Sewage Sludge Ash Characteristics

Dhir, Ravindra K.; Ghataora, Gurmel S.; Lynn, Ciarán J.

doi:10.1016/b978-0-08-100987-1.00004-4

Cited by 9 publications

(3 citation statements)

References 157 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ISSA normally only possesses a relatively low pozzolanic reactivity due to the presence of a large amount of crystallised SiO 2 and the particles are with irregular shapes and large porosity [13,14]. Even so, as a valuable resource, the ISSA has a great potential to be applied for the production of cement, aggregates, mortars, concrete and controlled low-strength materials [15]. In addition, many researchers have studied the use of ISSA as supplementary cementitious materials [11,[16][17][18] and for soil stabilisation [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders

Zhou

Lü

et al. 2020

Construction and Building Materials

View full text Add to dashboard Cite

The disposal of sewage sludge ash (SSA) has become an environmental issue due to the limited available landfilling space. This study aims at applying the finely-ground sewage sludge ash (FSSA) with quicklime and hydrated lime respectively to develop a new type of lime-pozzolan system and study the effects of different types of lime on the mechanical properties of the systems. A traditional pozzolanic material (i.e. coal fly ash (FA)) was also used to compare with the FSSA. Multiple techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used to assess the hydration kinetics and microscopic characteristics of the lime-pozzolan systems. The results showed that the quicklime system exhibited lower strength than the hydrated lime system, which was due to its lower reaction degree with the FSSA and the higher porosity caused by the expansion during the vigorous hydration reaction of quicklime. Compared to FA, the FSSA attained higher strength for the whole curing period (up to 90 d) in the lime system due to the highly porous nature of FSSA leading to a lower effective water to binder ratio. However, in the hydrated lime system, due to the higher overall pozzolanic activity of FA, its long-term strength values gradually improved. Besides, calcium phosphate hydrate crystals were detected by XRD in the FSSA; while some clinotobermorite was found in the FA both from XRD and SEM, which might govern the strength gain in the lime-FA system. Overall, the application of FSSA as a pozzolan in the lime-pozzolan system could be a promising option to both relieve the waste disposal pressure and provide a potential sustainable construction material.

show abstract

Section: Introductionmentioning

confidence: 99%

Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders

Zhou

Lü

et al. 2020

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…The constituents of fly ash and slag particles being composed in mineral components, such as silica, alumina, and iron oxides, as these minerals have a natural tendency to form crystalline structures [36][37][38]. In the nickel industry domain, sludge and bottom ash usually consist of a diverse mixture of constituents, which include residual solids, liquids, and disordered substances [39,40]. Therefore, the presence of liquids and non-crystalline substances can hold back the development of crystal formation.…”

Section: Crystallinity Analysismentioning

confidence: 99%

Uncovering the potential of industrial waste: turning discarded resources into sustainable advanced materials

Rauf,

Heryanto,

Tahir

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

To identify solutions for utilizing industrial wastes (slag, sludge, fly ash, and bottom ash) in the development of pro-environmental systems, this paper reviews existing literature and explores material characterization methods. A review analysis was conducted to uncover their potential, and it was found that many utilizations can be made to recycle them into sustainable materials. Structure characterization, optical-dielectric function, and morphology analysis were analyzed to confirm the recent review. Structural properties are represented by crystallite size and crystallinity, where nickel slag shows the smallest distribution (55±10) nm with the highest crystallinity (25.42%), indicating its association with uniformity of response to external disturbances and micro-structural stability. From the analysis of optical and dielectric functions via Kramers Kronig relation, the widening of ∆(LO-TO) was shown by fly ash and slag indicating stable bonding suitable as x-ray shielding and sensor, while high electron loss functions were shown by sludge and bottom ash indicating high potential electronic transition performance. Based on their chemical and physical properties, these industrial wastes are not limited as construction materials and can even be upgraded to more advanced development materials.

show abstract

“…X-ray fluorescence spectrometer analysis of SSA consistently reveals that the main contained elements (with oxygen) are silicon, iron, aluminum, calcium, and phosphorus. However, significant contents of heavy metals have also been observed, which are concentrated in the SSA when sludge is incinerated (Dhir et al, 2017;Donatello & Cheeseman, 2013;Chang et al, 2020;Cyr et al, 2007;Lynn et al, 2018). According to some studies, trace heavy metals are found in SSA due to their condensation on the ash particles after the temperature decrease inside the incineration plant.…”

Section: Composition Of Sewage Sludge and Ssa Regarding The Environmental Impact Of Potentially Toxic And Hazardous Elements And Compoundmentioning

confidence: 99%

Lca of Heavy Metals Leaching From Landfilled Sewage Sludge Ash

Nakić

Vouk

Šiljeg

et al. 2021

Journal of Environmental Engineering and Landscape Management

View full text Add to dashboard Cite

Quantities of sewage sludge that are thermally treated (mostly incinerated) are increasing, resulting in growing quantities of sewage sludge ash (SSA) which also requires further management. Despite its potential as a resource, it is still largely landfilled. Considering the presence of potentially toxic and hazardous heavy metals in SSA, this paper analyzes how the change in the leaching concentrations of the selected heavy metals from landfilled SSA impacts the environment (air, water, and soil) by the means of LCA. When considering human toxicity potential as impact category, dominant impacts were due to emissions into the air, primarily caused by leaching of selenium and somewhat less cadmium, mercury and nickel. Mercury had a dominant impact when considering the terrestrial ecotoxicity potential impact. In the SSAs obtained from Croatian sludge, molybdenum leaching, along with selenium and mercury, showed a dominant impact. Therefore, due to the high variability of trace elements, detailed analysis of different SSAs is needed.

show abstract

Sewage Sludge Ash Characteristics

Cited by 9 publications

References 157 publications

Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders

Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders

Uncovering the potential of industrial waste: turning discarded resources into sustainable advanced materials

Lca of Heavy Metals Leaching From Landfilled Sewage Sludge Ash

Contact Info

Product

Resources

About