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Performance Evaluation of Waste Stabilization Ponds on Removal of Listeria Spp.: A Case Study of Isfahan, Iran Publisher Pubmed



Taherkhani A1 ; Attar HM1 ; Mirzaee SA2 ; Ahmadmoazzam M2 ; Jaafarzadeh N2 ; Hashemi F2 ; Jalali M4
Authors
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Authors Affiliations
  1. 1. Environment Research Center, Isfahan University of Medical Sciences (IUMS), Isfahan, Iran
  2. 2. Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
  3. 3. Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
  4. 4. Infectious Disease and Tropical Medicine Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Journal of Water and Health Published:2018


Abstract

The aim of the present study was to assess performance of waste stabilization ponds (WSPs) on the removal of Listeria spp. in Isfahan, Iran. A total of 104 samples were taken from eight sampling locations from influent and effluent of a wastewater treatment plant (WWTP). Sewage samples were analyzed for the presence of Listeria spp. using selective enrichment protocol. Listeria isolates were also identified by biochemical and polymerase chain reaction (PCR) amplification. Listeria spp. was enumerated by a three tube most probable number (MPN) for total coliform counts (TC), fecal coliform counts (FC), total suspended solids (TSS), and total dissolved solids (TDS). In total, 54/104 (51.92%), 49/104 (47.11%), 36/104 (34.61%), and 27/104 (25.95%) samples were positive for Listeria spp., L. monocytogenes, L. innocua, and L. seeligeri, respectively. The mean MPN/100 mL enumeration of L. monocytogenes for influent, anaerobic, facultative ponds 1, 2, 3, 4 and maturation ponds 1 and 2 were 21.54, 10.61, 8, 5.77, 4, 2.54, 1.38, and 0.46, respectively. The removal percentage of Listeria spp. in the anaerobic, facultative, and maturation ponds were 44.71, 76.5, and 81.4%, respectively. Results showed that the WSPs were able to decrease the Listeria spp. levels significantly, although unable to remove them completely. © IWA Publishing 2018.
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