Capacity of constructed wetlands to remove parasite eggs from wastewaters in Egypt

Stott, Rebecca; Jenkins, Trisha A.; Bahgat, M.; Shalaby, I.

doi:10.1016/s0273-1223(99)00454-0

Cited by 17 publications

(4 citation statements)

References 4 publications

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“…Based on the general understanding that HRT ¼ 8-10 days is sufficient to achieve the WHO guideline for irrigation (Ayres et al 1992;Bastos et al 2006b), which was somehow confirmed in this work, and assuming pond depth ¼ 0.9 m, and HRT ¼ 10 days, the HLR necessary to achieve # 1 human intestinal nematode egg per litre would be 0.090 m 3 m 22 d 21 . According to the above mentioned works of Stott et al (1999Stott et al ( , 2003, it is herein assumed, in a conservative approach, that 50 m HF gravel bed CW would effectively remove helminth eggs.…”

Section: Helminth Eggs Removalmentioning

confidence: 99%

Post-treatment of UASB reactor effluent in waste stabilization ponds and in horizontal flow constructed wetlands: a comparative study in pilot scale in Southeast Brazil

Bastos

Calijuri

Bevilacqua

et al. 2010

Water Science and Technology

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The results of a 20-month period study in Brazil were analyzed to compare horizontal-flow constructed wetlands (CW) and waste stabilization pond (WSP) systems in terms of land area requirements and performance to produce effluent qualities for surface water discharge, and for wastewater use in agriculture and/or aquaculture. Nitrogen, E. coli and helminth eggs were more effectively removed in WSP than in CW. It is indicated that CW and WSP require similar land areas to achieve a bacteriological effluent quality suitable for unrestricted irrigation (10(3) E. coli per 100 mL), but CW would require 2.6 times more land area than ponds to achieve quite relaxed ammonia effluent discharge standards (20 mg NH(3) L(-1)), and, by far, more land than WSP to produce an effluent complying with the WHO helminth guideline for agricultural use (< or =1 egg per litre).

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Section: Helminth Eggs Removalmentioning

confidence: 99%

Post-treatment of UASB reactor effluent in waste stabilization ponds and in horizontal flow constructed wetlands: a comparative study in pilot scale in Southeast Brazil

Bastos

Calijuri

Bevilacqua

et al. 2010

Water Science and Technology

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“…To remove 100% of helminth ova it is necessary to couple wetlands with a horizontal flow gravel bed. Most of the removal takes place within the first 25 m (Stott et al, 1999).…”

Section: Wetlandsmentioning

confidence: 99%

Helminth ova control in wastewater and sludge for advanced and conventional sanitation

Jiménez

Maya

Galván

2007

Water Science and Technology

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Worldwide, the most important reuse of wastewater, in volume, is agricultural irrigation. Therefore, there is a need to properly treat wastewater for such purpose, considering the removal of pathogens while leaving suitable amounts of nutrients and other compounds to increase productivity. Helminth ova are one of the main targeted pathogens in the new guidelines for water reuse in agriculture and aquaculture issued in 2006 by the World Health Organization. However, relatively little research has been done recently on how to remove and inactivate helminth ova from wastewater and sludge and recommendations given several decades ago are still used, but when put into practice, particularly in developing countries, produce unsatisfactory results. One problem is that these criteria were developed using inaccurate analytical techniques and the other is the large number and variety of helminth ova species found in wastewater and sludge from the developing world. In fact, the few technological options to remove and inactivate helminth ova come from research performed using wastewater and sludge with low helminth ova content, and refer almost only to Ascaris (one type of helminth). This paper summarises recent research work and results from practical experience concerning helminth ova control for advanced and conventional sanitation.

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“…Different mechanisms are used for removal of parasite egg during sewage treatment processes. The main mechanisms are sedimentation, filtration, plant root uptake, entrapment in activated sludge flocs, and inactivation due to adverse environmental conditions (7,34,37,44,46,62,70,(72)(73)(74). In recent years, many studies have been conducted to investigate parasitic contamination in water resources and the results have shown that many of these sources are contaminated with parasitic infections.…”

Section: Discussionmentioning

confidence: 99%

Efficiency of wastewater treatment plants in removal of intestinal parasites: A review approach

Hezarjaribi

Yousefi

Esboei

2020

Environ Health Eng Manag

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Background: Wastewater treatment plants (WWTPs) in urban areas, are potentially one of the causes of the spread and entry of parasitic pathogens into the environment and water resources. Numerous studies have been conducted on the presence of parasitic agents in the entry and effluent of WWTPs in different countries. This study was conducted to review the parasite prevalence in different WWTPs and assess their removal efficiency. Methods: ScienceDirect, Scopus, Web of Science, and PubMed databases and other sites with the ability to receive a full-text related articles, were reviewed. Various keywords such as parasites, wastewater, effluent, treatment efficiency, protozoan cysts, parasitic eggs, and similar keywords were used to search articles published from 2005 to 2019. After screening the titles and abstracts of articles, 26 articles were reviewed in this study. Results: Giardia spp, Cryptosporidium spp, Entamoeba spp, Blastocystis spp, Toxocara spp, Trichostrongylus spp, A. lumbricoides, and Hymenolepis are the most prevalent parasites. Studies show that parasitic egg hatching rates are up to 5%, in aerated lagoons, up to 99.9%, in activated sludge, and up to 5%, in ponds due to high retention time and downstream artificial reefs. Conclusion: Studies show that due to the current state of treatment plants and adverse operating and maintenance conditions, it is not possible to completely remove parasitic pathogens from these systems, therefore, it should be considered by regulatory authorities and the systems need to be improved for better performance of treatment plants and optimizing them, and training of users should also be improved. This review indicated that the types of natural constructed wetland in Kermanshah (Iran) and activated sludge of wastewater treatment processes in Iran and Brazil are most effective in removal of intestinal parasites.

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Capacity of constructed wetlands to remove parasite eggs from wastewaters in Egypt

Cited by 17 publications

References 4 publications

Post-treatment of UASB reactor effluent in waste stabilization ponds and in horizontal flow constructed wetlands: a comparative study in pilot scale in Southeast Brazil

Post-treatment of UASB reactor effluent in waste stabilization ponds and in horizontal flow constructed wetlands: a comparative study in pilot scale in Southeast Brazil

Helminth ova control in wastewater and sludge for advanced and conventional sanitation

Efficiency of wastewater treatment plants in removal of intestinal parasites: A review approach

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