The wet milling process had been found to effectively stabilize lead in fly ash. This study adopts this method and looks at the effect of different milling solutions to improve the efficiency of lead stabilization. Different milling solutions (water, phosphoric acid and ethanol) and different milling times (1, 24, 48 and 96 h) were selected as parameters. Since lead oxide can be identified by XRD in this experiment's samples, 5% lead oxide was added to the extracted mixed fly ash to make instrumental analysis easier. The experimental results indicate that the effect of stabilization of lead after milling could exceed 96%. During milling with water, considerable lead leached into the water in the initial stage (1 h) of the process, but a stable level was reached as the milling time increased. After milling with ethanol and 0.2 M phosphoric acids, the efficiency could exceed 93% after 1 h of milling time. The results of the sequential extraction procedure (SEP) results show that the residual fraction could be increased from 8.93% to 56.16% when a 0.2 M phosphoric acid solution was used. Clearly the choice of an appropriate milling solution can enhance lead stabilization in the fly ash.
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http://dx.doi.org/10.1016/j.wasman.2010.04.020 | DOI Listing |
RSC Adv
January 2025
National Centre of Excellence in Physical Chemistry, University of Peshawar Peshawar Pakistan.
In this study, a binary composite adsorbent based on activated carbon and phosphoric acid geopolymer foam (ACP) was prepared by combining phosphoric acid geopolymer (PAGP) with activated carbon (AC) and applied for the removal of methylene blue (MB). Activated carbon was thoroughly mixed with a mixture of fly ash and metakaolin in varying ratios, followed by phosphoric acid activation and thermal curing. The ACP adsorbent was characterized using scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectrophotometer, X-ray diffractometer (XRD), surface area analyser (SAP), and thermogravimetric analyser (TGA).
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January 2025
Shanxi Provincial Geological Prospecting Bureau, Taiyuan, 030001, China.
In China, a significant amount of coal fly ash is stored or used for landfill reclamation. The contaminants in coal fly ash (CFA) leachate can cause regional soil and groundwater contamination during long-term storage. This paper focuses on a coal gangue comprehensive utilisation power plant in Fenyang City, Shanxi Province, China, where the leaching characteristics of CFA were investigated by leaching tests.
View Article and Find Full Text PDFAdv Sci (Weinh)
January 2025
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310058, China.
L-Aspartic acid (L-Asp) poses a dual function, which can affect the evaporation and crystallization process of the high-salinity brine by altering the physical or chemical properties of the salts. MSWI (municipal solid waste incineration) fly ash washing leachate, as a typical high-salinity brine, is utilized here to validate this hypothesis under the simulation guidance. Since L-Asp has stronger adsorption energy on the (110) crystal face of CaCO, L-Asp can facilitate the preferential growth of more valuable vaterite during the softening process (pretreatment before crystallization).
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January 2025
Department of Environmental Sciences, Government College University Faisalabad, Faisalabad, 38000, Pakistan.
Household kitchen waste (HKW) is produced in large quantity and its management is difficult due to high moisture content and complex organic matter. Aerobic composting of HKW is an easy, efficient, cost-effective and eco-friendly method. This study is designed to achieve a zero-waste concept and to convert HKW.
View Article and Find Full Text PDFEnviron Res
January 2025
College of Ecology and Environment, Xinjiang University, Urumqi 830046, China.
The objective of this investigation is to overcome the difficulties in fabricating cost-effective, eco-friendly porous geopolymers (PGs) by integrating Coal fly ash (CFA) and spodumene flotation tailings (SFT). This synthesis utilizes a unique blend of CFA and SFT in a 6:4 mass ratio, with specific attention to optimizing the pore architecture to improve the PGs' efficacy. Key parameters included a modulus of 1.
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