Application of Activated Biomaterial in the Rapid Start-up and Stable Operation of Biological Processes for Removal Cadmium from Effluent

Abstract

With the aim of treating effluent containing Cd²⁺, a low-cost and efficient technique has been established in this work. By a combination of sulfate-reducing bacteria (SRB), carboxymethyl konjac glucomannan (CMKGM), and nickel–iron bimetallic (Ni/Fe) nanoparticles, we greatly enhanced Cd²⁺ removal and bacteria resistance to metals toxicity. Furthermore, it had much higher removal efficiencies (99.72%) than SRB (57.38%), CMKGM (52.46%), and Ni/Fe (58.91%) systems after 48 h in the treat processes. The parameters effecting Cd²⁺ removal of this system were obtained: the initial Cd²⁺ concentrations 150 mg/L, optimum pH 7.0, optimum temperature 37 °C, optimum time 48 h, respectively. CMKGM and SRB played significant roles in Cd²⁺ adsorption as they contained many functional groups on their surfaces. In addition, SRB promoted the degeneration of inorganic contaminants. The mechanism of adsorption was clarified by a serious of analysis. Overall, this study provided a highly efficient activated biomaterial for the practical treatment of Cd²⁺ in wastewater.

http://ift.tt/2hO0c6m