Abstract
According to the characteristics of desulfurization wastewater, A new capacitive deionization (CDI) device was designed to study the desalination characteristics of desulfurization wastewater in this paper. The experiments investigated the desalination efficiency under different conditions which find that the best desalination efficiency is achieved at a voltage of 1.2V, pH=11 and 50°C. Besides, ion adsorption is more favorable under acidic and alkaline conditions. The anion and cation removal performance experiments showed that the order of cation removal is Mg2+>Na+>Ca2+>K+ and the order of anion removal is Cl->CO32->NO3->SO42->HCO3-. The mechanism of CDI was studied and analyzed by the isothermal adsorption model and COMSOL simulation software. It was found that the Freundlich model and Redlich-Peterson model have a good fit with the experimental results. The experiments show that the CDI device has excellent stability. CDI device was used to treat actual desulfurization wastewater. Furthermore, the study provides theoretical support for the industrial application of CDI for desulfurization wastewater treatment in the future.
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Abbreviations
- Q 0 :
-
Constant in Langmuir model (mg/g)
- b :
-
Constant in Langmuir model (L/mg)
- C e :
-
Concentration of adsorbate in solution at equilibrium (mg/L)
- q e :
-
Electrical adsorption capacity at equilibrium (mg/g)
- q t :
-
Electrical adsorption capacity at t (mg/g)
- K F :
-
Constant in Freundlich model (mg/g)/(mg/L)1/n
- n :
-
Constant in Freundlich model
- K RP :
-
Constant in Redlich Peterson model (L/g)
- a RP :
-
Constant in Redlich Peterson model (L/mg)
- Β :
-
Constant in Redlich Peterson model
- V :
-
Volume of solution (L)
- v :
-
Scan rate (mV/s)
- V c :
-
High voltage for CV
- V a :
-
Low voltage for CV
- K 1 :
-
Constant in pseudo-first-order model (g/min)
- K 2 :
-
Constant in pseudo-second-order model (g/mg*min)
- Q e,i exp :
-
Experimental value of Qe
- Q e,i cal :
-
Predicted value of Qe
- N :
-
Number of observations in the experimental isotherm
- I :
-
Electric current density
- P :
-
Number of parameter in regression model
- t :
-
Time (min)
- C 0 :
-
The initial concentration of the solution
- C t :
-
The concentration of the solution at T
- C :
-
Specific capacitance
- m :
-
The quality of the adsorbent material (g)
- MPSD:
-
Marquardt’s percent standard deviation
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This work was supported by the financial support of National Key R&D Program of China (2018YFB0604305-01).
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Shuangcheng Ma, Chang Liu, and Lan Ma wrote the main manuscript text; Yongyi Xu and Feng Wang participated in the design of the experiment; Yu Tan modified this article; and Dingchang Yang translated the language of the article.
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Liu, C., Ma, L., Xu, Y. et al. Experimental and theoretical study of a new CDI device for the treatment of desulfurization wastewater. Environ Sci Pollut Res 29, 518–530 (2022). https://doi.org/10.1007/s11356-021-15651-2
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DOI: https://doi.org/10.1007/s11356-021-15651-2