磷石膏堆场渗滤液的分级结晶与磷回收研究

陈宇琦; 邵登科; 韩飞扬; 刘小宁

doi:10.13205/j.hjgc.202404014

磷石膏堆场渗滤液的分级结晶与磷回收研究

doi: 10.13205/j.hjgc.202404014

武汉大学水利水电学院,武汉 430072

基金项目:

湖北省自然科学基金面上项目(JCZRYB202400671)

详细信息

作者简介:
陈宇琦(2003-),女,主要研究方向为污水处理与水资源利用。2473590985@qq.com

通讯作者:
刘小宁,男,副教授,主要研究方向为污水处理与资源化利用。liuxiaoning@whu.edu.cn

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- 文章访问数: 86
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- 被引次数: 0
出版历程
- 收稿日期: 2023-05-05
- 网络出版日期: 2024-06-01

GRADED CRYSTALLIZATION AND PHOSPHORUS RECOVERY BY FORM OF STRUVITE FROM PHOSPHOGYPSUM LEACHATE

School of Water Resources and Hydropower Engineering, Wuhan University,Wuhan 430072, China

摘要

摘要: 考虑磷资源的不可再生性和不可或缺性,基于鸟粪石结晶法处理和回收磷石膏渗滤液中的磷具有重要的环境和经济意义。系统研究了湖北省某肥料厂磷石膏堆场渗滤液废水中高效回收磷的可行性和结晶参数优化。结果显示:改变单次磷回收结晶条件[pH、n(Mg)/n(P)和n(N)/n(P)],渗滤液中磷回收率最大值仅为67.8%。响应曲面设计实验进一步证实,参数因子增加到一定程度后,磷回收率随着pH、n(Mg)/n(P)和n(N)/n(P)的增加没有显著变化。综合考虑各因素对废水回收磷的影响,确定在磷石膏渗滤液中磷回收的最优条件参数为pH=8.6,n(Mg)/n(P)=1.6,n(N)/n(P)=1。采用分级结晶的方法,经过3次结晶,磷回收率达到97.9%。结合仪器表征和Minteq模型分析结果,磷回收阶段主要产物为鸟粪石以及少量的磷酸钙,且鸟粪石中重金属含量极低。
- 磷石膏渗滤液 /
- 鸟粪石 /
- 响应曲面法 /
- 磷回收 /
- 分级结晶
Abstract: Considering the non-renewable and indispensable nature of phosphorus resources, the treatment and recovery of phosphorus from phosphogypsum leachate based on the crystallization method of bird droppings has important environmental and economic significance. This paper systematically studied the feasibility of recovering phosphorus in the phosphogypsum leachate from a fertilizer company in Hubei Province and the crystallization optimization. The results showed that the main reaction parameters posed a limited effect on obtaining a higher phosphorus recovery efficiency in a single reaction process, and the maximum phosphorus recovery efficiency was only 67.8%. The latter response surface design experimental results also confirmed that after a certain stage, the increase in pH, n(Mg)/n(P), and n(N)/n(P) did not significantly enhance the phosphorus recovery efficiency. Considering the influence of various factors on phosphorus recovery, the optimal condition parameters were determined as follows: pH=8.6, n(Mg)/n(P)=1.6, n(N)/n(P)=1. Finally, a graded crystallization method was adopted, and after three crystallization cycles, phosphorus recovery efficiency reached 97.9%. After characterizing the products in the phosphorus recovery stage through EPMA, XRD and Minteq modeling analysis, the products were mainly struvite with a small amount of calcium phosphate, and the heavy metal content in struvite was extremely low, ensuring its subsequent application safely in agricultural as a potential fertilizer.
- phosphogypsum leachate /
- struvite /
- response surface methodology /
- phosphorus recovery /
- graded crystallization

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参考文献(21)

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