Treatment of Organic Wastewater Containing Cr~(3+) by a Novel Complex Process of Electrodeposition and Biofilm

摘要

A novel complex process of electrodeposition and biofilm is utilized to treat organic wastewater containing Cr~(3+), and its purifying mechanism is also described in this article. In details, organic materials in wastewater are consumed as nutritious source by biofilm composed of microorganism and EPS ( extracellular pol-ysaccharide substance). While one part of heavy metal ions, such as Cr~(3+), is removed by electrodeposition, the other part is adsorbed on biofilm. In contrast, experimental data of single electrodeposition or biofilm process are listed. Further, the kinetic curves of microbes cultivated or microbes acclimated by Cr~(3+) to degrade glucose are provided, too. In conclusion, the experimental results indicate that initial wastewater consists of C_6H_(12)O_6 (500 mg · L~(-1) ) , Cr~(3+) ( 10 mg · L~(-1) ), after treated with the complex process, concentrations of C_6H_(12)O_6 and Cr~(3+) are on the scale of 15-20 mg · L~(-1), and less than 1 mg · L~(-1), respectively. Purified water can meet the standards of industrial reused water.