Nitrogen removal from a piggery wastewater was investigated in a post-denitrification modified Lüdzack Ettinger (PDMLE) process. Overall hydraulic retention time (HRT) of the PDMLE, consisting of contact/separator (C/S), nitrification, denitrification and re-aerobic bioreactor was 10 days. 60% of the influent SCOD was separated in the C/S by contacting the return sludge with the synthetic wastewater, however, only 10% of the influent SCOD was separated from the piggery wastewater. Biosorption capacities of the synthetic wastewater and piggery wastewater were 800 and 150 mg/g-MLSS, respectively. In spite of the high organic and nitrogen load, nitrification efficiency was above 95%, and nitrification rate was about 180 mg-NH4+-N/L·day. The removed ΔCOD/Δnitrate ratios in the denitrification tank were 4.0 and 11.5 g-SCOD/g-nitrate, while denitrification rates were 8.4 and 2.6 mg-nitrate/day for synthetic and piggery wastewater, respectively. In the proposed PDMLE process, both bio-sorbed and bypassed organic matter could be successfully used for nitrate reduction as carbon sources and the final TN removal efficiency was as high as 95%.
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Research Article|
March 01 2004
Biological nitrogen removal using bio-sorbed internal organic carbon from piggery wastewater in a post-denitrification MLE process
S.-M. Park;
1Department of Environmental Engineering, Chungbuk National University, San 48 Kaeshindong Cheongju, Korea 361-763 (E-mail: psm37@hanmail.net)
E-mail: psm37@hanmail.net
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Y.-J. Chung;
Y.-J. Chung
3Division of Environmental and Urban Engineering, AJOU University, San 5 Wonchundong Suwon, Korea (E-mail: yjchung@madang.ajou.ac.kr)
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S.-H. Lee
S.-H. Lee
4Department of Civil and Environmental Engineering, Korea Advanced Institute Science and Technology, 373-1, Guseongdong Yuseong-gu, Daejeon, Korea, 305-701 (E-mail: sanghyung@kaist.ac.kr)
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Water Sci Technol (2004) 49 (5-6): 373–386.
Citation
S.-M. Park, H.-B. Jun, Y.-J. Chung, S.-H. Lee; Biological nitrogen removal using bio-sorbed internal organic carbon from piggery wastewater in a post-denitrification MLE process. Water Sci Technol 1 March 2004; 49 (5-6): 373–386. doi: https://doi.org/10.2166/wst.2004.0777
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