Treating electroplating hypophosphite wastewater with dephosphorizing agent is different from the traditional dephosphorizing process. In the traditional phosphorus removal process, it is necessary to adjust the pH value of wastewater to alkaline conditions and add lime for precipitation treatment. The principle is that lime and orthophosphate combine to form precipitate, but the removal of hypophosphite needs to adjust the pH value of wastewater to acidic conditions for treatment, and hypophosphite remover can combine with hypophosphite to form precipitate under acidic conditions. The specific process is as follows:

1. Extract hypophosphite wastewater from electroless nickel plating and adjust the pH value of wastewater.

2. Adding hypophosphite remover HMC-P3 and corresponding catalyst for catalytic reaction.

3. Add hypophosphite flocculant for flocculation reaction.

4. Determine the total phosphorus in the effluent of electroless nickel plating wastewater, and the phosphorus can reach the standard.

Dosage of hypophosphite remover:

When using hypophosphite remover, the general dosage is about ten times of hypophosphite content. For the cleaning water of electroless nickel plating, the dosage of hypophosphite can be reduced to less than 0.5mg/L by ten times, and the dosage of chemicals is even less for the high content of phosphorus in electroless nickel plating solution. The relationship between the specific dosage of chemicals and the total phosphorus content is as follows: