Premium
Repeated phosphate removal from recirculating aquaculture system using cyanobacterium remediation and chitosan flocculation
Author(s) -
Rojsitthisak Pranee,
BurutArchanai Surachet,
Pothipongsa Apiradee,
Powtongsook Sorawit
Publication year - 2017
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12288
Subject(s) - flocculation , chitosan , photobioreactor , phosphate , recirculating aquaculture system , chemistry , suspension (topology) , pulp and paper industry , chromatography , environmental engineering , chemical engineering , aquaculture , biomass (ecology) , biology , environmental science , fish <actinopterygii> , biochemistry , fishery , ecology , mathematics , homotopy , pure mathematics , engineering
Unicellular cyanobacterium Synechocystis sp. was used for phosphate removal in a recirculating aquaculture system. The cell harvesting was performed using chitosan solution in this study. The parameters (i.e. cell density, pH of cell suspension and chitosan concentration) affecting the flocculation efficiency of chitosan were investigated. With the optimal condition, the repeated flocculation for phosphate removal in a photobioreactor was demonstrated. The results show that the flocculation efficiency of chitosan depends on cell density, pH of cell suspension and chitosan concentration. The optimal flocculation process could be accomplished by adjusting the pH to 7.2 before adding 20 mg/L chitosan followed by pH adjustment to 7.5. With single inoculation, the sequential process of phosphate removal using cyanobacterial uptake followed by cell flocculation using chitosan with the optimal condition in the photobioreactor was successfully achieved for 12 cycles with water from a recirculating fish tank.