Analysis of the operating factors of dissolved air flotation (DAF) process for effluent quality improvement from aquaculture rearing tank

Title
Analysis of the operating factors of dissolved air flotation (DAF) process for effluent quality improvement from aquaculture rearing tank
Authors
기재홍Hyoungjun Kim이주영한무영강희웅
Keywords
양식; aquaculture; 용존공기부상법; dissolved air floation; 기포발생장치; inline injection bubble generation; 고형물제거; solid removal
Issue Date
2012-02
Publisher
상하수도학회지
Citation
VOL 26, NO 1, 107-113
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/43759
ISSN
12257672
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KIST Publication > Article
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