Isolation, Identification and Decolonization Characteristics of a New Methyl Red Degrading Bacterial Strain Paracoccus sp.L-4

doi:10.13560/j.cnki.biotech.bull.1985.2016.02.019

Abstract

Abstract: The strain Paracoccus sp.L-4 was isolated from Paracoccussp.at first time, and it had the strong ability to degrade methyl red.In LB medium, methyl red in the concentration of 100 mg/L was degraded 91.74% in 16 h, and approximately 100% in 2 d.Furthermore, the optimal conditions for degrading methyl red were 25-30℃ and pH6.0-7.0, respectively.And Zn²⁺, Co²⁺, Cu²⁺, Ag⁺, Al³⁺, Fe³⁺ andFe²⁺ had an significant inhibitory effects on the degradation of methyl red.The degradation and decolorization of methyl red by strain L-4 was performed well in both aerobic and anoxic conditions.When the volume of liquid was ≤ 100 mL, the ratio of decolorization decreased with the increase of volume of liquid.However, when the amount of liquid was ≥ 125 mL, the degradationrate of methyl red was still over 40% at 12 h, indicating that strain L-4 hasa potential application value inbiological treatmentof dye wastewater.

Key words: methyl red, Paracoccus sp.L-4, isolation, identification, degradation characteristics

CHEN Liang, WANG Li. Isolation, Identification and Decolonization Characteristics of a New Methyl Red Degrading Bacterial Strain Paracoccus sp.L-4[J]. Biotechnology Bulletin, 2016, 32(2): 146-151.

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