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Full‐Scale Experience for Nitrogen Removal from Piggery Waste
Author(s) -
Choi Euiso,
Kim Daehoon,
Eum Youngjin,
Yun Zuwhan,
Min KyongSok
Publication year - 2005
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/j.1554-7531.2005.tb00297.x
Subject(s) - kjeldahl method , anoxic waters , alkalinity , effluent , wastewater , chemical oxygen demand , denitrification , chemistry , nitrogen , pulp and paper industry , nitrification , environmental chemistry , environmental engineering , environmental science , organic chemistry , engineering
The nitrogen‐removal performances of three full‐scale piggery wastewater treatment plants, with different organic and nitrogen loads, at the capacity ranges of 95 to 130 m 3 /d, were compared in this study. Plants 1 and 2 can be characterized as the modification of anoxic–aerobic operating systems, while an anaerobic and anoxic–aerobic system was used in plant 3. The influent piggery wastewater concentration for plant 1 was relatively lower, but with higher organic and nitrogen loads, resulting in higher chemical oxygen demand (COD) and ammonium‐nitrogen in effluent. Plant 2 was operated with strong piggery wastewater, resulting in a higher operating temperature. The high temperature could inhibit the nitrifying activity in plant 2. Although plant 3 was operated with a higher influent total COD‐to‐total Kjeldahl nitrogen ratio (TCOD:TKN), an additional external carbon source was required to polish the final effluent to remove nitrogen. Influent COD in plant 3 was used in the anaerobic–anoxic reactor for both methane (CH 4 ) production and denitrification. Based on various mass balances, including caloric, COD, and alkalinity, the key elements for the successful nitrogen removal from the piggery waste were reactor temperature (less than 35°C), influent TCOD:TKN (greater than 6), and alkalinity‐to‐TKN ratio (greater than 3).