A Case Study on Bulking Problems in Paper Recycling Effluent Treatment Plant in Malaysia

Redzwan, G. and Ying, L.L.S. and Ibrahim, S. and Annuar, M.S.M. (2008) A Case Study on Bulking Problems in Paper Recycling Effluent Treatment Plant in Malaysia. Asian Journal of Water, Environment and Pollution, 5 (2). pp. 13-18. ISSN 0972-9860,

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This study was conducted to investigate the cause of bulking problem at the effluent treatment plant (ETP) of a paper recycling plant in Malaysia. Hypothetically, the effluent is lacking nutrients and could induce the overpopulation of filamentous bacteria, and further cause the bulking problem during the effluent treatment using activated sludge process. Experiment to simulate treatment operations had been set up at laboratory. The simulation showed that the bulking started to occur after the first cycle of the fed-batch operation with the typical effluent. To make up the lacking of nutrients in the effluent, urea (N) and phosphate (P) were added as supplements with the ratio of BOD:N:P equal to 100:1.0:0.7. The supplemented effluent was again tested by a simulation study and showed that the bulking problem started to take place after the third cycle of feeding regime. Bulking problem also periodically took place in the actual operation when the same supplemented formula was applied; however the frequency of occurrence was lesser. Therefore, this study has shown that other than the lack of nutrients, there are other factors that could cause bulking problem.

Item Type: Article
Uncontrolled Keywords: Recycled paper mill effluent; Activated sludge process; Bulking; Filamentous bacteria; Nutrients supplement
Subjects: Q Science > QH Natural history
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 27 Apr 2018 01:26
Last Modified: 27 Apr 2018 01:26
URI: http://eprints.um.edu.my/id/eprint/18627

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