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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Removal of protozoan (oo)cysts and bacteria during microalgae harvesting: Outcomes from a lab-scale experiment

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Author(s):
de Oliveira, Gabriela Laila [1] ; Erbetta Sueitt, Ana Paula [1] ; dos Santos, Priscila Ribeiro [1] ; Leite, Luan de Souza [1] ; Daniel, Luiz Antonio [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Hydraul & Sanitat, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Chemosphere; v. 286, n. 3 JAN 2022.
Web of Science Citations: 0
Abstract

The efficiency of microalgae harvesting on the removal of Giardia spp. cysts, Cryptosporidium spp. oocysts, total coliforms, Escherichia coli, Enterococcus spp. and Clostridium spp. was assessed in lab-scale experiments (Jartest and Flotatest) using effluent from a flat panel photobioreactor used for Chlorella sorokiniana cultivation. Three harvesting methods were evaluated: (1) flocculation induced by pH modulation followed by sedimentation (pHSED), (2) flocculation induced by pH modulation followed by dissolved air flotation (pH-DAF), and (3) coagulation using an organic coagulant (Tanfloc SG) followed by dissolved air flotation (Coag-DAF). The results indicated that the three harvesting methods were efficient in removing protozoan (oo)cysts and bacteria, achieving percentages of removal higher than 97% for all the analyzed pathogens. Among the three methods, pHSED showed the best removal performance: 99.60% (2.5 log) for Giardia spp. cysts, 100% (>6.3 log) for total coliforms, 100% (>4.6 log) for Escherichia coli, 100% (>5.8 log) for Enterococcus spp. and 99.96% (3.6 log) for Clostridium spp. Clostridium spp. seemed to be more tolerant to the harvesting methods than the other groups of bacteria analyzed in the study, and its presence was positively correlated to the presence of Giardia spp. cysts. (AU)

FAPESP's process: 17/14620-1 - Optimization of Chlorella sorokiniana cultivation in a flat panel photobioreactor and harvest for use as fertilizer
Grantee:Luan de Souza Leite
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 15/02073-0 - Nutrient removal in a tubular photobioreactor fed with UASB effluent treating black water
Grantee:Ana Paula Erbetta Sueitt
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 12/50522-0 - Environmental contamination by protozoa Giardia spp. and Cryptosporidium spp. and Ascaris suum: challenges of detection, removal and inactivation of infective forms
Grantee:Regina Maura Bueno Franco
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 13/50351-4 - Recovering nutrients and carbon from concentrated black water: a sustainable decentralized approach for wastewater treatment
Grantee:Luiz Antonio Daniel
Support Opportunities: Regular Research Grants