화학세정약품 대체물질의 황화수소 제거 성능 비교

장현섭,주현우 한국냄새환경학회 2023 실내환경 및 냄새 학회지 Vol.22 No.4

In this study, the hydrogen sulfide removal performance of materials that can be used instead of NaOH was evaluated to reduce the amount of NaOH, a harmful substance used in chemical cleaning methods. Three alternative chemical agents were evaluated: commercially available chemical-based CB, enzyme-based EB, and natural substance-based NB. The hydrogen sulfide removal performance evaluation consisted of three lab tests: the EL608 method, a method using a bag, a method using a sensor and a chamber, and a field test conducted on a scrubber in operation in the actual field. As a result of evaluation by the EL608 Method, CB was 92.3% (±2.9%), EB 60.5% (±5.8%), and NB 88.3% (±3.6%), similar or somewhat similar to NaOH (5%) 99.8% (0.1%). In the evaluation of the hydrogen sulfide removal performance using Bag, the Michaelis-Menten coefficient was CB 4.30 and EB 5.30, lower than NaOH 6.60, and the affinity for hydrogen sulfide was evaluated to be stronger. Even in the method using the sensor and chamber, CB and EB showed similar hydrogen sulfide removal performance of NaOH, but NB showed low treatment performance. In the evaluation using the scrubber in the actual field, the treatment efficiency of CB and EB was higher than that of NaOH under all hydrogen sulfide inlet concentration conditions. If microorganisms grow on the packing material filled inside the scrubber, treatment efficiency may decrease. In order to prevent this phenomenon, the microbial growth inhibitory function of alternative materials was evaluated, and CB, EB, and NB were all superior to NaOH. As a result of this study, it was shown that CB and EB can replace NaOH because they have excellent performance in removing hydrogen sulfide and inhibiting microbial growth.

휘발성유기화합물 제거를 위한 생물공정기에서 분리한 톨루엔 분해 세균

장현섭,황선진,조영철 경희대학교 2005 環境硏究 論文集 Vol.14 No.-

We isolated a toluene degrading bacterium from the bioactive foam reactor(BFR) which designed to remove volatile organic compounds(VOCs) from the contaminated air. In order tofind the taxonomic and phylogenetic relationship with known bacteria, the partial sequence of 16S ribosomal DNA gene was analyzed. The isolated bacterium was classified as Pseudomonas sp. based on the close relationship to bacteria belonging to this genus. From the sequence, we designed the appropriate DNA probe which will be useful to detect this bacterium with the molecular methods such as FISH. The isolated bacterium and designed probe will be helpful to optimize the operating conditions and to improve the efficiency of BFR in detoxification of VOCs.

혐기성 소화시 온도와 기질 농도에 따른 소화특성과 미생물상 변동에 관한 연구

장현섭,황선진 한국폐기물자원순환학회(구 한국폐기물학회) 2003 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2003 No.-

현대 한국인의 상례관행과 개선방향

장현섭 한국가족학회 1996 家族學 論集 Vol.8 No.-

혐기성 소화시 온도와 기질 부하에 따른 메타생성균 거동에 관한 연구

장현섭,황선진 경희대학교 2003 環境硏究 論文集 Vol.12 No.-

Anaerobic digestion is a biological treatment process that has many advantages over the more conventional aerobic processes including low levels of excess sludge production, low space requirements and the production of valuable bigots. this study was carried out to evaluate the effect of organic loading rate on thermophilic(55℃) and mesophilic(35℃) anaerobic digestion. Moreover, fluorescent in situ hybridization(FISH) method was used for studying the microbial community it the reactors. The results of this study was as follows ; The stabilizing time of mesophiwic anaerobic reactors were shorter as approximately 20 days than 40 days of the thennrophiwic anaerobic reactors. The methane production of anaerobic reactors were independent of the feed substrate concentration and methanogens. The microbial diversity of two types of methanogenic reactor, mesophiwic (35℃) and thermophiwic (55℃), which had beet treating acetate-based artificial wastewater were compared. Methanogensis is carried out by microbial consortia consisting of bacteria and archer such as methanogens. the bacterial and archaic populations of all anaerobic reactors were investigated during a period of the process reflected by at accumulation of acetate. Archaea wore predominant it all reactors, and methanothrix-wike methanogens appeared it the mesophiwic anaerobic reactors with high feed substrate concentrations but it was tot preset it thermophiwic anaerobic reactors.

