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. Graphical abstract.
Highlights
At present, wet limestone-gypsum flue gas desulfurization (FGD) is widely used in most coal-fired power plants and is a mature technology with high efficiency of desulfurization (Shuangchen et al 2016)
There is not enough space to set up desulfurization wastewater treatment device in the tail section of many power plants and the small space occupied by Capacitive deionization (CDI) can effectively solve such problems
The specific capacitance of the adsorbed material was estimated by using cyclic voltammetry (CV) which can be determined for voltages ranging from -0.6 to 1.2 V by the following equation (Liu et al 2019):
Summary
Wet limestone-gypsum flue gas desulfurization (FGD) is widely used in most coal-fired power plants and is a mature technology with high efficiency of desulfurization (Shuangchen et al 2016). Traditional treatment methods for desulfurization wastewater include chemical precipitation (Fu and Wang 2011), biological treatment technology (Huang et al 2017), electrodialysis (Cui et al 2017), and thermal (Luo et al 2019; Conidi et al 2018; Jia and Wang 2018; Lee et al 2018) and membrane(Iaquaniello et al 2014; Gingerich et al 2018; Hassan and Darwish 2014)methods These methods have many problems, such as high cost, high pre-treatment requirements, easy to scale and clogging. There is not enough space to set up desulfurization wastewater treatment device in the tail section of many power plants and the small space occupied by CDI can effectively solve such problems. The stability of desalination of the device was verified experimentally which provides basic data for the application of CDI in the treatment of desulfurization wastewater
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