NATO/CCMS Pilot Study Evaluation of Demonstrated and ... - CLU-IN

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NATO/CCMS Pilot Project on Contaminated Land and Groundwater (Phase III) January 2001 Figure 7 15
NATO/CCMS Pilot Project on Contaminated Land and Groundwater (Phase III) January 2001 Project No. 2 Location Spolchemie a.s., Ústí nad Labem, Czech Republic Technical Contact Marek Stanzel KAP, Ltd. Trojská 92 171 00 Prague 7 Czech Republic www.kap.cz Tel: (00-420-2) 83 09 06 14 Fax: (00-420-2) 83 09 06 58 E-mail: m.stanzel@prg.kap.cz 1. INTRODUCTION Pilot Test on Decontamination of Mercury-Polluted Soil Project Status Final report Project Dates Accepted 1999 Final Report 2000 Costs Documented? Yes 16 Contaminants Metallic mercury Media Soil Project Size Pilot test - 1 m 3 (2 tons) Technology Type Wet gravity separation Results Available? No The pilot test on decontamination of mercury-polluted soil consisting of excavation of mercury-polluted soil and on-site wet gravity separation was conducted at the area of Spolchemie located in the center of the city Ústí nad Labem in northwest Bohemia. The pilot test was conducted with the aim to demonstrate the recovery efficiency and possibility to fulfill the objective limit for decontamination, i.e.,70 ppm of Hg in treated soil. 2. BACKGROUND In 1998, the investigation of pollution and risk assessment was finished in the area of Spolchemie, a large chemical plant located in the center of Ústí nad Labem in northwest Bohemia. High-grade elemental Hg pollution of soil was found in areas adjacent to former and current buildings of the mercury-cell process for producing caustic soda, caustic potash, hydrogen, and chlorine. Maximum concentrations of mercury often reach up to hundreds of thousands ppm. Total calculated amount of metallic Hg is 267-445 tons in 222.740 m 3 of polluted soil. The mercury is present in the form of visible drops or softly dispersed in the soil. The scale and character of the pollution was presented in detail in previous papers. A scale of the cleanup project has not been decided yet, but it looks very probable that the main volume of polluted soil will be excavated and decontaminated and the lower level of pollution will be monitored only. The feasibility study evaluating decontamination methods used worldwide was performed. Because of a lack experience in decontamination of mercury-polluted soils in the Czech Republic, a project was conducted in 1998 for identification and laboratory tests for decontamination. The project aimed to select the most suitable method for decontamination of soils with massive pollution by mercury. For a large quantity of contaminated material the thermal method (used worldwide) is not considered suitable for our case because of high-energy costs. Regarding the laboratory tests, the experts of KAP decided to solve this problem by means of wet gravity separation, taking advantage of mercury’s specific physical and chemical properties. On the basis of laboratory tests, the Pilot Test Project for Decontamination of Mercury-Polluted Soil was elaborated and accepted in 1999.
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Table 1: Nitrate Content in Ground
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NATO/CCMS Pilot Study Evaluation of Demonstrated and ... - CLU-IN

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