Journal of Environmental Biology

Optimization of Xhhh strain biodegradation with metal ions for

pharmaceautical wastewater treatment

 

S.L. Sun^{1, 2}, B. Wu¹, D.Y. Zhao¹, X.X. Zhang*¹, Y. Zhang¹, W.X. Li³ and S.P. Cheng¹

¹State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment,

Nanjing University, Nanjing - 210 093, China

²Water Industry Business Branch, GCL Engineering Limited, Nanjing - 210 008, China

³Nanjing Institute of Environmental Sciences, Ministry of Environmental

Protection of China, Nanjing - 210 042, China

(Received: June 11, 2008; Revised received: October 14, 2008; Accepted: January 27, 2009)

 

Abstract: Effects of three ions, Mn²⁺, Cu²⁺ and Zn²⁺ on biological treatment of pharmaceutical wastewater by a functional strain Xhhh were investigated. Through orthogonal tests, Cu²⁺ was determined to be the most important factor influencing Xhhh biodegradation performance. Biodegradation kinetic experiments demonstrated that with Cu²⁺concentration at about 2.00 mg l^-1, the maximum of specific growth rate and specific degradation rate were obtained to be 0.033 and 0.075 d^-1, respectively. The optimal levels of Mn²⁺ (5.00 mg l^-1), Cu²⁺ (2.00 mg l^-1) and Zn²⁺ (5.00 mgl ^-1) were achieved based on experimental results of their effects on the activities of manganese peroxidase and lignin peroxidase, and biodegradation kinetic parameters. Among three types of biodegradation kinetic models (Monod, Tessier and Contois), Tessier model was found most reasonable for kinetics description of Xhhh growth (R² = 0.995) and pollutants degradation (R² = 0.970) in the case of metals optimization. Both kinetics evaluation and experimental results demonstrated that optimization with the three metals made a great contribution to Xhhh growth and COD removal for pharmaceutical wastewater treatment.

Key words: Metal ions, Functional strain, Pharmaceutical wastewater, Biodegradation kinetics, Peroxidase

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