유가공 폐수의 활성슬러지 처리에서 벌킹 제어용 염소가 미생물의 유기물 분해 활성에 미치는 영향

남세용,최진택,Nam Se-Yong,Choi Jin-Taek 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.1

Chlorination inhibition on the organic removal activity of activated sludge microorganism was investigated in this study. It is well known that chlorination improves the settleability of filamentous bulking sludge through the selective impediment of filamentous microorganisms. However, it is based on the declination of effluent water quality after actual chlorination in dairy wastewater treatment plant. In case of the activated sludge which was exposed in the suggested concentration of chlorine $7.5\;mgCl_2/gVSS/day$ for the filamentous bulking control, decrease of organic uptake rate of $4.9\~24.0\%$, and dentrification rate of $24.8\~30.3\%$ ware shown in comparison to the control group which was not reacted with chlorine. As a result of comparing floc size of activated sludge microorganism, the average of floc diameter in the chlorine exposed group was $150\;{\mu}m$, which displays $25\%$ decrease compared with the control group.

무기개량제를 이용한 하수슬러지의 탈수능 개선

남세용(Se Yong Nam),김정호(Jeong Ho Kim),김상현(Sang Hyoun Kim) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.10

본 연구에서는 천연 무기소재로부터 합성된 무기개량제의 슬러지 탈수능 개선 효과를 상용 유기고분자응집제와 비교 평가하였다. 2.0 mg/g sludge TS의 주입량에서 무기개량제는 여과시간, 여과비저항계수, 탈수케이크 함수율, 탁도를 각각 146에서 41초로, 8.3×1014에서 2.4×1014m/kg로, 82.1에서 77.1%로, 112에서 61.1 NTU로 향상시켰으며, 이는 상용 양이온 유기고분자 응집제에 필적하는 성능이었다. 따라서 무기개량제를 하수슬러지의 대체 개량제로서 활용 가능할 것으로 판단된다. 각 탈수능 성능지표 간의 상호 관계를 분석한 결과, 여과시간, 여과비저항계수, 탈수케이크 함수율 간에 강한 상호관계가 확인되었다. This study aimed to investigate the effect of an inorganic conditioner composed of natural inorganic materials on the dewaterbility of sewage sludge and compare the performance with those of conventional organic polymeric conditioners. A dosage of 2.0mg inorganic conditioner/g sludge TS decreased time to filter test (TTF), specific resistance to filtration (SRF), water content of dewatered sludge cake, turbidity from 146 to 41 sec, from 8.3×1014 to 2.4×1014 m/kg, from 82.1 to 77.1%, from 112 to 61.1 NTU, respectively, which was compatible to the conventional cation organic polymer. An inorganic conditioner would be used in sewage sludge treatment as a suitable alternative conditioner. Regression analysis showed a strong relationship among TTF, SRF, and water content.

접촉조 결합형 연속회분식반응조를 이용한 질소제거

남세용(Se Yong Nam),이상민(Sang Min Lee),김동욱(Dong Wook Kim),서용찬(Yong Chan Seo) 大韓環境工學會 2005 대한환경공학회지 Vol.27 No.11

활성슬러지 미생물의 탈질 활성에 대한 염소의 저해

최진택,남세용,Choi, Jin-Taek,Nam, Se-Yong 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.4

Chlorine inhibition on the denitrifing activity of activated sludge treating dairy wastewater was investigated in this study. Filamentous bulking was caused artificially by a sudden load of feed and monitored by measuring sludge volume index. In cases of the activated sludge and bulking sludge which were contacted with chlorine as $7.5\;mgCl_2/gVSS/day$ for bulking control, the decreases of specific denitrification of $32.2{\sim}40.4%\;and\;43.5{\sim}46.5%$ were shown in comparison to the control group which was not reacted with chlorine, respectively. In continuous operation, it was observed that the removal efficiency of total nitrogen was more susceptible to chlorine than the removal efficiency of total phosphorus.

Fe(II)/Na₂S₂O₈을 이용한 하수슬러지 탈수능 개선

한준혁,남세용,Han, Jun-Hyuk,Nam, Se-Yong 유기성자원학회 2022 유기물자원화 Vol.30 No.3

In order to investigate the degree of sewage sludge dewaterability using Fe(II)/Na₂S₂O₈, STTF, SCST, water content, TS, VS, TB-EPS as carbohydrate and Protein were measured. The dosage of Na₂S₂O₈ was varied from 0.4 to 0.7 mmol/gVS and molar ratio of Fe(II)/Na₂S₂O₈ was varied from 0.5 to 0.7 mol/mol. According to the increase of the dosage of Na₂S₂O₈ and Fe(II)/Na₂S₂O₈ molar ratio, STTF and SCST increased from 1.00 to 15.00 and 4.51, respectively. Water content decreased to 82.6%. TB-EPS as carbohydrate and protein decreasing rate also increased to 37.16% and 57.34%, respectively. Especially, Na₂S₂O₈ 0.6 mmol/gVS and Fe(II)/Na₂S₂O₈ 0.6 mol/mol condition, water content dercreased to 83.1%, STTF and SCST increased to 13.64 and 4.19 which showed the cost effective improvement of dewaterability. It is considered that SO₄^- radical generated by Fe(II)/Na₂S₂O₈ degraded EPS and converted bound water to free water.

