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- Title
Inactivation of Ascaris suum eggs in digested and dewatered biosolids with lime and fly ash at bench scale and full scale.
- Authors
Brewster, J; Oleszkiewicz, J; Bujoczek, G; Reimers, R S; Abu-Orf, M; Bowman, D; Fogarty, E
- Abstract
The feasibility of inactivating Ascaris suum eggs spiked into digested and dewatered biosolids from Winnipeg, Manitoba to class A levels (as per USEPA 1993) by storing the biosolids treated with lime (CaO) and (or) fly ash under anoxic conditions was investigated. The study was comprised of two phases. The first phase involved mixing the biosolids with various quantities of lime and (or) fly ash in a Hobart mixer and storing the mixed product in <nobr>16 L</nobr> buckets at <nobr>4–6 °C.</nobr> Phase two involved full-scale mixing of lime and (or) fly ash using a Lödige mixer. The mixed product was buried in trenches and stored for <nobr>356 d</nobr> at naturally occurring environmental temperatures that ranged from –1 to <nobr>33 °C</nobr> in the trench. The lowest lime dose capable of inactivating Ascaris suum eggs to class A levels was <nobr>50 g</nobr> of lime — amended with <nobr>1000 g</nobr> of fly ash per kilogram of dry biosolids. Storage for <nobr>291 d</nobr> at environmentally occurring temperatures was required to meet the class A criteria. Maintaining the higher temperatures for a longer duration would have reduced the time necessary to achieve the target inactivation.
- Subjects
WINNIPEG (Man.); MANITOBA; CANADA; ASCARIS; LIME (Minerals); FLY ash; HELMINTHIASIS
- Publication
Journal of Environmental Engineering & Science, 2003, Vol 2, Issue 5, p395
- ISSN
1496-2551
- Publication type
Article
- DOI
10.1139/s03-041