SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (5): 658-664.DOI: 10.1016/j.cjche.2016.10.008

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

Influence of Na+, K+, Mg2+, Ca2+, and Fe3+ on filterability and settleability of drilling sludge

Liyan Liu, Hao Yan, Wei Tan, Guorui Zhu   

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
  • Received:2016-07-18 Revised:2016-10-09 Online:2017-07-06 Published:2017-05-28
  • Supported by:
    Supported by the National Natural Science Foundation of China (No.21376167).

Influence of Na+, K+, Mg2+, Ca2+, and Fe3+ on filterability and settleability of drilling sludge

Liyan Liu, Hao Yan, Wei Tan, Guorui Zhu   

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
  • 通讯作者: Guorui Zhu,E-mail address:zhuguorui@tju.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China (No.21376167).

Abstract: Solid-liquid separation is a vital step in drilling sludge disposal, and the filterability and settleability of drilling sludge are the main evaluating indicators for the separation process. The influence of Na+, K+, Mg2+, Ca2+, and Fe3+on drilling sludge filterability and settleability was investigated in our research. The water content, filtration rate, supernatant volume and supernatant turbidity were measured to evaluate the filterability and settleability of drilling sludge. Meanwhile, the zeta potential, specific surface area of sludge flocs, particle size distribution and Fourier-transformed infrared spectra were employed to clarify the influencing mechanism. The experimental results showed that the filterability and settleability of drilling sludge were related to concentration and types of cations. Mg2+, Ca2+, and Fe3+performed better than Na+, K+, and the cations with smaller hydrated radius got superior solid-liquid separation behavior at same valence. Finally, the spectra indicated that no chemical adsorption occurred between inorganic cations and drilling sludge flocs. The variation of surface charge and flocs growth after adding different inorganic cations were the reasons for the changes of the filterability and settleability.

Key words: Drilling sludge, Inorganic cations, Filtration, Settleability, Adsorption

摘要: Solid-liquid separation is a vital step in drilling sludge disposal, and the filterability and settleability of drilling sludge are the main evaluating indicators for the separation process. The influence of Na+, K+, Mg2+, Ca2+, and Fe3+on drilling sludge filterability and settleability was investigated in our research. The water content, filtration rate, supernatant volume and supernatant turbidity were measured to evaluate the filterability and settleability of drilling sludge. Meanwhile, the zeta potential, specific surface area of sludge flocs, particle size distribution and Fourier-transformed infrared spectra were employed to clarify the influencing mechanism. The experimental results showed that the filterability and settleability of drilling sludge were related to concentration and types of cations. Mg2+, Ca2+, and Fe3+performed better than Na+, K+, and the cations with smaller hydrated radius got superior solid-liquid separation behavior at same valence. Finally, the spectra indicated that no chemical adsorption occurred between inorganic cations and drilling sludge flocs. The variation of surface charge and flocs growth after adding different inorganic cations were the reasons for the changes of the filterability and settleability.

关键词: Drilling sludge, Inorganic cations, Filtration, Settleability, Adsorption