New possibilities of neutralisation sludge solidification technology

Dohnálková, Božena; Drochytka, Rostislav; Hodul, Jakub

doi:10.1016/j.jclepro.2018.08.095

Cited by 21 publications

(8 citation statements)

References 15 publications

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“…Zhang et al [32] proposed that the requirements of filling engineering were the UCS higher than 200 kPa and the failure strain less than 2.8% after being cured for 28 days. e minimum common standard for compressive strength in the Czech Republic is 400 kPa for the additive granulate for embankments and backfills for other constructions [20]. e minimum UCS required in the USA is 350 kPa after 28 days of curing for waste deposited on the landfill as a structural or substrate material [33].…”

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

“…ey concluded that the unconfined compressive strength (UCS) of the treated sludge after 7 days and 28 days could meet the requirement of landfilling and construction material, respectively. Dohnalkova et al [20] used cement and fly ash to solidify the neutralisation sludge and found that the solidified sludge could be used as a filler material for recultivation and installation of technological units in landfills and a buffer layer or underlayer in the construction of roads or subfloors. One of the possible engineering applications is using solidified sludge as backfill material in mine or abandoned caverns, which can solve the problem of waste disposal and the potential geologic disasters associated with sludge disposal.…”

Section: Introductionmentioning

confidence: 99%

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Durability Analysis of Sludge Solidified with Soda Residue Subjected to Dry‐Wet and Freeze‐Thaw Cycles

Zhang

2021

Advances in Civil Engineering

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Soda residue (SR), ground-granulated blast-furnace slag (GGBS), and quicklime (QL) were employed for solidifying sewage sludge, which is a technique for sustainable development by transforming industrial solid waste and sludge into engineering fill material such as backfill material in mine or abandoned caverns. The durability of solidified sludge against dry-wet and freeze-thaw cycles was investigated by unconfined compressive strength (UCS), X-ray diffraction, scanning electron microscopy, and nuclear magnetic resonance tests. The results demonstrated that the SR-GGBS-QL solidified sludge had good dry-wet and freeze-thaw durability. In general, UCS increased at first, but then it decreased to some degree with the increase in dry-wet and freeze-thaw cycles. The cycle number for peak UCS depended on the durability test types and SR content. The UCS values after seven dry-wet cycles or ten freeze-thaw cycles were higher than the initial values before cycles. The main products detected in SR-GGBS-QL solidified sludge were ettringite, hydroaluminite, and calcium silicate hydrate (C-S-H). In addition, some pollutants such as copper, arsenic, and chromium were stabilized. The weakening effect on the microstructure of the solidified sludge occurred after dry-wet or freeze-thaw cycles. However, the hydration reaction continued with the increase of dry-wet and freeze-thaw cycles, leading to an increase in the amount of hydration products (especially C-S-H) and compact microstructure. These contributed to high UCS values and good dry-wet and freeze-thaw durability. The strength and failure strain of solidified sludge still met the requirement of filling materials after dry-wet or freeze-thaw cycles.

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Section: Unconfined Compressive Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Durability Analysis of Sludge Solidified with Soda Residue Subjected to Dry‐Wet and Freeze‐Thaw Cycles

Zhang

2021

Advances in Civil Engineering

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“…The incorporation of waste foundry sands in epoxy composites can contribute to sustainable industrial growth and the production of high-quality polymer concrete [25,26]. Neutralization sludge (NS) is hazardous waste that cannot be used without its complete incorporation into other material, as there is a risk of hazardous pollutants being released into the environment [27]. Heavy metals in neutralization sludge could have a positive effect on the properties of epoxy-based materials [28].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Industrial Wastes as Fillers in the Epoxy Thermosets for Building Application

2021

Self Cite

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Epoxy resins are currently used in many areas of construction, such as resistant coatings, anchors, fibre-reinforced polymer (FRP) composites, grouts, etc. This paper deals mainly with epoxy composites that can be applied during the rehabilitation of concrete constructions. The influence of a filler type on epoxy thermoset composites was monitored, whilst three different types of epoxy resin were used in order to achieve a better representation and confirmation of the results. During the testing of fillers, these were mainly secondary raw materials, including pre-treated hazardous waste (neutralisation sludge), representing various shapes and sizes of particle, while their amount in the epoxy matrix was chosen with regard to optimal viscosity and workability. Physical and mechanical parameters, like compressive and flexural strengths, cohesion with the concrete and thermal expansion of the epoxy composites containing various fillers were determined. The microstructure of epoxy composites with a different filler type and chemical resistance against chemical aggressive media were all monitored. The microstructure of epoxy composites was monitored using scanning electron microscopy (SEM) supported by energy-dispersive X-ray spectroscopy (EDX). Computed tomography (CT) was also used for the evaluation of the cohesion of the epoxy composites with concrete and dispersion of the filler in the epoxy matrix.

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“…The dredging activities are normally performed to meet navigational needs or remove the contaminated deposits. With the rapid growth of Chinese industries, the annual production of sediment in China is up to 300 million tons and the number will continue to increase as reported [1,2]. The sediment, normally composed of fine particles, can adsorb potential contaminants such as nutrient elements and heavy metals, when present in excessive amounts.…”

Section: Introductionmentioning

confidence: 99%

Effect of Organics on Heavy Metal-Contaminated River Sediment Treated with Electro-Osmosis and Solidification/Stabilization Methods

Pan

Chen

2020

Materials

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This study focuses on the treatment of heavy metal ions and achieving enhancement of river sediment, which is rich in organics. Fulvic acid was used as the main representative of organics in which to study the transfer of Cu2+, Zn2+ ions in the electroosmotic system, in both the absence and presence of organics. In addition, the effects of the experiment parameters (i.e., voltages, displacement, and water content), heavy metal ion content (0.19% and 0.38%, respectively), and the concentration of organics (1.5%, 3%, and 4.5%) acting on migration of ions and physiochemical properties of sediment, before and after electro-osmosis treatment were investigated. Mineral composition of the soil and its microscopic characteristics were analyzed by scanning electron microscopy. The results show that the 4.5% fulvic acid added in the sediment can enhance the migration ability of Cu2+ and Zn2+ ions through complexation, and simultaneously effectively reduce the formation of colloids with the average reductions of Cu2+ ions and Zn2+ ions being 28 and 11 mg/kg, respectively. While the dewatering capacity of the sediment with higher fulvic acid content is weaker, fulvic acid can effectively reduce the corrosion of the electrode during the electro-osmosis process, due to the film formed on the metal surface. Moreover, the fulvic acid in the organics can be combined with the aluminum and calcium produced by the hydration of the cement, delaying the hydration of the cement, while simultaneously decomposing the hydration product and hindering the hardening of the cement, thereby affecting and destroying the formation of the sediment’s structure and its strength.

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New possibilities of neutralisation sludge solidification technology

Cited by 21 publications

References 15 publications

Durability Analysis of Sludge Solidified with Soda Residue Subjected to Dry‐Wet and Freeze‐Thaw Cycles

Durability Analysis of Sludge Solidified with Soda Residue Subjected to Dry‐Wet and Freeze‐Thaw Cycles

Recovery of Industrial Wastes as Fillers in the Epoxy Thermosets for Building Application

Effect of Organics on Heavy Metal-Contaminated River Sediment Treated with Electro-Osmosis and Solidification/Stabilization Methods

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