Senecal-Smith, Jenna and Nordin, Annika and Vinnerås, Björn
(2020).
Fate of Ascaris at various pH, temperature and moisture levels.
Journal of Water and Health. 18
, 375-382
[Journal article]
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Abstract
Soil-transmitted helminths (STH) are intestinal worms that infect 24% of the world’s population. Stopping the spread of STH is difficult, as the eggs are resilient (can withstand high pH) and persistent (can remain viable in soils for several years). To ensure that new sanitation systems can inactivate STH, a better understanding of their resilience is required. This study assessed the inactivation of Ascaris eggs under various conditions, in terms of moisture content (MC) (90%), temperature (20–50 C) and pH (7–12.5). The results highlight that the exposure of Ascaris eggs to elevated pH (10.5–12.5) at temperatures 27.5 C for >70 days had no effect on egg viability. Compounding effects of alkaline pH (10.5) or decreasing MC (<20%) was observed at 35 C, with pH having more of an effect than decreasing MC. To accelerate the inactivation of STH, an increase in the treatment temperature is more effective than pH increase. Alkaline pH alone did not inactivate the eggs but can enhance the effect of ammonia, which is likely to be present in organic wastes.
Authors/Creators: | Senecal-Smith, Jenna and Nordin, Annika and Vinnerås, Björn | ||||
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Title: | Fate of Ascaris at various pH, temperature and moisture levels | ||||
Year of publishing : | 2020 | ||||
Volume: | 18 | ||||
Page range: | 375-382 | ||||
Number of Pages: | 8 | ||||
Publisher: | IWA Publishing | ||||
ISSN: | 1477-8920 | ||||
Language: | English | ||||
Publication Type: | Journal article | ||||
Article category: | Scientific peer reviewed | ||||
Version: | Published version | ||||
Copyright: | Creative Commons: Attribution 4.0 | ||||
Full Text Status: | Public | ||||
Subjects: | (A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science (A) Swedish standard research categories 2011 > 3 Medical and Health Sciences > 303 Health Sciences > Public Health, Global Health, Social Medicine and Epidemiology | ||||
Keywords: | disease transmission, helminths, nutrient recycling, sanitisation, STH | ||||
URN:NBN: | urn:nbn:se:slu:epsilon-p-105755 | ||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105755 | ||||
Additional ID: |
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ID Code: | 17268 | ||||
Faculty: | NJ - Fakulteten för naturresurser och jordbruksvetenskap | ||||
Department: | (NL, NJ) > Dept. of Energy and Technology | ||||
Deposited By: | SLUpub Connector | ||||
Deposited On: | 18 Aug 2020 07:13 | ||||
Metadata Last Modified: | 15 Jan 2021 19:46 |
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