큰입배스 Micropterus salmoides의 위 내용물 분석을 통한 일산호수 내 큰입배스의 생육상태 및 수생동물의 다양성 간접 평가

김이태(I Tae Kim),박재로(Jae Rho Park),김원재(Weon Jae Kim) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.12

본 연구는 도시 인공호수에서 서식하는 큰입배스 위 내용물 분석을 통해 먹이 다양성에 따른 성장 특성과 수생동물 군집 특성을 조사하였으며 대상호수는 국내에서 가장 큰 도시 인공호수 중 하나인 일산호수에 대하여 실시하였다. 큰입배스의 길이와 무게의 관계에 따라 Zone III(생태 구역)에서의 체중증가속도가 다른 Zone보다 더 빠른 것으로 나타났다. 어류 총 16종 및 9종이 각각 Zone III 및 Zone I, II(인공 구역)에서 관찰되어 Zone III의 어류의 종다양성이 Zone I, II에 비해 높았다. 상대중요성지수(IRI)는 Zone III에서 Zone I, II에 비해 더 다양하였으며, 공복율을 고려할 때 먹이 스트레스는 Zone I, II에서 더 심각한 것으로 나타났다. 어류의 군집분석 결과, 피라미 Zacco platypus가 우점종인 것으로 나타났고, 긴몰개 Squalidus gracilis majimae와 밀어 Rhinogobius brunneus는 Zone III에서만 풍부하게 발견되었다. Zone I, II에서 나타난 먹이종의 낮은 다양성을 고려할 때, 소금쟁이류 Heteroptera와 같은 절지동물문은 Zone I, II에서 Zone III에 비해 큰입배스의 위 속에서 상대 적으로 높은 비율로 관찰되었다. 본 연구에 의해 큰입배스의 위 내용물 분석과 같은 간접적인 평가에 의해 수생동물 군집의 특성을 파악하는 것이 가능한 것으로 나타났다. In this study, through the analysis of the growth condition and prey of the largemouth bass, we tried to understand the characteristics of the aquatic animal community depending on the composition and shape of a artificial lake. The evaluation was conducted for Ilsan lake which is one of the largest urban artificial lakes in Korea. Weight gain rate of the Zone III (eco-zone) was more rapid based on the relationship of length and weight of largemouth bass. Total 16 and 9 species of fish were found in each Zone III and Zone I, II (artificial zones), which represented significantly higher diversity of fish species in Zone III than Zone I, II. Index of relative importance(IRI) was more diverse at Zone III and when considering the hunger rate the food stress was more serious at Zone I, II. the proportion of the population of fish, Zacco platypus revealed to be the dominant species, and Squalidus gracilis majimae and Rhinogobius brunneus inhabited only Zone III naturally rich. On account of low prey species diversity of Zone I, II, the Phylum Arthropoda like Heteroptera showed relatively higher prey ratio in stomach of largemouth bass than that of Zone III. It was possible to figure out aquatic animal community characteristics indirectly through analyzing the stomach contents of largemouth bass.

암모늄염이 메탄산화균의 성장 및 반응 대사 산물, 메탄산화 효소발현, 질소화합물에 미치는 특성 분석

김이태 ( I Tae Kim ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.5

This study analyzed the effect of ammonium salts on the growth of methanotrophs and manifestation of reactive metabolites, nitrogen compounds and enzymes in aerobic water conditions. It was conducted to understand the basic characteristics required for the application of methanotrophs to bioremediation based on the results. Ammonium salts did not inhibit the specific growth rate of methanotrophs, however, methane consumption was decreased because certain percent of MMO (methane monooxygenases) was used for oxidation of ammonium salts. Ammonium salts did not give negative effects on the proliferation of aggregated methanotrophs community. This was due to different preferences methanotroph Type 1 and II each had in ammonium salts, which rather had positive effect on the comprehensive growth of methanotrophs in cluster level. Nitrite, the final product of ammonium salts oxidation caused by methane monooxygenases, was consistently accumulated, and the generation of methanol and formaldehyde decreased due to decrease of methane monooxygenases which were relatively available. The decreasing rate at this time was 10.7% for COD, 34.8% for methanol, and 24.8% for formate. The decrease in the generation of methanol was found to be the most remarkable. In addition, sMMO(soluble methane monooxygenases) was not manifested at certain level (50 mM as NH₄Cl) of concentration of ammonium salts.

