Treatment method for synchronously removing total phosphorus and nickel in wastewater

A treatment method and technology for wastewater, applied in the fields of metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of complicated operation, difficult to implement, long process, etc., to shorten the process flow, compact and efficient process, reduce The effect of manual work

Pending Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Feng Yunxiang's invention patent "Method for Removing Total Phosphorus from Electroless Nickel Plating Wastewater Treatment", application publication number CN 102976531A, uses pH adjustment tank-anion exchange-cation exchange-collection tank-catalytic oxidation tank-pulse electrocoagulation-pH adjustment tank - Phosphorus removal is carried out in the sedimentation tank process, which is long and complicated to operate; Wu Zhiyu et al.’s invention patent "treatment system for removing phosphorus and nickel in electroless nickel plating wastewater", authorized announcement number CN 206915891U, adopts 1# regulating tank-three-dimensional electrolysis device- 1# sedimentation tank-2# regulation tank-double oxidation tank-2# sedimentation tank-3# regulation tank-ion exchange process, the process is also very long and difficult to implement

Method used

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  • Treatment method for synchronously removing total phosphorus and nickel in wastewater
  • Treatment method for synchronously removing total phosphorus and nickel in wastewater

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Embodiment 1

[0029] Such as figure 1 As shown, the present invention is a treatment method for synchronous removal of total phosphorus and nickel in wastewater, which mainly includes a sequencing batch chemical reactor, an ozone supply system, a dosing system and an automatic control system.

[0030] (1) The wastewater enters the sequencing batch chemical reactor, and the hypophosphite, phosphite and pyrophosphite in the wastewater are oxidized to orthophosphate by ozone, and the complexed nickel is broken at the same time, and then the pH value is adjusted by adding alkali After 11.0 to 11.5, add coagulants and coagulants to strengthen coagulation and sedimentation, the supernatant is discharged into the subsequent sewage treatment system, and the sediment is discharged into the sludge treatment system. Ozone oxidation and decompression, pH adjustment, enhanced coagulation reaction, precipitation, drainage and sludge discharge are all completed in the sequencing batch chemical reactor acc...

Embodiment 11

[0038] a. Take a printed circuit board chemical waste nickel cleaning wastewater as raw water, raw water quality total phosphorus = 87.000mg / L, nickel = 23.300mg / L;

[0039] b. The dosage of ozone is 0.100kgO 3 / t, the ozone oxidation time is 1.0h;

[0040] c. After adding NaOH to adjust the pH to 11.5, add PAC100mg / L and APAM0.5mg / L with a molecular weight of 9 million, react for 15min; let it settle for 1.0h;

[0041] d. Total phosphorus in the treated effluent = 0.090mg / L, nickel = 0.080mg / L.

Embodiment 12

[0043] a. Take an anodized surface treatment cleaning wastewater as raw water, raw water quality total phosphorus = 1.250mg / L, nickel = 26.660mg / L;

[0044] b. The dosage of ozone is 0.050kgO 3 / t, the ozone oxidation time is 1.0h;

[0045] c. Dosing Ca(OH) 2 After adjusting the pH to 11.5, add 100mg / L of PAC and 0.5mg / L of APAM with a molecular weight of 9 million, and react for 15min; let it settle for 1.0h;

[0046] d. Total phosphorus in the treated effluent = 0.110mg / L, nickel = 0.088mg / L.

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Abstract

The invention discloses a treatment method for synchronously removing total phosphorus and nickel in wastewater. A device used in the method mainly comprises a sequencing batch chemical reactor, an ozone supply system, a dosing system and an automatic control system. Wastewater enters the sequencing batch chemical reactor; hypophosphite radicals, phosphite radicals and pyrophosphite radicals in the wastewater are oxidized into orthophosphate radicals by utilizing ozone; meanwhile, complex nickel is subjected to complex breaking, and then alkali is added to adjust a pH value to 11.0-11.5; a coagulant, a coagulant aid and other chemical agents are added for enhanced coagulating sedimentation; a supernatant is discharged into a subsequent sewage treatment system; and sediments are dischargedinto a sludge treatment system. According to the method, the hypophosphite radicals, the phosphite radicals and the pyrophosphite radicals in the wastewater are fully oxidized into the orthophosphateradicals by utilizing ozone, complex nickel breaking is synchronously completed, and total phosphorus and nickel are synchronously and efficiently removed in the same reactor, so total phosphorus andnickel after treatment of short-process chemical nickel-plating wastewater, anodic oxidation surface treatment wastewater and mixed discharge wastewater of an electroplating industrial park stably reach discharge standards.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, and relates to a treatment method for synchronously removing total phosphorus and nickel in wastewater, which is used for efficiently removing total phosphorus and nickel in electroless nickel plating wastewater, anodic oxidation surface treatment wastewater and mixed wastewater from electroplating industrial parks. Nickel, to ensure stable and up-to-standard discharge. Background technique [0002] Electroless nickel plating is widely used in industries such as printed circuit boards, metal plating and chemical industry, which can effectively improve the corrosion resistance and wear resistance of workpieces. The main components of the electroless nickel plating solution are the reducing agent sodium hypophosphite and various organic acid complexing agents, so the electroless nickel plating waste bath solution and cleaning wastewater contain hypophosphorous acid, phosphor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/20C02F103/16
CPCC02F1/008C02F1/5236C02F1/5281C02F1/56C02F1/66C02F1/78C02F9/00C02F2001/007C02F2101/105C02F2101/20C02F2103/16C02F2209/005C02F2209/06
Inventor 罗新浩胡勇有
Owner SOUTH CHINA UNIV OF TECH
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