Survival and chromate reducing ability ofPseudomonas aeruginosain industrial effluents

Abstract

The ability of a chromate‐reducing Pseudomonas aeruginosa strain, isolated from tannery effluent, to survive and reduce chromate in the effluent of a tannery and an electroplating unit was evaluated. The test strain survived in the native tannery effluent but numbers fell sharply in the native electroplating effluent. Supplementation with a carbon (C), nitrogen (N) and phosphorus (P) source supported bacterial multiplication and chromate reduction in both types of effluents with almost equal efficiency. Chromate reduction, however, was not observed in the absence of C, N or P supplement, or in the chromate‐reducing strain.

Comparative study of Cr(VI) uptake and reduction in industrial effluent by Ochrobactrum intermedium and Brevibacterium sp.

“…Both strains also converted Cr(VI) to Cr(III) in an industrial sample. Ganguli & Tripathi (1999) observed the reduction of Cr(VI) in industrial effluent by Pseudomonas aeruginosa isolated from tannery effluent but they used only 15 lg Cr(VI) ml )1 . Both our strains reduced up to 300 lg Cr(VI) ml )1 suggesting that they may have a useful biotechnological role in this capacity.…”

Hexavalent Chromium Removal by a Trichoderma inhamatum Fungal Strain Isolated from Tannery Effluent

“…This indicates that this fungus developed the Cr(VI)-resistant and Cr(VI)-reducing mechanisms while growing in the chromium-containing effluent. A variety of micro-organisms with the Cr(VI)-resistant and Cr (VI)-reducing ability have been isolated from effluents of tanneries (Badar et al 2000;Ganguli and Tripathi 1999;Pattanapipitpaisal et al 2001a;Ramírez-Ramírez et al 2004;Shakoori et al 2000).…”

Reduction of hexavalent chromium by Sphaerotilus natans a filamentous micro-organism present in activated sludges

“…Cr(III) is more stable, less soluble and less toxic than Cr(VI) [10] and can be removed from the system as chromium hydroxide that precipitates at neutral pH [11]. Many bacterial genera have been reported to reduce Cr(VI) to Cr(III) including Bacillus [12], Pseudomonas [13], Escherichia [14], Arthrobacter [15], Ochrobactrum [16], Brevibacterium [17], Shewanella [18].…”