The waste water treatment method in PCB production of PCB manufacturers
The waste water treatment method in PCB production of PCB manufacturersPCB manufacturers in the production process of grinding board, etching, electroplating, Hole metallization, development, striping and other processes will produce waste water. PCB wastewater mainly includes the following types,
a, The complex copper-containing wastewater produced by chemical immersion copper and etching process, the PH value of this kind in 9~10, cu2+ concentration can reach 100~200mg/L.
b, Plating, grinding, the cleaning process before brushing produce a large number of acidic heavy metal wastewater (not complexing copper wastewater), containing SN/PB wastewater, ph value in 3~4, cu2+ less than 100mg/L, sn2+ less than 10mg/L and trace of pb2+ and other heavy metals.
c, Dry film, film, development, deinking, screen cleaning and other processes produce a higher concentration of organic ink waste, COD concentration in general is 3000~4000mg/L.
According to the different characteristics of PCB wastewater, it is necessary to shunt different wastewater and adopt different methods to deal with it.
1.Complex copper-containing wastewater (copper-ammonia complexation wastewater)
In this kind of waste water, heavy metal cu2+ and ammonia form a more stable complex, which must destroy the complex structure before coagulation and sedimentation. In general, use vulcanization method to treat, the vulcanization method refers to the S2-in sulfide and and CU2+ in copper-ammonia complex ions form CuS precipitation, so that Separating the copper from the waste water, and excessive S2--with ferric salts to make it produce FES precipitation to remove.
Processing process flow is as follows,
Copper ammonia complexing wastewater → regulating pool → breaking reaction pool → coagulation reaction pool → inclined tube sedimentation tank → Intermediate pool → filter →ph callback pool → Discharge
2. Ink Waste water
The waste water of striping and deinking is small, in general use intermittent treatment, utilize organic ink in the acidic conditions, can be separated from the waste water to produce suspended substance to remove, after pretreatment of the ink wastewater, can be mixed into the comprehensive waste water for follow-up treatment, if water flow is high can be used alone biochemical method to deal with
The processing process is as follows,
Organic ink wastewater → acidification slag pool → discharged into the comprehensive wastewater pool or biochemical treatment
3. PCB Integrated Wastewater
This kind of wastewater mainly includes the synthetic wastewater containing acid and alkali, cu2+, sn2+, pb2+ and other heavy metals, and the treatment method is the same as that of electroplating synthetic wastewater, which is treated by the coagulation and sedimentation method of hydrogen peroxide.
4. Comprehensive treatment of various PCB wastewater
When containing the above several PCB wastewater, the copper ammonia complex wastewater, ink waste water, comprehensive heavy metal waste water, it should be shunt collected. After printing ink wastewater pretreatment, mixed with the integrated wastewater for subsequent treatment, after separately deal with the copper ammonia complex wastewater into the integrated wastewater treatment system.
The processing process is as follows,
Copper ammonia complexation wastewater → regulating pool → breaking reaction pool → coagulation reaction pool → inclined tube sedimentation tank → intermediate pool
Organic ink wastewater → acidification slag pool → discharged into comprehensive wastewater pool
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