공단 폐슬러지에 있어서 응집제첨가에 따른 탈수특성에 관한 연구 = A Study on Dewaterability Properties according to Addition of Coagulant to Sludge in Industrial Wastewater

다국어 초록 (Multilingual Abstract)

To reduce the rate of water contained in the sludge of the industrial wastewater, this study was conducted by comparatively considering the dewatering effect according to addition of coagulant and dewaterability properties of sludge. The result of this study is summarized as follows.
1. The dewaterability properties of sludge presented that the suitable difference in pressure necessary a good dewaterability seems to be 200, 300㎜Hg.
2. When adding an ploymer coagulant to the sludge, its dewaterability properties showed that the higher the rate of addition, the better its dewaterability. Also, it appeared that the adequate rate of addition is about 0.3-0.7% when SS concentration of sludge is 18,000㎎/l, and that is about 0.3-0.4% when SS concentration of sludge is 35,000㎎/l, when this rate is more than 0.5%, it was shown that the dewaterability is insufficient due to both initial moment dewaterability and closing condition of the filter basin.
3. When adding 0.4% ploymer coagulant, the adding rate of inorganic coagulant indicated that the more the added inorganic coagulant, the lower the specific resistance. When the rate of addition is more than 9.0%, however, the filter water indicated a light yellow.
For the reason, it is expected that the inorganic coagulant flows out ineffectively. It is expected that the adequate rate of inorganic coagulant addition is between 6.0-9.0%, therefore, while it is better to use both polymer and inorganic coagulant for dewatering the sludge.