Experimental Study on the Treatment of Cd(II) by Corn Stalk Biochar-Supported Sulfate-Reducing Bacteria

In order to control the pollution of Cd(II)-containing wastewater, corn stalk biochar-supported sulfate-reducing bacteria (CSBSSRB) composite material was studied to synergistically remove Cd(II) by coupling biological reduction and adsorption. Based on batch experiments, the effects of composite dosage, reaction time, and initial concentration of Cd(II) on the adsorption of Cd(II) by CSBSSRB were investigated. The adsorption kinetics and adsorption isotherms of Cd(II) on CSBSSRB were systematically studied. The results showed that, when the dosage of CSBSSRB was 0.2 g, the initial concentration of Cd(II) was 100 mg/L, and the adsorption time was 48 h, and the removal rate of Cd(II) and adsorption capacity by CSBSSRB were 90.69% and 45.35 mg/g, respectively. The adsorption process of Cd(II) by CSBSSRB conforms to pseudo-first-order kinetics and Langmuir isothermal model, and intra-particle diffusion is not the only rate-limiting step. The above results indicated that CSBSSRB was a good Cd(II) adsorbent, and that it had certain application potential in the remediation of wastewater containing Cd(II).