호기성 입상슬러지와 활성슬러지의 특성비교

김광수 ( Kwang Soo Kim ),이희자 ( Hee Ja Lee ) 한국수처리학회 2003 한국수처리학회지 Vol.11 No.2

N/A This study investigated the sludge characteristics of activated sludge(AS) and granular activated sludge(GAS) withdrawn from the bench scale bioreactor. Granular sludge shows much better settling properties than activated sludge because of their larger size and density. The settling velocity of the GAS was much higher than the settling velocity of AS, and then the settling velocity was decreased with sludge concentrations. The specific settling velocity of GAS and AS were 11.8 m/g·h and 0.65m/g·h at MLSS of 2650㎎/L, respectively. The oxygen uptake rate of GAS was much better 0.39 ㎏ O₂/㎏ MLSS·d than 0.15 ㎏ O₂/㎏ MLSS·d of AS. The particle size of the granular sludge was larger than activated sludge. The median diameter of GAS was 0.47mm while the diameter was 0.076㎜ for the AS. The elemental composition of granular sludge was investigated by energy dispersive X-ray spectroscopy. The GAS had a high sulfur content of 13.1%, calcium 18.5%, ferrous 11.2% of the sludge volume. This study shows that aerobic granules have a excellent settleability, large size, and high activity as compared to conventional activated sludge flocs.

호기성 입상활성슬러지를 이용한 유기물 제거 및 슬러지 침강특성

이희자 ( Lee Hui Ja ),김광수 ( Kim Gwang Su ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.6

In this study, organic material removal and the settleability of granular sludge on operating conditions were investigated. The removal rate of SS and COD reached to 95% and 87% respectively at recycle rate of 100, HRT of 2.1hr and organic loading rate of 0.9 ㎏/㎥·day. The COD removal rate of granular sludge linearly increased with the increase of the influent COD concentration. As compared to activated sludge flocs, aerobic granulation significantly improves the settleability of sludge. so the SVI decreased from initial 220㎎/L to 59㎎/L. Low pH and high DO concentration lead to the formation of stable aerobic granules in aerobic upflow reactor. During the early stages of granule formation, a high exopolymer production was observed, which would promote the initial cell flocs. It was concluded that the advantages of aerobic granules can be seen as good settling ability, high retainable biomass concentration and ability to withstand high organic loading rate.

호기성 그래뉼 슬러지를 이용한 축산폐수의 생물학적 처리에 관한 연구

김현구,안대희 한국환경과학회 2023 한국환경과학회지 Vol.32 No.7

In this study, the treatment of livestock wastewater using an aerobic granular sludge based sequencing batch reactor was investigated. The reactor operation was carried out by general injection and split injection methods. The average removal efficiency of organic matter after the adaptation period was 71.5 and 87.4%, respectively. Some untreated organic matter was attributed to recalcitrant organic matter. The average removal efficiency of total nitrogen was 65.6 and 88.4%, respectively. These results indicate that the denitrification reaction by split injection was carried out smoothly. As for the solids, the ratio of aerobic granular sludge/mixed liquor suspended solid can be determined as the main factor of the process operation, and the ratio increased gradually and finally reached 86.0%. Correspondingly, the sludge volume index (SVI) was also improved, reaching 54 mL/g at the end of operation, and it is believed that the application of a short settling time contributed to the improvement of settleability.

혐기.호기조건에 따른 입상슬러지공정의 기질저감효과 비교

현길수 ( Kil Soo Hyun ),최정우 ( Jeung Woo Choi ) 한국수처리학회(구 한국수처리기술연구회) 2011 한국수처리학회지 Vol.19 No.1

In this study, the characteristics of substrate reduction and sludge granulation in anaerobic and aerobic granular sludge reactors (ANGSR and AGSR) were investigated by using synthetic wastewater. As a result, the pH, DO and alkalinity in the AGSR were relatively higher than those in the ANGSR. The efficiency of AGSR on organic and nitrogen reductions was slightly higher than those of the ANGSR. These results indicate that with regard to substrate removal, the ANGSR was suitable for treating high-strength substrate, while the AGSR was appropriate for high influent organic loadings. Granular sludges in both the ANGSR and AGSR investigated by using microscopy observation were a compact and strong in structure, compared with conventional flocculent activated sludge. In particular, the granular sludge in the ANGSR was observed to be affected by ammonia nitrogen under organic/nitrogen ratio of less than 5.

호기성 그래뉼 슬러지를 이용한 하수고도처리기술(AGS-SBR)

최한나 ( Han Na Choi ),모우종 ( Woo Jong Mo ) 한국물환경학회(구 한국수질보전학회) 2021 한국물환경학회지 Vol.37 No.1

Aerobic granular sludge (AGS) can be classified as a type of self-immobilized microbial aggregates measuring more than 0.2 mm. It offers the option to simultaneously remove COD, N, and P that occur in different zones inside a granule. Also, AGS is characterized by high precipitability, treatability with high organic loading, and high tolerance to low temperature. In this study, a sequencing batch reactor inoculated with AGS (AGS-SBR) is a new advanced wastewater treatment process that was proven to grow AGS with integrated nutrient removal and low C/N ratio. A pilot plant, AGS-SBR with a capacity of 225 m³/d was installed at an S sewage treatment plant in Gyeonggi-do. The results of the operation showed that the water quality of the effluent indicated that the value of BOD5 was 1.5 mg/L, CODMn was 11.4 mg/L, SS was 6.2 mg/L, T-N was 13.2 mg/L, and T-P was 0.197 mg/L, and all of these values reliably satisfied an effluent standard (I Area). In winter, the T-N treatment efficiency at a lower temperature of less than 11℃ also showed reliability to meet the effluent standard of the I Area (20 mg/L or less). Analysis of microbial community in AGS showed a higher preponderance of beneficial microorganisms involved in denitrification and phosphorus accumulation compared with activated sludge. The power consumption and sludge disposal cost were reduced by 34.7% and 54.9%, respectively, compared to the domestic SBR type sewage treatment plant with a processing capacity of 1,000 m³/d or less.

