Fig. 4

Growth pattern of a K. varians MB2, b Achromobacter xylosoxidans MC1, c Burkholderia cepacia MD1 on SEO in the presence of different concentrations of the mixture of Cu ²⁺, Pb²⁺, and Zn²⁺ ( No metal, 250 μg mL⁻¹, , 50 μg mL⁻¹ 75 μg mL⁻¹), and d quantity of SEO degraded over a period of 7 days