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- 저자 : 신항식 ( Hang Sik Shin ) (검색결과 225 건)
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신항식,배병욱,백병천,Shin, Hang Sik,Bae, Byung Uk,Paik, Byung Cheon 대한토목학회 1990 대한토목학회논문집 Vol.10 No.4
본 연구에서는 주정폐액의 고율처리를 위하여 이상 UASB 공정을 시험하였다. 상분리는 반응조의 pH를 조절하므로써 가능하였다. 유입폐수의 SS 농도가 4.1g/l일 때 산형성조는 유기부하 16.5kg $COD/m^3.day$까지 운전이 가능하였고, 이때 산생성율은 3.9g HAc/l.day를 나타내었다. 메탄형성조는 유기부하 44kg $COD/m^3.day$까지 운전이 가능하였으며, 이때 COD 제거율은 80%이었고 비가스 생성율은 16.51/l.day이었다. 두 반응조에서 입상슬러지가 형성된 이후에는 알칼리도의 주입없이 메탄조유출수의 재순환으로 산형성조의 pH를 적절하게 유지할 수 있었다. A two-phase UASB system was operated for high-rate treatment of concentrated distillery wastewater. The phase separation was obtained by adjusting pH in each reactor. When influent SS concentration was 4.1/g/l, the first phase UASB reactor was effectively operated up to the loading rate of 16.5kg $COD/m^3.day$, producing 3.9g HAc/l.day. In the methanogenic UASB reactor, loading rate up to 44kg $COD/m^3.day$ could be applied while removing 80% of influent COD with a specific gas production of 16.5 l/l. day. After the formation granular sludge in both reactors, it was possible to maintain the appropriate pH in the first phase only by recirculating the effluent from methanogenic phase without the addition of alkaline chemicals.
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신항식,임경호,이의신,최계운 ( Hang Sik Shin,Kyeong Ho Lim,Eui Sin Lee,Gye Woon Choi ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.4
Biofilm system is suitable for the pretreatment of water because biofilm can act as niches where slow-growing degraders can survive at low organic concentrations. In order to cope with stringent environmental standards, it became essential to improve the understanding of the phenomena governing biological degradation of organics. In this study, effects of hydraulic retention time (HRT) and temperature on the efficiency of submerged biofilm reactors were investigated. Removal efficiency total organic carbon (TOC), turbidity, and algae increased with the HRT. It is considered that over 1 hr HRT is needed to ensure the removal of higher than 30% TOC. In comparison to honey comb type media, fibrous media were more favorable to the attachment and growth of active microorganisms. The close relationship with chlorophyll-a concentration and particulate organic carbon (POC) concentration make POC a surrogate parameter for estimating the removal efficiency of algae.
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신항식,임경호 ( Hang Sik Shin,Kyeong Ho Lim ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.2
In this study, organic stabilization and nitrogen removal were investigated using a household-type hollow fiber membrane separation bioreactor of 1.9L volume. The process employed direct solid-liquid separation by the hollow fiber membrane module and an aeration tank. There was a distinct effect of solid content on the membrane flux. The steady water flux decreased as MLSS concentration increased from 3,500 to 13,300㎎/ℓ. The reduction of influent COD aver 95% was obtained in the system without sludge wastage. However, by-products of cell degradation could accumulate and have adverse effect in the biological reactor if sludge was not wasted. SS was completely removed from the effluent so that clean effluent could be obtained by the membrane bioreactor. Enteric bacteric such as E. coli was not detected in the effluent. By the ultrafiltration membrane bioreactor, TKN was removed up to 90% or more by simultaneous nitrification and aerobic denitrification. Endogenous denitrification rate of 0.0139g NO₃-N/g VSS.day was observed.
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Solidification of Hazardous Wastes from Electroplating Industry
신항식,허남룡,구자공,Shin, Hang Sik,Her, Nam Ryoung,Koo, Ja Kong Korean Society of Civil Engeneers 1988 대한토목학회논문집 Vol.8 No.2
본 연구는 도금공장에서 생산된 슬러지를 시멘트 고형화방법을 이용하여 처리할 때 고형화에 영향을 미치는 인자들 중에 모래/시멘트 비, 물시멘트 비, 젖은 슬러지의 양, 그리고 중금속 용출방지제를 네가지의 인자로 하여 압축강도와 용출량의 변화를 살펴 보았다. 모래/시멘트 비는 Cr(VI) 용출에 가장 큰 영향을 미치는 인자이며, 물/시멘트 비는 Zn와 압축강도에 가장 큰 영향을 미치는 인자였다. Cr(VI)는 Zn보다 시멘트 고형화에서 leachability가 더 적었다. 현장에서의 Cr(VI)과 Zn 그리고 압축강도를 예측하기 위한 모델을 계발하였으며, 고체화의 3급 Brick으로의 이용을 위해 혼합조건을 제시하였다. 그리고 30g의 건조슬러지를 고형화할 때 최적조건은 모래/시멘트 비, 물/시멘트 비, 그리고 중금속 용출방지제의 양은 각각 1, 1.5, 1.075g이었다. This research evaluated factors on cement-based solidification process designed for hazardous sludge produced from electroplating industry. Four factors of sand/cement ratio, water/cement ratio, amount of wet sludge and amount of a precipitator, were investigated in terms of leachability and compressive strength of the solidified materials. Results of triplicate tests and statistical analysis indicated that sand/cement ratio(S/C) had the greatest effect on leaching of Cr(VI) from the solidified materials while water/cement ratio(W/C) on Zn and compressive strength. Cr(VI) was fixed better than Zn by portland cement. An experimental modeing was developed to estimate leached metal concentration and compressive strength at a given condition. Proper mixing criteria were also suggested for the use of the solidified mixture as construction materials. In solidification of 30g dry sludge, optimal condition was studied for S/C ratio, W/C ratio and the weight of precipitator which were 1, 1.5 and 1.075g respectively.
