Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Possibilities for use of spent zeolite sorbent in cement mortars
Sorbents which often work according the ions exchanging principle are used for treatment of waste water containing heavy metal ions. There are two alternatives after spending of ions exchanging capacity: to regenerate the spent sorbent or to take away the waste materials to sanitary landfills. For the first case the expensive for sorbents regeneration are not compensated for prolongation of their reuse. For the second case taking away of spent sorbents needs large areas and in the same time there are possibilities sorbed ions to be liberate as a result of the natural process of lye emission due to atmospheric factors /rains, drying of the materials, natural water percolation in the materials, and so on. This process of lye emission of heavy metal ions will have created conditions for environmental pollution, especially for the surface and ground waters. The most often used method for leading the leachate to the local treatment plants for waste water is burdening of the treatment plant with unallowable quantity of heavy metal ions. The admissible emission norms for discharging the waste waters in surface water sources is impossible to reach but it is obligatory for Bulgarian legislation and it is under the strict control and protection of the environment administration. A possibility to use a spent sorbent type zeolite containing lead ions for constructional practice has been established. Binding substances with satisfactory strength are formed and they are suitable for different fields of constructional engineering or for cement-sand solutions where is possible to replace a part of the fine additional material /sand. The sorbed lead ions onto the spent zeolite are not extracted from investigated cement-sand solutions because of the suppressing of the process of lye emission of these ions in strong alkaline environment which is formed in the cement stone and in the water environment where these solutions contact each other. The use of spent zeolite which eliminated lead ions from industrial spent water in the constructional practice is an alternative to make it safe without second environmental pollution - superficial and underground waters and soils.
Possibilities for use of spent zeolite sorbent in cement mortars
Sorbents which often work according the ions exchanging principle are used for treatment of waste water containing heavy metal ions. There are two alternatives after spending of ions exchanging capacity: to regenerate the spent sorbent or to take away the waste materials to sanitary landfills. For the first case the expensive for sorbents regeneration are not compensated for prolongation of their reuse. For the second case taking away of spent sorbents needs large areas and in the same time there are possibilities sorbed ions to be liberate as a result of the natural process of lye emission due to atmospheric factors /rains, drying of the materials, natural water percolation in the materials, and so on. This process of lye emission of heavy metal ions will have created conditions for environmental pollution, especially for the surface and ground waters. The most often used method for leading the leachate to the local treatment plants for waste water is burdening of the treatment plant with unallowable quantity of heavy metal ions. The admissible emission norms for discharging the waste waters in surface water sources is impossible to reach but it is obligatory for Bulgarian legislation and it is under the strict control and protection of the environment administration. A possibility to use a spent sorbent type zeolite containing lead ions for constructional practice has been established. Binding substances with satisfactory strength are formed and they are suitable for different fields of constructional engineering or for cement-sand solutions where is possible to replace a part of the fine additional material /sand. The sorbed lead ions onto the spent zeolite are not extracted from investigated cement-sand solutions because of the suppressing of the process of lye emission of these ions in strong alkaline environment which is formed in the cement stone and in the water environment where these solutions contact each other. The use of spent zeolite which eliminated lead ions from industrial spent water in the constructional practice is an alternative to make it safe without second environmental pollution - superficial and underground waters and soils.
Possibilities for use of spent zeolite sorbent in cement mortars
Velkova Dimitrova, Sonia (Autor:in) / Stoykova Kostova, Irina (Autor:in) / Radenkova-Yaneva, Magdelinka (Autor:in)
Ibausil, Internationale Baustofftagung, 16 ; 1011-1017
2006
7 Seiten, 5 Bilder, 2 Tabellen, 16 Quellen
Aufsatz (Konferenz)
Englisch
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