Reuse of dewatered sewage sludge conditioned with skeleton builders as landfill cover material

Li, Y. L.; Liu, J. W.; Chen, J. Y.; Shi, Yafei; Mao, Wei; Liu, H.; Li, Y.; Shu, He; Yang, Jiakuan

doi:10.1007/s13762-013-0199-y

Cited by 43 publications

(10 citation statements)

References 28 publications

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“…The safe disposal of SS has become an important issue affecting sustainable environmental management [5][6][7][8][9] . As an effective method, the solidification/stabilization treatment by mixing into a binder is widely used in the world to realize the resource utilization of SS [10][11][12] .…”

Section: Strength and Microstructure Properties Of Solidified Sewage mentioning

confidence: 99%

“…After adding the binder, the solidified waste can undergo a series of physicochemical reactions, which can stabilize the incorporated toxic substances and improve the mechanical property of SS simultaneously [12][13][14][15][16] . Then the physical and chemical properties of the SSS meet the requirements for disposal in a landfill or use in engineering applications, such as for bricks, subgrade and landfill cover 11,[17][18][19][20][21] . Lim 15 reported that the unconfined strength of the solidified sludge by fly ash and loess satisfied the criteria for construction materials, which was above 100 kPa.…”

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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“…Typically, S/S technology for a viable choice was adopted to solve sludge processing and local material shortages, while changing the waste into a valuable resource for utilization as construction materials [12], such as landfill and pavement construction [13][14][15]. Most previous studies mainly concentrated on cement, coal residue, and fly ash [16][17][18] for binders, while ignoring other industrial waste. Ground granulated blastfurnace slag (GGBS) has been claimed to achieve a remarkable performance to stabilize soft soil [19,20].…”

Section: Introductionmentioning

confidence: 99%

Solidification/Stabilization of Textile Sludge as Subgrade: Usage of Binders and Skeleton Material

Cheng

Chen

et al. 2020

Advances in Civil Engineering

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This study investigates the disposal of textile sludge via laboratory and field tests while protecting the eco-environment. Solidification/stabilization (S/S) technology and skeleton construction method are introduced to investigate the application of S/S sludge for subgrade material. S/S is to enhance the sludge strength and stabilize the metal(loid)s and hazardous organics in the textile sludge. Skeleton construction method aims to decrease the liquid-solid ratio in mixture to reduce the binder dosage and save binder cost. In the laboratory, binders and skeleton material are implemented to investigate the differences in unconfined compressive strength (UCS) to explore the optimal mixture. Results illustrate that UCS of binder-sludge is below 100 kPa and enhanced more than 400 kPa after adding gypsum and skeleton material. Skeleton soil material with high plasticity index and low moisture content improves UCS significantly. Scanning electron microscopy test shows the physical microstructure of sludge is greatly improved for the particular space grid structure formed by the particles and cementitious products. The leaching test shows the metal(loid)s and organics in leachate are decreased after S/S treatment and below the standard value. Finally, the textile sludge was disposed for subgrade via the technology. The strength and leaching results of field tests are in good agreement with the laboratory results. The bearing capacity of the practical subgrade meets the design requirements.

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“…Sewage sludge can be viewed as a resource for land use in agriculture, biomass, and value-added products. (Barnab et al 2009;Garfí et al 2011;Li et al 2014). However, it is necessary to consider residual contaminants when sewage sludge is released into the environment, due to their direct environmental harms or potential risks to the safety of the environment (Heberer 2002).…”

Section: Introductionmentioning

confidence: 99%

Removal of typical pharmaceutically active compounds in sewage sludge using mesophilic and thermophilic anaerobic digestion processes

Zhou

Wang

et al. 2014

Int. J. Environ. Sci. Technol.

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The removal of four pharmaceutically active compounds, i.e., anti-inflammatory painkiller diclofenac (DCF), lipid-regulating agent clofibric acid (CFA), epilepsy drugs carbamazepine (CBM), and broad-spectrum anti-bacterial agent triclosan (TCS), present in sewage sludge was investigated using anaerobic digestion processes in the mesophilic and thermophilic modes. Sludge retention times (SRTs) were set at 10, 15, and 20 days, respectively, for the mesophilic mode and 7, 15, and 20 days, respectively, for the thermophilic mode. The effective isolation and purification pre-treatment to extract the target compounds from the sewage sludge samples were firstly established, followed by gas chromatographymass spectrometer analysis to identify and quantify them. The removal efficiencies of the target compounds could be raised to a certain extent with the increase on SRTs, especially under the mesophilic condition. The removal of CFA and TCS under thermophilic condition hardly varied when the SRTs were above 15 days. All the compounds could be partly removed from the sewage sludge under the two temperature conditions, particularly TCS that was reduced by about 74 %. Besides, CFA, firstly reported in this study, could be reduced by maximal 65 %. On the whole, the thermophilic mode was more conducive to the removal of CBM and TCS, but did not have a noticeable effect on the removal of CFA. Furthermore, DCF could be better removed in the mesophilic mode. In addition, NH 3 -N accumulation in this measured range might positively affect the removal of the selected compounds, particularly in the mesophilic mode.

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Reuse of dewatered sewage sludge conditioned with skeleton builders as landfill cover material

Cited by 43 publications

References 28 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/Stabilization of Textile Sludge as Subgrade: Usage of Binders and Skeleton Material

Removal of typical pharmaceutically active compounds in sewage sludge using mesophilic and thermophilic anaerobic digestion processes

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