Performance of lime-BHA solidified plating sludge in the presence of Na2SiO3 and Na2CO3

Piyapanuwat, Rungroj; Asavapisit, Suwimol

doi:10.1016/j.jenvman.2011.04.004

Cited by 6 publications

(10 citation statements)

References 18 publications

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“…From the cumulative log-log data evaluation (Fig. 11), a linear regression analysis allowed us to calculate the slopes (with associated standard deviations), which appear in Table 2 [55][56][57]. A surface washing-off process can take place at the very early stages involving the dissolution of the most of the soluble material on the surface.…”

Section: Leaching Testsmentioning

confidence: 99%

Encapsulation, solid-phases identification and leaching of toxic metals in cement systems modified by natural biodegradable polymers

Lasheras-Zubiate¹,

Navarro-Blasco²,

Fernández³

et al. 2012

Journal of Hazardous Materials

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Section: Leaching Testsmentioning

confidence: 99%

Encapsulation, solid-phases identification and leaching of toxic metals in cement systems modified by natural biodegradable polymers

Lasheras-Zubiate¹,

Navarro-Blasco²,

Fernández³

et al. 2012

Journal of Hazardous Materials

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“…This resulting from the highly alkali environment induced by Na 2 CO 3 which enhances the

{SiO}_{4}^{-}

ion dissolves from BHA surface, allowing the C‐S‐H gel to form. Additionally, the Ca 2+ ion from the CCR can react with

{CO}_{3}^{2 -}

available from Na 2 CO 3 and forms CaCO 3 which acts as a micro filler in the cement matrix, providing additional strength .…”

Section: Resultsmentioning

confidence: 99%

Alkali‐activated composites of calcium carbide and black rice husk ash for immobilizing electroplating sludge

Piyaphanuwat

Asavapisit

2018

Env Prog and Sustain Energy

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This study investigated the use of two waste products, black rice husk ash (BHA) from biomass power plants and calcium carbide residue (CCR) from acetylene gas production as an alkali‐activated binder to solidify and stabilize the heavy metal plating sludge (PS) from electroplating plants. Optimum strength of the alkali‐activated product was obtained using a weight percentage ratio of CCR to BHA of 60:40. CCR‐BHA compacts containing 50 wt % PS developed strength after 3 days, but the addition of 2 wt % Na2SiO3 or 4 wt % Na2CO3 developed strength in all the samples after 1 day. The CCR‐BHA paste containing 50 wt % PS developed a 7‐day strength >0.35 MPa in the sample containing 4 wt % Na2SiO3 and the same strength was developed after 3 days in the sample containing 4 wt % Na2CO3. The Cr concentration of leachate from all the samples was greater than the regulatory limit except for the CCR‐BHA paste containing 50 wt % PS and 4 wt % Na2CO3. After contacted all samples with synthetic acid rain, less corroded surface was observed from sample containing Na2SiO3 and Na2CO3. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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“…Silva et al (3) showed high efficiency of a two-phase sludge solidifi cation method that included clay and lime in the fi rst step and Portland cement, sand, and water in the second. Other authors (29) found that hydrated lime and black rice husk ash in the presence of either Na 2 SiO 3 or Na 2 CO 3 activators signifi cantly reduced heavy metals leaching, especially of zinc, which was immobilised in the form of calcium zincate and calcium zinc silicate.…”

Section: Sd-standard Deviation; Rsd-relative Standard Deviationmentioning

confidence: 95%

Inertisation of galvanic sludge with calcium oxide, activated carbon, and phosphoric acid

Oreščanin¹,

Mikelić

Kollar

et al. 2012

Archives of Industrial Hygiene and Toxicology

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In this study we compared three methods for the treatment of electroplating sludge highly loaded with zinc and iron: (1) calcium oxide-based solidifi cation/stabilisation; (2) conversion into inert material by adsorption of organic and inorganic pollutants onto activated carbon; and (3) conversion of mobile waste components into insoluble phosphates. All three methods proved highly effi cient in the conversion of hazardous waste into inert material. Under optimum treatment conditions zinc concentration in the leachate of solidifi ed waste was reduced by 99.7 % compared to untreated sludge. Zinc retention effi ciency in the waste treated with activated carbon and phosphoric acid was 99.9 % and 98.7 %, respectively. The advantages of electroplating sludge treatment with activated carbon over the other two methods are high sorption capacity, insignifi cant pH and volume changes of the sludge, and simple use.

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Performance of lime-BHA solidified plating sludge in the presence of Na2SiO3 and Na2CO3

Cited by 6 publications

References 18 publications

Encapsulation, solid-phases identification and leaching of toxic metals in cement systems modified by natural biodegradable polymers

Encapsulation, solid-phases identification and leaching of toxic metals in cement systems modified by natural biodegradable polymers

Alkali‐activated composites of calcium carbide and black rice husk ash for immobilizing electroplating sludge

Inertisation of galvanic sludge with calcium oxide, activated carbon, and phosphoric acid

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