Encouraging microbial activity in cementitious systems: an emerging frontier in contaminated soil treatment

Kogbara, Reginald B.

doi:10.1002/jctb.4015

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…As a result, there are concerns regarding the long-term effectiveness of S/S treatment due to uncertainties in a number of areas like test methods, observed deficiencies in the process application, observed lack of chemical binding in crushed samples of treated wastes, and uncertainties of performance arising from anticipated behavioural degradation of the material over time (Perera et al 2005a). Consequently, recent studies have also considered combining S/S and biodegradation in order to achieve some form of (organic) contaminant attenuation over time (Kogbara 2013).…”

Section: Cemi S/s Treated Contaminated Soilsmentioning

confidence: 99%

A review of the mechanical and leaching performance of stabilized/solidified contaminated soils

Kogbara

2014

Environ. Rev.

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Stabilization/solidification (S/S) technology, which basically involves chemical fixation and immobilization of contaminants (primarily metals) in the matrix of cementitious binders, is widely used for treatment of contaminated soils. This paper presents a critical review of the performance of commonly used blended binder systems in S/S technology. The binders considered are Portland cement and blends of cement–fly ash, cement–slag, lime–slag, and lime–fly ash. This work compares and evaluates the performance of contaminated soils treated by the binders in terms of commonly used mechanical and leaching properties, including unconfined compressive strength (UCS), bulk density, hydraulic conductivity, and leachability. The long-term performance of S/S-treated soils is also reviewed. It was observed that the inclusion of slag in a binder blend gave superior performance compared to fly ash. Generally, the leachability of common contaminants in soil can be reduced to acceptable levels with approximately 20%–35% dosage of the different binders. The UCS was observed to be optimum around the optimum water content for compaction. The hydraulic conductivity was approximately 10−9 m/s over time. Long-term performance of treated soils showed consistent effectiveness over a period of 5–14 years with fluctuations in mechanical and leaching behaviour caused by the complex nature and variability of S/S-treated soils.

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Section: Cemi S/s Treated Contaminated Soilsmentioning

confidence: 99%

A review of the mechanical and leaching performance of stabilized/solidified contaminated soils

Kogbara

2014

Environ. Rev.

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“…Besides, numerous abiotic factors including irreversible sorption of contaminants to the cementitious matrix, volatilization, and reductive dichlorination of chlorinated organic in the presence of Fe (II) [32] were implicated in the contaminant losses in previous studies treating artificially contaminated soils with two organic contaminants such as 2chlorobenzoic acid and phenol [31]. Nonetheless, the previous study [30] only used bacteria as the degrading agents in the S/S matrices.…”

Section: Activated Sludge (As) Pseudomonasmentioning

confidence: 99%

Potential of the Bioaugmentation Method to Enhance the Remediation Process in the Solidification/Stabilization Method

Mohd Rais,

Rachman,

Mohd Kamil

2023

IJSCET

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In the published literature, Stabilization/Solidification (S/S) method was excellent in remediating heavy metals, whereas bioremediation was excellent in remediating organic contaminants. However, tremendous papers onlyfocus on specific contaminants, while the polluted environment is not due to specific contaminants. In this paper, both methods were combined and targeted to remediate both group contaminants, namely organic contaminants and heavy metals. The study focused on the effect of the bioaugmentation method on S/S method with the use of Portland cement as a binder in the S/S method. Sphingobacterium spiritivorum(bacteria) and Aspergillus brasiliensis(fungi) as degrading agents in the bioaugmentation method. The S/S matrices were tested for leaching behaviour which is the concentration of Chemical Oxygen Demand (COD) and heavy metals after 14 and 28 days of hydration. Bacteria augmentation showed a better COD removal compared to without augmentation (S/S method only). Bacteria augmentation also shows better removal compared to fungi augmentation for both hydration days. In addition, by using the S/S method only, COD concentration was increased from 14 to 28 days. For heavy metals, chromium shows a positive result; bacteria augmentation shows the lowest concentration after 14 and 28 days of hydration. While other metals, S/S method only shows the lower concentration compared to samples that augment with bacteria and fungi. Nonetheless, the concentrations of heavy metals in all samples did not exceed the USEPA limit. Therefore, this study contributed to the possibility of combining the S/S and bioaugmentation methods by adding degrading agents to remediate contaminants in the sludge, especially for sludge that containshigh organic contaminants.

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“…(Perera et al, 2005) identified various mechanisms that could impair the long-term efficiency of S/S. CO2 uptake leads to carbonation, reducing the initial alkalinity of specific materials (Kogbara, 2013;Kogbara et al, 2012). The possible health and environmental effects of contaminants generated in the petroleum industries, mainly drill cuttings, have accelerated awareness and criticism among communities.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Oil Well Drill Cuttings Utilizing Different Binder Options

Abdullah

Othman

Abdullah

2022

SJUOZ

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A lab-scale treatability experiment was conducted on oil well drill cuttings (waste generated during petroleum exploration) using two different binders (Portland Cement and Lime) as a Solidification and Stabilization S/S agent. Seven ratios for each binder to waste (Drill cuttings) have been separately prepared (0.25:10, 0.5:10, 1:10, 2:10, 3:10, 4:10, 5:10) in which effects for each ratio and curing time (90 days) have been investigated on pH, chloride, and leachate for heavy metals (Ba, Pb, Cd, Ag, and Cr) through Toxicity Characteristic Leaching Procedure (TCLP). Results presented that the leaching of heavy metals (Ba, Cd, Cr, and Ag) was under the US EPA TCLP limit for all ratios with both binders. However, the Pb for the ratios of 0.25:10, 0.5:10, 2:10, and 3:10 for the cement-treated drill cuttings and 0.25:10 and 0.5:10 for the lime-treated drill cuttings have exceeded the proposed limit by the US EPA TCLP limit. Chloride also failed to meet the Nigerian chloride limit for drill cutting with the ratios 0.25:10, 0.5:10, 1:10, and 2:10 for both binders; meanwhile, the chloride concentrations were under the same limit within the ratios 3:10, 4:10, and 5:10. The overall results indicated that the binder options had affected the S/S product. Furthermore, the ratios of 1:10 and 2:10 had better performance considering the weight of the binders used for both options. The ratios of 4:10 and 5:10 had also performed well, but due to the significant quantities of the binders used, these ratios will not be considered economically feasible. The present investigation demonstrated that both binders could be used and relied on as an S/S agent aiming at treating drill cuttings. TRANSLATE with x English Arabic Hebrew Polish Bulgarian Hindi Portuguese Catalan Hmong Daw Romanian Chinese Simplified Hungarian Russian Chinese Traditional Indonesian Slovak Czech Italian Slovenian Danish Japanese Spanish Dutch Klingon Swedish English Korean Thai Estonian Latvian Turkish Finnish Lithuanian Ukrainian French Malay Urdu German Maltese Vietnamese Greek Norwegian Welsh Haitian Creole Persian TRANSLATE with COPY THE URL BELOW Back EMBED THE SNIPPET BELOW IN YOUR SITE Enable collaborative features and customize widget: Bing Webmaster Portal Back

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Encouraging microbial activity in cementitious systems: an emerging frontier in contaminated soil treatment

Cited by 9 publications

References 21 publications

A review of the mechanical and leaching performance of stabilized/solidified contaminated soils

A review of the mechanical and leaching performance of stabilized/solidified contaminated soils

Potential of the Bioaugmentation Method to Enhance the Remediation Process in the Solidification/Stabilization Method

Treatment of Oil Well Drill Cuttings Utilizing Different Binder Options

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