Nitrification performance of nitrifiers immobilized in PVA (polyvinyl alcohol) for a marine recirculating aquarium system

Citation
Jk. Seo et al., Nitrification performance of nitrifiers immobilized in PVA (polyvinyl alcohol) for a marine recirculating aquarium system, AQUACULT EN, 24(3), 2001, pp. 181-194
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Aquatic Sciences
Journal title
AQUACULTURAL ENGINEERING
ISSN journal
0144-8609 → ACNP
Volume
24
Issue
3
Year of publication
2001
Pages
181 - 194
Database
ISI
SICI code
0144-8609(200104)24:3<181:NPONII>2.0.ZU;2-L
Abstract
Characteristics of the nitrification processes with immobilized nitrifier c onsortium were evaluated for the development of the marine recirculating aq uarium system. In order to evaluate the activity of the nitrifiers, a 45 1 airlift reactor was used for the determination of ammonia removal rate for 40 days of operation. The ammonia removal efficiency rate was 98% with 23 g ammonia-N/m(3)/day, respectively. The activity of immobilized nitrifiers i n polyvinyl alcohol (PVA) beads treated by boric acid at the concentration of 15% was fully recovered, and the ammonia removal rate increased to 70 g ammonia-N/m(3)/day with 18 days of operation time. An acclimation experimen t of the immobilized nitrifiers from freshwater to seawater system was carr ied out For 60 days using a 2.5 1 airlift reactor with increased salt conce ntration. The ammonia was completely removed, and nitrite accumulated up to 6 mg/l but decreased to less than 0.1 mg/l after 30-40 days of operation. The salt concentration was related to the time to stabilize the system. Ano ther operation was carried out to evaluate the optimum hydraulic retention time (HRT) of the marine nitrification process for 35 days. The HRT was set in the ranee of 6.12-0.7 h. The highest ammonia removal rate, 63 g/m(3)/da y, was observed when the HRT was 1.0 h. (C) 2001 Elsevier Science B.V. All rights reserved.