Method for optimizing struvite production parameters based on response surface method and Minteq combined regulation

By combining response surface methodology and Minteq, the production parameters of struvite were optimized, solving the problem of excessive heavy metals, achieving efficient phosphorus recovery and safe fertilizer production, and reducing costs.

CN121765684APending Publication Date: 2026-03-31CHINA THREE GORGES UNIV
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Patent Information

Application Number
CN202511936887.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-19
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively regulate the occurrence of heavy metals and the recovery rate of phosphorus in struvite, resulting in excessive heavy metals that limit its safe application as a fertilizer. Furthermore, the interaction of various factors has not been fully analyzed.

Method used

By combining response surface methodology and Minteq, experimental designs were implemented to optimize struvite production parameters, including pH, heavy metal concentration, heavy metal molar ratio, and bicarbonate concentration. A regression model was then established to optimize phosphorus recovery and heavy metal content.

Benefits of technology

It enables the control of heavy metal concentration and alkalinity in wastewater to maximize phosphorus recovery, minimize the occurrence of heavy metals in struvite, provide safe and healthy agricultural soil fertilization process parameters, reduce sodium hydroxide usage, and improve production efficiency.

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Abstract

The invention relates to a method for optimizing struvite production parameters based on response surface method and Minteq combined regulation and control, and belongs to the technical field of parameter optimization. The invention discloses a method for optimizing struvite production parameters based on response surface method and Minteq combined regulation and control. The method has the following advantages: (1) the pH can be regulated and controlled according to the concentration of heavy metals in wastewater, the concentration of bicarbonate maximizes the recovery rate of phosphorus, the occurrence of heavy metals in struvite products is minimized, and the yield of the struvite products is improved; optimal process parameters are provided for safe and healthy application of agricultural soil fertilization; (2) the adopted response surface method has the characteristics of simple operation, high feasibility and accurate prediction; (3) regulation and control can be performed according to the concentration and alkalinity of heavy metals contained in phosphorus-containing wastewater of pig manure wastewater, and high-quality phosphorus recovery of different types of wastewater is realized; and (4) parameter regulation and control can be carried out according to the measured wastewater with phosphorus recovery value, the dosage of sodium hydroxide is saved, and the cost is greatly saved.
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