Equipment for treating wastewater with hypophosphite and phosphite

Abstract

The invention discloses equipment for treating wastewater with hypophosphite and phosphate. The equipment consists of a mixing reaction system and a precipitation system, wherein the mixing reaction system is used for feeding a Fenton chemical and a coagulant, used for oxidizing hypophosphite and phosphate pollutants and used for generating calcium orthophosphate suspended solids which can be conveniently precipitated and removed later, and is composed of a first Fenton reaction tank, a second Fenton reaction tank, a coagu-flocculation reaction tank, a flocculation reaction tank and folding plates; the precipitation system is used for separating the calcium orthophosphate suspended solids through gravity, used for removing total phosphorus pollutants, used for backflowing a part of sludgeto the first Fenton reaction tank and is composed of a settling tank and a sludge backflow pump; the folding plates (7) are respectively arranged inside the first Fenton reaction tank (1), the secondFenton reaction tank (2), the coagu-flocculation reaction tank (3) and the flocculation reaction tank (4).

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to equipment for treating wastewater containing hypophosphite and phosphite. Background technique [0002] Hypophosphite is used in the electroless nickel plating process, so the cleaning wastewater after electroless nickel plating contains a certain amount of hypophosphorous acid and phosphite. Because hypophosphorous acid and phosphite are not easy to be precipitated and removed, the traditional wastewater treatment process uses the Fenton oxidation process, which utilizes the strong oxidation of OH generated by the Fenton reaction to oxidize hypophosphorous acid and phosphite into orthophosphate, and then Lime and orthophosphate are used to react to form calcium orthophosphate precipitation to remove. [0003] The traditional Fenton oxidation process needs to add a large amount of ferrous sulfate, sulfuric acid, and hydrogen peroxide to generate sufficient strong ...

AI Technical Summary

Problems solved by technology

The added ferrous sulfate and lime eventually turn into sedimentation sludge, so the system produces a large amount of sludge

Moreover, the structure of the reaction tank is mostly an ordinary gas stirring and mixing reaction tank, and the mixing effect of the chemical is poor, thereby further increasing the consumption of the chemical and the amount of sludge generated.

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