Sustainable stabilization/solidification of municipal solid waste incinerator fly ash by incorporation of green materials

Chen, Liang; Wang, Lei; Cho, Dong-Wan; Tsang, Daniel C.W.; Tong, Lizhi; Zhou, Yaoyu; Yang, Jian; Hu, Qing; Poon, Chi Sun

doi:10.1016/j.jclepro.2019.03.057

Cited by 216 publications

(51 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Given the formation of aluminum gel, when CaO and gypsum were added, they will react with the aluminum gel and form additional ettringite as shown in Equation (6). In order to reduce the use of nature resources [27,28,29,30,31,32,33,34] and increase the use of recycled materials [35,36,37], fluorgypsum was used in this study. Besides, adding slaked lime and aluminum sulfate can promote the formation of ettringite and C-S-H in masonry mortar [38].…”

Section: Introductionmentioning

confidence: 99%

Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Wang

Wang³

et al. 2019

Materials

View full text Add to dashboard Cite

Grouting materials are used frequently in grouting reinforcement projects, such as mining and coastal engineering. Double liquid grouting materials are mostly used because of the fast setting and high early strength properties when the two slurries are mixed together but high fluidity when the two slurries are separated. In our study, double liquid grouting materials were developed from CSA cement (slurry A), quicklime and fluorgypsum (slurry B). Aluminum sulfate was added in slurry B in order to counteract any adverse effects caused by the fluorgypsum, such as the decreased early compressive strength and the prolonged setting time. The effects of aluminum sulfate content and the quicklime/fluorgypsum ratio on the setting time, hydration heat, and compressive strength of the double liquid grouting materials were investigated, and the hydration products were characterized through thermogravimetry-differential thermal analysis (TG-DTA), X-ray Diffraction (XRD), and Scanning Electron Microscope (SEM) tests. The results show that the addition of aluminum sulfate can shorten the setting time and increase compressive strength at both early and later ages. Considering the setting time and compressive strength of double liquid grouting material at the same time, the optimum content of aluminum sulfate was found to be 2%, and the optimum ratio of quicklime/fluorgypsum was found to be 2:8. The values of the optimum content of aluminum sulfate and ratio of quicklime/fluorgypsum were verified from theoretical analysis.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Wang

Wang³

et al. 2019

Materials

View full text Add to dashboard Cite

show abstract

“…Stabilization/solidification process has been presenting itself as an efficient and reliable technology for the treatment of hazardous materials (CHEN et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Immobilization of chromium in cement matrices after treatment by stabilization/solidification of solid chemical residues

Silva¹,

Brito²,

Jovelino³

2021

RHE

View full text Add to dashboard Cite

Os resíduos gerados nas Universidades representam 1% do total de resíduos em relação às demais fontes geradoras de resíduos sólidos, porém, apresentam dificuldade de tratamento devido à quantidade e diversidade de compostos ignific em um único resíduo. Os resíduos são classificados de acordo com as características de inflamabilidade, corrosividade, reatividade, toxicidade e patogenicidade (Classe I) ou biodegradabilidade, combustibilidade ou solubilidade em água (classe II A ou classe II B). Quando classificados como perigosos, causam danos à saúde e ao meio ambiente. Um tratamento alternativo é a estabilização/solidificação, que promove a incorporação dos resíduos nas matrizes cimentícias. O objetivo deste trabalho é ignific a imobilização do cromo presente em resíduos sólidos de laboratórios químicos em matrizes cimentícias, visando reduzir o impacto ignifica causado pela destinação inadequada desse tipo de resíduo. Os corpos-de-prova foram confeccionados com cimento Portland pozolônico, areia fina, brita e resíduo sólido de laboratório químico. Após testes de integridade/durabilidade e imobilização de contaminantes, os melhores resultados foram encontrados para a incorporação de 5% de resíduos sólidos de laboratório. Apesar da matriz de 35% ter falhado no teste de lixiviação, todos os tratamentos apresentaram eficiência de retenção de cromo acima de 93%, indicando que houve redução ignificative na concentração do metal no resíduo após o tratamento.

show abstract

“…The dredging activities are normally performed to meet navigational needs or remove the contaminated deposits. With the rapid growth of Chinese industries, the annual production of sediment in China is up to 300 million tons and the number will continue to increase as reported [1,2]. The sediment, normally composed of fine particles, can adsorb potential contaminants such as nutrient elements and heavy metals, when present in excessive amounts.…”

Section: Introductionmentioning

confidence: 99%

“…The objectives of this study were twofold: (1) to investigate the effect of organics (fulvic acid) on the migration of heavy metal ions (Cu 2+ , Zn 2+ ) in the sediment treated by the electro-osmosis method, (2) to evaluate the effect of organics on the mechanical properties of the sediment treated by the S/S method. In the electro-osmosis tests, the Voltage and pH values were varied to assess the changes in heavy metal concentration and mechanical properties of sediment with various organics contents.…”

Section: Introductionmentioning

confidence: 99%

Effect of Organics on Heavy Metal-Contaminated River Sediment Treated with Electro-Osmosis and Solidification/Stabilization Methods

Pan

Chen

2020

Materials

View full text Add to dashboard Cite

This study focuses on the treatment of heavy metal ions and achieving enhancement of river sediment, which is rich in organics. Fulvic acid was used as the main representative of organics in which to study the transfer of Cu2+, Zn2+ ions in the electroosmotic system, in both the absence and presence of organics. In addition, the effects of the experiment parameters (i.e., voltages, displacement, and water content), heavy metal ion content (0.19% and 0.38%, respectively), and the concentration of organics (1.5%, 3%, and 4.5%) acting on migration of ions and physiochemical properties of sediment, before and after electro-osmosis treatment were investigated. Mineral composition of the soil and its microscopic characteristics were analyzed by scanning electron microscopy. The results show that the 4.5% fulvic acid added in the sediment can enhance the migration ability of Cu2+ and Zn2+ ions through complexation, and simultaneously effectively reduce the formation of colloids with the average reductions of Cu2+ ions and Zn2+ ions being 28 and 11 mg/kg, respectively. While the dewatering capacity of the sediment with higher fulvic acid content is weaker, fulvic acid can effectively reduce the corrosion of the electrode during the electro-osmosis process, due to the film formed on the metal surface. Moreover, the fulvic acid in the organics can be combined with the aluminum and calcium produced by the hydration of the cement, delaying the hydration of the cement, while simultaneously decomposing the hydration product and hindering the hardening of the cement, thereby affecting and destroying the formation of the sediment’s structure and its strength.

show abstract

Sustainable stabilization/solidification of municipal solid waste incinerator fly ash by incorporation of green materials

Cited by 216 publications

References 38 publications

Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Effects of Aluminum Sulfate and Quicklime/Fluorgypsum Ratio on the Properties of Calcium Sulfoaluminate (CSA) Cement-Based Double Liquid Grouting Materials

Immobilization of chromium in cement matrices after treatment by stabilization/solidification of solid chemical residues

Effect of Organics on Heavy Metal-Contaminated River Sediment Treated with Electro-Osmosis and Solidification/Stabilization Methods

Contact Info

Product

Resources

About