Direct reuse of two deep-dewatered sludge cakes without a solidifying agent as landfill cover: geotechnical properties and heavy metal leaching characteristics

Yang, Jiakuan; Zhang, Shinan; Shi, Yafei; Li, Chao; Yu, Wenbo; Guan, R.; Xiao, Jun; Liang, Sha; Hu, Jingping; Hou, Huijie; Hu, Jiukun

doi:10.1039/c6ra26480h

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…Yijun Chen 1,3,4,5* , Xingxing He 1,2* , Shaohua Zhang 5 , Xun Tan 1,2 & Yong Wan 1,3,4 Solidification treatment with cementitious binder is an effective way to reduce environmental hazards of sewage sludge. Two cementitious binders, i.e., ordinary Portland cement (OPC) and sulfo-aluminate cement (SAC), were compared in this study to treat the sewage sludge.…”

Section: Strength and Microstructure Properties Of Solidified Sewage mentioning

confidence: 99%

“…Sewage sludge (SS) produced by water treatment plants tends to be characterized by high water content and high organic matter, showing the characteristics of easy flow and poor engineering strength [1][2][3] . In addition, some SS may also contain toxic and hazardous pollutants including microorganism, pathogen and heavy metals that may pollute the environment 4 .…”

Section: Strength and Microstructure Properties Of Solidified Sewage mentioning

confidence: 99%

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Strength and microstructure properties of solidified sewage sludge with two types of cement-based binders

Chen

Zhang³

et al. 2020

Sci Rep

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Solidification treatment with cementitious binder is an effective way to reduce environmental hazards of sewage sludge. Two cementitious binders, i.e., ordinary Portland cement (OPC) and sulfo-aluminate cement (SAC), were compared in this study to treat the sewage sludge. The strength of solidified sewage sludge (SSS) and changes in microscopic characteristics before and after treatment were analyzed through microscopic analysis methods. The effect of organic matter in sludge on the strength of SSS were also discussed. The results showed that the strength of SSS were lower than that of the solidified clay with no organic matter, and the filtrate extracted from the sludge can also weaken the cementation of the two cements significantly. The solidification effect of the OPC on the sludge was lower than that of the SAC evidently. The organic matter in the sewage sludge caused the surface of the soil particles to carry a large negative potential, which interfered with the hydration of the binder and reduced the amount of cementation skeleton formed by the binder hydration products. This resulted in a porous structure with low mechanical strength. The amount of early hydration product formed in the SAC-based solidified samples was higher than that of the OPC-based samples. This was favorable for filling the pores of the solidified samples and increasing their density. SAC had a better compatibility with soft soil containing high organic matter than OPC, and the which provides an effective alternative binder for dealing with sewage sludge.

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Section: Strength and Microstructure Properties Of Solidified Sewage mentioning

confidence: 99%

Section: Strength and Microstructure Properties Of Solidified Sewage mentioning

confidence: 99%

Strength and microstructure properties of solidified sewage sludge with two types of cement-based binders

Chen

Zhang³

et al. 2020

Sci Rep

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“…One of the focuses of current social research is wastewater treatment, which is currently a hotspot for scientific research [1]. The polyvinyl alcohol (PVA) nanofiber membrane was prepared by using electrospinning technology, the adsorption of Pb 2+ and Cu 2+ in wastewater was studied and the effects of different preparation processes on the diameter, uniformity and fibre morphology of PVA nanofibers were studied [2]. At the same time, the adsorption performance, model and adsorption kinetics of Pb 2+ nanofiber membrane on Pb 2+ and Cu 2+ , the regulation and characterisation of PVA nanofibers in water morphology and the characterisation of PVA-g-POSS nanofibers and the adsorption properties of Pb 2+ and Cu 2+ were also studied [3].…”

Section: Introductionmentioning

confidence: 99%

Solidification treatment effect of wellsite waste mud based on physical adsorption of a composite curing agent

Liu

Zhang

2022

Applied Mathematics and Nonlinear Sciences

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In order to improve the physical adsorption of the composite curing agent and improve the solidification treatment effect of the waste mud, the adsorption materials and adsorption processes were studied. Through the study of orthogonal experiments, the effects of polyvinyl alcohol (PVA) concentration, spinning voltage, spinning distance and other factors on the diameter, fibre uniformity and fibre morphology of PVA nanofibers were explored, with the optimal preparation conditions for the preparation of PVA nanofibers studied. The adsorption properties of PVA nanofibers for Pb2+ and Cu2+ were studied, and the Langmuir and Freundlich theoretical models were used to fit the adsorption isotherms to determine the adsorption model; the adsorption kinetics were fitted using quasi-first-order and quasi-second-order kinetic equations to determine the type of adsorption. The research has a theoretical reference for the exploration of the physical adsorption of composite curing agents and the solidification of waste mud.

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“…Large amounts of sewage sludge are generated during the biological treatment process of municipal wastewater, the treatment and disposal of sewage sludge has become a serious problem in many countries and regions (Zheng et al 2007;Yang et al 2017). Land application is considered as an economical way for sludge disposal due to its high contents in nutrients and organic materials (Laurent et al 2011;Zhang et al 2015;Ali et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

Qiu

Zheng

Wang

et al. 2021

Water Science and Technology

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The migration, transformation and ecological risk of heavy metals (Cr, As, Ni, Cu, Zn, Cd and Pb) in the sewage sludge during the microwave-assisted thermal hydrolysis process were investigated under different temperatures (80 °C, 100 °C, 120 °C, 140 °C, and 160 °C). The potential relationship between the bio-availability of heavy metals and the variables of microwave treatment, including pH, ammonium-nitrogen, soluble chemical oxygen demand, pH, soluble protein, soluble polysaccharide and volatile solid, was also explored. The results showed that the migration of heavy metals between solid-liquid phase mainly depended on the temperature. The percentage of all heavy metals (except Cu) in mobile (acid-soluble/exchangeable and reducible) forms decreased after microwave-assisted thermal hydrolysis treatment. The solubilization of compounds with C = O and O-H accompanied with the generation of organic and inorganic metal halides were also observed in the treated sludge through fourier transform infrared spectroscopy analysis. NH4+-N showed the highest negative correlation to the bio-availability of most heavy metals (except Cu and Cr) with coefficients (absolute value) over 0.87 (P < 0.05). VS showed a positive correlation to the bio-availability of most heavy metals (except Cu). The total potential ecological risk index (RI) decreased by 46.65% after microwave treatment at 160 °C.

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Direct reuse of two deep-dewatered sludge cakes without a solidifying agent as landfill cover: geotechnical properties and heavy metal leaching characteristics

Abstract: The skeleton builders improve the geotechnical properties and heavy metal leaching characteristics of the dewatered sludge cakes which make them appropriate for re-use as landfill cover materials after a certain curing time.

Cited by 7 publications

References 20 publications

Strength and microstructure properties of solidified sewage sludge with two types of cement-based binders

Strength and microstructure properties of solidified sewage sludge with two types of cement-based binders

Solidification treatment effect of wellsite waste mud based on physical adsorption of a composite curing agent

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

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