• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.558-559
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• 2001

생물학적 폐수처리 (biological treatment)의 슬러지의 활성도 측정을 위하여 슬러지의 대사 열을 측정하는 장치와 소프트웨어를 개발하였다. 슬러지의 활성을 측정하는 호흡계와 같이 간헐식으로 폭기와 침전을 반복하연서 슬러지의 대사열의 monitoring 을 통하여 슬러지의 활 성진단올 할 수 있었다.

• Proceedings of the Membrane Society of Korea Conference
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• 1991.10a
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• pp.41-42
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• 1991

본 연구는 활성슬러지공법의 침전조를 막으로 대체하여 고액분리를 효과적으로 수행하도록 하는 막분리 활성슬러지 공법에 관한 것이다. 이와같은 방법은 공정자체가 간략화되는 동시에 종래법에서 슬러지 팽화(bulking)등에 의해 침전조에서 SS carry-over, 슬러지 침강성 향상을 위한 고부하처리의 곤란성, 침전조 처리수에의 SS 유출등 고액 분리의 문제점을 해소하므로, 여과, 응집침전, 혹은 활성탄흡착등의 고도처리설비없이 양질이 처리수를 얻을 수 있다고 보고 되고 있다.

• KSBB Journal
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• v.11 no.5
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• pp.577-585
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• 1996

Effects of various factors on the phenol degradation by activated sludge immobilized with the photo-crosslinked resin were investigated. The optimum pH on the degradation of phenol in both free and immobilized activated sludge was 7. When the pH of the reaction was varied from 5 to 10, the relative activity of the phenol degradation by the immobilized activated sludge was higher than that by the free activated sludge. A higher rate of phenol degradation was observed when a bead size was smaller. The phenol degradation in the free activated sludge was inhibited at the 3000 mg/L of phenol, while that in the immobilized activated sludge was maintained at the same concentration for 28 hrs without an inhibition. The degradation rates of phenol were not directly proportional to the increasing amount of immobilized beads dosage, but the phenol degradation was made in a rather short time than that for a free sludge system. The relative activities of the immobilized activated sludge after 7 runs of repeated reactions increased about 8 times as that of the first reaction. The activities for the phenol degradation remained stable for at least 80 days when the immobilized activated sludge was stored at an aerobic condition in the wastewater containing phenol. The loading rate as high as 5.59 kg-pheno1/㎥.d could have been achieved during the continuous treatment of phenol by the immobilized activated sludge.

• 한국생물공학회:학술대회논문집
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• 2002.04a
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• pp.431-434
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• 2002

Effect of various factors on the phenol degradation by activated sludge immobilized with the photocrosslinked resin were investigated. The optimum pH on the degradation of phenol in both free and immobilized activated sludge was 7. A higher rate of phenol degradation was observed when a bead size, vas smaller. The phenol degradation in the free activated sludge was inhibited at the 3000 mg/L of phenol, while that in the immobilized activated sludge was maintained at the same concentration for 28 hrs without an inhibition.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.777-780
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• 2008

There were some attempt to reuse water with sludge combinative water for ready mixed concrete. But recycling water consist of cement, aggregate and chemical admixture. So it caused deterioration of concrete. The object of this study was to search for recycling method of the recycling water sludge as mineral admixture. This experiment dealed with the effect of $2.5{\sim}12.5$% range of the recycling sludge which can be used for admixture binder(BFS, FA, BFS+FA) on properties of activated recycling water sludge for admixture of concrete. As a result, Although the slump levels reduced and air contents increased as sludge replacement levels increased, it didn't change highly. The compression strength of concrete slightly increased with an increasing amount of recycling water sludge replacement.

• Microbiology and Biotechnology Letters
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• v.16 no.5
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• pp.374-378
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• 1988

Treatability and maximum no inhibitory effect concentration of benzene were measured in the synthetic wastewater medium by the activated sludge in the continuous activated sludge reactor. The maximum no inhibitory effect concentration was 1, 600mg per liter. Benzene concentration over 500mg per liter inhibited the growth of microorganims by the measurment of E/BOD, and the treatability of benzene at the maximum no inhibitory effect concentration was over 95%.

• Applied Biological Chemistry
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• v.45 no.1
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• pp.25-29
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• 2002

The kernel of wastewater treatment by activated sludge is elimination of organic substances and maintenance of well-flocculated sludge sedimentation. By the conventional activated sludge treatment, the optimum F/M ratio of soybean wastewater treatment was 0.24 (kg-BOD/kg-MLVSS day) and sludge bulking was generated at 0.48 (kg-BOD/kg-MLVSS day). To improve the treatment capacity and operation quality in higher loading of soybean wastewater, influent pH was constantly controlled by 9.0 using NaOH as a coagulant agent. In this process, higher loading up to 2.88 (kg-BOD/kg-MLVSS day) was possible and SVI was maintained under 150 without bulking. This was equivalent to 7.2 times higher than maximum permissible load of the conventional activated sludge process.

• Economic and Environmental Geology
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• v.38 no.5 s.174
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• pp.579-585
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• 2005

Cheap and environmental sound biosorbent was made for the adsorption of arsenate using an waste activated sludge. The biosorbents were methylated in 9hours and 24 hours respectively for the better adsorption of arsenate. The amount adsorbed of arsenate(V) increased with increasing methylation time. The specific arsenate adsorption was 0.06mmol As(V)/g biomass when the biosorbent was methylated in 24 hours. The methylated biosorbents were also studied with pH 5, 7 and 9. The pH of the solution affect the amount of adsorption of arsenate of the biosorbent even though it was methylated. The specific arsenate adsorption of the biosorbent at pH 5 was best and it was three times greater than the amount of arsenate adsorbed at pH 9.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.8 no.1
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• pp.69-75
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• 1988

Two rational formulae depicting the relationships between sludge ages and recycle flow rates have been developed to determine sludge wasting volumes at a particular sludge age. A sensitivity analysis shows that the recycle ratio is the most important variable to be measured as accurately as possible in determining the sludge wasting volume to maintain a particular sludge age when the system is controlled by wasting recycled sludge. On the other hand, the final clarifier solids capturing capacity is the most important variable to be measured when the system is operated by wasting mixed liquor.

• Microbiology and Biotechnology Letters
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• v.32 no.2
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• pp.158-165
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• 2004

This study concerns the succession process of protozoa populations in two activated sludge pilot plants. Protozoa populations with similar structures developed and succeeded each other in two plants. It was observed that initial sludge inoculum did not influence the protozoan composition but shorten the period of the plant stabilization. It seemed the protozoan in aeration tank was come from the influent. The composition of the influent sewage influenced the structure of protozoa in the pilot plants. The flagellates was very abundant during the initial starting phase. These rapidly decreased after growth peak. Then sarcodina, ciliates were increased in succession. In ciliates, free-swimming forms appeared at first and crawling forms and stalked forms were followed. After 36 days from the start, the sludge stabilization phase was characterized by a populations of ciliates dominated by stalked and crawling type and low value of effluent BOD was achieved.