호기성 입상화 장치를 이용한 입상슬러지 생성 및 특성

이봉섭(Bong Seob Lee),최성우(Seong Woo Choi) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.12

본 연구는 고분자 응집제를 이용하여 짧은 시간에 입상형태의 슬러지를 제조한 다음, 입상슬러지를 호기성 입상화 장치에 주입하여 입상화를 시도하였다. 각 반응조에서 호기성 입자의 형성에 따른 입자의 크기, 밀도, 입자내 미생물 체외분비 고분자물질 등의 물리·화학적인 특성을 조사하였다. 입상형태의 슬러지를 호기성 입상화 장치에 주입하여 COD 부하량 3, 6, 9㎏·COD/m3·d로 35일간 운전한 결과 최종 형성된 호기성 입장의 평균 크기는 각각 3.6 mm, 4.3 mm, 3.4 mm 이었고 호기성 입자의 침강속도는 각각 1.5 cm/s, 1.6 cm/s, 1.2 cm/s 이었다. COD 부하량에 따른 미생물 군집체의 비성장속도는 0.12 d-1, 0.135 d-1, 0.133 d-1이었으며 전반적으로 호기성 입상화 장치에서는 COD 부하량이 6 ㎏·COD/m3·d로 운전된 반응조에서 호기성 입자의 물리·화학적인 특성이 우수하였다. This study was carried out to investigate of aerobic granulation by using aerobic granular reactor. To make aerobic granular sludge in short period of time, we used polymer. In reactor, we have studied on physicochemical characteristics of particle size, density, and microbial secreting polymer depending on aerobic particle`s formation. The results of running aerobic granular reactor with 3, 6, 9 kg·COD/m3·d of COD loading rate and 35 days reaction time showed that particle size were 3.6 mm, 4.3 mm, and 3.4 mm respectively. The settling velocities were 1.5 cm/s, 1.6 cm/s, and 1.2 cm/s respectively. The microbic growth rates were 0.12 d-1, 0.135 d-1, and 0.133 d-1 respectively. The overall result of aerobic granular reactor showed that 6 kg·COD/m3·d of COD loading rate had optimal physicochemical characteristics.

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.

Treatment of Wastewater with High Organic Loadings Using Granular Sludge in Sequencing Batch Reactor

현길수,이석주,최정우 한국수처리학회 2008 한국수처리학회지 Vol.16 No.1

The objectives of this research to evaluate the effects of aerobic granular sludge SBR on the treatment of the wastewater with high level of organic loadings was to investigate the characteristics of operating conditions of the reactor and the characteristics of organic and nutrient removal with influent loadings. As a results, the pH values increased in the range of 6.8 to 8.5 during a cycle. DO concentrations were in the range of 6-8mg/L and decreased slightly at the initial operating period as a results of initial oxygen consumption due to the removal of considerable amount of organic at initial reaction. Within operating time of two weeks, MLSS concentration ranged from 500 to 4480 mg/L and sludge volume index (SVI) were in the range of 25 to 8 mL/g at steady state. At influent concentrations of 400-700mg COD/L, approximate <30mg TN/L, and <16 mg TP/L, the percentage of organic and nutrient removals were in the range of 45 to 77% for COD, 46.7 to 71.0% for TN, and 67.3 to 74.0% for TP, respectively. It seems that aerobic granulation is not sensitive to the organic loading rate. Although the effect of organic loading rate on the formation of aerobic granules is insignificant, the physical characteristics of aerobic granules depend on the organic loading rate.

호기성 그래뉼 슬러지를 이용한 고농도 염분 함유 폐수의 생물학적 탈질 반응에 관한 연구

김현구 ( Hyun-gu Kim ),안대희 ( Dae-hee Ahn ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.7

The purpose of this study is to biological treatment of high salinity wastewater using Aerobic Granular Sludge (AGS). In laboratory scale’s experiments research was performed using a sequencing batch reactor, and evaluation of the denitrification reaction in accordance with the injection condition of salinity concentration, surface properties of microorganisms, and sludge precipitability was performed. The results showed that the salinity concentration increased up to 1.5%, and there was no significant difference in the nitrogen removal efficiency; however, it showed a tendency to decrease gradually from 2.0% onward. The specific denitrification rate (SDNR) was 0.052 0.134 mg NO₃ ^--N/mg MLVSS (mixed liquor volatile suspended solid)·day. The MLVSS/MLSS (mixed liquor suspended solid) ratio decreased to 76.2%, and sludge volume index (SVI₃₀) was finally lowered to 57 mL/g. Using an optical microscope, it was also observed that the initial size of the sludge was 0.2 mm, and finally it was formed to 0.8-1.0 mm. Therefore, salinity injection provides favorable conditions for the formation of an AGS, and it was possible to maintain stable granular sludge during long-term operation of the biological treatment system.

Chemical extraction and quantification of extracellular polymeric substances in unspiked-metaldehyde and spiked-metaldehyde of rubber aerobic granular sludge and molasses aerobic granular sludge

Azlina Mat Saad,Farrah Aini Dahalan,Naimah Ibrahim,Sara Yasina Yusuf 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.6