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Correction published on 22 September 2015, see Water 2015, 7(9), 5152-5154.

Open AccessArticle
Water 2015, 7(5), 2402-2421; doi:10.3390/w7052402

Helminth Egg Removal Capacity of UASB Reactors under Subtropical Conditions

1
Environmental Engineering Faculty, National University of Engineering, Lima 25, Peru
2
Sub-Department of Environmental Technology, University of Wageningen, Wageningen 6700 AA, The Netherlands
3
Lettinga Associates Foundation (LeAF), P.O. Box 500, Wageningen 6700 AM, The Netherlands
5
Unesco-IHE Institute for Water Education, Westvest 7, Delft 2611 AX, The Netherlands
*
Author to whom correspondence should be addressed.
Academic Editor: Marc Henry
Received: 10 February 2015 / Accepted: 15 May 2015 / Published: 21 May 2015
(This article belongs to the Special Issue Water Treatment and Human Health)
View Full-Text   |   Download PDF [642 KB, uploaded 9 June 2015]   |  

Abstract

This research was conducted to study the anaerobic sludge filtration capacity regarding helminth egg removal in upflow anaerobic sludge blanket (UASB) reactors. Two 25 L lab-scale UASB reactors were operated at an ambient temperature which varied between 17.1 and 28.6 °C. Ascaris suum egg was selected as the model egg considering its similarity in terms of size and morphology to Ascaris lumbricoides, a human pathogen. Ascaris suum eggs were obtained from female parasites of infected pigs. The anaerobic sludge filtration capacity was performed applying upflow velocities between 0.09 and 0.68 m·h−1. Three sludge bed heights in the range of 0.30–0.40 m, 0.50–0.60 m and 0.60–0.70 m were applied. These sludge bed heights corresponded to 19%–25%, 31%–38% and 38%–44% of the total reactor height, respectively. Under the mentioned conditions, the average helminth egg removal efficiency was reciprocally correlated to the imposed upflow velocity. The studied lab-scale reactors reported an average helminth egg removal between 34%–100%, 30%–91% and 34%–56%, when the sludge bed in the UASB reactor was 19%–25%, 31%–38% and 38%–44% of the total reactor height, respectively. The decreased filtration capacity at increasing sludge bed heights might be likely related to biogas production and channeling formation. The average helminth egg removal efficiency in the control experiments performed without any sludge bed, by plain sedimentation, varied between 44% and 66%. View Full-Text
Keywords: helminth eggs; Ascaris suum; pathogens; UASB reactor; sludge bed filtration capacity helminth eggs; Ascaris suum; pathogens; UASB reactor; sludge bed filtration capacity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yaya-Beas, R.-E.; Ayala-Limaylla, C.; Kujawa-Roeleveld, K.; van Lier, J.B.; Zeeman, G. Helminth Egg Removal Capacity of UASB Reactors under Subtropical Conditions. Water 2015, 7, 2402-2421.

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