Biodegradation characterisation and kinetics of m-cresol by <i>Lysinibacillus cresolivorans</i>

Abstract

A novel strain of m-cresol-degrading bacterium, named as Lysinibacillus cresolivorans, was isolated from aerobic sludge from a coking wastewater treatment plant. This bacterium is able to utilise m-cresol as its sole source of carbon and energy. The optimal pH for growth is 6.8 ~ 7.3 and the optimal temperature is 35°C. Compared to organic nitrogen sources, inorganic nitrogen sources were easily utilised for the m-cresol biodegradation. The degradation rate of m-cresol at different starting concentrations was analysed with zero-order kinetic characteristics. When the initial concentration of m-cresol was 224.2 mg•ℓ-1 , the reaction rate reached a maximum at 46.80 mg•(ℓ•h)-1 .The cell growth kinetics was also investigated with initial m-cresol concentrations varying from 0 to 1 200 mg•ℓ-1. The growth kinetics was well described by the Haldane kinetic models. The parameter values of m-cresol on cell growth were μ max = 0.89 h-1 , K s = 426.25 mg•ℓ-1 , K i = 51.26 mg•ℓ-1. Experiments supplementing growth with glucose indicated that this substrate increased the biomass, and also induced the biodegradation of m-cresol. From the results, it can be concluded that Lysinibacillus cresolivorans is an efficient m-cresoldegrading bacterium and that glucose plays multiple roles in the co-substrate condition.

Seasonal and spatial variation in the sediment bacterial community and diversity of Lake Bosten, China

“…Both were dominant bacteria in the lake center area but were not detected in the macrophyte‐dominated area, and the genus Lysinibacillus was characterized by extremely high abundance in the lake center area in winter, which may reflect the presence of obligate aerobic bacteria. Related studies have shown that some strains of the genus Lysinibacillus are integral in denitrification, desulfurization, sulfur removal, and biodegradation; can degrade cresols, sulfides, and other pollutants; and are major participants in the treatment of industrial wastewater . The TN and TP contents in the lake center area were low, which may be related to the nitrogen and phosphorus removal characteristics of the genus Lysinibacillus .…”

Atmospheric-pressure dielectric barrier discharge generation by a full-bridge flying capacitor multilevel inverter

“…This is an apparent manifestation of the importance of the reactive oxygen species in the organic degradation process. m-cresol has been removed by biological [29][30][31][32][33][34][35] and adsorption [36,37] methods. These methods exhibit good elimination efficiency at low concentrations of m-cresol; however, it is known that the generation of some by-products can be toxic to bacteria, which may reduce their effectiveness.…”

Analytical study of effective biodegradation of p-cresol using Serratia marcescens ABHI001: application in bioremediation

“…Furthermore, they conducted batch experiments at different concentrations of p-cresol and found that the maximum degradation occurs at a concentration of 200 mg/L (Surkatti and El-Naas 2014). Yao et al (2011) identified a novel m-cresol-degrading strain named Lysinibacillus cresolivorans. They investigated the degradation rate of m-cresol at concentrations ranging from 54.1 to 529.1 mg/L.…”