name: Satchapat Thongsom

Organization : Mahidol University. Faculty of Engineering

Name: Sujitra Thonthan

Organization : Mahidol University. Faculty of Engineering

LCSH: Sustainable construction

LCSH: Sewage sludge as fertilizer

LCSH: Mortar -- Testing

LCSH: Cement -- Environmental aspects

Abstract: Cement production from the construction industry significantly contributes to global carbon emissions. Simultaneously, unsustainable sludge disposal methods from water treatment facilities have become an alarming threat to the environment nowadays. To tackle both issues, this research aims to investigate the potential of utilizing untreated wastewater treatment sludge (WWTS) as a partial cement replacement in mortars. Unlike previous studies that used energy-intensive treatment processes, this research emphasizes adopting untreated WWTS collected from the water quality control plant in Bangkok, Thailand, to enhance sustainability gains. In this study, five mortar mixes with WWTS replacement percentages of 0%, 5%, 10%, 15%, and 20% by weight of cement were prepared and tested. Physical properties of mortars were assessed by means of flowability and setting time. Mechanical performance of mortars was examined through compressive strength testing at 3, 7, and 28 days. Furthermore, a comparative analysis of carbon emissions between control mortar and WWTS-incorporated mortars was carried out in evaluating the environmental benefits of this study. By utilizing untreated WTS and analyzing its effects on mortar properties, the various replacement levels of cement with WWTS that balance mortar’s performance and environmental benefits were determined. The findings of this study will contribute to sustainable construction practices by offering twofold benefits, not only in the reduction of cement consumption but also in providing an environmentally friendly solution for WWTS disposal.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2025

Modified: 2025-11-03

Issued: 2025-11-03

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BibliograpyCitation : ใน วิศวกรรมสถานแห่งประเทศไทย ในพระบรมราชูปถัมภ์ และมหาวิทยาลัยเกษตรศาสตร์ กำแพงแสน. คณะวิศวกรรมศาสตร์. การประชุมวิชาการวิศวกรรมโยธาแห่งชาติ ครั้งที่ 30 (NCCE 30) (MAT-33-1-9). นครปฐม : มหาวิทยาลัยเกษตรศาสตร์ กำแพงแสน, 2568

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