Study on the antiseepage mechanism of the PBFC slurry for landfill site

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744087 ◽  
Author(s):  
Guozhong Dai ◽  
Weicheng Shi ◽  
Xiaoshu Jiang ◽  
Guicai Shi ◽  
Yaxing Zhang
Keyword(s):  
Heavy Metal ◽  
Compressive Strength ◽  
Fly Ash ◽  
Polyvinyl Alcohol ◽  
Metal Ions ◽  
Sodium Carbonate ◽  
Heavy Metal Ions ◽  
Landfill Site ◽  
Low Permeability ◽  
Coefficient Of Permeability

In order to develop a kind of slurry with low permeability which has some adsorption and retardation to the pollutants in leachate to be used in antiseepage engineering of leachate for landfill site, experiments based on orthogonal method were performed. The optimal PBFC slurry was selected: bentonite 18–26%, cement 16–24%, fly ash 18–20%, TOJ800-10 water reducing agent 0.01–0.03%, polyvinyl alcohol 0.2–0.8%, sodium carbonate 0.8–1.5% and water 680–780/1000 mL seriflus. The material has good groutability and a concretion stone ratio which is greater than 99.6%. The coefficient of permeability of 28-day concretion body is 0.53 × 10[Formula: see text]–1.86 × 10[Formula: see text] cm/s and the compressive strength is 0.64–1.04 MPa. The slurry has good adsorption and retardation properties. The block rate of NH4-N and phosphorus reached 98.28%, and the block rate of CODCr and BOD5 reached 85.67%. The block rate of Hg, Pb and other heavy metal ions reached 99.8%. The PBFC slurry improved the retardation capability of the pollutants of the leachate at the landfill site by its infiltration sedimentation and adsorption fixation.

Study on the Mechanical Properties and Heavy Metal Ions Immobilization Capability of Solidified Body for MSWI Fly Ash with Geopolymer

2021 ◽  
Vol 1036 ◽  
pp. 301-308
Author(s):  
Qing Wang ◽  
Xin Rui Wang ◽  
Hai Cao ◽  
Zhao Yang Ding ◽  
De Yong Kong
Keyword(s):  
Heavy Metal ◽  
Compressive Strength ◽  
Fly Ash ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Waste Incineration ◽  
Raw Material ◽  
Polymerization Reaction ◽  
Mswi Fly Ash ◽  
Solidified Body

In this study, municipal solid waste incineration fly ash (hereinafter called MSWI fly ash) was used as a main raw material, and it was prepared into a solidified body for MSWI fly ash with geopolymer by a single-component chemical alkali excitation method. The results were shown that when the content of MSWI fly ash was 50%, SiO2/Al2O3 was between 3.51-4.04, and Na2O/Al2O3 was between 0.24-0.30, with the increasing of SiO2/Al2O3 and Na2O/Al2O3, the 28d compressive strength of the solidified body showed a trend of increasing first and then decreasing, the maximum 28d compressive strength was 17.7MPa. When SiO2/Al2O3 was 4.04 and Na2O/Al2O3 was 0.30, the minimum leaching concentrations of Pb2+ and Cd2+ were 0.018mg/L and 0.027 mg/L. When the content of MSWI fly ash was increasing, the 28d compressive strength of the solidified body gradually decreased, and the heavy metal ions leaching concentration gradually increased. The result of XRD and FTIR indicated that the MSWI fly ash was involved in the polymerization reaction, and the heavy metal ions in MSWI fly ash were also chemically solidified into the geopolymer structure.

scholarly journals Synthesis of Zeolite from Fly Ash and Removal of Heavy Metal Ions from Newly Synthesized Zeolite

2010 ◽  
Vol 7 (4) ◽  
pp. 1200-1205 ◽  
Author(s):  
Parag Solanki ◽  
Vikal Gupta ◽  
Ruchi Kulshrestha
Keyword(s):  
Heavy Metal ◽  
Fly Ash ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Coal Fly Ash ◽  
Proximate Analysis ◽  
13X Zeolite ◽  
Alkali Fusion ◽  
Type Zeolite ◽  
The Cost

Coal fly ash was used to synthesize X-type zeolite by alkali fusion followed by hydrothermal treatment. Characteristics of the various Fly ash samples were carried out. Coal proximate analysis was done. Batch experiment was carried out for the adsorption of some heavy metal ions on to synthesized Zeolite. The cost of synthesized zeolite was estimated to be almost one-fifth of that of commercial 13X zeolite available in the market.

