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Pubmed ID :28861053
Publication Date : 2017/09/01

Enhanced Biocide Treatments with D-amino Acid Mixtures against a Biofilm Consortium from a Water Cooling Tower.


Different species of microbes form mixed-culture biofilms in cooling water systems. They cause microbiologically influenced corrosion (MIC) and biofouling, leading to increased operational and maintenance costs. In this work, two D-amino acid mixtures were found to enhance two non-oxidizing biocides [tetrakis hydroxymethyl phosphonium sulfate (THPS) and NALCO 7330 (isothiazoline derivatives)] and one oxidizing biocide [bleach (NaClO)] against a biofilm consortium from a water cooling tower in lab tests. Fifty ppm (w/w) of an equimass mixture of D-methionine, D-leucine, D-tyrosine, D-tryptophan, D-serine, D-threonine, D-phenylalanine, and D-valine (D8) enhanced 15 ppm THPS and 15 ppm NALCO 7330 with similar efficacies achieved by the 30 ppm THPS alone treatment and the 30 ppm NALCO 7330 alone treatment, respectively in the single-batch 3-h biofilm removal test. A sequential treatment method was used to enhance bleach because D-amino acids react with bleach. After a 4-h biofilm removal test, the sequential treatment of 5 ppm bleach followed by 50 ppm D8 achieved extra 1-log reduction in sessile cell counts of acid producing bacteria, sulfate reducing bacteria, and general heterotrophic bacteria compared with the 5 ppm bleach alone treatment. The 10 ppm bleach alone treatment showed a similar efficacy with the sequential treatment of 5 ppm bleach followed by 50 ppm D8. The efficacy of D8 was found better than that of D4 (an equimass mixture of D-methionine, D-leucine, D-tyrosine, and D-tryptophan) in the enhancement of the three individual biocides against the biofilm consortium.

Authors : Jia Ru , Li Yingchao , Al-Mahamedh Hussain H , Gu Tingyue ,

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EIAAB46684 Homo sapiens,Human,Monocyte amino acid permease 2,MOP-2,SLC7A7,Solute carrier family 7 member 7,y(+)L-type amino acid transporter 1,Y+L amino acid transporter 1,Y+LAT1,y+LAT-1
EIAAB36973 Amino acid transporter A2,ATA2,Homo sapiens,Human,KIAA1382,Protein 40-9-1,SAT2,SLC38A2,SNAT2,Sodium-coupled neutral amino acid transporter 2,Solute carrier family 38 member 2,System A amino acid trans
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EIAAB36967 Amino acid transporter A1,Ata1,Glnt,Glutamine transporter,N-system amino acid transporter 2,Rat,rATA1,Rattus norvegicus,Sa2,Sat1,Slc38a1,Snat1,Sodium-coupled neutral amino acid transporter 1,Solute ca
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EIAAB36969 Amino acid transporter A1,ATA1,Homo sapiens,Human,NAT2,N-system amino acid transporter 2,SAT1,SLC38A1,SNAT1,Sodium-coupled neutral amino acid transporter 1,Solute carrier family 38 member 1,System A a
EIAAB36972 Amino acid transporter A2,Bos taurus,Bovine,Protein 40-9-1,SLC38A2,SNAT2,Sodium-coupled neutral amino acid transporter 2,Solute carrier family 38 member 2,System A amino acid transporter 2,System A tr
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