Electrolysis recovery method of nickel in waste water

Disclosed is an electrolysis recovery method of nickel in waste water. The method includes steps of: firstly, selecting 1000-1500 parts of waste water containing nickel, using sodium hydroxide flakes to regulate PH in a range of 1-6; secondly, adding 0.01-0.05 parts of polyethylene glycol, 0.03-0.06 parts of thiourea, 0.01-0.015 parts of at least one of sodium dodecyl sulfate, chloral hydrate, para toluene sulfonamide and saccharin, maintaining a system temperature at 50-80 DEG C, controlling current to in a range of 1.0-5.0A and starting electrolysis with stirring, maintaining the PH the same as that in the first step through adding the sodium hydroxide flakes, and controlling electrolysis time in a range of 12-24 hours; and thirdly, using sodium hydroxide flakes again to regulate the PH in a range of 6-10, adding 0.15-0.3 parts of at least one of sodium monophosphate and gelatin, maintaining the system temperature continuously, controlling current to in a range of 1.0-5.0A and starting electrolysis with sti