# Experimental Study on the Desalination of Waste Leachate Using the Combined Freezing Method
## 3 Results and Discussion
### The Desalination Effect of Different Desalination Methods on Waste Leachate
#### 3.2.3 Research on the Desalination Effect of the FBM on Waste Leachate  
The FBM as a potential desalination method is based on the research of [PERSON] et al. (2016) on desalination in saline canals. Therefore, we consider whether the FGBM can improve the desalination effect. The basis for this idea is mainly the following two factors: the formation of brine channels under gravity and the kinetic properties of the blowing wind so that the salt molecules produce displacement, vibration, or deformation and accelerate the separation from the ice. The blowing wind can accelerate the melting of the ice, and meltwater can be used as a detergent to clean the brine channels to achieve purification of the ice. Thus, a study of desalination after 100 min of gravity combined with different blowing times was initiated. Figure 9 shows the desalination parameters of waste leachate after 100 min of gravity combined with blowing. With the increase in blowing time, the salt rejection gradually increased from 41.52% at the beginning to 65.85%, and the ice production rate decreased from 70.53% to 49.72%. The salinity of the ice meltwater decreased from 3.24% to 1.39%. When the blowing time was 5 min, the salt rejection was 41.52%. When the blowing time was 10 min, the salt rejection increased to 57.49% when the salinity of the ice meltwater was 1.72%. When blowing for 15 min, the salt rejection was 63.88%, and the ice production rate was 53.61%. When the blowing action was 20 min, the salt rejection was 65.85%. Under the effects of the FGBM, the salt rejection increased continuously. Although the overall trend in salt rejection increased, the change in salt rejection from 15 to 20 min was not significant, and the salinity only decreased by 0.08%. There were two reasons for the analysis: one was that the brine channel formed at gravity 100 min was small and narrow, and the second was that the ice body was too thick, and the blowing effect could not penetrate the whole ice layer. The phenomenon observed \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Process Parameter** & **Mean Square** & **F-Value** & \(p\)**-Value** \\ \hline Centrifugal time & 11.172 & 45.292 & 0.007 \\ Centrifugal speed & 608.712 & 16.747 & 0.026 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: ANOVA for the salt percent removal and process parameters. Figure 8: The relationship between salt rejection and centrifugal time, (**a**) and the relationship between salt rejection and centrifugal speed (**b**). in the experiment was that the color of the surface ice body tended to become transparent with the continuous action of the blowing wind, which indicated that, under the action of the blowing wind, the salts in the surface layer of the ice body accelerated to sink inside of the ice body under the combined actions of gravity and blowing wind, which had a good removal effect on the surface salt and organic matter. A comparative analysis showed that the FGBM was limited by two main factors, namely the large thickness of the block ice and the easy melting of the ventilated surface layer, which did not result in an advantage in the overall salt rejection of the FGBM. Therefore, the formed ice block should first be crushed before being blown. Figure 10 shows the effects of different blowing times on the salt rejection of waste leachate after crushed ice treatment. From the figure, it can be seen that the salt rejection of the FCBM changes more obviously with the increase in blowing time. When the blowing time is 1 min, the salinity of the ice meltwater is 1.24%, the salt rejection is 69.53%, and the ice production rate is 56.15%. At this time, it was observed that the broken ice in the center of the funnel was slightly yellowish brown, and the surrounding ice crystals gradually changed from yellowish brown to transparent. This phenomenon is mainly caused by the cleaning effect of meltwater on the ice crystals in the upper layer and their accumulation in the lower layer.