Premium
Reclamation of wastewater from a steel‐making plant using an airlift submerged biofilm reactor
Author(s) -
Yun YeoungSang,
Lee Min Woo,
Park Jong Moon,
Lee ChoogIl,
Huh JaeSun,
Chun HeeDong
Publication year - 1998
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(1998100)73:2<162::aid-jctb940>3.0.co;2-p
Subject(s) - nitrification , aeration , wastewater , effluent , airlift , hydraulic retention time , environmental science , environmental engineering , pulp and paper industry , chemical oxygen demand , chemistry , waste management , bioreactor , nitrogen , engineering , organic chemistry
A bench‐scale airlift submerged biofilm reactor was developed to test the possibility of nitrification of the final effluent discharged from a wastewater treatment process of a steel‐making plant with an aim of reusing it as irrigation water. Despite the fluctuation of ammonia concentration in the wastewater (55–90 mg NH 3 ‐N dm −3 ), the ammonia was completely converted to nitrate in the hydraulic retention time of 8 h. When decreasing the hydraulic retention time further down to 4 h, the nitrification efficiency decreased to 67·9%. However, the nitrification efficiency could be significantly enhanced by increasing the airflow rate due to an increase in both of the oxygen transfer rate and liquid circulation rate. At the aeration rate of 4 dm 3 min −1 and the hydraulic retention time of 4 h, the nitrification efficiency was as high as 92·6% and the nitrification rate was 34·6 mg NH 3 ‐N dm −3 bed h −1 . © 1998 Society of Chemical Industry