Phosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluids

Metalworking fluids (MWFs) are used as lubricants and coolants in the manufacturing operations. Their biodeterioration, while in operation, is a widespread problem leading to poor performance and worker health issues. Adding biocides, though effective in reducing microbial growth, leads to the produ...

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Main Authors: Azimi, Y, Thompson, I
Format: Journal article
Language:English
Published: American Chemical Society 2017
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author Azimi, Y
Thompson, I
author_facet Azimi, Y
Thompson, I
author_sort Azimi, Y
collection OXFORD
description Metalworking fluids (MWFs) are used as lubricants and coolants in the manufacturing operations. Their biodeterioration, while in operation, is a widespread problem leading to poor performance and worker health issues. Adding biocides, though effective in reducing microbial growth, leads to the production of more recalcitrant wastewaters that are difficult to dispose or recycle on-site. Increasing environmental concerns have led to robust legislation for reducing/eliminating the use of toxic biocides in MWFs, stimulating a growing interest in the development/application of alternative biological preservation strategies. In this study, inducing nutrient imbalance was investigated for controlling microbial growth in MWFs. Phosphorus was immobilized employing insoluble La2O3 to form LaPO4. Concentrations of La2O3 greater than 0.08%w (%w = weight percent) completely inhibited microbial growth (from 1.4 × 107 to 0 CFU/mL) and hindered biodegradation. Raman spectroscopy suggested that La2O3 converted intracellular phosphorus into LaPO4. The growth inhibition potentials of both 0.06%w La(NO3)3 and La2O3 were found to be superior to formaldehyde. The antimicrobial property of La2O3 (i.e., inhibition) was tenable by adding sufficient phosphate, acting as an on/off switch for controlling microbial growth in MWFs. This technology offers the potential to reduce/eliminate the use of biocides in MWFs, improves the feasibility of end-of-life biological treatment, and closes the water loop.
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spelling oxford-uuid:b7578fa9-11d7-4202-a0b7-423dd9a80a292022-03-27T04:47:47ZPhosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluidsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b7578fa9-11d7-4202-a0b7-423dd9a80a29EnglishSymplectic Elements at OxfordAmerican Chemical Society2017Azimi, YThompson, IMetalworking fluids (MWFs) are used as lubricants and coolants in the manufacturing operations. Their biodeterioration, while in operation, is a widespread problem leading to poor performance and worker health issues. Adding biocides, though effective in reducing microbial growth, leads to the production of more recalcitrant wastewaters that are difficult to dispose or recycle on-site. Increasing environmental concerns have led to robust legislation for reducing/eliminating the use of toxic biocides in MWFs, stimulating a growing interest in the development/application of alternative biological preservation strategies. In this study, inducing nutrient imbalance was investigated for controlling microbial growth in MWFs. Phosphorus was immobilized employing insoluble La2O3 to form LaPO4. Concentrations of La2O3 greater than 0.08%w (%w = weight percent) completely inhibited microbial growth (from 1.4 × 107 to 0 CFU/mL) and hindered biodegradation. Raman spectroscopy suggested that La2O3 converted intracellular phosphorus into LaPO4. The growth inhibition potentials of both 0.06%w La(NO3)3 and La2O3 were found to be superior to formaldehyde. The antimicrobial property of La2O3 (i.e., inhibition) was tenable by adding sufficient phosphate, acting as an on/off switch for controlling microbial growth in MWFs. This technology offers the potential to reduce/eliminate the use of biocides in MWFs, improves the feasibility of end-of-life biological treatment, and closes the water loop.
spellingShingle Azimi, Y
Thompson, I
Phosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluids
title Phosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluids
title_full Phosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluids
title_fullStr Phosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluids
title_full_unstemmed Phosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluids
title_short Phosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluids
title_sort phosphorus depletion as a green alternative to biocides for controlling biodegradation of metalworking fluids
work_keys_str_mv AT azimiy phosphorusdepletionasagreenalternativetobiocidesforcontrollingbiodegradationofmetalworkingfluids
AT thompsoni phosphorusdepletionasagreenalternativetobiocidesforcontrollingbiodegradationofmetalworkingfluids