Nickel-containing wastewater treatment method and equipment

Abstract

The invention discloses a nickel-containing wastewater treatment method, comprising the following steps: collecting nickel-containing wastewater, and pumping the nickel-containing wastewater into a complex breaking oxidation pool; adding sulfuric acid into the complex breaking oxidation pool until the pH value in the complex breaking oxidation pool is 2.0-2.5; adding ferrous sulfate and hydrogen peroxide into the complex breaking oxidation pool to break a nickel complex to enable the nickel complex to form free nickel; conveying the treated wastewater into a primary reaction sedimentation tank; adding lime into the primary reaction sedimentation tank until the pH value in the primary reaction sedimentation tank is 10.0-10.5; adding a coagulant into the primary reaction sedimentation tank to generate coagulating sedimentation; conveying the treated wastewater into a secondary reaction tank; adding drift ice into a secondary reaction sedimentation tank to remove residual cyanides and other organic complexes in the wastewater by oxidization, regulating the pH value in the secondary reaction sedimentation tank to 10.0-10.5, and precipitating; pumping the wastewater treated in the secondary reaction sedimentation tank into a filtering system; filtering a small amount of mud and a part of suspended solids in the wastewater via the filtering system.

Description

technical field [0001] The invention relates to wastewater treatment technology, in particular to a nickel-containing wastewater treatment method and equipment. Background technique [0002] In the production process of the circuit board, due to the requirements of high precision and compactness, the more layers of the circuit board and the thinner the total thickness of the circuit board, the metal nickel is usually used as the intermediate layer between gold and copper in the prior art. Therefore, nickel is used in the immersion gold and gold plating processes in the circuit board manufacturing process, resulting in nickel-containing wastewater. However, since nickel is a type of pollutant, its discharge standard is more stringent than that of other heavy metals. Therefore, there is an urgent need for a nickel-containing wastewater treatment method with better treatment effect to facilitate the production of circuit board manufacturers and other manufacturers. The nickel-...

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Problems solved by technology

[0002] In the production process of the circuit board, due to the requirements of high precision and compactness, the more layers of the circuit board and the thinner the total thickness of the circuit board, the metal nickel is usually used as the intermediate layer between gold and copper in the prior art. Therefore, nickel is used in the immersion gold and gold plating processes in the circuit board manufacturing process, resulting in nickel-containing wastewater

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