Mixture design and treatment methods for recycling contaminated sediment

Wang, Lei; Kwok, June S.H.; Tsang, Daniel C.W.; Poon, Chi Sun

doi:10.1016/j.jhazmat.2014.09.056

Cited by 89 publications

(20 citation statements)

References 60 publications

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“…It may because the coarse aggregate was replaced by fine waterworks sludge. The appearance like mortar but not concrete, which is similar to the results obtained by Wang et al (2015). Coarse aggregate presented a significant effect on compressive strength.…”

Section: Compressive Strength Testsupporting

confidence: 88%

Biorefining Waste Sludge From Water and Sewage Treatment Plants Into Eco-Construction Material

Cheng

Huang

et al. 2019

Front. Energy Res.

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This study aims to investigate the feasibility of using different waste sludge and coal combustion residuals in eco-concrete block production. The compressive strength of the eco-concrete blocks produced by waterworks sludge, bottom and fly ashes were 36 MPa, which comply with the standard specifications for paving blocks in Hong Kong. The optimal mixing proportion (by weight) of different materials in the blocks, such as aggregates, cementitious materials, water, and fly ash was 1.1:1.0:0.5:0.22, respectively. The environmental and toxicological impacts of the final products were then evaluated according to the toxicity characteristic leaching procedure (TCLP). While several heavy metals (i.e., Hg, Cu, and Pb) have been identified in the specimens, the levels of these contaminants complied with Standards (US 40 CFR 268.48). Waste materials generated from water and sewage treatment processes and power plants are feasible to be used as ingredients for paving concrete block production. These products are environmentally acceptable and mechanically suitable for resource recovery of waste materials.

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Section: Compressive Strength Testsupporting

confidence: 88%

Biorefining Waste Sludge From Water and Sewage Treatment Plants Into Eco-Construction Material

Cheng

Huang

et al. 2019

Front. Energy Res.

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“…Average pore radius also indicates on predominant mesoporosity of all specimens as values for this parameter were in range of 20 -500 Å. Also, obtained results are in compliance with metal leaching as aged specimens did not structurally deteriorate, in greater extent, over time, which is in good correlation with Wang et al [52]. Treatments such as the Non-Local Density Functional Theory (NLDFT) provide a much more accurate approach for pore size analysis.…”

Section: Chemical Mineralogical and Structural Characterizationsupporting

confidence: 74%

Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

Kerkez

Radjenovic

Pilipović

et al. 2019

Period. Polytech. Chem. Eng.

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The objective of this study is to enable a better understanding of the effectiveness of solidification/stabilization (S/S) technique in treating polluted sediment, and provide the much needed validation of the longevity of the technology. In this research kaolinite and montmorillonite, with a certain proportion of lime, were used for S/S treatment of sediment polluted with metals. Leachability of metals was examined using the toxicity characteristic leaching procedure (TCLP) and the German standard leaching test (DIN 3841-4 S4) prescribed in national legislative. Results indicated successful S/S treatment using both clays and lime, from the aspect of all leached metals even with pH variations over time and slight changes in structural integrity of specimens. X-ray diffraction (XRD), scanning electron microscope (SEM) analyses and porosity measurement were also performed on the prepared monolithic matrices. XRD qualitative and semi-quantitative analysis proved hydration and pozzolanic product formation with increase in their content and finer crystallites formation over time. SEM analysis confirmed the presence of morphologically dense and stable structures while pore size distribution indicated on mesoporous matrices with ongoing compaction over time. Generally, structural microanalysis indicated the formation of hardened matrices over time and hydration process has been fully completed and further carbonation took place. Unconfined compressive strength measurement gave the satisfying results and matured monolite with 30 % of montmorillonite and 10 % of lime can be considered potentially applicable as non-load-bearing material. In summary, all results indicated that this kind of S/S treatment can achieve satisfactory durability and represent reliable and economically feasible technique for long-term remediation of metal polluted sediment.

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“…The XRD spectra (Figure 2c, d) shows the sharp peaks of CA (calcite) at 29.5• and 39.6 0 2θ in the 7 years matured sample containing 70% sediment with 20% fly ash and 10% lime. This shows that changes into the sediment significantly complicate the formation of C-S-H, and similar compounds due to calcium complexation by organic matter as well as hindrances by heavy metals and salt content in the sediment [20]. In both mixtures the quartz with very sharp peaks at 20.8°, 26.6°, 50.1°, 60.0° and 67.8° 2θ is mostly present.…”

Section: Resultsmentioning

confidence: 92%

Long-term performance of stabilised/solidified polluted sediment in terms of metal leachability and matrix characterization

Radjenovic¹,

Kerkez²,

Pilipovic-Tomasevic³

et al. 2017

Zas Mat

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Sustainable and economically feasible polluted sediment treatment is gaining more and more importance. Stabilization/solidification (S/S) technologies are widely used for treatment of sediment and possibilities of using low-cost and readily available materials and binders are increasingly being examined. This work is concerned with aquairing more data about long-term performance of this kind of treatment in therms of metal leaching and microstructural cnaracterization when treating sediment with fly ash and lime. Extraction potential of metals and the effectiveness of the S/S treatment applied, together with compliance with national legislative, were performed by using Toxicity Characteristic Leaching Procedure-TCLP and The German standard leaching test-DIN 3841-4 S4. Leaching test results showed that the applied S/S treatment was effective in immobilizing metals even after seven years of aging. Scanning electron microscope (SEM) and X-ray diffraction analysis confirmed that pozzolanic reactions took place during 28 days and continued along S/S mixture maturation. Compressive strength measurement further proved the treatment efficacy in terms of obtained matrix stability, which enables their subsequent use. It can be concluded that the S/S technique, with the usage abundant materials has a significant potential for treatment of metal polluted sediment.

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Mixture design and treatment methods for recycling contaminated sediment

Cited by 89 publications

References 60 publications

Biorefining Waste Sludge From Water and Sewage Treatment Plants Into Eco-Construction Material

Biorefining Waste Sludge From Water and Sewage Treatment Plants Into Eco-Construction Material

Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

Long-term performance of stabilised/solidified polluted sediment in terms of metal leachability and matrix characterization

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