Mg-Al-LDH 첨착 천연제올라이트 (Clinoptilolite)를 이용한 수중의 Acetaminophen 흡착

김이태(Kim, I Tae),정원식(Chung, Wonsik),윤영한(Yoon, Young Han) 대한토목학회 2018 대한토목학회 학술대회 Vol.2018 No.10

Methylobacter와 Methylophilus 미생물 컨소시움에 의한 호기성 탈질 및 PAH(Polycyclic Aromatic Hydrocarbon) 분해

김이태 ( I Tae Kim ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.6

Marine methanotrophs, Methylobacter marinus could be first cultured and grown in no-salt medium. Here, we examined the synergistic effects of a microbial consortium composed of Methylobacter (42%) and Methylophilus (43%) genera (Methylobacter marinus, Methylophilusflavus, and Methylophilusrhizosphaerae) in simultaneous aerobic denitrification and biodegradation of polycyclic aromatic hydrocarbons (PAHs) using the interactions among different species. We confirmed that the Methylobacter and Methylophilus consortium increased the efficiency of aerobic denitrification and biodegradation of PAHs. Methane monooxygenase (MMO) induced the most potent cometabolism in the PAH oxidation chain by methanotrophs via this mechanism, and dehydrogenation by methanol dehydrogenase (MDH), formaldehyde dehydrogenase (FADH), and formate dehydrogenase (FDH) was thought to promote the codegradation of anthracene and phenanthrene. These data confirmed the synergistic effects of coexistence of Methylophilus species, which are dependent on methanol, and Methylobacter species, which produce methanol, in the biodegradation of anthracene and phenanthrene.

활성적니에 의한 Acetaminophen 흡착특성

김이태 ( I Tae Kim ),안광호 ( Kwang Ho Ahn ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.6

In this paper activated neutralized red mud, herein referred to as Toxic-out powder(TOP), is used as a novel adsorbent for removing acetaminophen derived from pharmaceuticals and other personal care products(PPCPs) wastewater. The adsorption of acetaminophen on Toxic-out powder(TOP) is studied as a function of pH, contact time, and adsorbent dosage. The results of adsorption studies indicate that adsorption of acetaminophen by TOP reveals promising results for the removing of acetaminophen in the pharmaceuticals and other personal care products(PPCPs) wastewater, although adsorption of acetaminophen by TOP shows low adsorption capacity at pH values below 7.0 and requires more longer contact time, comparing to activated carbon. It is assumed that adsorption mechanisms of acetaminophen by TOP result in the lattice space of the neoformed minerals such as brucite (Mg(OH)2), aragonite (CaCO3), para-aluminohydrocalcite (CaAl2(CO3)2(OH)4.3H2O), portlandite (Ca(OH)2), hydrocalumite (Ca2Al(OH)7.3H2O) and hydrotalcite (Mg6Al2CO3(OH)16.4H2O) during the TOP manufacturing process. These findings suggest that Toxic-out powder could be used as an efficient low-cost adsorbent for removing acetaminophen in the natural stream, groundwater, and soil as well as pharmaceuticals and other personal care products wastewater.

층상 이중 수화물(Mg-Al-LDH) 첨착 천연제올라이트(Clinoptilolite)를 이용한 가스화 발전설비의 목질계 타르폐수 처리

김이태 ( I Tae Kim ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.5

In this study, we used clinoptilolite, which is a natural zeolite and abundant in Korea, as an absorbent material to treat the tar-containing wastewater, which generated from a biomass gasification plant. The clinoptilolite was synthesized with the Mg/Al double hydroxide (LDH) to maximize the adsorption ability. The chemical species in the tar-containing wastewater was analyzed to find a more effective way of the wastewater treatment. Seventeen chemical species were detected from the analysis, and they were classified into three large groups: (1) phenols, (2) guaiacols, and (3) carbohydrates. There were 7.0 - 16.0% of the adsorption efficiency improvement in all chemical species by using the MG/AL-LHD synthesized clinoptilolite. The phenol components, among the three species, had the highest removal rate, 92%, and it is the 16% improvement of the adsorption efficiency by using the Mg/Al-LDH impregnation on clinoptilolite. In the case of o-cresol as well, 88% was removed, showing the improvement of removal efficiency by 15.8 %. Therefore, if Mg/Al-LHD is impregnated to natural zeolites, there will be the positive effect when treating tar-containing wastewater. In addition, the results of the phenol isothermal adsorption experiment were better explained with the monomolecular adsorption properties of the Langmuir adsorption formula rather than with the Freundlich isothermal adsorption formula.

