Caprolactam waste liquor degradation by various yeasts

Abstract

Waste liquor from caprolactam manufacture contains many mono- and di-carboxylic acids. Of four yeasts tested, Yarrowia lipolytica DS-1 was the best at decreasing Chemical Oxygen Demand values, by up to 60% with 50 and 100 g waste liquor/after 48 h. Caproic, butyric and valeric acids were utilized most easily. Adipic acid was not decreased below 13% (w/v).

Removal of chromium (VI) ions from aqueous solution by adsorption onto two marine isolates of Yarrowia lipolytica

“…This yeast has been used in the remediation of various polluted environments [10][11][12] and is also applied in the degradation of different wastes [13][14][15][16]. Y. lipolytica is able to utilize a variety of renewable carbon sources and the biomass of the fungus has been used as single cell protein or as single cell oil [17,18].…”

Isolation of the ɛ-caprolactam denitrifying bacteria from a wastewater treatment system manufactured with acrylonitrile–butadiene–styrene resin

“…[2]. Y. lipolytica DS-1 was isolated from contaminated soil at a local oil refinery and it could decrease COD by as much as 57% at COD load of 73,600 ppm [5]. P. versutus MDC-3 could utilize 1539 mg/l -caprolactam for denitrification and the removal efficiency of -caprolactam by P. versutus MDC-3 exceeded that by P. aeruginosa MCM B-407 and P. putida MCM B-408.…”

ε-Caprolactam Utilization by Proteus sp. and Bordetella sp. Isolated From Solid Waste Dumpsites in Lagos State, Nigeria, First Report

“…It is found as unreacted monomer in waste water effluents of nylon-6 producing factories, constituting significant pollution load with toxic effect on plants, animals and humans [7]. Also, its solid oligomers and used nylon-6 fibre constitute solid waste materials that end up in dumpsites, eventually to uncontrolled open environment.…”