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FP5

WASTILE Sintesi della relazione

Project ID: G1RD-CT-2001-00468
Finanziato nell'ambito di: FP5-GROWTH
Paese: Poland

Analysis of feed, by-products and final products

Various feed materials were analysed: medical ash, ash from the Belchatow power plant, post-chromium sludge and the municipal wastewater sludge. From these materials plasma treated vitrificates have been made. The investigated materials were characterised and tested for moisture content, pH and mass decrement. Leaching tests were also made for feed materials and vitrificates. The obtained results were compared with the EU Directive pr EN 12457-3, which includes specific standard requirements for hazardous wastes.

The analysis of the moisture content of materials showed the largest level of water adsorbed in the municipal wastewater sludge (78,04%). The Belchatow power plant ash contained only 7,90% of water. The pH of the Belchatow power plant ash and the post-chromium sludge was around 10. Only pH of the municipal waste water sludge was acidic. The feed materials were also tested for mass decrement. The medical ash had the highest mass decrement (9,3%) and the municipal wastewater sludge had the lowest decrement.

Leachability tests were also made for feed materials. The results of the leachability tests showed that the medical ash is the most dangerous because the leachibility of heavy metal (Crtotal, Zn, Cd) exceeded the required concentrations.

All the feed materials were vitrified. The vitrificates were analysed and put to the tests on leachability. According to the requirements of the European Standards the vitrificates can be recognised as inert wastes for the transient period (16 July 2002 to 16 July 2005). Almost all the heavy metal concentrations had not exceed the required concentrations for those metals except Pb where the required concentration after the transient (regulations) period would be 0,3mg/kg. Only the vitrificates from medical ash can be recognised as inert wastes after the transient period - the leaching tests showed that those types of vitrificates are safe.

Leachability of metals was also checked for final products i.e. foam glass (from UMM) and tiles (from GLASS). The leachability of metals from these products was within standard requirements with the only exception of tiles that had been coloured red. There the content of Cd was above standard requirement (0,148 [mg/kg] compared to standard value 0,03[mg/kg]).

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Krystyna CEDZYNSKA, (Professor)
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