Abstract
The use of lagooning as a complementary natural method of treating secondary effluents of wastewater treatment plants has been employed as an affordable and easy means of producing reclaimed water. However, using reclaimed water for some purposes, for example, for food irrigation, presents some risks if the effluents contain microbial pathogens. Classical bacterial indicators that are used to assess faecal contamination in water do not always properly indicate the presence of bacterial or viral pathogens. In the current study, the presence of faecal indicator bacteria (FIB), heterotrophic bacterial counts (HBC), pathogens and opportunistic pathogens, such as Legionella spp., Aeromonas spp., Arcobacter spp., free-living amoeba (FLA), several viral indicators (human adenovirus and polyomavirus JC) and viral pathogens (noroviruses and hepatitis E virus) were analysed for 1 year in inlet and outlet water to assess the removal efficiency of a lagooning system. We observed 2.58 (1.17–4.59) and 1.65 (0.15–3.14) log reductions in Escherichia coli (EC) and intestinal enterococci (IE), respectively, between the inlet and outlet samples. Genomic copies of the viruses were log reduced by 1.18 (0.24–2.93), 0.64 (0.12–1.97), 0.45 (0.04–2.54) and 0.72 (0.22–2.50) for human adenovirus (HAdV), JC polyomavirus (JCPyV) and human noroviruses (NoV GI and GII), respectively. No regrowth of opportunistic pathogens was observed within the system. FLA, detected in all samples, did not show a clear trend. The reduction of faecal pathogens was irregular with 6 out of 12 samples and 4 out of 12 samples exceeding the EC and IE values, specified in the Spanish legislation for reclaimed water (RD 1620/2007). This data evidences that there is a need for more studies to evaluate the removal mechanisms of lagooning systems in order to optimize pathogen reduction. Moreover, surveillance of water used to irrigate raw edible vegetables should be conducted to ensure the fulfilment of the microbial requirements for the production of safe reclaimed water.
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Acknowledgments
The study reported here was partially founded by programa Recercaixa 2012 ACUP-00300 and AGL2011-30461-C02-01/ALI of the Spanish Ministry of Science and Innovation and Consolidated Research Groups Program of the Catalan Government (2014SGR529 and VirBaP 2014SRG914). Xavier Fernandez-Cassi and Fadua Latif-Eugenín acknowledge the AGAUR Agency of the Catalan Government and the Universitat Rovira i Virgili, respectively, which supported their PhD grants. The authors would like to thank the lagooning system manager, Conrad Martorell, for his collaboration during this project.
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Fernandez-Cassi, X., Silvera, C., Cervero-Aragó, S. et al. Evaluation of the microbiological quality of reclaimed water produced from a lagooning system. Environ Sci Pollut Res 23, 16816–16833 (2016). https://doi.org/10.1007/s11356-016-6812-0
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DOI: https://doi.org/10.1007/s11356-016-6812-0