Nitrite oxidizing bacteria for water treatment in coastal aquaculture system

Asean-Fen International Fisheries Symposium - 2017

Noorak, S.^1 ; Rakkhiaw, S.^1 ; Limjirakhajornt, K.^1 ; Uppabullung, A.^1,2 ; Keawtawee, T.^1,2 ; Sangnoi, Y.^1,2

Department of Aquatic Science, Faculty of Natural Resources, Prince of Songkla University, Songkhla, Hat Yai

90110, Thailand^1

Discipline of Excellence for Sustainable Aquaculture, Prince of Songkla University, Songkhla, Hat Yai

90110, Thailand^2

关键词: 16S rRNA gene;    Biological oxygen demand;    Coastal aquaculture;    In-control;    Nitrite removal rates;    Nitrite-oxidizing bacteria;    Removal rate;    Water quality improvements;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/137/1/012005/pdf
DOI  :  10.1088/1755-1315/137/1/012005

来源: IOP

【 摘 要 】

This research aimed to isolate and characterize nitrite oxidizing bacteria and to study their capability for water quality improvement. Fourteen strains of bacteria with nitrite-oxidizing character were isolated after 21 days of enrichment in Pep-Beef-NOB medium contained NaNO2. Two strains, SF-1 and SF-5, showed highest nitrite removal rate for 42.42% and 37.2%, respectively. These strains were determined an efficiency of open-system wastewater treatment for 14 days. The results showed that control, SF-1 and SF-5 had remove ammonia from day 1 to day 6. At the end of the study, ammonia was removed by the control, SF-1 and SF-5 for 81.27%, 70.1% and 69.82%, respectively. Nitrite concentration was lowest at day 8 with removal rate of 98.73%, 98.3% and 97.24% from control, SF-1 and SF-5, respectively. However, nitrite concentration in control experiment was increased again at day 11 whereas in SF-1 and SF-5 were increased at day 13. Chemical Oxygen Demand (COD) was decreased by 77.78%, 73.50% and 78.63% in the control, SF-1 and SF-5, respectively. Biological Oxygen Demand (BOD) in the control, SF-1 and SF-5 were reduced by 85.92%, 79.53% and 82.09%, respectively. Based on 16S rRNA gene, SF-1 and SF-5 were identified as Bacillus vietnamensis and B. firmus, respectively.