Development of biological filter as tertiary treatment for effective nitrogen removal: Biological filter for tertiary treatment.
A biological filtration process applicable to tertiary treatment of sewage for effective nitrogen removal was developed. It consisted of a nitrification filter (Filter 1) and/or a polishing filter with anoxic and oxic parts (Filter 2). A pilot plant set at a municipal sewage treatment plant was operated for 525 d with feed of real sewage. The maximum apparent nitrification rate in Filter 1 in winter was 0.54 kg N/m3- filter-bed d. In Filter 2, the maximum denitrification capacity was 4 kg N/m3 filter-bed d) in winter. SS was stably removed and high transparency water was obtained. The target water quality (SS, BOD, and T-N5 mg/L) was accomplished in winter with the LV of 202 m/d in Filter 2, which corresponds to 0.24 h of HRT. These results proved that this process is compact, stable, convenient to install, and cost effective to build and operate as tertiary treatment to remove nitrogen effectively.
Jeong
Jinwoo
J
Department of Environmental Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan.
Hidaka
Taira
T
Tsuno
Hiroshi
H
Oda
Toshiyuki
T
D005374:Filtration / Q000295:instrumentation*; D009584:Nitrogen / Q000302:isolation & purification*; D010865:Pilot Projects; D012722:Sewage; D013696:Temperature; D014867:Water / Q000737:chemistry*
D012722:Sewage; D014867:Water; D009584:Nitrogen