Leachability of Heavy Metals from Lightweight Aggregates Made with Sewage Sludge and Municipal Solid Waste Incineration Fly Ash

Wei, Na

doi:10.3390/ijerph120504992

Cited by 35 publications

(12 citation statements)

References 34 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, the development of LWAs has focused on industrial waste or municipal solid waste as a raw material for reducing the use of natural resources [3][4][5][6][7][8][9][10][11][12]. In other words, industrial waste or municipal solid waste can be reused as a sustainable resource in the manufacturing process of artificial LWAs.…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties of Self-Consolidating Lightweight Aggregate Concrete and Its Application in Prestressed Concrete Members

Chen

Tang

et al. 2018

Sustainability

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Self-consolidating lightweight aggregate concrete (SCLC) is a highly flowable and lightweight concrete. In this study, the properties of SCLC and prestressed SCLC members were tested and compared with those made of normal-weight self-consolidating concrete (SCC). The test results show that SCLC can be used for prestressed concrete members. The use of lightweight aggregates with a particle density larger than 1100 kg/m 3 can avoid the serious segregation of fresh concrete. In addition, the SCLC designed in this study can meet most of the SCC Rank 2 test standards, except for the V-funnel test. The water contained in the lightweight aggregates supplied sustained curing, so the level of drying shrinkage of the SCLC was lower than that of the conventional SCC. However, the level of creep of the SCLC was higher than that of the conventional SCC, because normal-weight aggregates are more able to inhibit the change of the concrete's volume. On-site test results show that after 180 days of prestressing, the prestress loss was about 5.35-6.83% for the full-size SCLC members, which was smaller than that for the conventional SCC members (about 8.19-9.06% loss).

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“…Daha sonra, YHA üretim sürecinin gelişimi için araştırmacılar, endüstriyel atıkları hammadde olarak doğal kaynakların yerine ikame ederek kullanmayı amaçlamışlardır [21,25]. Günümüzde, YHA'lar yapısal ve yapısal olmayan betonlar ile prekast üretiminde kaba agrega olarak tercih edilebilmektedir [25,26]…”

Section: üLkemizdeunclassified

“…Pek çok bilim adamı dünyada sınırlı miktarlarda bulunan doğal kaynakların kullanımını azaltmak için deniz/nehir sedimanlarının tek başına [19,20] ve/veya atık cam [21], arıtma çamuru [22,23], cam tozu [24] ve/veya atık yakma tesisi UK [25,26] ilavesi ile YHA üretiminde sürdürülebilir kullanımları konusuna odaklanmıştır. Ama yine de, DTM'lerin kömür UK ve ADK ile birlikte faydalı kullanımı yoluyla YHA üretimine ilişkin bilinen bir çalışma bulunmamaktadır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Deniz Dibi Tarama Malzemesi, Kömür Uçucu Külü ve Atık Döküm Kumunun Hafif Agrega Olarak Geri Kazanımı

Erdoğan¹,

Başar²

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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 Beneficial use of marine dredged material in synthetic LWA production by adding industrial wastes  Improvement of the properties of LWAs with the elevation of sintering conditions  Investigation of the technical and environmental properties of the produced LWAs LWAs were ordered in a decreasing surface quality regarding their external appearence and surface texture. Sintering temperature has the major variable to obtain LWAs with smooth surface texture. All LWA series sintered at 1190°C had vitrified surface texture with no external fissures. At 1180, 1170, 1150 and 1100°C sintering temperatures, surface of aggregates were rough and some external fissures were also observed on the mantle of aggregates. Figure A. External appearance and surface texture of produced LWAs Purpose: The objective of this work is to investigate the influence of DM, FA and WFS co-utilization on the production of LWA, as well as to determine the effects of sintering temperature, heating rate and sintering period on the physical, mechanical, mineralogical, micro-structural and leaching properties of the produced artificial aggregates. The usage of DM as an ingredient in synthetic LWA production with the combination of DM and FA will provide valuable information for recycling industrial wastes. Theory and Methods: The constituent of the mixtures were determined according to bloating area of the Riley's ternary diagram. All LWAs were produced by using Pelletizing Disc (Elektron Lab, Turkey) operated at 43°, having 40 cm diameter and 11 cm depth. Rotating speed of the disc was 50 rpm and the obtained LWA granules had particle sizes of 5-12 mm. Results: Increase in DM content in aggregate mixtures led to decrease in strength properties and increase in weight loss and water absorption rates for all sintering conditions. Physical, mechanical, microstructural and mineralogical properties of coarse aggregates in all series were improved with the increase of sintering temperature. LWA produced under conditions of 1190ºC sintering temperature, 5ºC/min heating rate and 20 min sintering period resulted in optimum LWA properties. Conclusion: The outcomes of this study demonstrated that DM can be used as an ingredient in the production of artificial LWA with the combination of coal FA and WFS with no adverse physical, mechanical, mineralogical, microstructural and environmental impacts.

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Leachability of Heavy Metals from Lightweight Aggregates Made with Sewage Sludge and Municipal Solid Waste Incineration Fly Ash

Cited by 35 publications

References 34 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

Engineering Properties of Self-Consolidating Lightweight Aggregate Concrete and Its Application in Prestressed Concrete Members

Deniz Dibi Tarama Malzemesi, Kömür Uçucu Külü ve Atık Döküm Kumunun Hafif Agrega Olarak Geri Kazanımı

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