Less is more: Optimising the biocementation of coastal sands by reducing influent urea through response surface method

Ashraf, Muhammad Sohail; Shah, Mansoor Ul Hassan; Bokhari, Awais; Hasan, Mudassir

doi:10.1016/j.jclepro.2021.128208

Cited by 17 publications

(8 citation statements)

References 33 publications

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“…One limitation of MICP is ammonia production, as it is a by-product of the process of urea hydrolysis which may contaminate drinking water and affect health if it seeps into groundwater. However, this can be handled by treating the effluent to remove ammonia, such as by using the response surface method (RSM) [5] or using it as a fertilizer for plants [6].…”

Section: Introductionmentioning

confidence: 99%

Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand

Zeitouny,

Lieske,

Alimardani Lavasan

et al. 2023

Geotechnics

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Microbially induced calcite precipitation (MICP) is a green bio-inspired soil solidification technique that depends on the ability of urease-producing bacteria to form calcium carbonate that bonds soil grains and, consequently, improves soil mechanical properties. Meanwhile, different treatment methods have been adopted to tackle the key challenges in achieving effective MICP treatment. This paper proposes the combined method as a new MICP treatment approach, aiming to develop the efficiency of MICP treatment methods and simulate naturally cemented soil. This method combines the premixing, percolation, and submerging MICP methods. The strength outcomes of Portland-cemented and MICP-cemented sand using the percolation and combined methods were compared. For Portland-cemented sand, the UCS values varied from 0.6 MPa to 17.2 MPa, corresponding to cementation levels ranging from 5% to 30%. For MICP-cemented sand, the percolation method yielded UCS values ranging from 0.5 to 0.9 MPa, while the combined method achieved 3.7 MPa. The strength obtained by the combined method is around 3.7 times higher than that of the percolation method. The stiffness of bio-cemented samples varied between 20 and 470 MPa, while for Portland-cemented sand, it ranged from 130 to 1200 MPa. In terms of calcium carbonate distribution, the percolation method exhibited higher concentration at the top of the sample, while the combined method exhibited more precipitation at the top and perimeter, with less concentration in the central bottom region, equivalent to 10% of a half section’s area.

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Section: Introductionmentioning

confidence: 99%

Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand

Zeitouny,

Lieske,

Alimardani Lavasan

et al. 2023

Geotechnics

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“…Consequently, the contour's red zone indicates the ideal operational parameters. The circular orbits observed in the 2D contour remain consistent across all regions of color variation, with no individual circular orbit deviating or appearing anomalous [ 79 ]. Each element examined demonstrates a noteworthy influence on the targeted response.…”

Section: Resultsmentioning

confidence: 99%

Performance enhancement and optimization of residential air conditioning system in response to the novel FAl2O3-POE nanolubricant adoption

Nugroho,

Mamat,

Xiaoxia

et al. 2023

Heliyon

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“…The R 2 was 0.9926, which indicated that the model was a good fit for the data points. 38 However, adding more data points can change the R 2 value because of model overfitting, and adjusted (0.9937) and predicted (0.9902) R 2 values can be used to prevent overfitting. In the current study, the difference between the adjusted and predicted R 2 values was less than 0.2, which demonstrated that the selected quadratic model had high accuracy.…”

Section: Resultsmentioning

confidence: 99%

“…The standard deviation was 1.04, and the coefficient of variance was 1.50%. The R 2 was 0.9926, which indicated that the model was a good fit for the data points . However, adding more data points can change the R 2 value because of model overfitting, and adjusted (0.9937) and predicted (0.9902) R 2 values can be used to prevent overfitting.…”

Section: Resultsmentioning

confidence: 99%

Ionic Liquid and Tween-80 Mixture as an Effective Dispersant for Oil Spills: Toxicity, Biodegradability, and Optimization

et al. 2022

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Chemical dispersants are used extensively for oil spill remediation. Most of these dispersants are composed of a mixture of surfactants and organic solvents, which raises concerns about aquatic toxicity and environmental impact. In this study, the toxicity and biodegradability of an oil spill dispersant composed of the surface-active ionic liquid 1-butyl-3-methylimidazolium lauroyl sarcosinate [Bmim][Lausar] and Tween-80 were investigated. In addition, important environmental factors including salinity, temperature, and wave-mixing energy were optimized to obtain maximum dispersion effectiveness. The acute toxicity against zebrafish ( Danio rerio ) showed that the developed dispersant was practically non-toxic with a median lethal dose of more than 100 mg L –1 after 96 h. The dispersant also demonstrated outstanding biodegradability of 66% after 28 days. A model was developed using a response surface methodology that efficiently ( R 2 = 0.992) related the salinity, temperature, and wave-mixing energy of seawater to dispersion effectiveness. The system was then optimized, and a high dispersion effectiveness of 89.70% was obtained with an experimental error of less than 2%. Our findings suggest that the surface-active ionic liquid and Tween-80 mixture could be a viable alternative to toxic chemical dispersants for oil spill remediation.

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Less is more: Optimising the biocementation of coastal sands by reducing influent urea through response surface method

Cited by 17 publications

References 33 publications

Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand

Impact of New Combined Treatment Method on the Mechanical Properties and Microstructure of MICP-Improved Sand

Performance enhancement and optimization of residential air conditioning system in response to the novel FAl2O3-POE nanolubricant adoption

Ionic Liquid and Tween-80 Mixture as an Effective Dispersant for Oil Spills: Toxicity, Biodegradability, and Optimization

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