Heavy metal removal ability of Halomonas elongata and Tetragenococcus halophilus in a media model system as affected by pH and incubation time

Asksonthong R., . and Siripongvutikorn S., . and Usawakesmanee W., . Heavy metal removal ability of Halomonas elongata and Tetragenococcus halophilus in a media model system as affected by pH and incubation time. pp. 234-240. ISSN 2231-7546

A serious public problem in many countries relate to toxic heavy metal contamination throughout the eco-system and food chain particularly in tuna viscera which is a raw material used for human consumption in some areas. Halomonas elongata a halophilic bacteria have been reported to remove Hg Pb and Cd from waste water. In this work 2 specific bacteria namely H. elongata (halophilic bacteria) and Tetragenococcus halophilus (halophilic lactic acid bacteria) were selected and studied for heavy metal removal in the media model system including saline nutrient broth (SNB) and de Man Rogosa and Sharpe broth (MRS-broth). Initial concentration of Hg Pb and Cd was set up 0.5 1 and 3 mg/L respectively. In addition effects of pH and incubation time on metal removal of both organisms were monitored. The result revealed that potential of metal absorption was in the order as PbCdHg in both organisms though not in the same level. H. elongata highly removed Hg Pb and Cd at 69.52- 81.11 97.82 - 98.47 and 74.17 - 89.16 respectively when cultured pH was 5. Percentage removal of Hg and Cd were highest at 8.64 “ 12.69 and 93.50 “ 95.12 respectively when T. halophilus was cultured in media pH 7 while Pb removal was highest at 91.60 “ 96.54 when the organism was cultured in media pH 6. In addition the metal removal generally increased as increased incubation time up to 96 h. Therefore it is possible that addition of H. elongata and T. halophilus as well as optimum condition of bacterial growth would be applied in tuna viscera for heavy metal absorption in next experiment.

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Abstract

A serious public problem in many countries relate to toxic heavy metal contamination throughout the eco-system and food chain particularly in tuna viscera which is a raw material used for human consumption in some areas. Halomonas elongata a halophilic bacteria have been reported to remove Hg Pb and Cd from waste water. In this work 2 specific bacteria namely H. elongata (halophilic bacteria) and Tetragenococcus halophilus (halophilic lactic acid bacteria) were selected and studied for heavy metal removal in the media model system including saline nutrient broth (SNB) and de Man Rogosa and Sharpe broth (MRS-broth). Initial concentration of Hg Pb and Cd was set up 0.5 1 and 3 mg/L respectively. In addition effects of pH and incubation time on metal removal of both organisms were monitored. The result revealed that potential of metal absorption was in the order as PbCdHg in both organisms though not in the same level. H. elongata highly removed Hg Pb and Cd at 69.52- 81.11 97.82 - 98.47 and 74.17 - 89.16 respectively when cultured pH was 5. Percentage removal of Hg and Cd were highest at 8.64 “ 12.69 and 93.50 “ 95.12 respectively when T. halophilus was cultured in media pH 7 while Pb removal was highest at 91.60 “ 96.54 when the organism was cultured in media pH 6. In addition the metal removal generally increased as increased incubation time up to 96 h. Therefore it is possible that addition of H. elongata and T. halophilus as well as optimum condition of bacterial growth would be applied in tuna viscera for heavy metal absorption in next experiment.

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Item Type:	Article
AGROVOC Term:	Bacteria
AGROVOC Term:	Lactic acid bacteria
AGROVOC Term:	Heavy metals
AGROVOC Term:	Tuna
AGROVOC Term:	Absorption
AGROVOC Term:	Alkali treatment
AGROVOC Term:	Culture of microorganisms
AGROVOC Term:	Solvent removal
AGROVOC Term:	Incubation of microorganisms
AGROVOC Term:	Contamination
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/24011

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