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Flexible Pcb Circuit Board Wastewater Treatment
Jul 13, 2017

  flexible pcb circuit board wastewater treatment

  Circuit board in the production and processing process, will produce a lot of waste water, the impact of these wastewater on the environment is very large, so can not casually put the flexible pcb circuit board waste discharge, need to go through a specific operation after the standard can be discharged Go out. flexible pcb circuit board waste water can be divided into many kinds, mainly based on the production process of different processes and classification. In the general case, the main source of waste water containing copper ions is the cleaning procedure and the waste discharge. Commonly used in the circuit board waste water containing copper ions, water, high concentrations of organic wastewater, etc., then how do we deal with these waste water?

  1. Clean the wastewater treatment methods:

  The main source of cleaning of the circuit board is produced during the process of plating, grinding and other related processes in the process of making the circuit board. This ratio of waste water is relatively high, reaching more than 80% of the total waste water, Cleaning the waste water in the PH is acidic, the pollution of water quality is not how strict, not serious but does not mean that can be discharged, we can add the alkali solution to the ph value of the debugging, until the standard, and then into the mixed Condensate pool and coagulation pool. After adding coagulant and coagulant, the heavy metal ions in the waste water will form colloidal bodies in the form of colloidal organic matter and flow into the sedimentation tank for mud separation. And then the sludge discharged into the physical sludge pond, the sedimentation tank of the effluent into the pool and adjust the pH, the sand filter and activated carbon pool into the pool after the re-use.

  2. Contains copper ion wastewater treatment methods:

  The reason for the generation of copper ion wastewater is as long as the production of the waste water in the circuit board production process is about 8%, even if it is low, flexible pcb but in the waste water The content of heavy metals is relatively large, so the pollution is relatively large, we can use a certain way to get rid of complexes (copper chelate) in order to remove copper precipitation, the stability of this conjugate is mainly The pH of the solution is related to Cu (OH) 2 at pH 2.9-12, and Cu (OH) 2 can not be removed by adjusting the pH to produce Cu (OH) 2: precipitate. However, CuS is more stable than organic complex copper ions, and CuS precipitates can be produced by adding Na2S, which can destroy the balance of complex copper ions and achieve the purpose of removing copper ions. Finally add the polymer coagulant for mud separation. However, in order to precipitate the copper in the complex completely, it is necessary to add an excess of sodium sulfide. How to control sodium sulfide is a very critical factor. On the one hand, sulfur ions on the back of the biochemical treatment of microbial culture have a certain toxic effect, on the other hand, sulfur ions is one of the indicators of water.

  3. High concentration of organic wastewater treatment methods:

  The main source of high concentration of wastewater is in the circuit board degreasing, green oil, in addition to plastic and other related processes generated during the process, its concentration of organic matter is very high, in general circumstances can reach 3000-8000mg / L, this waste water is a highly polluted wastewater, so we need to separate it out. First of all, we need to put high concentrations of waste water, flexible pcb through the oil residue pool to remove oil and other impurities and other related operations, we need to waste water into the regulation pool to adjust the water quality, and then by the waste water pump into the acid pool , By the pH of the instrument to control the addition of acidic, in the acidic conditions, the organic matter in the waste water was precipitated under the surface of the acid, this time we only need to clean the surface impurities, acid precipitation after the alkali to adjust the pH, and then Dosing coagulant, the reaction and then use the pneumatic diaphragm pump into the box filter for slag separation. At this point, the waste water in the ink and suspended solids retained in the box filter, the filtrate discharge, for further processing