CaP结晶同步回收污水厂厌氧消化液中的磷和富里酸

张爽; 邓治华; 李祎楠; 王正博; 聂小保

doi:10.13205/j.hjgc.202512007

CaP结晶同步回收污水厂厌氧消化液中的磷和富里酸

doi: 10.13205/j.hjgc.202512007

1. 中国电建集团西北勘测设计研究院有限公司, 西安 710065;
2. 湖南省郴州水文水资源勘测中心, 湖南郴州 424108;
3. 长沙理工大学水利与环境工程学院, 长沙 410114

基金项目:

湖南创新型省份建设郴州国家可持续发展议程创新示范区专项（2021sfq15）；湖南省环保科研项目（HBKT-2022001）；湖南省水利科技项目（XSKJ2022068-40）

详细信息

作者简介:
张爽（1984—），男，硕士研究生，高级工程师，主要从事市政给排水工艺研究及设计工作。407475923@qq.com

通讯作者:
张爽（1984—），男，硕士研究生，高级工程师，主要从事市政给排水工艺研究及设计工作。407475923@qq.com

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出版历程
- 收稿日期: 2023-09-27
- 录用日期: 2023-12-10
- 修回日期: 2023-11-09
- 网络出版日期: 2026-01-09

Simultaneous recovery of phosphorus and fulvic acid from anaerobic digestate of sewage treatment plants with calcium phosphate （CaP） crystallization

1. Power China Northwest Engineering Corporation Limited, Xi'an 710065, China;
2. Hunan Chenzhou Hydrology and Water Resources Survey Center, Chenzhou 424108, China;
3. School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China

摘要

摘要: 厌氧消化液中腐殖质会降低磷酸钙（CaP）结晶磷回收效果，但可提高结晶产物作为磷肥时的植物有效性。为解决腐殖质对CaP结晶的抑制，以流化床为反应器，通过提高n（Ca）/n（P）和增加搅拌，实现同步高效回收磷和腐殖质。结果表明，初始磷和富里酸（FA）浓度分别为30，25 mg/L，搅拌转速为100 r/min，n（Ca）/n（P）为5时，磷和FA的最大回收率分别为73%和53%。FA通过氢键和羧基表面络合迟滞CaP结晶，加强搅拌可促进CaP成核和晶核团聚，提高磷回收率；FA的回收由CaP共结晶和吸附作用共同实现，Ca²⁺桥联液相FA和表面吸附FA，将进一步提高FA回收率。pH值在7~10范围内，磷回收率随pH值的增加而增加，FA回收率随pH值的增加呈现先增加后降低趋势，最大去除率出现在pH=9时，为53%。FA存在情况下，CaP结晶产物包括羟基磷灰石（HAP）及其前体物。
- 磷回收 /
- 腐殖质 /
- CaP结晶 /
- Ca/P摩尔比 /
- 搅拌
Abstract: Despite the presence of humic substances in the digestate of sewage treatment plants deteriorates the phosphorus （P） recovery efficiency of calcium phosphate （CaP） crystallization， it dose improve the phytoavailability of CaP when used as P fertilizer. To overcome the inhibitory effect of humic substances on CaP crystallization， phosphorus and humic substances were co-recovered efficiently using a fluidized-bed reactor through optimization of Ca/P molar ratio and stirring intensity. The results showed that recovery efficiencies of 73% for P， and 53% for fulvic acid （FA）， were achieved at an initial P concentration of 30 mg/L， an FA concentration of 25 mg/L， a stirring speed of 100 r/min， and a Ca/P molar ratio of 5. FA was proved to delay the crystallization process of CaP via hydrogen bonding and carboxyl surface complexation. Stirring promoted the nucleation of CaP and facilitated the aggregation of nuclei， thereby enhancing P recovery efficiency. Meanwhile， high FA recovery efficiency was obtained by the co-precipitation of FA and CaP and FA adsorption on the CaP surface. FA recovery efficiency can be further enhanced through Ca²⁺ bridging between FA in the liquid phase and FA adsorbed on the CaP surface. Within the tested pH range of 7 to 10， P recovery efficiency increased with the increasing of pH value， while FA recovery efficiency initially increased and then decreased， peaking at 53% at pH 9. In this case， CaP crystallization products contain hydroxyapatite （HAP） and its precursors.
- phosphorus recovery /
- humic substances /
- CaP crystallization /
- Ca/P molar ratio /
- stirring

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