Analysis of the operating factors of dissolved air flotation (DAF) process for effluent quality improvement from aquaculture rearing tank
- Analysis of the operating factors of dissolved air flotation (DAF) process for effluent quality improvement from aquaculture rearing tank
- 기재홍; Hyoungjun Kim; 이주영; 한무영; 강희웅
- 양식; aquaculture; 용존공기부상법; dissolved air floation; 기포발생장치; inline injection bubble generation; 고형물제거; solid removal
- Issue Date
- VOL 26, NO 1, 107-113
- Pollutants in aquaculture system effluent mostly originated from solid wastes including uneaten feed and excreta of cultured species.
In this research, DAF(Dissolved Air Flotation) unit is suggested as an integrated solid control unit especially as a form of IIBG(Inline
Injection Bubble Generation) process in aquaculture system. Solid removal performance of DAF unit was examined under various
operation and salinity conditions with turbidity and suspended solid. Solid waste removal efficiencies were found to be affected by
operation conditions including saturator pressure, recycle ratio, coagulant concentration. Solid removal efficiency was higher under
higher saturator pressure and recycle ratio under which condition larger number of bubbles is generated. Coagulant is thought to
have important role in creating bubble-particle aggregate by showing better removal efficiency with higher concentration. However
higher saline water showed less effectiveness in removing solids by DAF(IIBG). Application of DAF(IIBG) process also showed
additional effect in phosphate removal and DO(Dissolved Oxygen) supply. Phosphate existed in polluted water was removed up to
46% after treatment, which is thought to attribute to aluminium phosphate precipitation. And DO concentration was found to
increase over 50% of initial saturation concentration after the injection of micro-bubbles. Through experiments on solid removal from
aquaculture effluent, DAF(IIBG) process is estimated to be effective solid control method. This property can help aquaculture system
being installed and operated simply and effectively.
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