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Membrane treatment process for heavy metal waste water generated during PCB production process

A production process, heavy metal technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc., can solve problems affecting production efficiency, ion exchange resin regeneration difficulties, etc. Achieve the effects of preventing the transfer of pollution, optimistic development prospects, and high treatment efficiency

Inactive Publication Date: 2012-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, the ion exchange resin is difficult to regenerate and needs to be replaced frequently, which affects production efficiency

Method used

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  • Membrane treatment process for heavy metal waste water generated during PCB production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The general pickling wastewater generated in the PCB production process passes through the filter bag pretreatment system after flocculation and precipitation, and the filtrate (300 liters) enters the roll-type nanofiltration system with a membrane pore size greater than 1nm. The operating temperature of the nanofiltration system is controlled at 30°C and the pressure 1.25MPa; the concentrate (30L) passes through a reverse osmosis membrane system with a pore size of 0.2nm at a temperature of 40°C and a pressure of 2.0MPa to finally obtain a concentrate (5L), in which the concentration of copper ions reaches 3g / L, can enter the electrolysis process; obtain the nanofiltration permeate (270 liters), which is similar to the composition of the comprehensive wastewater, so it can be mixed with the comprehensive wastewater to enter the nanofiltration system. The operating temperature of the nanofiltration system is 30 ° C and the pressure is 3.0 MPa.

Embodiment 2

[0028] The general pickling wastewater generated in the PCB production process passes through the filter bag pretreatment system after flocculation and precipitation, and the filtrate (300 liters) enters the roll-type nanofiltration system with a membrane pore size greater than 1nm. The operating temperature of the nanofiltration system is controlled at 35°C and the pressure The concentrated solution (60L) passes through a reverse osmosis membrane system with a pore size of 0.2nm at a temperature of 40°C and a pressure of 2.0MPa. Finally, the concentrated solution (6 liters) is obtained, in which the nickel ion concentration is about 1g / L, which can enter the electrolysis process; the nanofiltration permeate (240 liters) is obtained, which is similar to the composition of the comprehensive wastewater, so it can be mixed with the comprehensive wastewater into the nanofiltration system. The operating temperature of the nanofiltration system is 35°C and the pressure is 2.5MPa.

Embodiment 3

[0030] The comprehensive wastewater generated in the PCB production process passes through the filter bag pretreatment system after flocculation and precipitation, and the filtrate (300 liters) rises into the roll-type nanofiltration system with a membrane pore size greater than 1nm. The temperature of the nanofiltration system is controlled at 20°C and the operating pressure is 1.25MPa. Finally, 270L permeate and 30L concentrate are obtained. The concentrate can enter the reverse osmosis treatment process of general pickling wastewater, and the permeate can meet the national discharge standard and can be discharged directly.

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Abstract

The present invention discloses a membrane treatment process for heavy metal waste water generated during a printed circuit board (PCB) production process. According to the present invention, firstly large granular suspended matters are removed from acidic heavy metal waste water containing copper, lead, chromium, cadmium, nickel and the like by a filtration bag, wherein the acidic heavy metal waste water containing the copper, the lead, the chromium, the cadmium, the nickel and the like is generated during the PCB production process; then a nano-filtration system is adopted to realize pre-concentration; finally a reverse osmosis system is adopted to deep concentrate and recover the heavy metal ions in the waste water, wherein the resulting concentrated solution can be adopted for electrolysis, the resulting dialysis solution and the comprehensive waste water pass through the nano-filtration membrane, such that the processed dialysis solution can meet the discharge standard. The process of the present invention has advantages of low resource consumption, less environmental pollution, good economic benefits and the like.

Description

technical field [0001] The invention relates to a method for treating waste water produced in the production process of printed circuit boards, especially for heavy metal waste water containing copper, lead, chromium, cadmium, nickel, etc. produced in the production process of printed circuit boards (PCB). Approach. Background technique [0002] With the improvement of our country's modernization level, the demand for electronic products is increasing, and most of the high-tech electronic components rely on printed circuit boards, so a large number of printed circuit boards are produced every day, which will inevitably produce a large number of Heavy metal wastewater. The process of electroplating copper will be involved many times in the PCB production process, and the plated plate is easily oxidized. Before the next step of treatment, it needs to be pickled with hydrochloric acid and hydrogen peroxide to remove the oxide layer, so a large amount of pickling wastewater wil...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/44C02F1/52
Inventor 刘久清刘海翔
Owner CENT SOUTH UNIV
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