Studies on potential of Portland cement mortar for binding of waterworks sludge to reduce heavy metal leaching
| Autor: | Paramalinggam Thanalechumi, Mohanadoss Ponraj, Abdull Rahim Mohd Yusoff, Hanim Awab |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
021110 strategic defence & security studies Materials science Metallurgy 0211 other engineering and technologies General Engineering 02 engineering and technology 010501 environmental sciences 01 natural sciences law.invention Portland cement Compressive strength chemistry law Organic matter Leaching (metallurgy) Fourier transform infrared spectroscopy Mortar Chemical composition Curing (chemistry) 0105 earth and related environmental sciences |
| Zdroj: | Sādhanā. 41:359-367 |
| ISSN: | 0973-7677 0256-2499 |
| DOI: | 10.1007/s12046-016-0472-0 |
| Popis: | The investigation of heavy metal leaching and physicochemical properties of cement-solidified waterworks sludge (CMWWS) formed by incorporating waterworks sludge (WWS) into cement mortar was carried out. The chemical composition, compressive strength and other physicochemical properties of the CMWWS cube specimens were determined using field emission scanning electron microscopy (FESEM), X-ray diffractometry (XRD) and Fourier transform-infrared spectroscopy (FTIR). The major type of chemical components present in CMWWS was found to be Al and Fe. The increasing amount of WWS added to cement mortar resulted in the increasing of organic matter, urchin-like morphology and clear peak intensity. At the end of 28 days of curing, the soaking solution became strongly basic and CMWWS cube specimens leached out higher amount of heavy metals. The compressive strength of CMWWS increased up to a WWS percentage of 10%, and basic (pH > 7) curing solution was found to be better than water for curing purposes. It is concluded that solidification–stabilisation (S/S) technique is able to effectively reduce the leaching of heavy metals from the WWS and CMWWS containing up to 10% WWS can be used as construction material. |
| Databáze: | OpenAIRE |
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