Purification of Organic Wastewater Containing Cu~(2+) and Cr~(3+) by a Combined Process of Micro Electrolysis and Biofilm

摘要

A complex process of micro electrolysis and biofilm was developed to continuously treat organic wastew-aters containing heavy metal ions such as Cu~(2+) and Cr~(3+), and the relevant purifying mechanism was also addressed. In detail, organic materials in wastewater could be consumed as nutritious source by biofilm composed of aerobes and anaerobes. However, for heavy metal ions (Cu~(2+), Cr~(3+), part was removec, by electrodeposition, and some was adsorbed on biofilm. In order to compare with the combined process of micro electrolysis and biofilm, the experimental data of micro electrolysis process (intermittent) or biofilm process (continuous) were provided, and the kinetic data of CeH Oe (glucose) biodegradation by cultured microbes or acclimated microbes were also obtained. These experimental results indicated that for wastewater initially consisted of C_6H_(12)O_6 (500mg·L~(-1)), Cu~(2+) and Cr~(3+) (10mg·L~(-1)), after treatment, its concentrations of C_6H_(12)O_6, Cu~(2+) and Cr~(3+) were lowered to the level of 55―65mg·L~(-1), and less than 1mg·L~(-1), respectively. And the industrial reused water standards could be met by treated wastewater.