Chelators enhanced biocide inhibition of planktonic sulfate-reducing bacterial growth |
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Authors: | J Wen K Zhao T Gu I Raad |
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Institution: | (1) Department of Chemical and Biomolecular Engineering, Ohio University, Athens, OH 45701, USA;(2) Department of Infectious Diseases, Infection Control, and Employee Health, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77230, USA; |
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Abstract: | Biocides are currently the primary mitigation method to control sulfate-reducing bacteria (SRB) in biofouling, reservoir souring
and microbiologically influenced corrosion. Increasingly restrictive environmental regulations and safety concerns on biocide
uses demand more efficient dosing of biocides. Chelators have been known to enhance antibiotics because of their properties
such as increasing the permeability of the outer cell membrane of Gram-negative bacteria. Two readily biodegradable chelators,
ethylenediaminedisuccinate (EDDS) and N-(2-hydroxyethyl)iminodiacetic acid (HEIDA) disodium salts that are touted as potential replacements of ethylenediaminetetraacetic
acid (EDTA), were evaluated as potential biocide enhancers for glutaraldehyde and tetrakis hydroxymethyl phosphonium sulfate
(THPS) in their inhibition of planktonic SRB growth. Desulfovibrio vulgaris ATCC 7757 and Desulfovibrio desulfuricans ATCC 14563 were grown in modified ATCC 1249 medium and in enriched artificial seawater, respectively. Laboratory tests in
100 ml anaerobic vials showed that EDDS or HEIDA alone did not inhibit SRB growth. However, when EDDS or HEIDA was combined
with glutaraldehyde or THPS, each of them enhanced the biocide inhibition of planktonic SRB growth. |
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