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.
Highlights
Most of the world’s energy is produced as the result of coal and petroleum combustion
The use of a coagulation using aluminium coagulants and the use of flocculants allows to achieve a satisfactory effect of flue gas desulfurisation (FGD) wastewater treatment, especially in case of heavy metal removal, up to complete removal of Pb, Cu, V, Cr and Fe
The use of polyelectrolyte did not increase the efficiency of chemical oxygen demand (COD) and total organic carbon (TOC), in the removal of heavy metal content in treated wastewater, as well as ion content
Summary
Most of the world’s energy is produced as the result of coal and petroleum combustion. Most common wastewater treatment method used is based on the double coagulation with iron salts, initially at pH 6.0 and 8.5, and complexation of metals using TMT-15 (15% aqueous solution of organic sulfide, trisodium 1,3,5-triazine-2,4,6-trithiolate). This technology is partially consistent with the Council Directive [6], Regulation of the Minister of the Environment [7], Regulation of the Minister of the Environment [8] and integrated and water permits obtained by the system power plant. We examined the credibility of total organic carbon (TOC) determination in a high salinity matrix using two TOC analyzers, whose operation methods differ significantly between each other as part of this work,
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
