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          How to deal with the circuit board wastewater?
          Scan: Date:2018-06-12
          In the process of production and processing, the circuit board factory will generate a large amount of waste water. The impact of these waste waters on the environment is very large. Therefore, the waste water of the circuit board cannot be discharged indiscriminately, and it is necessary to pass the specified operation and reach the target before discharge. go with. Especially after the 18th National Congress of the Communist Party of China, the country’s requirements for environmental protection are getting higher and higher, so we must pay more attention to the treatment of waste water.

          Wastewater from circuit boards can be divided into many types, which are mainly classified according to different processes in the production process. The main source of wastewater containing copper ions in general conditions is the cleaning process and waste discharge. The common waste water in the circuit board factory mainly contains copper ions, clean water, high-concentration organic waste water, etc. How do we treat these waste waters? Xiao Bian to tell you!

          1. Cleaning wastewater treatment methods:
          The main source of cleaning water for circuit boards is generated during the process of plating, grinding, and other related processes in the process of circuit board production. This waste water occupies a relatively high ratio, reaching more than 80% of the total waste water. The cleaned wastewater is acidic at pH. The pollution to water quality is not very strict. It is not serious, but it does not mean that it can be discharged. We can adjust the ph value by adding alkaline solution, until it reaches the standard, and then flow into the mixture. Condensate and coagulation tanks. After adding the coagulant and coagulant aid, the heavy metal ions in the waste water will form a floc shape on the surface of the colloidal organic matter and flow into the sedimentation tank for sludge separation. Sludge is then discharged into the materialized sludge tank, and the effluent of the sedimentation tank flows into the neutralization tank to adjust the pH, and then flows into the reused pool through the sand filter and the activated carbon pool to be used again.

          2. Copper-containing wastewater treatment methods:
          The reason why copper-containing wastewater is generated is as long as the relevant production processes such as circuit boards are etched and copper sinks, and this waste water accounts for about 8% of the total production process of the circuit board, even if it is low, but in the waste water The content of heavy metals is relatively large, so the pollution is also relatively large. We can use certain methods to destroy complexes (copper chelates) to remove copper precipitates. The stability of this combination is mainly related to The ph value of the solution is related. When the pH is 2.9-12, the complexed copper ion is more stable than Cu(OH)2. Therefore, the copper ion cannot be removed by adjusting the pH to produce Cu(OH)2:precipitation. However, CuS is more stable than organic complex copper ions, and CuS precipitation can be produced by adding Na2S, thereby destroying the balance of complexed copper ions and achieving the purpose of removing copper ions. Finally, a polymer coagulant was added to separate the slurry. However, to completely precipitate the copper in the complex, an excess of sodium sulfide must be added. How to control sodium sulfide is a very critical factor. On the one hand, sulfur ions have a certain toxic effect on the cultivation of microorganisms in the subsequent biochemical treatment. On the other hand, sulfur ions are also one of the control indicators of effluent.

          3. High-concentration organic wastewater treatment method:
          The main source of high-concentration wastewater is generated during the related processes such as degreasing, green oil, and degumming of circuit boards. Its organic concentration is very high, and can reach 3000-8000 mg under normal circumstances. /l, this waste water is a highly polluted waste water, so we need to separate it out. First, we need to collect high-concentration waste water. After related operations such as removing grease from the oil-sludge sedimentation tank, we need to put the waste water and waste water into the conditioning tank to adjust the water quality, and then pump it into the acidification pool by the waste water pump. The acidity is controlled by the pH on-line instrument. Under acidic conditions, the organic substances in the waste water are precipitated on the surface under acidic conditions. At this time, we only need to clean the impurities on the lower surface. After the acidification, add the alkali to adjust the pH, and then cast. Add coagulant, after the reaction, use a pneumatic diaphragm pump to enter the chamber filter press for slag water separation. At this point, the ink and suspended matter in the waste water are trapped in the chamber filter press, and the filtrate is discharged for further processing.
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