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DOI : , Vol.20, No.1, 3 ~ 11, 2012
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| Title |
| The Determination of Optimum Coagulant for Tunneling Wastewater Treatment |
| 강용태 Yong Tae Kang , 손정호 Jeong Ho Sohn , 김남경 Nam Kyoung Kim , 송근관 Keune Kwan Song |
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| Abstract |
| The objective of this study is to evaluate the optimum coagulant for efficient treatment of tunneling wastewater with high turbidity concentration of 790-827 NTU. The pH and dosage of coagulant were changed for determination of optimum coagulant for tunneling wastewater treatment. Characteristics of influent tunneling wastewater were: pH 6.94~7.05, Turbidity 790~827 NTU and SS 543~595 mg/L. Optimum coagulant was determined by jar-test using Alum. PSQ-M. PAC. PACS-II and FeCla as a coagulant. Based on the results of jar-test. optimum pH values were 9 for alum and PSO-M and 7 for PAC. PACS-II and FeCI3. respectively. Optimum dosages of coagulants were: alum 70 mg/L. PSO-M 10 mg/L. PAC 50 mg/L. PACS-II 10 mglL and FeCla 15 mglL. respectively. Operation costs of alum. PSO-M. PAC. PACS-II and FeCI3 were 127.6 won/kg. 118.9 won/kg. 15.5 won/kg, 3.3 won/kg and 3.6 won/kg. respectively. When considering optimum pH and dosage of coagulant. PACS-II coagulant was more effective than Alum, PSO-M, PAC and FeCl3. |
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| Key Words |
| Tunneling wastewater, coagulation, pH, operation cost, PACS-2 |
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