Online resourceful treatment method of electroless copper plating waste solution

An online resourceful treatment method of electroless copper plating waste solution, comprising the following steps:

• (1) autocatalytic reduction reaction:
• filtering the electroless copper plating waste fluid to remove solid impurities, then introducing the waste fluid into an autocatalytic reactor, adjusting pH to 13-14, controlling temperature to 60-70° C., adding a copper-based catalyst at a dosage of 2-10 g/L, wherein the copper-based catalyst comprises by percentage of weight:
• 20-26% of nano-copper, 0.1-0.5% of cerium oxide, 2.5-4.5% of carbon black, and the balance of nano cuprous oxide, after the copper-based catalyst is added, mixing the electroless copper plating waste fluid with the copper-based catalyst by stirring at a frequency of 100-150 KHz and an electromagnetic field intensity of 6,000-7,000 K/Am, and carrying out an autocatalytic reduction reaction to reduce copper ions in the electroless copper plating waste fluid into copper elementary substances for precipitation, filtering to recycle the copper elementary substances, returning the recycled electroless copper plating waste fluid to the autocatalytic reactor, and then stopping the autocatalytic reduction reaction until the concentration of copper ions in the electroless copper plating waste fluid is lower than a threshold;
• (2) treatment of the electroless copper plating waste fluid by a three-dimensional electrolysis method:
• adjusting the pH of the electroless copper plating waste fluid obtained after the autocatalytic reaction of the step (1) to 6.0-6.5 with an acidic solution, and then introducing the electroless copper plating waste fluid after the pH adjustment into a three-dimensional electrolysis device containing a particle electrode for advanced oxidation treatment of COD, ammonia nitrogen and organic substances in the waste fluid in an electrolysis manner, wherein the particle electrode is a polyacetylene/activated carbon composite particle with a particle diameter of 2 mm, and the dosage of the particle electrode is 12-15 g/L, and the three-dimensional electrolysis device has an electrolysis current controlled at 0.6-0.7 A and an electrolysis time controlled between 2-3 h;
• (3) chemical precipitation:
• adjusting the pH of the waste fluid after the advanced oxidation treatment of the step (2) with a NaOH solution to 7-7.5, introducing the waste fluid into a chemical precipitation device, adding a precipitant at a dosage of 4-10 mg/L to coagulate impurities in the waste fluid, and filtering to obtain a supernatant;
• and
• (4) purification treatment:
• subjecting the supernatant obtained in step (3) to membrane separation by a membrane filtration apparatus, discharging the separated clean water, and returning a separated concentrated solution containing residual copper ions to the autocatalytic reactor of step (1) for re-treatment.