Developing and classifying lightweight aggregates from sewage sludge and rice husk ash

Souza, Maelson Mendonça de; Anjos, Marcos Alyssandro Soares dos; Sá, Maria V.V.A.; Souza, Nathaly Santana Leal de

doi:10.1016/j.cscm.2020.e00340

Cited by 13 publications

(8 citation statements)

References 29 publications

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“…The appearance and internal pore distribution of some of the aggregates obtained from the trial firing are shown in Figure 11. Overall, the loss on ignition, water absorption, particle density, and bloating index of the sintered LWAs are in good agreement with the literature results for similar materials [43][44][45]. Taking particle density as an example, the results of this study ranged from 0.41 to 1.63 g/cm 3 , while those of Souza et al ranged from 0.63 to 2.01 g/cm 3 .…”

Section: The Second-stage Trial Firingsupporting

confidence: 90%

Sustainable Use of Sludge from Industrial Park Wastewater Treatment Plants in Manufacturing Lightweight Aggregates

Tang

Cheng

2022

Materials

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The aim of this study was to investigate the development of a process for manufacturing lightweight aggregates (LWAs) by incorporating sludge from wastewater treatment plants in industrial parks with reservoir sediments. The research was divided into two stages: laboratory-scale firing and large-scale firing. In the laboratory-scale stage, a high-temperature furnace was used for trial firing. In the large-scale stage, a commercial rotary kiln was used for trial firing for mass production. The test results showed that the water absorption, dry loose bulk density, and crushing strength of the sintered LWAs were 14.2–26.9%, 634–753 kg/m3, and 1.29–2.90 MPa, respectively. Moreover, the water absorption of the sintered LWAs increased as the percentage of added sludge increased. In addition, the dry loose bulk density of the sintered LWAs gradually decreased as the percentage of added sludge increased. Moreover, the results of the heavy metal toxicity characteristic leaching procedure (TCLP) dissolution test for the LWAs produced by blending 30–50% sludge were all lower than the standard value required by the Taiwan Environmental Protection Agency for general industrial waste. The strength grade of the sintered LWAs was 20 MPa. From this point of view, the sintered LWAs that were studied under the test conditions could be used as aggregates for lightweight concrete and would allow it to have a reasonable strength of greater than 20 MPa.

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Section: The Second-stage Trial Firingsupporting

confidence: 90%

Sustainable Use of Sludge from Industrial Park Wastewater Treatment Plants in Manufacturing Lightweight Aggregates

Tang

Cheng

2022

Materials

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“…However, no tests on the application of RCW in expandable lightweight aggregates were found. In recent years, several by-products have been tested in the manufacture of lightweight aggregates (LWAs) [30,[31][32][33][34]. Successful studies point out that this technique shows a high potential for waste incorporation [30,35].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and utilization prospects of red ceramic waste in lightweight aggregates: a systematic review

2022

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Red ceramic waste (RCW) is one of the main by-products generated by the production of ceramic materials. Its application in lightweight aggregates (LWAs) has not yet been tested. Thus, this review intends to evaluate the perspectives of using RCW in the manufacture of LWAs. The search was carried out in the ScienceDirect database. 47 articles were selected. A significant amount of data on the chemical, physical, mineralogical, and morphological properties of RCW are discussed. In most studies, the chemical constituents of RCW complied with the swelling parameters. The mineralogy of the residue usually has constituents capable of controlling the viscosity and aiding gas formation. The data of granulometry, microstructure, and loss of mass denote the need for special care with the methodology adopted for grinding and sintering of the residue. This review indicates that there is a high potential for the use of RCW in the manufacture of LWAs.

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“…However, the leach liquor of the heavy metals still exceeded standard after these treatment, which would lead to secondary pollution on the environment (Couvidat et al, 2016;Han et al, 2011;Kim et al, 2018). The DS is also used to make lightweight aggregates (LWAs) at present (Li et al, 2019(Li et al, , 2020Souzaa et al, 2020). The previous studies indicated that the quality of the LWAs prepared with sewage sludge (SS) showed comparable properties with that made with clay.…”

Section: Introductionmentioning

confidence: 99%

Research on the efficient water‐absorbing ceramsite generated by dredged sediments in Dian Lake–China and coal fly ash

Cai

Gao

et al. 2021

Water Environment Research

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In order to transform the dredged sediment (DS) into an efficient waterabsorbing ceramsite (EWAC), the coal fly ash (CFA) and expansion agent were used to blend, expand, and sinter with the DS in the Dian Lake-China. A new type of high EWAC was prepared with the absorption ratio of 66.71%, which was much higher than similar products. The heavy metals leaching (HML) of EWAC showed that the concentration of As was 0.90 mg/L and the Hg, Pb, Cd, and Cr were too low to be detected. The characterization analysis showed that the EWAC cross section contained a lot of hydroxyl, ether, and P-Cl hydrophilic group by Fourier transform infrared (FT-IR), scanning electron microscope (SEM), and Brunauer-Emmett-Teller (BET) specific surface area (SSA) test method. The above groups and structures could greatly improve the water absorption (WA) performance of the EWAC. What's more, the SSA of the EWAC could reach 4.468 m 2 /g. The results of Comsol Multiphysics indicated that the SSA and average pore size (APS) of the EWACs were 10 and 6 times higher than the commercial ceramsites, respectively. The research provided the utilization of the DS with technical and theoretical basis for the construction of sponge city. Practitioner points• The article was focus on the utilization of dredged sediment (DS) and coal fly ash (CFA) for the basic material preparation technology and its toxicity test as the sponge city.• First, the raw materials were the DS in Dian Lake (Kunming, Yunnan, China) and CFA (thermal power plants), which were all belonged to the hazardous solid waste and was made to the efficient water-absorbing ceramsite (EWAC).• Second, the water absorption (WA) performance of the EWAC was improved greatly whose absorption ratio was much higher than similar products reached 66.71%.

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Developing and classifying lightweight aggregates from sewage sludge and rice husk ash

Cited by 13 publications

References 29 publications

Sustainable Use of Sludge from Industrial Park Wastewater Treatment Plants in Manufacturing Lightweight Aggregates

Sustainable Use of Sludge from Industrial Park Wastewater Treatment Plants in Manufacturing Lightweight Aggregates

Characteristics and utilization prospects of red ceramic waste in lightweight aggregates: a systematic review

Research on the efficient water‐absorbing ceramsite generated by dredged sediments in Dian Lake–China and coal fly ash

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