| dc.description.abstract | The objective of this thesis is to discuss how to use the surplus alkali and acid waste liquid from preprocedure of copper wastewater output by printed circuit board(PCB).The result of the thesis obtained by the JAR TEST is referenced. There is a lot of impurities in the surplus acid waste liquid and the reported and discoved with alkali waste liquid, due to which, the unwell-mixed mixture easily leads to a deviation of JAR TEST result. The efficiency of the floc has direct proportion with the COD(mg/L). Although some amount of CuO exists in the recycled waste alkali, Cu2+ doesn’t destroy the efficiency of the floc.
The surplus waste alkali liquid and the waste acid liquid from the main recycling procedure of etching wastewater can be used for adjust pH and save the amount of H2SO4 or NaOH. However the large quantity of the sludge is a problem. Another problem of the recycling of wastewater is the increase of the effluent COD(mg/L). Upon, recycling the waste alkali liquid, the raw water must have a pH of above 9.0 to get better water.
The factories that generate a large amount of wastewater do not worry about the problem of the higher number of COD and sludge. On the other hand they really care about the financial effect of less using H2SO4 and NaOH. The factories without emitting the Cu2+ wastewater must observe the quality of the effluent because they use the waste acid liquid and the waste alkali liquid from the recycling procedure to blend the wastewater pH value. Preventing the system will observe the effluent which is not from production procedure. Because the waste acid liquid and the waste alkali liquid always has 1,000 mg/L to 2,000 mg/L Cu2+. As a result, during the prebention, the maximum use of the waste acid liquid and the waste alkali liquid must be considered.
Keyword ：printed circuit board, chemical coagulation, the waste acid liquid , the waste alkali liquid, etching wastewater, micro etching wastewater
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