System for purifying and recycling electroplating/chemical plating wastewater on line

An electroless plating and wastewater technology, which is applied in metallurgical wastewater treatment, dispersed particle separation, separation methods, etc., can solve problems such as wastewater treatment that is difficult to meet in practice, and achieve the effects of reducing burden, optimizing application parameters, and simplifying steps

Active Publication Date: 2012-05-02
TANTZ ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these patents only describe qualitatively the structure of the CDI devices involved in them, but they should have many important parameters for the CDI devices to fully exert their functions, such as electrode pair area, electrode spacing

Method used

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  • System for purifying and recycling electroplating/chemical plating wastewater on line
  • System for purifying and recycling electroplating/chemical plating wastewater on line
  • System for purifying and recycling electroplating/chemical plating wastewater on line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Plate capacitive deionization device:

[0034]Activated carbon fibers are selected as the electrode material for ion electrosorption, with a thickness of 3 mm and a specific surface area of ​​1100 square meters per gram; expanded graphite plates with a thickness of 1 mm are used as collectors.

[0035] Cut 10 pieces of activated carbon fibers of 50 cm x 50 cm, and cut 10 pieces of graphite plates of 50 cm x 50 cm. The area of ​​each electrode layer is 2500 square centimeters, and the distance between electrode pairs is 0.5 cm.

[0036] Assemble the CDI device electrode group consisting of 5 electrode pairs. The assembly sequence of the components is: the lower compression plate, and 5 sets of graphite plate-activated carbon fiber-insulated porous separator-activated carbon fiber-graphite plate are arranged in the middle. The space is separated by a support plate, and finally the upper compression plate is installed.

Embodiment 2

[0038] Roll type capacitive deionization device:

[0039] Activated carbon fiber is selected as the ion electroadsorption electrode material, with a thickness of 3 mm and a specific surface area of ​​1100 square meters per gram. A 1 mm thick expanded graphite plate was used as the collector.

[0040] Cutting Cut out 2 pieces of activated carbon fibers of 50 cm x 100 cm, and cut 2 pieces of graphite plates of 50 cm x 100 cm.

[0041] Lay up the strip-shaped graphite plate, activated carbon fiber, insulating porous separator, activated carbon fiber, graphite plate, and polyethylene plastic film in sequence, leaving one end of the graphite plate higher than the activated carbon fiber as a conductive ear. Then roll it tightly to form a cylinder with an appropriate diameter, install it in a cylindrical container and seal it, leaving the conductive ear of the graphite plate, and the liquid enters at one end and exits at the other end.

Embodiment 3

[0043] The plate-type CDI apparatus of Example 1 was used to place in a water washing apparatus with a capacity of 100 liters, and a parallel electrosorption test was performed on the nickel-plating washing water.

[0044] The metal ion content in the nickel-plating washing water is 300ppm, the COD value is 1100, and the water inlet flow rate is 4 liters / minute. Assuming that the concentration of nickel ions in the effluent reaches 100ppm, the results of the treatment capacity of electroplating water per square meter of electrode pairs at operating voltages of 2, 10, and 20 volts are listed in Table 1. The concentration of metal ions and COD in the effluent were detected by atomic absorption spectrometry and potassium dichromate oxidation method, respectively.

[0045] Table 1: Effect of CDI device on purified washing water under different operating voltages

[0046]

[0047] It can be seen from the data in Table 1 that when other technical parameters remain unchanged, the...

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Abstract

The invention belongs to the technical field of water treatment, and relates to a system for purifying and recycling electroplating/chemical plating wastewater on line. The system comprises a washing device positioned on an electroplating/chemical plating production line, wherein a purifying device is arranged in the washing device and is a capacitive deionization device; the capacitive deionization device comprises at least one electrode pair consisting of ion electroadsorption electrodes, collector electrodes and an insulating layer; two ion electroadsorption electrode layers covers the outer layer of the insulating layer in the electrode pair, and then two collector electrode layers covers the outer layer of the ion electroadsorption electrode layers; and one side of the insulating layer is an anode, and the other side of the insulating layer is a cathode. By combining the characteristics of the electroplating/chemical plating wastewater and the specific conditions of the process flow, a wastewater treatment and recovery system which is suitable to be practically applied to the field is arranged, so that various application parameters are optimized, and the wastewater amount isobviously reduced; meanwhile, the quality of plated parts is ensured and water resources are effectively saved; and in addition, the on-line recovery of waste materials is realized and resources are effectively utilized.

Description

technical field [0001] The invention belongs to the technical field of water treatment, relates to electrochemistry and water treatment technology, in particular to a system for on-line purification and reuse of electroplating and electroless plating wastewater. Background technique [0002] With the rapid growth of the global population and the rapid development of industrial and agricultural production, fresh water resources are increasingly scarce, and water pollution caused by industrial, agricultural and domestic wastewater discharge is also becoming more and more serious. Water pollution not only reduces its use function, further exacerbates the contradiction of water shortage, but also seriously threatens the safety and health of human drinking water. Therefore, various processes and technologies aimed at solving the shortage of water resources are continuously introduced, among which the reuse of wastewater is an effective way to solve the shortage of water resources...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F103/16
Inventor 路勇吴小明刘宏
Owner TANTZ ENVIRONMENTAL TECH
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