| Autor: |
Stegenta, Sylwia, Kałdun, Barbara, Sobieraj, Karolina, Białowiec, Andrzej |
| Zdroj: |
Ochrona Srodowiska; 2017, Vol. 39 Issue 4, p31-40, 10p |
| Abstrakt: |
One of the accepted technological solutions used in mechanical-biological waste treatment is screening of stabilized undersize fraction (code 190599) through a sieve to separate two fractions with the grain size of 20-80 mm (code 190599) and < 20 mm (code 190503 - compost that fails to comply with requirements). Fraction < 20 mm may be used for landfill remediation as a landfill cover. However, its long-lasting exposure to atmospheric conditions may have an adverse effect on microbial respiration. This phenomenon was verified in the field study and lysimetric experiment aimed to simulate landfill conditions, which lasted 10 weeks (both in winter and summer season). The lysimeters contained stabilized fine fraction, while half of the containers were additionally filled with water to reflect adverse conditions at a landfill site resulting from stagnant pond formation. Both the direct measurements and model studies confirmed a significant increase of microbial activity in hydrated waste samples. During remediation works special care should be taken to avoid stagnant pond formation on the landfill top because of the unfavourable pond conditions that facilitate decomposition of organic matter in the stabilized fine fraction. Therefore, biological stabilization of municipal solid waste should be planned to effectively lower organic matter content and minimize moisture of the under-size fraction. It was demonstrated that activity at the level of AT4 < 2 mgO2/g allowed for safe use of the stabilized fine fraction in restoration process of closed landfills. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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