Compressive strength and heavy metal leaching of concrete containing medical waste incineration ash

Akyildiz, Aylin; Köse, Esra Tınmaz; Yıldız, Aylin

doi:10.1016/j.conbuildmat.2017.02.017

Cited by 55 publications

(34 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e highest resistance of 6.1 MPa was reached using 5% yam peel biomass polluted with lead. Similar results were reported by Akyıldız et al [30], who evaluated the mechanical compression of concrete bricks modi ed with medical wastes incineration ashes.…”

Section: Mechanical Resistance Testing For Bricks Of Yam Peelssupporting

confidence: 87%

“…e immobilization of heavy metal ions inside the concrete matrix is explained by the physical encapsulation mechanism and chemical bonds as Al-O o Si-O that are found in the concrete, which allows to obtain less leached concentration [31]. In comparison to other works, the encapsulation process in concrete matrix for immobilizing heavy metals results to be a good alternative to solve disposal problems of polluted biomass after adsorption process [30,32].…”

Section: Leaching Tests For Bricks Of Yam Peelsmentioning

confidence: 99%

See 1 more Smart Citation

Immobilization of Lead and Nickel Ions from Polluted Yam Peels Biomass Using Cement-Based Solidification/Stabilization Technique

Villabona-Ortíz

González-Delgado

Herrera

et al. 2019

International Journal of Chemical Engineering

View full text Add to dashboard Cite

Nowadays, biomass has been employed to prepare biosorbents for heavy metals uptake; however, further disposal of polluted material has limited its application. In this work, nickel and lead removal was performed using yam peels and the resulting polluted biomass was mixed with concrete to produce bricks. The biomass was characterized by FT-IR analysis for testing functional groups diversification before and after adsorption process. The effect of adsorbent dosage, temperature, and initial solution concentration was evaluated to select suitable values of these parameters. Adsorption results were adjusted to kinetic and isotherm models to determine adsorption mechanism. Desorption experiments were also performed to determine the appropriate desorbing agent as well as its concentration. Immobilization technique of cement-based solidification/stabilization was applied and the polluted biomass was incorporated to concrete bricks at 5 and 10%. Mechanical resistance and leaching tests were carried out to analyze the suitability of heavy metals immobilization. The suitable values for dosage, temperature, and initial solution concentration were 0.5 g/L, 40°C and 100 ppm, respectively. The kinetic model that best fitted experimental results was pseudo-second order indicating a dominant physicochemical interaction between the two phases. The highest desorption yields were found in 52.47 and 74.84% for nickel and lead ions. The concrete bricks exhibited compression resistance above 5 MPa and all the leachate reported concentrations below the environmental limit. These results suggested that nickel and lead immobilization using concrete bricks is a good alternative to meet disposal problems of contaminated biomass.

show abstract

Section: Mechanical Resistance Testing For Bricks Of Yam Peelssupporting

confidence: 87%

Section: Leaching Tests For Bricks Of Yam Peelsmentioning

confidence: 99%

Immobilization of Lead and Nickel Ions from Polluted Yam Peels Biomass Using Cement-Based Solidification/Stabilization Technique

Villabona-Ortíz

González-Delgado

Herrera

et al. 2019

International Journal of Chemical Engineering

View full text Add to dashboard Cite

show abstract

“…Extensive efforts have been made to reuse MSWI FA and BA in concrete as replacements for either Portland cement or fine and coarse aggregates [27,130,[140][141][142][143][144][145][146][147][148][149][150]. Because fine and coarse aggregates occupy 70-80% of the total volume in concrete, it can be advantageous to replace some of the aggregates with MSWI ash [125].…”

Section: Pccmentioning

confidence: 99%

Municipal Solid Waste Incineration (MSWI) Ashes as Construction Materials—A Review

