• Journal of Korean Society of Water and Wastewater
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• v.24 no.1
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• pp.85-92
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• 2010

In this study, odorous compounds emitted from various wastewater treatment were treated with using the non-thermal plasma reaction, and the effluent gas from the plasma reactor was introduced to a waste sludge reactor to achieve simultaneous sludge reduction. Hydrogen sulfide, the model odorous compound, was removed at 70% using the plasma reaction, and greater than 99% removal efficiency was observed when treated by the sludge reactor. In addition, the sludge reactor showed a high efficiency of ozone removal. As ozone reacted with sludge, oxidation with organic matters took place, and total COD decreased by 50~60% and soluble COD increased gradually. As a result, the integrated process consisting of the non-thermal plasma and the sludge reactor can be successfully applied for the simultaneous treatment of malodorous gas and waste sludge.

• Proceedings of the KAIS Fall Conference
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• 2011.12a
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• pp.194-195
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• 2011

런던협약 '96의정서' 발효에 의해 2012년부터 하수 슬러지 처분 방법 중 대부분을 차지하고 있는 유기성 슬러지 등 폐기물의 해양투기가 전면 금지되기 때문에 효과적인 하수 슬러지 처분 및 슬러지 감량화에 대한 기술 수요가 꾸준히 제기되고 있다. 본 연구에서는 슬러지 처분법의 대안으로 슬러지 가용화 연구에 고전압 임펄스을 접목시켜 슬러지 가용화 연구를 수행하였다. 본 연구에서 사용된 고전압 임펄스 장치는 power supply, HV generator, capacitor와 switch, impulse generator로 구성되어 있다. 고전압 임펄스에 의한 슬러지의 특성 변화를 관찰하였다. HVI를 90분 인가하였을 경우 하수 슬러지의 MLSS와 MLVSS는 각각 평균 8%와 9% 감소하였다. 또한 SCOD는 341% 증가하였고, TN과 TP는 각각 34%와 90.9% 증가하였다.

• Journal of Korean Society of Environmental Engineers
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• v.28 no.1
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• pp.88-96
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• 2006

Among the various methods for minimization of waste activated sludge, maintaining a low F/M ratio in the bioreactor is known to be the most effective reliable one. In this research, various experiments were performed to check the capability of the nonwoven fabric filter bioreactor, which has been proved able to maintain a low F/M ratio by maintaining a high MLSS concentration, for excess sludge minimization. The reactor was intermittently fed with a synthetic wastewater having a COD concentration of approximately 300 mg/L and no SS. Results of the experiments showed that the F/M ratio in the reactor decreased to a minimum value of 0.02 g COD/g MLSS-day as the MLSS concentration increased to a maximum value of 31,010 mg/L. However, the measured endogenous decay coefficients and oxygen uptake rates of the MLSS confirmed that the activity of the MLSS decreased as the MLSS concentration increased. Based on the increase of MLSS in the reactor and the mass balance during the whole experimental period, the average microorganism yield coefficients were computed to be low values of 0.148 and 0.139 g MLSS/g COD, respectively. These results indicate that the nonwoven fabric filter bioreactor employed in this research is effective for minimization of excess sludge production.

• Journal of Environmental Health Sciences
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• v.26 no.4
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• pp.82-87
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• 2000

생물학적 슬러지를 대상으로 간헐포기 소화와 호기성 소화의 회분실험을 실시하였다. 생물학적 슬러지의 간헐포기 및 호기성 소화 초기단계에서 미생물의 감량은 주로 내생 호흡에 의해 이루어졌다. 이 단계에서 질소는 곧바로 용출되지 않고 슬러지내에 잔존함으로서 슬러지의 질소함량은 일시적으로 증가한다. 그러나 소화후반에서는 최초의 질소함량수준으로 다시 감소하였다. 34일간의 회분식 소화에서 호기성 소화의 총질소 제거효율은 0.1%로서 거의 제거가 안된 반면, 포기 비율 0.25, 05 및 0.75인 간헐포기 소화에서는 각각 42.7%, 42.5% 및 17.6%로 나타나 간헐포기 소화가 호기성 소화보다 질소 제거측면에서 우수하였다. VSS의 감소에 따라 슬러지내의 인도 수중으로 용출하였으나, 인 용출율은 VSS 감소율 보다 훨씬 낮았고 그 결과 소화슬러지의 인 함량은 지속적으로 증가하였다. 호기성 소화와 간헐포기 소화는 소화슬러지의 인 함량이 증가하는 공정이므로 반송수의 인 부하는 상대적으로 낮아지게 되고 이는 하수의 영양염류 제거측면에서 긍정적인 효과를 미칠 것으로 기대된다.

• Journal of Korean Society of Water and Wastewater
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• v.17 no.4
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• pp.559-566
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• 2003

From this research, the performances of a sludge reduction in the sewage sludge aerobic digestion was experimented by using a sludge pretreatment and membrane bioreactor. The submerged plate membrane was used as the solid-liquid separation membrane. After drawing small amounts of sludge in a bioreactor and then doing the alkaline treatment and ozone treatment, the sludge was sent to back to the reactor. The HRT in the reactor was set as 5 days and the operation in the reactor was carried out at the DO of 1mg/L on average. After 100 days of operation in the reactor, it was shown that the reduction efficiency of total solids was more than 83%. Most of volatile solids were removed through mineralization, and the considerable portion of the non-volatile solids was dissolved and then flowed out with the effluent. Only about 16.3% of total solids in the sludge was accmulated in the reactor even without the loss of volatile fraction. Also, by deriving nitrification and denitrification in one reactor simultaneously, more than 90% of nitrogen removal effect was realized and the experiment was run smoothly without fouling of membrane, even in the high concentration of MLSS. Based on this experiment, sludge can be reduced considerably at a low HRT by these two newly suggested approach.

• Proceedings of the Membrane Society of Korea Conference
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• 2005.07a
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• pp.13-34
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• 2005

• Construction Engineering and Management
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• v.11 no.4
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• pp.26-29
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• 2010

• The Science & Technology
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• v.35 no.7 s.398
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• pp.37-37
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• 2002

• Environmental engineer
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• v.24 s.256
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• pp.56-60
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• 2007

• Journal of the Korea Organic Resources Recycling Association
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• v.27 no.4
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• pp.43-49
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• 2019

In order to investigate the relation between sewage sludge solubilization and extracellular polymeric substances(EPS) during alkaline-ultrasonic pretreatment, SCOD/TCOD ratio, solubilization rate, VSS/TS ratio, VSS reduction rate, LB-EPS(Loosely-Bound EPS) and TB-EPS(Tightly-Bound EPS) were measured. At the condition of TS 1.0% and pH 12, solubilization rate increased by 27.7%, LB-EPS as Carbohydrate and Protein increased by 14.6 and 13.3 mg/L/g TS, respectively. Withal, VSS decreased by 26.7% and TB-EPS as Carbohydrate and Protein were extracted by 15.7 and 21.9 mg/L/g TS, respectively. Consequently, the concentrations of organic matter and LB-EPS increased and the trends appeared similarly. In addition, the concentrations trend of decreasing solid matter and extracted TB-EPS also appeared similarly.