Effectiveness of in-Situ Generated Monochloramine for the Control of Legionella in a Real Industrial Cooling Tower

Effectiveness of in-Situ Generated Monochloramine for the Control of Legionella in a Real Industrial Cooling Tower

Maria Anna Coniglio

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Vito Strano

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Salvatore DaAngelo

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Marco Antonio Guercio

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Raimondo Spada

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Stefano Melada

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University of Catania

Effectiveness of in-Situ Generated Monochloramine for the Control of Legionella in a Real Industrial Cooling Tower

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Abstract

The aim of the study was to determine the effectiveness of in-situ-formed monochloramine for the control of Legionella growth in a real cooling tower system. The cooling tower utilizes an industrial water (makeup) made of by blending industrial raw water and decarbonated raw water. A generator device injecting in-situ-formed monochloramine into the cooling system was installed. The detection of Legionella, heterotrophic plate count (HPC -22°C) and continuous monitoring of oxidation reduction potential (ORP) were carried out to check the efficacy of monochloramine. Water samples were monthly collected for 6 months from the makeup, two collecting basins and the blow-down. Monochloramine was injected at 4 mg/L for 60 days to achieve a mean residual concentration of 0.145 mg/L in the blow-down. Over time, at the same pumping rates, a greater monochloramine residual was achieved so the dosage was decreased at 2.5 mg/L. L. pneumophila decreased from an initial load >10.000 cfu/L to undetectable levels and remained stable till the end of the experimental period while HPC decreased slowly (mean count

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Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

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Not applicable for this article.

How to Cite This Article

Maria Anna Coniglio. 2015. \u201cEffectiveness of in-Situ Generated Monochloramine for the Control of Legionella in a Real Industrial Cooling Tower\u201d. Global Journal of Medical Research - K: Interdisciplinary GJMR-K Volume 15 (GJMR Volume 15 Issue K4).

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GJMR Volume 15 Issue K4

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Journal Specifications

Crossref Journal DOI 10.17406/gjmra

Print ISSN 0975-5888

e-ISSN 2249-4618

Keywords

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Classification

GJMR-K Classification NLMC Code: QW 50

Submission ReceivedFebruary 12, 2015
Peer Review Double Blind
Handling Editor
Accepted March 5, 2015
Published March 15, 2015

Version of record

v1.2

Issue date

June 18, 2015

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Article Matrices

Total Score: 106

Country: Italy

Subject: Global Journal of Medical Research - K: Interdisciplinary

Authors: Maria Anna Coniglio, Vito Strano, Salvatore DaAngelo, Marco Antonio Guercio, Raimondo Spada, Stefano Melada (PhD/Dr. count: 0)

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Total Views: 4214

Total Downloads: 2236

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