인천 H항 표층 퇴적물의 오염도 평가

김정호,남세용,Kim, Jeong-Ho,Nam, Se-Yong 해양환경안전학회 2014 해양환경안전학회지 Vol.20 No.5

본 연구에서는 2014년 03월에 인천 H항의 5개 정점(S1~S5)에서 채취된 표층 퇴적물의 물리화학적 특성을 조사하고, COD, AVS, IL 및 중금속(Cd, Cu, Ni, Pb, Zn, Cr, Hg)을 분석하여 오염도를 평가하였다. 입도분석, 비표면적분석, XRD 및 XRF 분석을 통하여 채취된 퇴적물 시료 모두 거의 동일한 산화물과 광물로 구성되었음을 확인하였다. 국내기준으로 COD, AVS 및 IL 세 항목의 총점에 대한 오염도는 S2, S3, S5 지점은 2등급으로 S1, S4 지점은 3등급으로 평가되었다. 중금속 오염의 경우 Cd, Ni, Pb은 USEPA 기준으로 중간오염에 해당하였고, Cu, Zn 및 Cr은 심한오염으로 분류되었다. 농집지수를 이용한 오염도 평가결과 Cd가 Class 3으로 평가되었고, 농축계수를 이용한 평가결과 모든 지점에서 Cd, Pb, Zn의 경우 1보다 큰 것으로 나타났다. 또한 총농축계수는 S4지점이 3.1로 가장 높은 것으로 나타났다. In this study, physico-chemical properties and pollution degree of surface sediments collected at 5 stations(S1~S5) of Incheon H wharf in March 2014 were investigated. From particle size, surface area, XRD and XRF analyses, the sediment samples consisted of similar oxides and minerals. Considering total score of COD, AVS and IL, pollution level ranged between 2 and 3 based on domestic standards. In case of heavy metal contamination, Cd, Ni and Pb were classified as moderately polluted by USEPA standards. However, Cu, Zn and Cr were classified as heavily polluted. With geoaccumulation index value($I_{geo}$), Cd contamination was estimated as class 3. In addition, the calculated enrichment factors of Cd, Pb and Zn were exceeded a value of 1. Site S4 was high as 3.1 in total enrichment factor.

무기개량제를 이용한 소화 및 농축슬러지의 개량 및 탈수 특성

김정호,남세용,Kim, Jeong-Ho,Nam, Se-Yong 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.6

Objectives: Wastewater treatment plants typically produce a large volume of waste sludge. In this study, the conditioning and dewatering properties of a digested and thickened sludge from an industrial wastewater treatment plant were investigated in order to improve the dewaterbility of the sludge. Methods: Jar-tests and Buchner funnel tests were carried out to assess the conditioning and dewatering properties of a waste sludge. TTF (Time to Filter Test) and SRF (Specific Resistance to Filtration) were adopted as the indices of sludge dewaterbility. Results: The valuation indices influencing the dewaterbility of the waste sludge, including TTF, SRF, water contents, VS/TS ratio and turbidity, were measured. The TTF and SRF of the digested and thickened sludge were decreased to 40 sec, $3.43{\times}10^{12}$ m/kg, and 39 sec, $1.09{\times}10^{12}$ m/kg, respectively. Conclusions: The conditioner composed of natural inorganic materials turned out to be effective in the reduction of sludge water contents.