바이오매스 가스화 발전설비의 목질계 타르폐수 응집 처리 특성

김이태(I Tae Kim),안광호(Kwangho Ahn) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.10

목질계 연료를 사용하는 발전시설에서 세정되어 나오는 목질계 타르 폐수는 간헐적 발생, 발생량 및 발생농도의 변화가 심하여 제거에 어려움이 있다. 본 연구에서는 목질계 타르폐수를 기존의 bag filter와 활성탄을 이용한 처리방법에서 개선하여 물리 화학적 처리를 통하여 처리특성을 살펴보았다. 목질계 타르폐수의 화학적인 발생성상은 페놀류의 함유량이 구아이아콜류(guaiacols)와 카보하이드레이트류(carbohydrates)에 비해 약 2배 이상 높게 나타났다. pH의 변화에 따라 NaOH와 PAC이 자동주입 되도록 설치하고 최종처리수의 pH, 탁도, SS를 살펴본 결과, 각각 5.9, 12.6 NTU, 15.1 mg/L로 발전설비의 순환수로서의 가능성을 확인하였다. 기존의 백필터(bag filter)를 이용한 물리적 처리공정에서의 화학물질의 제거효율은 약 20%였으며, 응집 및 침전을 통한 처리효율을 개선한 결과, 약 80%의 화학물질 제거효율을 나타내었다. There are difficulties in removing wood tar wastewater coming from the power plants that use wood-based fuels due to its intermittent occurrences and severe changes in the amount and concentration. This study investigated the treatment characteristics through physicochemical treatment, an improved method from the existing ones using bag filters and activated carbons to treat wood tar wastewater. In the case of chemical properties of wood tar wastewater, the content of phenols was found to be more than two times higher than that of guaiacols and carbohydrates. Installation is done to ensure that NaOH and PAC are injected automatically according to the change of pH, and then pH, turbidity and SS of the final treated water were examined. The results were 5.9, 12.6 NTU and 15.1 mg/L respectively, which confirmed the possibility of the treated water as circulation water of power plants. In the physical treatment process using a conventional bag filter, removal efficiency of chemicals was about 20%, but the treatment efficiency was improved to show chemical removal efficiency of about 80% through flocculation and sedimentation.

생물막에서의 황입자와 철 농도에 따른 Thiobacillus의 증식특성

김이태 ( I-tae Kim ),안광호 ( Kwang-ho Ahn ),정윤아 ( Yoonah Jeong ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-

본 연구는 폐수 처리를 위해 황 입자와 철을 추가함에 따라 생물막의 특성변화를 관찰하고자 하였다. 생물막의 심층으로 갈수록 Fe, S, Ca, Si, Zn, Al 등의 중금속 함량이 높게 검출되었는데, 특히, 입상황의 경우 표층부에는 5.19%, 중층부에는 9.18%, 심층부에는 18%로 표층에 비해 심층부에는 약 3.5배 정도 높게 검출되었다. 인(P) 성분의 경우에는 심층보다 표층에서 높은 농도로 측정되었는데, 표층에서는 35.5%, 농후 생물막 중심부에는 25.6%, 심층부에는 15.9%가 함유되어 있다. 표층에서 인함량이 높은 것은 농후 생물막 심층부에는 무산소 및 혐기조건이 형성되어 인의 방출이 일어났으며, 호기성 조건인 농후 생물막 표층부에서 인의 흡수가 일어났기 때문으로 판단된다. 철 성분을 주입하지 않은 반응조와 10mg/L 이하의 적은 농도로 주입한 경우에는 Thiobacillus는 관찰되지 않았으며, 슬러지는 약간 검은색을 띄었다. Fe을 50mg/L 주입한 반응조에서는 일부 Thiobacillus 종이 관찰되었으며, Fe 농도가 100mg/L과 500mg/L인 반응조에서는 Thiobacillus종이 반응조 전체에 다량으로 서식하고 있는 것을 알 수 있다. 또한 철 농도가 높을 수록 반응조의 MLSS 농도가 증가하였고 점액질 성분이 많이 생성된 것으로 판단해 보면, 철이 황산화세균인 Thiobacillus 종의 생장에 결정적인 역할을 담당하며, 폐수 속에 함유된 철 성분에 의해 Biofilm의 표면 및 중심부에 Thiobacillus 종이 다량으로 관찰되었다.

쓰레기 관로수송 시스템의 최적 설계 고찰

김이태(I-Tae Kim),정원식(Won-Sik Chung) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

The pneumatic garbage collection is actually the only non-conventional method which is being implanted in many countries all over the world and which offers a new and completely different solution to the garbage collection problem in residential areas. Pneumatic garbage collection means that the garbage is transported pneumatically from the place where it is created in underground pipes to a centralized collection terminal, where it is introduced and compacted in hermetically closed containers, before the final transport to the site of disposal. The propose of this study is describe and analyse all aspect of the pneumatic garbage collection method and to compare these aspects with conventional method, in order to make it possible for urban planer and engineers to aquire a basic design factors about the feasibility of the pneumatic garbage collection.

폐수 및 지하수/관로 : 우리나라 상수수요 특성 분석 및 적용모델 비교 연구

김이태 ( I Tae Kim ),서재승 ( Jae Seung Seo ) 대한상하수도학회 2002 공동추계 학술발표회 논문집 Vol.2002 No.-