Application of aluminum-based coagulants for improving efficiency of flue gas desulfurization wastewater treatment in coal – fired power plant

Abstract

Pollution released into the environment as the result of the combustion of energy fuels is a significant global threat. For instance, wastewater in coal–fired power plants is often heavily polluted by organic compounds, heavy metals and boron. Therefore, there is an urgent need for efficient flue gases and wastewater treatment. However, to be industrially implemented, the treatment processes have to be simultaneously effective and inexpensive. This research systematically studied the efficiency of inexpensive coagulation processes using aluminum-based coagulants applied to flue gas desulfurization (FGD) wastewater treatment. Additionally, the differences in the efficiency of total organic carbon (TOC) and chemical oxygen demand (COD) removal between sedimentation and coagulation processes were systematically studied. It was found that coagulation with the appropriate dose of PAX19XL coagulant achieved a satisfactory effect with significant boron removal and almost complete heavy metals removal. The polyelectrolyte use did not improve coagulation effectiveness and did not accelerate sludgesedimentation and volume decreasing. The detailed statistical analyses did not confirm the positive, pronounced effect of coagulation compared to sedimentation, although there were observed exceptions that should be considered separately. The results obtained suggest that inexpensive aluminum-based coagulants may be effective in improving the efficiency of flue gas desulfurization wastewater treatment in coal–fired power plants.

Alternative Approach to Current EU BAT Recommendation for Coal-Fired Power Plant Flue Gas Desulfurization Wastewater Treatment

“…A small change in the dose results in a significant deterioration in the boron removal rate. The results obtained in this study can be compared with the results obtained by Marcinowski et al [35]. FGD wastewater was subjected to Al-based coagulation treatment, and obtained boron removal was up to 75.3%.…”

Efficient removal of dyes in textile effluents using aluminum-based coagulant

“…Excessive use of chemical dose resulted in surging the level of COD, since T4 showed dropping of percentage of COD removal (Hua et al, 2019). The study of Piotr Marcinowski et al, proclaimed that inorganic coagulants such as aluminum chloride and alum have been significantly suitable for decreasing the level of COD in wastewater (Marcinowski et al, 2019). The ANOVA analysis of COD with different doses were significant as presented in Table 4.…”