The main
pollutants in electroless nickel plating wastewater were total nickel, total
phosphorus and COD. In this paper, we applied a combination of electrolysis,
precipitation and EF to treat the electroless nickel plating wastewater in the
purpose of resource recycle and pollutants removal. Electrolysis was applied to
treat the wastewater first. The effects of pH, current density, temperature,
circulation, electrolysis time on the recovery efficiency of nickel and the
removal efficiency of COD was studied.
As the
nickel plating of nickel sulfate concentration of nickel plating solution is
usually only one-tenth, if the recycling of rinsing water re-use, virtually no
impact on the environment. However, the chemical
nickel plating bath is always
important to the aging problem is, when the repetitive use of more than 5
cycles, due to the bath of phosphate and sulfate Central Asia, the accumulation
will be significant impact on the quality of coating. Then the general aging of
the bath containing 3
-5g / l of
nickel, if directly mixed with rinse water, will undoubtedly impact on the
environment, increase the rinse water treatment difficult.
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