Cho

Nam

et al. 2020

Materials

View full text Add to dashboard Cite

Over the past decades, extensive studies on municipal solid waste incineration (MSWI) ashes have been performed to develop more effective recycling and waste management programs. Despite the large amount of research activities and the resulting improvements to MSWI ashes, the recycling programs for MSWI ashes are limited. For instance, although the U.S. generates more MSWI ashes than any other country in the world, its reuse/recycle programs are limited; bottom ash and fly ash are combined and disposed of in landfills. Reuse of MSWI ashes in the construction sectors (i.e., geomaterials, asphalt paving, and concrete products) as replacements for raw materials is one of most promising options because of the large consumption and relatively lenient environmental criteria. The main objective of this study was to comprehensively review MSWI ashes with regard to specific engineering properties and their performance as construction materials. The focus was on (1) the current practices of MSWI ash management (in particular, a comparison between European countries and the U.S.), (2) the engineering properties and performance of ashes when they are used as substitutes of construction materials and for field applications, and (3) the environmental properties and criteria for the use of MSWI ashes. Overall, the asphalt and concrete applications are the most promising, from both the mechanical and leachate viewpoints. However, cons were also observed: high absorption of MSWI ash requires a high asphalt binder content in hot-mix asphalt, and metallic elements in the ash may generate H2 gas in the high-pH environment of the concrete. These side effects can be predicted via material characterization (i.e., chemical and physical), and accordingly, proper treatment and/or modified mix proportioning can be performed prior to use.

show abstract

“…A geopolymer is defined as a synthetic alumino-silicate material and is generated from the reaction of solid alumino-silicate with a highly concentrated aqueous alkali hydroxide or silicate solution [17]. A number of materials have been investigated as candidates for geopolymer production, such as blast furnace slag [30], metakaolin [31], fly ash [32], kaolinitic clays [33], municipal solid waste incineration fly/bottom ashes [34,35] and red mud [36]. However, to our knowledge, there are few correlated studies concerning the geopolymer based on LSS.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Hydration Characteristic of Geopolymer Based on Lead Smelting Slag

Yao

Liu

et al. 2020

IJERPH

View full text Add to dashboard Cite

Lead smelting slag (LSS) has been identified as general industrial solid waste, which is produced from the pyrometallurgical treatment of the Shuikoushan process for primary lead production in China. The LSS-based geopolymer was synthesized after high-energy ball milling. The effect of unconfined compressive strength (UCS) on the synthesis parameters of the geopolymer was optimized. Under the best parameters of the geopolymer (modulus of water glass was 1–1.5, dosage of water glass (W(SiO2+Na2O)) was 5% and water-to-binder ratio was 0.2), the UCS reached 76.09 MPa after curing for 28 days. The toxicity characteristic leaching procedure (TCLP) leaching concentration of Zn from LSS fell from 167.16 to 93.99 mg/L after alkali-activation, which was below the limit allowed. Meanwhile, C-S-H and the geopolymer of the hydration products were identified from the geopolymer. In addition, the behavior of iron was also discussed. Then, the hydration process characteristics of the LSS-based geopolymer were proposed. The obtained results showed that Ca2+ and Fe2+ occupied the site of the network as modifiers in the glass phase and then dissociated from the glass network after the water glass activation. At the same time, C-S-H, the geopolymer and Fe(OH)2 gel were produced, and then the Fe(OH)2 was easily oxidized to Fe(OH)3 under the air curing conditions. Consequently, the conclusion was drawn that LSS was an implementable raw material for geopolymer production.

show abstract

Compressive strength and heavy metal leaching of concrete containing medical waste incineration ash

Cited by 55 publications

References 17 publications

Immobilization of Lead and Nickel Ions from Polluted Yam Peels Biomass Using Cement-Based Solidification/Stabilization Technique

Immobilization of Lead and Nickel Ions from Polluted Yam Peels Biomass Using Cement-Based Solidification/Stabilization Technique

Municipal Solid Waste Incineration (MSWI) Ashes as Construction Materials—A Review

Synthesis and Hydration Characteristic of Geopolymer Based on Lead Smelting Slag

Contact Info

Product

Resources

About