ORIGINAL RESEARCH
Attenuation of Phosphate and Fluoride from Phosphogypsum Leachate by Rice Husk Biochar
Xin Peng 1,2,3
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1
Shandong Provincial Geo-mineral Engineering Exploration Institute, Shandong Provincial Bureau of Geology & Mineral Resources, Shandong Engineering Research Center for Environmental Protection and Remediation on Groundwater, Jinan 250014, P. R. China
 
2
Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization Technology, Chengdu University, Chengdu 610106, P. R. China
 
3
School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, P. R. China
 
4
College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, P. R. China
 
5
Central & Southern China Municipal Engineering Design and Research Institute Co., Ltd, WuHan 430010, P. R. China
 
 
Submission date: 2024-07-11
 
 
Final revision date: 2024-08-29
 
 
Acceptance date: 2024-10-28
 
 
Online publication date: 2025-01-29
 
 
Publication date: 2025-11-14
 
 
Corresponding author
Yunfeng Zhang   

Shandong Provincial Geo-mineral Engineering Exploration Institute, Shandong Provincial Bureau of Geology & Mineral Resources, Shandong Engineering Research Center for Environmental Protection and Remediation on Groundwater, Jinan 250014, P. R. China
 
 
Pol. J. Environ. Stud. 2025;34(6):8189-8200
 
KEYWORDS
TOPICS
ABSTRACT
The massive accumulation of phosphogypsum (PG) in the open air can produce a large quantity of phosphorus- (P) and fluoride- (F) rich acidic solution, which is environmentally and ecologically dangerous. However, very few studies have focused on this serious issue. In this regard, batch experiments were conducted to test the adsorption characteristics and capacity of rice husk biochar (RHB) pyrolyzed at 600 °C for P and F from real PG leachate. The results indicated good adsorption capacity (3838 mg-P/kg and 2500 mg-F/kg), which was mainly controlled by electrostatic attraction and precipitation mechanisms. The column-packed RHB at a dosage of 93 g and an influent flow rate of 0.5 ml/min was the best for the P and F removal from real PG leachate. Various breakthrough curve models were used to simulate the experimental data, and the model fitting results revealed that all models except the Adams-Bohart model well simulated the dynamic adsorption behaviors of P and F. The BDST model results show that RHB can be a low-cost, safe, reliable adsorbent in real-world applications to remove P and F from PG leachate.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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