Treatment of Wastewater from Flue Gas Cleaning

Abstract

Wet scrubber systems for flue gas treatment, giving rise to a production of wastewater contaminated with heavy metals, are used at many coal-fired power stations in Europe, the USA and Japan. In order to remove the heavy metals from the wastewater, chemical precipitation with hydroxide and sulphide is applied. Results from two full-scale plants are given. Due to strict regulations for landfilling of waste contaminated with heavy metals, the amount of sludge must be minimised. Different techniques to meet this requirement are described. Biological post-treatment to reduce the nitrogen content of the wastewater will apparently be a need in the future, and pilot-scale testing is presently being carried out to determine the basic operation rules for a full-scale plant.

Solid-State Reduced Sulfur Compounds: Environmental Aspects and Bio-Remediation

“…In large-scale industrial combustion, electrostatic precipitators can be applied to remove (partially) the particles in combination with scrubbers to remove gaseous sulfur dioxide (Brimblecombe et al, 1989;Vendrup and Sund, 1994). However, the removal efficiency of such devices is never complete.…”

Rational design of selective functionalized silica adsorbents for Hg(ii) removal from FGD wastewater. A combined experimental and theoretical study

“…[2][3][4] The combustion of coal for electric power generation requires Flue Gas Desulfurization (FGD) treatment to remove SO x that results in substantial production of wastewater containing Hg 2+ cations. 3 Many wastewater treatment technologies have been proposed to remove heavy metals, such as Hg 2+ , including chemical precipitation, [5][6][7] membrane filtration, 8,9 ion-exchange, [10][11][12] and adsorption. [13][14][15][16] Adsorption is one of the most promising technologies for wastewater treatment due to its high efficiency and selectivity.…”

Kinetics of Manganese Uptake by Wetland Plants

“…Various remediation methods exist for heavy metal contaminated wastewaters. These methods involve chemical approaches such as alkaline precipitation, sulphide precipitation, addition of oxidizing agents and coagulation/flocculation in combination with physical sedimentation and/or filtration processes to remove the metal precipitates from the wastewater [2][3][4] . Physical mechanisms that directly remove dissolved heavy metals from wastewaters include ion exchange [5,6] , liquid-liquid extraction [7,8] , electrolysis [9,10] and adsorption [11,12] .…”

“…4 •H 2 O was dissolved in distilled water to achieve Concentrations of manganese (mg L −1 ) in the water…”