Effects of sintering temperature on the characteristics of lightweight aggregate made from sewage sludge and river sediment

Liu, Mingwei; Wang, Chunze; Bai, Yang; Xu, Guoren

doi:10.1016/j.jallcom.2018.03.216

Cited by 99 publications

(35 citation statements)

References 27 publications

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“…Also, as shown in Figure 10(b), the range of the compressive strength is ∼1.71-51 MPa, whereas that of the linear shrinkage is ∼3-22%. ese results are consistent with other studies carried out elsewhere [36][37][38]. It is worthy of note that the increase of the sintering temperature in the second- Figure 10(a), at the sintering temperature range of 1000°C-1150°C, there was a continuous decrease of the apparent porosity.…”

Section: Influence Of Two-stage Sintering Process On the Characteristsupporting

confidence: 92%

Influence of a Two-Stage Sintering Process on Characteristics of Porous Ceramics Produced with Sewage Sludge and Coal Ash as Low-Cost Raw Materials

Al-qadhi

2019

Advances in Materials Science and Engineering

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In this paper, the two-stage sintering process as a promising strategy has been adopted to prepare high-performance porous ceramics with high porosity. Sewage sludge and waste coal ash were used as raw materials and added were starch and CaCO3 as a mixed foaming agent. The chemical composition of the raw materials and mixed foaming agents were analyzed by standard techniques. All mixtures were prepared from fixed solid materials mixed at a ratio of 48 : 32 : 10 : 10 (wt.%) for coal ash, sludge, starch, and CaCO3, respectively, followed by granular molding, aging, sintering and property survey tests. The influence of heating rate, holding time, and heating temperature of the two stages on the characteristics of the as-obtained porous ceramics was deeply investigated. The properties investigated are apparent porosity, bulk density, compressive strength, and linear shrinkage. On the one hand, the results show that the major content of the raw materials is silica (SiO2). On the other hand, the results show that the first-stage sintering process had minimal influence on the properties, whereas the second-stage sintering process had a significant influence on the properties of the porous ceramics. With the optimized sintering parameters (temperature, heating rate, and holding time) of the first stage and second stage, we obtained a high-performance porous ceramic product with an apparent porosity up to 51.3%, bulk density up to 1.22 g/cm3, linear shrinkage up to 14.3%, and compressive strength up to 25.1 MPa. Also, the results of the phase composition and microstructure revolution showed sufficient glassy phases and feldspar (Ca, Na) (Si, Al)4O8, which are known to enhance bending strength of ceramics. A comparison of these properties and characteristics with those of standard porous ceramics revealed that the product developed in this study would compete favorably for real applications.

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Section: Influence Of Two-stage Sintering Process On the Characteristsupporting

confidence: 92%

Influence of a Two-Stage Sintering Process on Characteristics of Porous Ceramics Produced with Sewage Sludge and Coal Ash as Low-Cost Raw Materials

Al-qadhi

2019

Advances in Materials Science and Engineering

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“…In recent years, agricultural reuse faces strong public opposition by local stakeholders (Liu et al, 2018b;Mininni et al, 2015). Therefore, in last few years, BS reuse in agriculture has declined or even stopped in some European countries such as Finland, Slovenia, Sweden, the Netherlands, Greece and Belgium and stricter regulations have been introduced (Praspaliauskas and Pedi sius, 2017; Tyagi and Lo, 2011).…”

Section: Social Acceptancementioning

confidence: 99%

Biosolids: What are the different types of reuse?

Collivignarelli

Canato

Abbà

et al. 2019

Journal of Cleaner Production

145

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“…Therefore, the issues related to sewage sludge management are increasing. The introduction of waste hierarchy, with Directive 2018/851/EC [9], and the opposition of citizens (who perceived sewage sludge as dangerous for human health and for the environment) [10] forced the technicians to re-think completely the sewage sludge management strategy: landfilling was banned, land application was limited, and other routes of recovery are underdeveloped [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Legislation for the Reuse of Biosolids on Agricultural Land in Europe: Overview

et al. 2019

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The issues concerning the management of sewage sludge produced in wastewater treatment plants are becoming more important in Europe due to: (i) the modification of sludge quality (biological and chemical sludge are often mixed with negative impacts on sludge management, especially for land application); (ii) the evolution of legislation (landfill disposal is banned in many European countries); and (iii) the technologies for energy and material recovery from sludge not being fully applied in all European Member States. Furthermore, Directive 2018/851/EC introduced the waste hierarchy that involved a new strategy with the prevention in waste production and the minimization of landfill disposal. In this context, biological sewage sludge can be treated in order to produce more stabilized residues: the biosolids. In some European countries, the reuse of biosolids as soil improver/fertilizer in arable crops represents the most used option. In order to control the quality of biosolids used for land application, every Member State has issued a national regulation based on the European directive. The aim of this work is to compare the different approaches provided by European Member States for the reuse of biosolids in agricultural soils. A focus on the regulation of countries that reuse significant amount of biosolids for land application was performed. Finally, a detailed study on Italian legislation both at national and regional levels is reported.

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Effects of sintering temperature on the characteristics of lightweight aggregate made from sewage sludge and river sediment

Cited by 99 publications

References 27 publications

Influence of a Two-Stage Sintering Process on Characteristics of Porous Ceramics Produced with Sewage Sludge and Coal Ash as Low-Cost Raw Materials

Influence of a Two-Stage Sintering Process on Characteristics of Porous Ceramics Produced with Sewage Sludge and Coal Ash as Low-Cost Raw Materials

Biosolids: What are the different types of reuse?

Legislation for the Reuse of Biosolids on Agricultural Land in Europe: Overview

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