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http://dx.doi.org/10.4491/KSEE.2017.39.4.201

Evaluation of Streaming Current Detector (SCD) and Charge Analyzing System (CAS) for automation of coagulant dosage determination  

Kim, Sang-Goo (Water Quality Institute, Busan Water Authority)
Son, Hee-Jong (Water Quality Institute, Busan Water Authority)
Lee, Jeong-Kyu (Water Quality Institute, Busan Water Authority)
Yeom, Hoon-Sik (Water Quality Institute, Busan Water Authority)
Yoo, Pyung-Jong (Water Quality Institute, Busan Water Authority)
Publication Information
Journal of Korean Society of Environmental Engineers / v.39, no.4, 2017 , pp. 201-207 More about this Journal
Abstract
This study was conducted to investigate the characteristics of the stream current detector (SCD) and charge analyzing system (CAS), which are well known as the automatic coagulant dosage determination instruments. When the SCD system was used, the current charge value set at pH 9.3 could not be used as the coagulant dosage when the pH of the raw water decreased to 5.7, and the current charge value corresponding to pH 5.7 was required to be reset. In case of CAS system, polydadmac is stable as a cationic titrant when the pH of the raw water ranged 9.3 to 6.0. And it was effective to use polydadmac as a cationic titrant for high turbidity water. The current charge of polydadmac was almost constant between pH 5 and 11, however, the difference in charge of alum is six times in this pH range. Therefore, when the pH of the raw water was changed, it seems that the coagulant used in the actual water treatment plant was as a good cationic titrant.
Keywords
Coagulation; Stream Current Detector (SCD); Charge Analyzing System (CAS); Cationic Titrant; Polydadmac; Alum;
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1 Kim, W, K., Sung, Y, K., Yoo, H, S. and Kim, J, T., "Optimization of coagulation/flocculation for phosphorus removal from activated sludge effluent discharge using an online charge analyzing system titrator (CAST)," J. Ind. Eng. Chem., 21, 269-277(2015).   DOI
2 Xia, S., Li, X., Zhang, Q., Xu, B. and Li, G., "Ultrafiltration of surface water with coagulation pretreatment by streaming current control," Desalination, 204(1-3), 351-358(2007).   DOI
3 Nam, S. W., Jo, B. I., Kim, M. K., Kim, W. K. and Zoh, K. D., "Streaming current titration for coagulation of high turbidity water," Colloid Surface A, 419, 133-139(2013).   DOI
4 Tanaka, H. and Ichiura, H., "A novel and simple method for determining the cationic demand of suspensions using chromophoric labeled cationic polymers," Colloid Surface A, 159, 103-107(1999).   DOI
5 Kim, S. G., Choi, K. J., Son, H. J., Jun, Y. C., Rhee, J. B., Shon, I. S., Lee, Y. D. and Kim, S. H., "Monitoring of coagulation performance and determination of coagulant dosage using a pilot in-line filter," Water Sci. Technol., 53(4-5), 411-417(2006).   DOI
6 Dentel, S. K., Thomas, A. V. and Kingery, K. M., "Evaluation of the streaming current detector-I. Use in jar tests," Water Res., 23(4), 413-421(1989).   DOI
7 Dentel, S. K., Thomas, A. V. and Kingery, K. M., "Evaluation of the streaming current detector-II. Continuous flow tests," Water Res., 23(4), 423-430(1989).   DOI