• Title/Summary/Keyword: Activated Sludge

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The Study of Biofouling Control and Cause Material in Hybrid Process of Pure Oxygen and Submerged Membrane Bio-reactor (순산소 고율포기시스템 및 침지식 MBR융합공정에서 Biofouling 제어 및 원인물질 규명에 관한 연구)

  • Lee, Sang-Min;Kim, Mi-Hyung
    • Journal of Korean Society on Water Environment
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    • v.27 no.1
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    • pp.44-53
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    • 2011

  • Membrane bio-reactor (MBR) has several advantages over the conventional activated sludge process, including a high biomass, low sludge production, and better permeate quality. Therefore, the MBR have gained popularity for municipal and industrial wastewater treatment. However the MBR usually were used for sewage and low streng th wastewater treatment because of membrane fouling problem and limitation of oxygen transfer into biomass. In this study, the hybrid process combining MBR and pure oxygen was tested for high strength organic wastewater treatment in the COD loading range from 2 to $10kgCOD/m^3{\cdot}day$. The hybrid process, membrane coupled pure oxygen high compact reactor (MPHCR), had been operated for one year and operation parameters, the effect of COD loading, MLSS concentration and the location of membrane module were studied for membrane fouling characteristic. Also membrane resistance test and the component of foulant was analyzed to investigate what is specific foulant in the MBR.

  • https://doi.org/10.15681/KSWE.2011.27.1.6 인용 PDF KSCI

The Study on Ozone Treatment of Wasting Activated Sludge for VFA Production and Reuse as Carbon Source for Phosphorus Release (잉여슬러지의 오존분해에 따른 VFA의 생성 및 인 방출을 위한 탄소원으로의 재이용 가능성에 관한 연구)

  • Ko, Eun-Taek;Cho, Jin-Woo;Park, Eun-Young;Ahn, Kyu-Hong
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.10
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    • pp.1052-1057
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    • 2005

  • Recently, the ozone treatment of wasting activated sludge has become one of the effective and feasible process for the sludge reduction. The objective of this study is to investigate the availability of ozonized wasting sludge on external carbon sources 13r phosphorus release. Experiment results showed that the ozone treatment of activated sludge could produce a large amount of VFA such as acetic acid and isobutyric acid. For example, 50.24 mg/L acetic acid was produced with the ozone dose of 0.05 g $O_3/g$ SS, and 123.56 mg/L acetic acid with 0.5 g $O_3/g$ SS. The higher ozone dose was applied, the more VFA was produced from sludge reduction into a limited point. Finally, using ozonated sludge as only carbon source, the batch experiment, to measure phosphorus release rate in anaerobic condition were performed. The specific phosphorus release rates were investigated as 0.94, 1.37, 1.48, 1.68 mg P/g VSS/hr with ozone dose of 0.05, 0.1, 0.2, 0.5 g $O_3/g$ SS, respectively. Considering the degree of mineralization, VFA production, phosphorus release rate, and economical aspect, the optimal ozone dose for sludge reduction and using carbon sources ranged from 0.05 to 0.1 g $O_3/g$ SS.

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Effect on nitrogen removal in the intermittent aeration system with the anaerobic archaea added (혐기성 아키아 주입이 간헐폭기 시스템에서 질소제거에 미치는 영향)

  • Lee, Sang-Hyung;Park, Noh-Back;Park, Sang-Min;Jun, Hang-Bae
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.11
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    • pp.1186-1192
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    • 2005

  • The relationship between bacteria and anaerobic archaea, sludge yield coefficient and nitrogen removal rate were investigated in intermittent aeration systems(I/A) with added archaea, I/A and conventional activated sludge system. As the archaea solution was added to the I/A reactor, organic removal rate as well as nitrogen removal rate increased. Also, sludge production rate in I/A system added the archaea was maintained lower than other systems because sludge yield coefficient was decreased due to the role of anaerobic archaea such as anaerobic degradation of organics. The experimental data supported the possibility of symbiotic activated sludge system with anaerobic archaea under intermittent aeration, leading to the enhanced nitrogen removal. Crucial results to be presented are: 1) specific oxygen utilization rate(SOUR) of the I/A-arch system was $2.9\;mg-O_2/(g-VSS{\cdot}min)$. SOUR and nitrification rate of the sludge from the I/A-arch system was higher than those from the I/A and A/S reactors. 2) Removal efficiencies of $TCOD_{Cr}$ in the I/A-arch, I/A and A/S reactors were 93, 90 and 87%, respectively. 3) Nitrification occurred successfully in each reactor, while denitrification rate was much higher in the I/A-arch reactor. Efficiencies of TN removal in the I/A-arch, I/A and A/S reactors were 75, 63 and 33%, respectively.

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