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신항식,배병욱,Shin, Hang-Sik,Bae, Byung-Uk 대한토목학회 1993 대한토목학회논문집 Vol.13 No.4
UASB 반응조를 이용한 옥수수 전분폐수의 처리도를 연속 및 회분식실험으로 조사하였다. 옥수수 전분폐수는 제조공정에 따라 생분해도와 메탄회수율이 달랐다. 유기부하 3.2 kg $COD/m^3{\cdot}day$까지 COD 제거율은 70% 이상으로 유지되었으며, 최대 가스발생량은 부하 8.4 kg $COD/m^3{\cdot}day$에서 약 55 l/day로서 반응조 단위 체적당 약 3.5 l/day의 가스가 발생하였다. 연속실험과 동시에 수행된 회분식(SBT) 실험에 의하면 슬러지의 활성도는 운전 130일이 경과하는 동안 0.03에서 0.53g $COD-CH_4/g\;VSS{\cdot}day$으로 증가하였으며, 슬러지도 입상화되었다. SBT 실험은 처리대상 폐수에 대한 정보 뿐만 아니라, 슬러지의 활성도에 대한 유익한 정보를 제공하였다. 옥수수 전분폐수를 처리하는 과정에서 형성된 입상슬러지의 형태학적 특성은 주정폐수이나 당을 처리한 입상슬러지와 유사하였다. The performance of Upflow Anaerobic Sludge Blanket(UASB) reactor for treatment of corn starch wastewater was investigated using continuous and batch experiment. Results showed that the corn starch wastewater had different characteristics in terms of biodegradability and methane potential, depending on the manufacturing precess. COD removal efficiencies were maintained over 70% up to the loading rate of 3.2 kg $COD/m^3{\cdot}day$ and the maximum gas production rate was about 55 l/day, equivalent to 3.5 l/day per liter of reactor volume, at the loading rate of 8.4 kg $COD/m^3{\cdot}day$. In the anaerobic serum bottle test(SBT) carried out along with continuous operation, the sludge activity was found to increase from 0.03 to 0.53 g $COD-CH_4/g\;VSS{\cdot}day$ as granular sludges were developed in 130 days operation. SBT gave valuable informations on the characteristics of wastewaters to be treated as well as on the sludge activity. The overall morphological characteristics of granular sludges cultivated on corn starch wastewaters were similar to those cultivated on various organic industrial wastewaters such as distillery and sugar.
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신항식,배병욱,백병천,Shin, Hang Sik,Bae, Byung Uk,Paik, Byung Cheon 대한토목학회 1991 대한토목학회논문집 Vol.11 No.2
본 논문에서는 주정폐액을 처리한 이상 UASB 공법에서 형성된 입상슬러지에 관한 현미경실험 결과를 제시하고자 한다. 기질로 사용한 주정폐액의 SS 및 COD 농도는 각각 3.6~10.6, 17.3~30.4g/l였으며, 12.5 l와 4.7 l의 UASB 반응조가 사용되었다. 입상슬러지의 형태학적 연구에는 SEM과 TEM을 사용하였다. 운전 90일과 120일경에 산형성조와 메탄형성조로부터 다른 색깔과 형상을 가진 두 종류의 입상슬러지가 형성되었다. 산형성조 입상슬러지는 주로 긴 고리로 연결된 큰 rod형 bacteria 짧고 통통한 rod형 bacteria, 그리고 다양한 크기의 coccus형 bacteria로 구성되었다. 반면에 메탄조 입상슬러지는 Methanothrix로 구성된 network내에 다양한 종류의 bacteria가 포획되어 있는 구조를 가졌다. In this paper, the microscopic results of granular sludge from the two-phase UASB reactors are presented, particularly on the acidogenic phase where the distillery waste water is directly delivered. Distillery wastewater as a feed contained SS of 3.6~10.6 g/l and COD of 17.3~30.4 g/l. A 12.5 l and a 4.7 l UASB reactors were used for acidogenic and methanogenic phases, repectively. Morphological studies on the granular sludge consortia were made with both scanning and transmission electron microscopies. It was interesting enough to find the different colored and shaped granules at the acidogenic on the 90th day and at the methanogenic phase on the 120th day. The acidogenic granular sludge mainly consisted of acidogenic bacteria, such as long chains of large rods, short plump rods, and various size of cocci. Whereas the filamentous bacteria of Methanothrix spp. prevail in the methanogenic granule, with dirverse bacteria entrapped therein.
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