초음파/과산화칼슘(US/CaO2)을 이용한 하수슬러지 가용화

한준혁(Jun-Hyuk Han),남세용(Se-Yong Nam) 유기성자원학회 2021 유기물자원화 Vol.29 No.4

초음파/과산화칼슘 처리(US/CaO2)에 따른 하수슬러지의 가용화 정도를 확인하고자 과산화칼슘의 주입량 (0.01, 0.02, 0.03, 0.04 및 0.05 g CaO2/g VSS)에 따른 처리 효율을 비교하였다. 가용화의 주요 지표인 VSS 감량화율, 가용화율, SCOD/VSS, SCOD 증가속도 및 미생물의 세포벽이 파쇄되었는지 확인하기 위하여 LB-EPS와 TB-EPS를 측정하였다. 실험결과, US/CaO2(0.05 g CaO2/g VSS) 조건에서 가용화율은 50.7%로 US 처리(23.4%)보다 높은 효율을 나타내었으며, VSS 감량화율도 US/CaO2(0.05 g CaO2/g VSS) 조건에서 17.7%, US 조건에서는 7.1%로 가용화율과 유사한 경향을 나타내었다. 조사시간 10분부터 90분까지 SCOD의 증가속도는 US/CaO2(0.02 g CaO2/g VSS) 조건에서 0.0151 min-1으로 가장 빠른 속도를 나타내었다. TB-EPS는 US/CaO2(0.05 g CaO2/g VSS)조건에서 59.0%, US 조건에서 36.4% 감소하였다. TB-EPS는 초기 10분동안 빠르게 감소하였으며, 이후부터 상대적으로 완만하게 줄어드는 것을 확인할 수 있었다. 과산화칼슘의 주입량에 따른 TB-EPS의 감소량은 큰 차이가 없는 것으로 나타났다. In order to investigate the degree of sewage sludge solubilizaion using ultrasonic(US) combined with calcium peroxide(CaO2), VSS reduction rate, solubilization rate, SCOD/VSS ratio, SCOD increasing rate, LB-EPS(Loosely-Bound EPS) and TB-EPS(Tightly-bound EPS) were measured. US was compared as a control. Solubilization rate increased by 23.4% under US and increased by 50.7% under US/CaO2(0.05 g CaO2/g VSS). and also, at the same conditions, VSS reduction rate increased by 7.1% and 17.7%, respectively. SCOD increasing rate from 10 to 90 minutes was 0.0151 min-1 under US/CaO2(0.02 g CaO2/g VSS). TB-EPS decreased by 36.4% under US and decreased by 59.0% under US/CaO2(0.05 g CaO2/g VSS). TB-EPS decreased during first 10 minutes and then decreased slowly until 90 minutes. There was no significant difference in TB-EPS decrease according to the dosage of calcium peroxide.

국내 하수처리장 운영 실태 및 개선 방안

신항식(Hang Sik Shin),남세용(Se Yong Nam),강석태(Seok Tae Kang),이상형(Sang Hyung Lee) 한국수처리학회 2000 한국수처리학회지 Vol.8 No.3

The volume of sewage increases as the population grows and the standard of living rises, that varies in proportion to the volume of available water supply. As of 1998, the sewage treatment ratio is 66%, and 114 sewage treatment facilities are under operation. While sewage treatment plant has been constructed in large cities and heavily industrialized cities, mostly activated sludge process is employed, which may not be always desirable for some cities in economical point of view and process optimization. Moreover, poor sewer systems resulted in low organic strength influent than the designed strength. In this study, in an attempt to improve the operation efficiency, several existing sewage treatment plants were evaluated. And some managerial suggestions including privatization were proposed to enhance the efficiency of sewage treatment facility.

활성 과황산염을 이용한 슬러지 가용화

문상재(Sang-Jae Moon),남세용(Se-Yong Nam) 유기성자원학회 2021 유기물자원화 Vol.29 No.3

초음파로 활성화된 과황산염을 이용한 슬러지의 가용화 정도를 확인하기 위하여 VSS 감량화율, 가용화율및 체외고분자물질을 주요 지표로 측정하여 초음파 및 수산화나트륨을 이용한 알칼리⋅초음파 방법과 비교하였다. 과황산염⋅초음파 조건에서 VSS 감량화율은 27.6%, 가용화율은 58.9%로 증가하였고, TB-EPS as Carbohydrate와Protein은 각각 770 ㎎/L, 2,162 ㎎/L 용출되었다. 초음파 및 알칼리⋅초음파 방법에 비하여 VSS감량화율 및 가용화율이높았으며, TB-EPS지표로 볼 때 세포의 파괴 및 용출에서도 과황산염⋅초음파 조건에서 더 효율적이었다. In order to investigate the degree of solubilization of sewage sludge using sono-activated persulfate(UV/PP), VSS reduction rate, solubilization rate and extracellular polymeric substances were measured. Ultrasonic(US) and alkali⋅ ultrasonic method using sodium hydroxide(US/SH) were compared. Under the persulfate⋅ultrasonic conditions, the VSS reduction rate and the solubilization rate increased to 27.6% and 58.9%, respectively. TB-EPS as Carbohydrate and Protein were extracted by 770 mg/L and 2,162 mg/L. Compared to the other methods, US and US/SH, the VSS reduction rate and solubilization rate were higher. And also, according to the TB-EPS values, cell wall destruction was more efficient.