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Resourceful treatment and recycling method of circuit board wastewater

A circuit board and recycling technology, which is applied in the field of circuit board wastewater recycling, can solve the problems that cannot be fully realized, and achieve the effects of simple process, weakened poisonous effect, and low operating cost

Inactive Publication Date: 2016-08-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the characteristics of catalytic internal electrolysis treatment, this method is often used in the pretreatment stage of wastewater. With further research on this method, catalytic internal electrolysis cannot fully realize the advantages of this method as a single technology.

Method used

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  • Resourceful treatment and recycling method of circuit board wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Taken from the waste water of a comprehensive pool of a circuit board factory (total copper = 180-200mg / L, total nickel = 0.9-1.5mg / L, COD Cr =450~550mg / L, ammonia nitrogen=35~45mg / L, total nitrogen=65~75mg / L, total phosphorus=3.8~4.5mg / L), press figure 1 process as shown.

[0039] First, adjust the pH of wastewater from a comprehensive pool of a circuit board factory to 3 to 4, pump it into the copper-breaking reactor with a metering pump, add Pall ring fillers to the reactor according to the effective volume of the reactor at 0.1kg / L, and react There is an aerator at the bottom of the tank for aeration to control the concentration of dissolved oxygen in the water to 2.5-4.0mg / L, and the residence time is 1h;

[0040] Add 10% sodium hydroxide solution to the effluent of the copper removal reactor to adjust the pH=8~9, then add commercially available anionic flocculant polyacrylamide (PAM), the dosage of PAM is 0.5mg / L, stir After 10 minutes of coagulation reaction (r...

Embodiment 2

[0046] Taken from the waste water of a comprehensive pool of a circuit board factory (total copper = 180-200mg / L, total nickel = 0.9-1.5mg / L, COD Cr =450~550mg / L, ammonia nitrogen=35~45mg / L, total nitrogen=65~75mg / L, total phosphorus=3.8~4.5mg / L), press figure 1 process as shown.

[0047] First, adjust the pH of wastewater from a comprehensive pool of a circuit board factory to 3 to 4, pump it into the decomplexation and copper removal reactor with a metering pump, and add Pall ring fillers to the reactor according to the effective volume of the reactor at 0.05kg / L, and react There is an aerator at the bottom of the device for aeration, and the dissolved oxygen concentration in the water is controlled to 2.5-4.0mg / L, and the residence time is 1.5h;

[0048] Add 10% sodium hydroxide solution to the effluent of the copper removal reactor to adjust the pH=8~9, then add commercially available anionic flocculant polyacrylamide (PAM), the dosage of PAM is 0.8mg / L, stir After 20 mi...

Embodiment 3

[0057] Taken from the waste water of a comprehensive pool of a circuit board factory (total copper = 180-200mg / L, total nickel = 0.9-1.5mg / L, COD Cr =450~550mg / L, ammonia nitrogen=35~45mg / L, total nitrogen=65~75mg / L, total phosphorus=3.8~4.5mg / L), press figure 1 process as shown.

[0058] First, adjust the pH of the waste water from a comprehensive pool of a circuit board factory to 3~4, pump it into the copper removal reactor with a metering pump, add Pall ring fillers to the reactor according to the effective volume of the reactor of 0.15kg / L, and react There is an aerator at the bottom of the device for aeration, and the dissolved oxygen concentration in the water is controlled to 2.5-4.0mg / L, and the residence time is 0.5h;

[0059] Add 10% sodium hydroxide solution to the effluent of the copper removal reactor to adjust the pH=8~9, then add commercially available anionic flocculant polyacrylamide (PAM), the dosage of PAM is 0.3mg / L, stir After 10 minutes of coagulation ...

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Abstract

The invention relates to a resourceful treatment and recycling method of circuit board wastewater. The resourceful treatment and recycling method comprises the following steps of 1, precipitation breaking and copper removal, wherein pH of the circuit board wastewater is adjusted to 2-4, the circuit board wastewater is put into a precipitation breaking and copper removal reactor filled with ferric carbon filler, an aeration reaction is performed, the pH of outlet water of the reactor is adjusted, a flocculating agent is added, a stirring coagulating reaction is performed, and solid-liquid separation is performed; 2, cyanide breaking and nickel removal, wherein the pH of a supernate obtained in the step 1 is adjusted to 2-4, the supernate is put into a cyanide breaking and nickel removal reactor, and an aeration reaction is performed, the pH of outlet water of the reactor is adjusted to 8-9, a stirring coagulating reaction is performed, and solid liquid separation is performed; 3, filter material biological filter pond treatment, wherein the supernate obtained in the step 2 is added into a filter material biochemical treatment system with a cyanide breaking and nickel removal filter material, cyanide breaking and nickel removal are performed, and the final outlet water is obtained. Compared with the prior art, the method is simple in flow, compact, stable, efficient, low in operation cost, applicable to wastewater with the high heavy metal concentration and particularly suitable for circuit board wastewater treatment, and has the high popularization and application value.

Description

technical field [0001] The present invention relates to the field of advanced treatment of industrial wastewater, in particular to a method for resourceful treatment and recycling of circuit board wastewater by coupling two-stage novel filter material biofilter for copper and nickel removal by breaking the network, especially for copper and nickel treatment. A method for recycling circuit board waste water with high heavy metal content. Background technique [0002] Printed circuit board (PCB) wastewater is a large amount of wastewater containing heavy metals and organic wastewater generated during the process of printing circuit boards. The wastewater has many types of pollutants, complex components, difficult treatment, and high treatment costs. In the production process of printed circuit boards, copper ions are contained in the wastewater discharged from grinding boards, weak corrosion, copper electroplating and other processes; copper ions and complexing agents EDTA and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/20C02F101/30C02F101/16
CPCC02F1/46176C02F1/463C02F1/56C02F1/66C02F1/725C02F3/302C02F3/308C02F9/00C02F2101/105C02F2101/16C02F2101/20C02F2101/30C02F2301/046C02F2301/08
Inventor 潘碌亭董恒杰
Owner TONGJI UNIV
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