Performance of a small-scale wastewater treatment plant for removal of pathogenic protozoa (oo)cysts and indicator microorganisms

Medeiros, Raphael Corrêa; Daniel, Luiz Antônio; Oliveira, Gabriela Laila de; Hoffmann, Maria Teresa

doi:10.1080/09593330.2018.1480063

Cited by 16 publications

(3 citation statements)

References 44 publications

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“…Also, 5 treatment systems out of 29 systems (17.24%), had 100% efficacy in removing worms and protozoa. While the results of recent studies have shown that about 82.75% of treatment plants had not 100% efficiency in removing worms and protozoa (14,29,43,44,51,53,(55)(56)(57)60,61,72). Overall, helminth infections, including parasitic eggs and larvae, are more easily removed by the treatment systems compared to the protozoans.…”

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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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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“…In addition, several studies have reported that decentralized systems efficiently reduce pathogens, including bacteria (Salmonella and E. coli) [12], protozoans (Giardia spp.) [13], helminths (Ascaris lumbricoides) [14], hookworms (Strongyloides stercoralis) and trophozoites (Trichomonas and Enterobius vermicularis) [12]. Therefore, adequate wastewater treatment systems that produce safe treated wastewater for reuse and resources, whether centralized or decentralized, are crucial for further recovery, reuse and recycling.…”

Section: Introductionmentioning

confidence: 99%

On-Site Blackwater Treatment Fosters Microbial Groups and Functions to Efficiently and Robustly Recover Carbon and Nutrients

et al. 2020

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Wastewater is considered a renewable resource water and energy. An advantage of decentralized sanitation systems is the separation of the blackwater (BW) stream, contaminated with human pathogens, from the remaining household water. However, the composition and functions of the microbial community in BW are not known. In this study, we used shotgun metagenomics to assess the dynamics of microbial community structure and function throughout a new BW anaerobic digestion system installed at The Netherlands Institute of Ecology. Samples from the influent (BW), primary effluent (anaerobic digested BW), sludge and final effluent of the pilot upflow anaerobic sludge blanket (UASB) reactor and microalgae pilot tubular photobioreactor (PBR) were analyzed. Our results showed a decrease in microbial richness and diversity followed by a decrease in functional complexity and co-occurrence along the different modules of the bioreactor. The microbial diversity and function decrease were reflected both changes in substrate composition and wash conditions. Our wastewater treatment system also decreased microbial functions related to pathogenesis. In summary, the new sanitation system studied here fosters microbial groups and functions that allow the system to efficiently and robustly recover carbon and nutrients while reducing pathogenic groups, ultimately generating a final effluent safe for discharge and reuse.

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“…In addition, several studies have reported that decentralized systems e ciently reduce pathogens, including bacteria (Salmonella and E. coli) [11], protozoans (Giardia spp.) [12], helminths (Ascaris lumbricoides) [13], hookworms (Strongyloides stercoralis) and trophozoites (Trichomonas and Enterobius vermicularis) [11]. Therefore, adequate wastewater treatment systems that produce safe treated wastewater for reuse and resources, whether centralized or decentralized, are crucial for further recovery, reuse and recycling.…”

Section: Introductionmentioning

confidence: 99%

On-Site Blackwater Treatment Fosters Microbial Groups and Functions to Efficiently and Robustly Recover Carbon and Nutrients

Kuramae

Dimitrov

Silva

et al. 2020

Preprint

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Background: Wastewater is considered as a renewable resource water and energy. An advantage of decentralized sanitation systems is the separation of the blackwater (BW) stream, which is highly contaminated with human pathogens, from the remaining household water. However, the composition and functions of the microbial community in BW are not known. In this study, we used shotgun metagenomics to assess the dynamics of microbial community structure and function throughout a new BW anaerobic digestion system installed at The Netherlands Institute of Ecology. Samples from the influent (BW), primary effluent (anaerobic digested BW), sludge and final effluent of the pilot upflow anaerobic sludge blanket (UASB) reactor and microalgae pilot tubular photobioreactor (PBR) were analyzed.Results: Our results showed a decrease in microbial richness and diversity followed by a decrease in functional complexity and co-occurrence along the different modules of the bioreactor. The microbial diversity and function decrease were reflected both changes in substrate composition and wash conditions. The most prevalent core functions in influent (BW) were related to metabolism of carbohydrates, response to chemicals and drugs, and nitrogen. The core functions in anaerobic digested BW and upflow anaerobic sludge blanket reactor were related to response to stress, viral processes and iron-sulfur metabolism. Methanogenesis-related functions were most abundant in upflow anaerobic sludge blanket reactor. Effluent from tubular photobioreactor presented high abundances of functions related to nitrogen utilization, metal ion binding and antibiotic biosynthetic processes. Interestingly, the abundance of sequences related to ‘pathogenesis’ decreased from influent BW to SP1 to effluent from tubular photobioreactor. Our wastewater treatment system also decreased potential microbial functions related to pathogenesis. Conclusions: The new sanitation system studied here fosters microbial groups and functions that allow the system to efficiently and robustly recover carbon and nutrients while reducing pathogenic groups, ultimately generating a final effluent safe for discharge and reuse.

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Performance of a small-scale wastewater treatment plant for removal of pathogenic protozoa (oo)cysts and indicator microorganisms

Cited by 16 publications

References 44 publications

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

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

On-Site Blackwater Treatment Fosters Microbial Groups and Functions to Efficiently and Robustly Recover Carbon and Nutrients

On-Site Blackwater Treatment Fosters Microbial Groups and Functions to Efficiently and Robustly Recover Carbon and Nutrients

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