Abstract
This study shows the ability of sodium humate from alkaline treatment sludge on removing sulfur dioxide (SO2) in the simulated flue gas. Experiments were conducted to examine the effect of various operating parameters, like the inlet SO2 concentration or temperature or O2, on the SO2 absorption efficiency and desulfurization time in a lab-scale bubbling reactor. The sludge sodium humate in the supernatant after alkaline sludge treatment shows great performance in SO2 absorption, and such efficiency can be maintained above 98% with 100 mL of this absorption solution at 298 K (flue gas rate of 0.12 m3/h). The highest SO2 absorption by 1.63 g SHA-Na is 0.946 mmol in the process, which is translated to 0.037 g SO2 g−1 SHA-Na. The experimental results indicate that the inlet SO2 concentration slightly influences the SO2 absorption efficiency and significantly influences the desulfurization time. The pH of the absorption solution should be above 3.5 in this process in order to make an effective desulfurization. The products of this process were characterized by Fourier transform infrared spectroscopy and X-ray diffraction. It can be seen that the desulfurization products mainly contain sludge humic acid sediment, which can be used as fertilizer components.
Highlights
Flue gas emissions, which mainly come from power plants by burning fossil fuels, have been causing serious air pollution for decades [1,2,3]
This paper proposed a new process for the removal of SO2 from flue gas by the absorption solution from sludge treatment and the production of fertilizer
The supernatant has a high pH value which is similar to the common commercial sodium humate
Summary
Flue gas emissions, which mainly come from power plants by burning fossil fuels, have been causing serious air pollution for decades [1,2,3]. Many researchers have been actively exploring technologies in effective flue gas desulfurization field [5,6,7,8]. Among these technologies, one of the most effective methods is the wet flue gas desulfurization which is mainly based on limestone [9]. One of the most effective methods is the wet flue gas desulfurization which is mainly based on limestone [9] It has many disadvantages, such as higher operating costs and greater water requirement and the potential to cause secondary pollution. Cost-effective technologies in removing SO2 have become the focus of investigations
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