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호기성 그래뉼 슬러지 선별 분리기가 호기성 그래뉼 슬러지의 안정성에 미치는 영향
권규태,김현구,안대희 한국환경과학회 2021 한국환경과학회지 Vol.30 No.12
In this study, the effect on the stability of Aerobic Granular Sludge (AGS) caused by an AGS separator was investigated. The AGS separator was a hydrocyclone. The main factors of the AGS separator were filter pore size (0.125∼0.600 mm), conical-to-cylindrical ratio (1.5∼3.0), and operating time (1∼20 min). The AGS/mixed liquor suspended solid (MLSS) ratio gradually increased to 0.500 mm (AGS/MLSS: 84.3±3.0%). AGS was best separated at the conical-to-cylindrical ratio of 2.5 (AGS/MLSS: 84.7±3.3%). As the operating time increased, the AGS separation performance also tended to increase. The shortest AGS separator run time, but the highest AGS separation performance was 10 min (87.0±2.5%). AGS stability was evaluated by operating the selected AGS separator and sequencing batch reactor. The average removal efficiencies of TOC, TCODCr, SS, TN, and TP were 95.7%, 96.9%, 93.0%, 89.0%, and 96.2%, respectively, which met the effluent standards in Korea. In addition, the AGS/MLSS ratio tended to remain constant, and the sludge volume index demonstrated a tendency to decrease from 140 mL/g to 70 mL/g. During the operation, the particles of AGS in optical microscope observations gradually increased.
연속회분식반응기 공정의 하이드로사이클론 도입 하수처리 최적 운전특성
권규태,김현구,안대희,Kwon, Gyutae,Kim, Hyun-Gu,Ahn, Dae-Hee 한국환경과학회 2022 한국환경과학회지 Vol.31 No.4
The purpose of this study was to evaluate the operational characteristics of wastewater treatment using Sequencing Batch Reactor (SBR) with Aerobic Granular Sludge (AGS) separator in the pilot plant. Pilot plant experiments were conducted using SBR with AGS separator and pollution removal efficiencies were evaluated based on the operational condition and surface properties of AGS. The results of the operation on water quality of the effluent showed that the average concentration of total organic carbon, suspended solids, nitrogen, and phosphorus was 6.89 mg/L, 7.33 mg/L, 7.33 mg/L, and 0.2 mg/L, respectively. All these concentrations complied the effluent standard in Korea. The concentration of mixed liquor suspended solid (MLSS) fluctuated, but the AGS/MLSS ratio was constant at 86.5±1.3%. Although the AGS/MLSS ratio was constant, sludge volume index improved. These results suggested that the particle discharged fine sludge and increased the AGS praticle size in the AGS. Optical microscopy revealed the presence of dense AGS at the end of the operation, and particles of > 0.6 mm were found. Compared to those of belt-type AGS separator, the required area and power consumption of the hydrocyclone-type AGS separator were reduced by 27.5% and 83.8%, respectively.
Nitrogen and phosphorus recovery from anaerobic digestate of food waste by struvite precipitation
권규태,남지현,김영오,장하영,장덕진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Struvite (MgNH<sub>4</sub>PO<sub>4</sub>·6H<sub>2</sub>O) production is a useful technique to remove phosphorus and nitrogen from wastewater. Struvite also processes a potential to be used as a slowly releasing fertilizer. The anaerobic food waste digestate containing high concentrations of phosphorus and ammonium can be a source of struvite. In this study, optimal conditions for phosphorus removal and struvite recovery were obtained by using response surface analysis with the central composite design. The maximum phosphorus removal efficiency and recovered concentration of struvite were 99.98% and 0.56 g/L respectively, at the conditions of pH 9.53, Mg/P molar ratio of 1.35, and Ca/P molar ratio of 0.92. Purity of obtained struvite was 77.8%, and it was thought that re-crystallization could raise the purity for a high-quality product. Supported by grants from COWEB (Project No.:2013001580002)