생물학적 질소제거시 운전조건의 변화가 N₂O 발생에 미치는 영향

장현섭,김태형,이명주,황선진,Jang, Hyun-Sup,Kim, Tae-Hyeong,Lee, Myoung-Joo,Hwang, Sun-Jin 대한상하수도학회 2009 상하수도학회지 Vol.23 No.5

The objectives of this research were focused on the effects of various operating parameters on nitrous oxide emission such as C/N ratio, ammonia concentration and HRT in the hybrid and suspension reactors. With the decreasing of C/N ratios, $N_2O$ emission rates in the both processes were increased because organic carbon source for denitrification was depleted. In case of biofilm reactor operated using medium, $N_2O$ release from the nitrification was not affected by the variation of ammonia concentration. But in the suspension reactor, $N_2O$ production from the nitrification was rapidly increased with the increase of ammonia. Nitrite accumulation caused by undesirable nitrification conditions could be a important reason for the increase in the $N_2O$ production from the aerobic reactor. And rapid increase in $N_2O$ production was reflected by the decrease of HRT, similar to the results observed in the results of ammonia loading changes. So it could be said that it is very important to put in consideration both its optimum conditions for wastewater treatment efficiency and suitable conditions for $N_2O$ diminish, simultaneously, in order to development an eco-friendly and advanced wastewater treatment, especially in BNR process.

원자력 안전 규제의 개혁 -추진 현황과 향후 과제-

장현섭 한국원자력산업회의 1998 원자력산업 Vol.18 No.12

공공하수처리장 침사지의 악취 배출계수 산정

장현섭,김성태,이종국,오남승,송지현 한국냄새환경학회 2017 실내환경 및 냄새 학회지 Vol.16 No.4

Odor emission factors (OEFs) are important parameters in characterizing odor sources, understanding emission patterns, designing abatement facilities, and providing appropriate control methods. In this study, OEFs for complex odor from grit removal chambers in publicly-owned wastewater treatment plants were determined, and the major operating conditions affecting the emission factors were investigated. In the main study site of “S” wastewater treatment plant, the averaged OEFs from the grit chamber were found to be 466.2, 162.6, and 54.7 OU/m2/min in summer, spring, and winter, respectively. OEFs from two other grit chambers in different wastewater plants were independently measured for comparison, and the values were in the same range as the OEF from S-site at a 95% confidence level. Nevertheless, the OEFs could differ depending on the types of wastewater and the sizes of wastewater treatment plants. Using the multi-variable linear regression method, correlations between OEFs and operating conditions, i.e. activities, from grit chambers were statistically analyzed. The analyses showed that operating conditions, including total suspended solids, water temperature, and temperature difference between water and air, were the most significant parameters affecting the OEF. A linear equation using these three parameters was proposed to estimate the OEF, and can be used to predict an OEF for another grit chamber, without odor measurement.

제3세대의 가족연구를 위한 시론(1): 연구시각에 대한 이론적 논의

장현섭 연세대학교 사회발전연구소 1987 연세사회학 Vol.8 No.-

Yeast에 의한 휘발성 유기화합물 분해에 있어서의 기질상호관계 해석

장현섭,신승규,송지현,황선진,정미영 대한상하수도학회 2008 상하수도학회지 Vol.22 No.2

Biological removal capacities for volatile organic compounds (VOCs) were determined using a yeast strain, Candida tropicalis. In this study, VOCs including toluene, benzene, p-xylene, and styrene as single substrates or mixtures were tested in the batch culture of the yeast strain. In addition, a kinetic model was applied to evaluate substrate interactions between the VOCs. The yeast strain was able to biodegrade each VOC effectively as a growth substrate, implying it could applied to wide range of VOCs. When the yeast strain was subjected to VOCs in mixtures, the biodegradation rate of one substrate were either increased (stimulated) or decreased (inhibited) by the presence of the others. Both benzene and toluene were inhibited by the other VOCs, and substrate interaction parameters estimated in the model indicated that styrene was the strongest inhibitor for the benzene and toluene biodegradation. Meanwhile, the biodegradation of p-xylene and styrene was stimulated by the presence of either benzene or toluene. The biodegradation rate of p-xylene was significantly increased especially by the presence of toluene, and the styrene biodegradation was enhanced greatly by the benzene addition. The results of the substrate interaction by the yeast strain suggest that the biodegradation rates for the VOCs in mixtures should be carefully evaluated. Furthermore, the competitive inhibition coefficient could be applied as a useful index to determine the substrate interaction