| Reduction of phosphorous at WWTP combined with DAF and A2/O |
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학술지명 Desalination and Water Treatment
저자 권순범,독고석,김두일,YTGuan
발표일 2014-04-28
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Regulation of the phosphorous (P) concentration in effluent from the Jinju wastewater treatmentplant (WWTP) in southern part of Korea has recently been strengthened, with a reductionin the acceptable P limit from 2.0 to 0.2 mg/L. Various treatment processes have beenintroduced and applied to meet the regulation, after use of biological treatments such as conventionalactivated sludge, anoxic?oxic (A/O), and anaerobic?anoxic?oxic (A2/O) treatments.The present work introduces a hybrid system of A2/O and dissolved air flotation (DAF)treatment to remove P from the effluent. The total capacity of the WWTP is 190,000m3/d. Thedimensions of the DAF basins are 8m (width), 16m (length), 4.2m (height), 6 basins, and thecapacity is 2,995m3/d. The retention time and recycling ratio are 19 min and 15%,respectively. The surface loading rate is 240 m/d. Operation of the system with A2/O+DAFhas already commenced and total P was reduced from 2.18 to 0.03 mg/L. A2/O+DAFtreatment improved the mean effluent concentrations of total phosphorus, chemical oxygendemand, and suspended solids by approximately 70, 29, and 27%, respectively, comparedwith the corresponding levels in effluent after A2/O treatment alone. |