Experimental Research on Engineering Property of Heavy Metal-Contaminated Kaolinite

2011 ◽  
Vol 94-96 ◽  
pp. 1921-1929 ◽  
Author(s):  
Zhi Bin Liu ◽  
Xin Ma ◽  
Wen Long Dai
Keyword(s):  
Heavy Metal ◽  
Compressive Strength ◽  
Electrical Resistivity ◽  
Metal Ions ◽  
Unconfined Compressive Strength ◽  
Heavy Metal Ions ◽  
Engineering Property ◽  
Contamination Concentration ◽  
Expansion Capacity

Due to release and accumulation of industrial contaminants in natural soil in some regions, and the long-term interaction between leachate and clay which is adopted as isolation material of contaminants, the engineering property variation of clay soils after having been polluted by heavy metal ions gradually has drawn more and more attention of environmental geotechnical engineers. With relatively high chemical stability and low expansion coefficient kaolinite is widely distributed and usually used in engineering practice. In this research, Pb, Zn, and Cu-contaminated kaolinite specimens of controlled initial dry density and water content were manually prepared through static compaction. Then expansion capacity, unconfined compression, electrical resistivity and one-dimensional consolidation tests were conducted. It is found that the expansion capacity of contaminated kaolinite is influenced by the type and concentration of heavy metal ion. The unconfined compressive strength of heavy metal-contaminated kaolinite is decreased in a short period, but it may increase in a long term. Unconfined compressive strength of the same type of heavy metal-contaminated kaolinite will change with the contamination concentration. The electrical resistivity of kaolinite would be decreased when contaminated by heavy metal ions. The higher the contamination concentration is, the lower the electrical resistivity will be. All the compression indexes of heavy metal-contaminated kaolinite become lower than that of the clean kaolinite, and it also depends on both the type of heavy metal and contamination concentration. For the three types of heavy metal ions, Pb has the greatest influence on the engineering property of kaolinite, while the effects of Zn and Cu are quite similar.

Stabilized nanofibers of polyvinyl alcohol (PVA) crosslinked by unique method for efficient removal of heavy metal ions

2020 ◽  
Vol 33 ◽  
pp. 101111 ◽  
Author(s):  
Sana Ullah ◽  
Motahira Hashmi ◽  
Nadir Hussain ◽  
Azeem Ullah ◽  
Muhammad Nauman Sarwar ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Polyvinyl Alcohol ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Efficient Removal ◽  
Unique Method

Sorption Properties of Fly Ash Microspheres of Thermal Power Plants

2019 ◽  
Vol 23 (1) ◽  
pp. 50-54 ◽  
Author(s):  
A.I. Fomenko ◽  
L.I. Sokolov
Keyword(s):  
Heavy Metal ◽  
Fly Ash ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Power Plants ◽  
Thermal Power ◽  
Sorption Properties ◽  
Thermal Power Plants ◽  
Iron Ions ◽  
Quantitative Characteristics

The sorption characteristics of aluminosilicate microspheres of fly ash from thermal power plants with respect to heavy metal ions were studied with a view to their subsequent use for integrated treatment of household and industrial wastewater. The mechanism and kinetics of the sorption of total iron ions from aqueous solutions are studied, quantitative characteristics of the sorption capacity and adsorption equilibrium constants are obtained. It has been established that aluminosilicate microspheres of fly ash possess sorption properties with respect to common iron ions. The sorption isotherm of iron ions from water by the material under study is characteristic of microporous sorbents. The quantitative characteristics of the sorption process allow us to conclude about the possibility of using aluminosilicate fly ash microspheres without any additional treatment for the purification of waste water from heavy metal ions.

scholarly journals Vertical Distibution and Behavior of Heavy Metal Ions in the Layer of Nanjido Landfill Site.

2001 ◽  
Vol 37 (1) ◽  
pp. 1-8
Author(s):  
KWEON JUNG ◽  
YOUNG C.CHANG ◽  
YOUNG S.YOO ◽  
KAZUHIRO TAKAMIZAWA
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Landfill Site ◽  
And Behavior

scholarly journals Synthesis of ZIF-8/Fly Ash Composite for Adsorption of Cu2+, Zn2+ and Ni2+ from Aqueous Solutions

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 214 ◽  
Author(s):  
Caili Wang ◽  
Runquan Yang ◽  
Huaifa Wang
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Fly Ash ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Energy Dispersive Spectrometer ◽  
Average Crystallite Size ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Nickel Ions

In this study, fly ash (FA) coated with ZIF-8 (ZIF-8/FA) nanocomposite was first synthesized by taking 2-methylimidazole and zinc nitrate hexahydrate as reactants and then used as an adsorbent for adsorption of copper, zinc, and nickel ions from aqueous solution. The characteristic of FA and ZIF-8/FA samples were analyzed based on the data from scanning electronic microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, grain size analyzer and N2 adsorption-desorption isotherm. The results showed that ZIF-8 deposited on the FA evenly. The average crystallite size of ZIF-8 on the surface of FA is 15.85 nm. The specific surface area of FA was increased from 1.8 to 249.5 m2/g. The adsorption efficiency of the ZIF-8/FA nanocomposite for the removal of heavy metal ions from aqueous solution was optimized in terms of different parameters such as pH, adsorbent dosage, and contact time. It was shown that the saturated adsorption amounts of the obtained composite for adsorption of Cu2+, Zn2+, and Ni2+ are 335, 197, and 93 mg·g−1. ZIF-8/FA had better stability and more mesoporous volume than that of ZIF-8 and exhibited higher rate for adsorption of heavy metal ions from aqueous solution than FA and ZIF-8, suggesting an adsorption synergy between ZIF-8 and FA. The adsorption mechanism of heavy metal ions by ZIF-8/FA includes surface adsorption, pore adsorption, and ion exchange. The obtained ZIF-8/FA nanocomposite can solve the encountered problems of FA for low adsorption and the difficult recycling of ZIF-8 for their small size, high cost, and poor stability.

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