Efficient low-concentration phosphate removal from sub-healthy surface water by adsorbent prepared based on
Benhang Li1, Yanhao Chen1, Gengbo Ren1
1School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China.
The Science of the Total Environment
|August 25, 2023
Summary
This study developed a low-cost industrial solid waste-based phosphate absorbent material (PAM) for treating low-concentration phosphorus polluted surface water. The optimized PAM effectively removes phosphorus and produces a valuable fertilizer byproduct.
Area of Science:
- Environmental Science
- Materials Science
- Water Treatment
Background:
- Low-concentration phosphorus polluted surface water (LP-SW) poses a significant global environmental challenge.
- Adsorption is a cost-effective and practical method for LP-SW remediation.
- Industrial solid wastes (ISWs) offer a sustainable source for developing novel absorbent materials.
Purpose of the Study:
- To develop an efficient and economical phosphate absorbent material (PAM) from ISWs.
- To optimize the preparation of PAM for enhanced phosphate adsorption.
- To evaluate the potential of the resulting material as a fertilizer precursor.
Main Methods:
- Synthesized PAM by combining coal ash (CA), calcium carbide slag (CS), and iron salt.
- Optimized material ratios and roasting conditions for PAM preparation.
- Characterized PAM's adsorption performance and effluent quality against environmental standards.
- Investigated adsorption mechanisms and material regeneration.
Main Results:
- Optimized PAM (Fe/CC-2opt) demonstrated high phosphate adsorption efficiency.
- Effluent met surface water quality standards (pH 6.0-9.0).
- Iron sulfate addition promoted brushite formation (fertilizer potential) over hydroxyapatite.
- Adsorption mechanisms included surface precipitation, complexation, and electrostatic interactions.
- PAM exhibited a preparation cost of $80/ton and treatment cost of $0.07/g P.
- Regeneration efficiency remained above 80% after five cycles.
Conclusions:
- Developed a cost-effective PAM from ISWs for LP-SW remediation.
- The PAM shows promise for commercial production with high adsorption capacity.
- The study provides a technical basis for sustainable phosphorus removal and resource recovery.
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