Product Name: PCB circuit board wastewater treatment equipment characteristics: first waste water from the pump into the pool of acid precipitation from acid precipitation acid pool PH meter control the amount of ink wastewater photosensitive film in control at 2-3 PH conditions will precipitated into a thick gel condensate, treated wastewater into the post-acidification of the slag and the reaction vessel and then transferred to an alkaline pH (pH value 8.5-9.0), while in this condition added coagulant PAC and PAM, wastewater stirring coagulation reaction occurs under formation of a large number of alum coagulation body, after precipitation, the supernatant water Suitability: Suitable for electroplating industry, PCB industry, chemical industry, food processing, power industry, textile printing printed circuit board ( Printed Circuit Board, referred to as PCB) waste in accordance with the different major pollutants generally be divided into clean water, waste ink, complex waste water, strong acid waste, waste water and other types of strong alkali waste, its ink waste mainly from the board screen printing production process, developing, stripping film processes. PCB waste ink is a high concentration of organic wastewater, which CODcr usually 5000-10000mg / L, and some can be as high as 20000mg / L, SS about 800-1200mg / L, PH value is generally alkaline wastewater color is dark blue color, such waste accounts for about 5% PCB waste total volume of water. The key terms of PCB waste water treatment, CODcr whether compliance (≤100mg / L) is the removal of high concentrations of ink wastewater organics. Engineering practice, we were using several treatment methods to deal with waste ink, through analysis and detection, to determine a more appropriate combination of technology, can effectively remove the ink wastewater CODcr. 1. Approach: printed circuit board production will use a lot of ink, the type of PCB inks can be divided according to the function and purpose of the seven: resist ink, resistant plating ink, plugging holes ink, solder resist ink (commonly known as Green oil), marking inks, conductive inks and peelable ink (commonly known as blue gum), etc. The main component of the ink is made of resin, fillers, pigments, additives and solvents and other components, commonly used in the ink without removing the NaOH solution, high concentration of organic matter in the waste water discharged ink, alkaline. Ink wastewater contains a large number of resin, easy to precipitate under acidic conditions. 2. The current domestic PCB ink wastewater treatment process are: oxidation; biological treatment; Filtration - adsorption method; acidification - coacervation method, are for the removal of ink high concentration of organic matter in the wastewater taken. ① oxidation method using oxidation process PCB waste ink, is a strong oxidation reaction. Oxidation method commonly used treatment methods are: combustion, electrolytic oxidation, chemical oxidation, photo-oxidation. Combustion method is a method of burning the high concentration organic wastewater treatment of organic wastewater treatment higher fuel value is a good way to deal with the high cost but not widely used. Electrolytic Oxidation high processing costs, equipment investment, limited degree of degradation. Photooxidation is still in the research stage. Chemical oxidation using oxidant NaClO, H2O2, O3, most organic compounds can be reduced to a certain concentration, but is not complete, the costs are high. ② biological treatment method uses biological treatment of PCB waste ink, the general contact oxidation method, but CODcr wastewater into the biological tank must be less than 1000mg / L, generally for PCB ink wastewater pretreatment or dilution by biological treatment effluent CODcr It may be less than 200mg / L. But biological treatment for an aeration, power consumption, processing costs are high, and the kind of poor biodegradability. PCB ink wastewater often contains a certain amount of heavy metals, toxic effects on organisms, greatly reducing the biological activity. In addition, the pH value of the waste water must be strictly controlled in the neutral condition. PCB waste ink itself some inherent characteristics (low ratio of BOD and COD, poor biodegradability), seriously affecting the application of biological methods. ③ filtration - filtration adsorption method - PCB ink adsorption treatment of wastewater, wastewater pretreatment after the first by the pump into the filter, the filter wastewater after treatment can remove most of the ink and the suspension was filtered effluent into the activated carbon adsorption equipment, by activated carbon adsorption, decomposition, can achieve good treatment effect. ④ acidification - coacervation acidification - condensation method is the treatment of the most common PCB ink wastewater treatment process, this process is generally the first waste water from the pump into the pool of acid precipitation, acid precipitation pool with a pH automatic control instruments, instrument control applied by the PH The amount of acid, acid precipitation pool PH control in 2-3 ink wastewater photosensitive film under acidic conditions will precipitate into a thick gel agglomerates having a specific gravity compared with water, easy to separate waste water by acidification into the slag after and the reaction vessel and then transferred to an alkaline pH (pH value 8.5-9.0), while in this condition and PAM PAC coagulant is added, the formation of a large number of body water condensate alum coagulation reaction occurs under agitation, the precipitation After the supernatant water is better. The wastewater treatment process PCB inks, CODcr removal rate was 60% -80% (ink wastewater CODcr is higher, the higher the removal), CODcr can be reduced to 1000 mg / L or less (individual water samples are different). Experimental study of the four above-mentioned ink wastewater treatment methods have advantages and disadvantages, taking into account the practical feasibility of the project, acidification - PCB ink wastewater treatment method is more appropriate cohesion.