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Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way
Published on: November 21, 2017
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Optimization of bio-cement production from cement kiln dust using microalgae
M F Irfan1, S M Z Hossain1, H Khalid1
1Department of Chemical Engineering, College of Engineering, University of Bahrain, Bahrain.
Biotechnology Reports (Amsterdam, Netherlands)
|July 18, 2019
Summary
This study maximized bio-cement production using microalgae and cement kiln dust (CKD). Optimized conditions yielded 25.18g CaCO3, enhancing cement
Area of Science:
- Biotechnology and Materials Science
- Environmental Engineering
Background:
- Cement production generates significant waste, including cement kiln dust (CKD).
- CKD contains calcium, a key component for bio-cement production.
- Microalgae offer a sustainable biological pathway for mineral precipitation.
Purpose of the Study:
- To optimize bio-cement (CaCO3) production using microalgae (Chlorella kessleri) and CKD as a calcium source.
- To investigate the impact of cultivation parameters (temperature, pH, time) on CaCO3 yield.
- To evaluate the potential of CKD-derived bio-cement in improving conventional cement properties.
Main Methods:
- Response Surface Methodology (RSM) with Central Composite Design (CCD) for process optimization.
- Single-factor experiments to determine optimal microalgae cultivation conditions.
- Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Energy Dispersive X-ray Spectroscopy (EDS) for material characterization.
- Mechanical testing to assess compressive strength of cement mixed with bio-cement.
Main Results:
- Maximum CaCO3 yield of 25.18g achieved at 23°C, pH 10.63, and day 9.
- Optimized conditions led to 96% calcium extraction from CKD.
- Bio-cement incorporation significantly enhanced the compressive strength of conventional cement.
- Increased cement to bio-cement ratio further improved compressive strength.
Conclusions:
- Microalgae cultivation coupled with CKD offers an effective route for sustainable bio-cement production.
- Optimized process parameters are crucial for maximizing CaCO3 yield and calcium extraction.
- CKD-derived bio-cement shows promise for improving construction material performance and reducing environmental pollution.
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