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

doi:10.1016/j.cjche.2016.10.008

摘要/Abstract

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

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

Liyan Liu, Hao Yan, Wei Tan, Guorui Zhu. Influence of Na⁺, K⁺, Mg²⁺, Ca²⁺, and Fe³⁺ on filterability and settleability of drilling sludge[J]. , 2017, 25(5): 658-664.

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

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

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