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KMID : 1156220110370040315
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Journal of Environmental Health Sciences
2011 Volume.37 No. 4 p.315 ~ p.322
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Removal of Nitrogen in Seafood Processing Wastewater Using High-rate Anaerobic Process and Nitritation-denitritation
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Choi Yong-Bum
Kang Dong-Gu
Park Sang-Sung
Eum Ki-Hyun
Rim Jay-Myoung
Kwon Jae-Hyouk
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Abstract
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Objectives: Organic matter and nitrogen were removed using the EGSB process, a high-rate anaerobic process, in combination with a nitritation-denitritation process, in order to ensure the stable treatment of seafood processing wastewater.
Methods: The upflow velocity of an EGGS reactor was operated at 10 m/hr for maximal organics removal efficiency. For removal of nitrogen from seafood processing wastewater a nitritation-denitriation process was applied
Results: The efficiency of the EGSB process showed that it has an 80% or more organic matter (CODcr) removal efficiency with an HRT of six hours or more at influent loadings of 17.34 kgCOD/m3/day or less. The methane product for TCODcr removal was 0.23-0.38 m3CH4/kgCODrem., which was similar to the theoretical generation of STP-state methane, 0.35 m3CH4/kgTCODrem. In the nitritation-denitritation process, the nitritation conversion rate to NH4 +-N concentration was 82% to 87%, 72% to 81% and 64% to 69% when HRT was 24 hr, 21 hr and 18 hr, respectively. In the denitritation process, the ratio of SCOD consumption to NOx-N removal ranged from 2.347 to 2.587. It was 2.472 on average.
Conclusions: The optimal HRT for stable processing of seafood processing wastewater is six hours or more. The ratio of nitrite to total NOx-N was 82% to 96%, which indicates that nitrite accounts for the largest portion of the product.
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KEYWORD
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Denitritation, EGSB, Nitritation, Seafood processing wastewater
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