欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2020, Vol. 20 ›› Issue (10): 1166-1173.DOI: 10.12034/j.issn.1009-606X.219353

• 反应与分离 • 上一篇    下一篇

磁性助凝剂资源化制备及强化污染物沉淀分离

孟晓飞1,2,3， 侯 蓉1,4， 赵 赫1* ， 许 斌5， 杨林浩5   

  1. 1. 中国科学院绿色过程制造创新研究院，北京 100190 2. 中国科学院地理科学与资源研究所，北京 100101 3. 中国矿业大学(北京)化学与环境工程学院，北京 100083 4. 湖南省攸县第二中学，湖南 株洲 412309 5. 邯郸钢铁集团责任有限公司，河北 邯郸 056001
  • 收稿日期:2019-11-28 修回日期:2020-01-19 出版日期:2020-10-22 发布日期:2020-10-16
  • 通讯作者: 赵赫 hzhao@ipe.ac.cn
  • 基金资助:
    水体污染控制与治理科技重大专项;中国科学院青年创新促进会

Preparation of magnetic coagulant aid from wastes for enhanced pollutant precipitation

Xiaofei MENG1,2,3, Rong HOU1,4, He ZHAO1*, Bin XU5, Linhao YANG5   

  1. 1. Innovation Academy for Green Manufacturing, Chinese Academy of Sciences, Beijing 100190, China 2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China 3. School of Chemical & Environment Engineering, China University of Mining & Technology Beijing, Beijing 100083, China 4. Youxian Second Middle School in Hunan Province, Zhuzhou, Hunan 412309, China 5. Handan Iron and Steel Group Co. LTD., Handan, Hebei 056001, China
  • Received:2019-11-28 Revised:2020-01-19 Online:2020-10-22 Published:2020-10-16
  • Supported by:
    Major Science and Technology Program for Water Pollution Control and Treatment;Youth Innovation Promotion Association

PDF

摘要： 通过高温碳化处理，研发并优化磁性助凝剂的资源化制备，并回用于混凝过程强化污染物的沉淀分离。采用磁化曲线、扫描电镜等表征手段，对不同高温制备得到的磁性助剂进行结构及形貌的表征。进一步对混凝过程中絮体的粒度粒型分析得知，磁性助剂有利于污染物的沉淀分离，加入700℃碳化后的磁性助剂(PFS:RW700=1:1.43)使污染物的沉淀分离效率提高至99.45%。磁性助剂带有的磁性使助剂易被絮体包裹，从而加速沉降；磁性助剂中含大量的碳且表面带有羧基等官能团，具有一定的吸附能力；经高温碳化结晶度增加且颗粒大小均一，有利于成核加快絮体增长。通过优化磁性助剂与聚合硫酸铁(PFS)的投加比，仍保持较高的污染物去除率，与活性炭相比，水处理成本降低了2 RMB/t，为解决混凝污泥资源化途径提供技术支撑。

关键词: 剩余污泥, 资源化, 强化混凝, 铁氰

Abstract: In recent years, with the increasing of water treatment, the production of coagulated sludge has a sharp rise. So, the realization of coagulated sludge resource utilization is necessary. In this research, the coagulated sludge treated by carbonization at high temperature and polymerized ferrous sulfate (PFS) were added together to remove Fe(CN)63? pollutants. And the mechanism of coagulation was further studied. The structure of the coagulated sludge materials was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and magnetic hysteresis curve. The pollutant of Fe(CN)63? coagulated by PFS and coagulated sludge was analyzed by the removal rate, particle size and shape. The results showed that the sludge materials contained a large amount of carbon and it had some functional groups like carboxyl on the surface. Iron and vanadium oxides which had complexation ability were formed on the surface carbonized sludge materials. The crystallinity and grain size of the coagulated sludge were more ordered and more uniform by carbonization at high temperature which could benefit to the growth of flocs in the process of coagulation. The removal of Fe(CN)63? increased by adding coagulated sludge. Especially, the removal of Fe(CN)63? increased to 99.45% by adding the sludge which was carbonized at 700℃ with PFS:RW700=1:1.43. By the analysis of particle size and shape, the coagulated sludge was beneficial to the enhancement of pollutants during coagulation process. By optimizing the ratio of sludge material to PFS, the removal of Fe(CN)63? pollutant was also close to 100% by reducing the dosage of PFS. Compared with the other coagulants, the cost of water treatment decreased. This study provided theoretical and technical basis for the resource recycling of coagulated sludge. This new type of sludge resource utilization had promising application in the field of cyanide removal.

Key words: surplus sludge, resource utilization, enhanced coagulation, Ferrocyanide