Abstract: A complex process of micro electrolysis and biofilm was developed to continuously treat
organic wastewaters containing heavy metal ions such as Cu2+ and Cr3+, 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 (Cu2+, Cr3+), part was removed 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 C6H12O6 (glucose)
biodegradation by cultured microbes or acclimated microbes were also obtained. These
experimental results indicated that for wastewater initially consisted of C6H12O6 (500mg.
L-1), Cu2+ and Cr3+ (10mg. L-1), after treatment, its concentrations of C6H12O6, Cu2+ and
Cr3+ were lowered to the level of 55-65 mg.L-1, and less than 1 mg.L-1, respectively. And
the industrial reused water standards could be met by treated wastewater.

Key words: electrodeposition, biofilm, heavy metal ions, organic materials, biodegradation

摘要： A complex process of micro electrolysis and biofilm was developed to continuously treat
organic wastewaters containing heavy metal ions such as Cu2+ and Cr3+, 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 (Cu2+, Cr3+), part was removed 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 C6H12O6 (glucose)
biodegradation by cultured microbes or acclimated microbes were also obtained. These
experimental results indicated that for wastewater initially consisted of C6H12O6 (500mg.
L-1), Cu2+ and Cr3+ (10mg. L-1), after treatment, its concentrations of C6H12O6, Cu2+ and
Cr3+ were lowered to the level of 55-65 mg.L-1, and less than 1 mg.L-1, respectively. And
the industrial reused water standards could be met by treated wastewater.

关键词: electrodeposition;biofilm;heavy metal ions;organic materials;biodegradation