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신정엽,이수구 서울産業大學校 1997 논문집 Vol.46 No.1
This investigation was carried out to develop the pretreatment process for the biological treatment of paper wastewater containing urea formaldehyde resin which is refractory material and can cause the high effluent COD concentration. The urea formaldehyde in the paper wastewater could be precipitated and coagulated and finally settled as the white coagulated hard floc on the condition of alkali over pH 8. The optimum pH was found at pH 10 as same as before in the synthetic urea resin wastewater. With the control of pH 10, the proper coagulating polymer was the anionic polymer which optimum dosage was found in the range of 3-5ppm. This chemical pretreatment for the paper wastewater could increase the COD removal efficiency up to 55%. In the combination of coagulation and biological treatment process, COD removal efficiency could be increased up to 88%, whereas the efficiencies were 62% and 74% without pH control for the raw wastewater and flotation-treated wastewater, respectively.
이수구,신정엽 서울産業大學校 1997 논문집 Vol.45 No.1
This study was performed to develop the pretreatment process for the paper wastewater, containing urea-formaldehyde resin which can cause the high effluent COD concentration. This urea resin could be removed by pH control and coagulation process in the chemical pretreatment stage before biological treatment. In the condition of alkali over pH 8, the white coagulating hard floc was formed and optimum pH was found at pH 10. The addition of aluminum sulfate was not contributable to the removal of COD, but it can play an important role to reduce the attachability of floc to the wall. Nonionic polymer showed a good settlability of floc and COD removal efficiency was obtained about 40%. The addition of GAC and PAC increased COD removal efficiency up to 45% and 55%, respectively.