王少康^1,2,,
程方^1,2,,
郭兴芳³,
申世峰³
1.天津城建大学环境与市政工程学院，天津 300384
2.天津城建大学水质科学与技术天津市重点实验室，天津 300384
3.中国市政工程华北设计研究总院有限公司，天津 300074

Mechanism analysis of magnetic powder function in deep phosphorus removal by magnetic coagulation

WANG Shaokang^1,2,,
CHENG Fang^1,2,,
GUO Xingfang³,
SHEN Shifeng³
1.School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
2.Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Tianjin 300384, China
3.North China Municipal Engineering Design and Research Institute Co.Ltd., Tianjin 300074, China

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摘要:为适应天津新地(DB 12/599-2015)对出水总磷的排放需求，对天津某污水处理厂二沉池出水进行磁加载混凝工艺深度除磷实验。探讨了3种磁粉在粒径、表面电荷和磁感应强度等方面对混凝的影响；对比了磁加载混凝和常规混凝在沉降时间、絮体生长动力学的差异；分析了磁加载混凝和常规混凝对于不同形态磷的去除效果。结果表明，在磁加载混凝技术深度除磷中，磁粉的粒径、电性和磁性的协同作用是提高混凝效果的主要因素，粒径范围适中，表面带正电荷，磁感应强度越大越有利于污染物的去除。磁加载混凝技术可减少混凝剂用量、缩短沉降时间、提升去除效果，磁粉在混凝过程中起电性中和、表面吸附、絮凝成核、快速沉降的作用。
关键词: 污水处理/
深度除磷/
磁加载混凝/
表面电荷/
磁感应强度

Abstract:In order to meet the total phosphorus discharge demand by the new local standard (DB 12/599-2015) of Tianjin，the magnetic coagulation experiments were conducted to study the deep phosphorus removal from secondary effluent of a local sewage plant. Three kinds of magnetic powders were taken to study the effects of their particle size distribution, surface charge and magnetic induction intensity on coagulation. Then the differences in settling time, floc growth kinetics and removal performance on different phosphorus forms between magnetic coagulation and conventional coagulation were compared. Results show that the synergistic effect of particle size, electrical properties and magnetism of magnetic powder was the main factor to improve phosphorus removal effect of magnetic coagulation, and moderate particle size, positive surface charge and strong magnetic induction intensity were conducive to phosphorus removal. Magnetic coagulation technology can reduce coagulant dosage, shorten settling time and improve removal effect, and magnetic powder plays the roles of charge neutralization, surface adsorption, flocculation and nucleation, rapid sedimentation during the coagulation process.
Key words:sewage treatment/
deep phosphorus removal/
magnetic coagulation/
surface charge/
magnetic induction intensity.

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磁粉在磁加载混凝深度除磷中的作用机理分析

王少康^1,2,,
程方^1,2,,
郭兴芳³,
申世峰³
1.天津城建大学环境与市政工程学院，天津 300384
2.天津城建大学水质科学与技术天津市重点实验室，天津 300384
3.中国市政工程华北设计研究总院有限公司，天津 300074
基金项目:
关键词: 污水处理/
深度除磷/
磁加载混凝/
表面电荷/
磁感应强度
摘要:为适应天津新地(DB 12/599-2015)对出水总磷的排放需求，对天津某污水处理厂二沉池出水进行磁加载混凝工艺深度除磷实验。探讨了3种磁粉在粒径、表面电荷和磁感应强度等方面对混凝的影响；对比了磁加载混凝和常规混凝在沉降时间、絮体生长动力学的差异；分析了磁加载混凝和常规混凝对于不同形态磷的去除效果。结果表明，在磁加载混凝技术深度除磷中，磁粉的粒径、电性和磁性的协同作用是提高混凝效果的主要因素，粒径范围适中，表面带正电荷，磁感应强度越大越有利于污染物的去除。磁加载混凝技术可减少混凝剂用量、缩短沉降时间、提升去除效果，磁粉在混凝过程中起电性中和、表面吸附、絮凝成核、快速沉降的作用。

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