• 한국정보통신학회논문지
• /
• 제18권9호
• /
• pp.2313-2321
• /
• 2014

정수장, 하수처리장, 폐수처리장의 배출수 처리공정에서 고 농도의 슬러지 선별, 이송 및 약품 투입량 조절을 위한 기준으로 슬러지 농도계가 사용되고 있다. 본 논문은 슬러지 농도계의 정도 향상과 문제점 개선을 통해 배출수 처리공정의 운영 효율화와 자동화 기반을 마련하고자 한다. 센서를 다중빔으로 설계 및 최소편차 선형평균 필터링을 적용하여 농도계의 정도 향상과 안정성을 실현하였으며, 부단수 방식의 센서 착탈 설계로 배출수 시설 운영중에도 유지관리가 가능토록 하였다. 이렇게 구현된 다중빔 방식 슬러지 농도계의 성능을 Pilot Plant를 통하여 다양하게 검증하였다.

• 동력기계공학회지
• /
• 제10권4호
• /
• pp.105-110
• /
• 2006

Among many other alternative energy resources, small scale hydro power has been brought into attention as a reliable source of energy today, which had been relatively neglected since 1960s. Especially, Kaplan micro-turbine can be applied to various kind of small hydro power plants, such as reservoirs for agriculture purpose, sewage treatment plants and water purification plants. However present low head of Kaplan micro-turbines and small scale hydro turbines, have limitations in the minimum required head and flow rate for efficient operation. This research is to develop modeling analysis for the Kaplan micro-turbine, which can improve economical features of small hydro power plants. The contents and scope of this research are the efficiency improvement of Kaplan micro-turbine.

• 대한토목학회논문집
• /
• 제37권5호
• /
• pp.863-869
• /
• 2017

본 연구에서는 다양한 정수처리공법과 시설을 분류하여 정수장의 시설물 정보분할코드체계를 구축하였으며, 이것은 정수장 시설의 생애주기 동안 소요되는 유지관리비용, 에너지 사용비용 산정 및 배출된 환경오염원의 규명과 환경영향평가의 정량적 분석 등을 위한 정보를 통합하기 위한 전산시스템의 코드체계로 활용하게 된다. 건설공사의 정보는 많은 이질정보를 포함하고 있기 때문에 이를 통합해서 관리하기 위한 코드체계가 매우 중요하다. 또한 정수장 시설은 많은 프로세스를 포함한 시설물 설치공사가 주를 이루기 때문에 좀 더 세분화된 분활코드가 필요하다. 따라서 본 연구에서는 국내에서 시도되지 않은 정수장 관련 분류체계를 건설공사 분류체계인 파셋 분류체계 표현방식을 활용하여 구축하였다.

• Journal of Microbiology and Biotechnology
• /
• 제22권5호
• /
• pp.674-683
• /
• 2012

A new strain, SD12, was isolated from tannery waste polluted soil and identified as Pseudomonas aeruginosa on the basis of phenotypic traits and by comparison of 16S rRNA sequences. This bacterium exhibited broad-spectrum antagonistic activity against phytopathogenic fungi. The strain produced phosphatases, cellulases, proteases, pectinases, and HCN and also retained its ability to produce hydroxamate-type siderophore. A bioactive metabolite was isolated from P. aeruginosa SD12 and was characterized as 1-hydroxyphenazine ((1-OH-PHZ) by nuclear magnetic resonance (NMR) spectral analysis. The strain was used as a biocontrol agent against root rot and wilt disease of pyrethrum caused by Rhizoctonia solani. The stain is also reported to increase the growth and biomass of Plantago ovata. The purified compound, 1-hydroxyphenazine, also showed broad-spectrum antagonistic activity towards a range of phytopathogenic fungi, which is the first report of its kind.

• 한국환경복원기술학회지
• /
• 제8권5호
• /
• pp.1-9
• /
• 2005

This study was conducted to investigate the effect of aquatic plant as a botanical air purification on the indoor air pollution by formaldehyde. Three aquatic plants such as Eichhornia crassipes, Cyperus alternifolius, Echinodorus cordifolius, were selected for this study and they were placed in the artificially contaminated chamber under laboratory condition. The results showed that all three plants could remove the formaldehyde from the contaminated air system effectively. Reduction in the formaldehyde levels by Eichhornia crassipes, which is the floating plant, might be associated with the factors of plant and water. Reduction in the formaldehyde levels by Cyperus helferi and Echinodorus cordifolius, which were emergent plant, was due to the complex effect of plant, soil medium and water. In aquatic plant system, dissolution, microbial degradation in rhizosphere, uptake through root and shoot, sorption to soil and shoot, hydrolysis are known as the main mechanisms of water soluble pollutants in the given system. The advantages of indoor air quality control system using aquatic plants can be; 1) various purifying mechanisms than foliage plants, 2) effective for decontamination of water soluble pollutants; 3) easy for maintenance; 4) diverse application potential. Therefore it was suggested from the results that indoor air control system of aquatic plants should be more effective for reduction of indoor air pollutants.

• 인간식물환경학회지
• /
• 제23권1호
• /
• pp.15-21
• /
• 2020

In this study, we compared efficiency of different aquatic plants in removing indoor pollutants and examined their potential to purify indoor air. Two liter of water in chamber was used as the control, while the other chambers containing water lettuce (Pistia stratiotes), water hyacinth (Eichhornia crassipes), and water coin (Hydrocotyle umbellata) were used as treatment groups. Temperatures inside all the chambers were maintained between 20 ℃ and 23 ℃. Humidity in the chambers with aquatic plants increased by 30% and 50% control respectively. The removal of formaldehyde per unit leaf area was examined in each aquatic plant. It turned out that water hyacinth removed the highest amount of formaldehyde, followed by water lettuce and water coin. Both water hyacinth and water lettuce increased the amount of removal of formaldehyde until the end of the experiment. In the case of airborne dust (PM 10) and fine dust (PM 2.5), water coin, which had the highest number of leaves, removed more PM 10 and PM 2.5 than the other aquatic plants, with statistically significant difference. In addition, both water coin and water hyacinth smoothly opened and closed stomata before and after the experiment. Consequently, as the aquatic plants were effective in controlling humidity and removing pollutants, they can be used as air purifying plants.

• 생태와환경
• /
• 제53권3호
• /
• pp.286-294
• /
• 2020

깔따구(Diptera: Chironomidae)는 저서성 대형무척추동물로 환경오염 및 수질 모니터링에 이용되는 중요한 지표생물이다. 본 연구에서는 인천 수돗물 정수장에서 발견된 깔따구류의 정밀한 종 동정을 위해 형태적 분류와 미토콘드리아 DNA에서 cytochrome c oxidase subunit I (COI) 유전자의 염기서열을 이용하여 분석하였다. 정수장 6곳의 20개체는 안개무늬날개깔따구(Chironomus kiiensis) 12개체, 노랑털깔따구(Chironomus flaviplumus) 6개체, 등깔따구(Chironomus dorsalis) 1개체, 용산무늬깔따구(Polypedilum yongsanensis) 1개체 등 4종으로 확인되었다. 각 깔따구 종의 형태적 특징은 두부, 하순기절, 대악, 안테나, 발톱의 형태적 특징을 살펴보았다. NCBI Genbank에 등록된 깔따구 17종 21개체의 COI 염기서열을 바탕으로 본 연구에서 조사된 20개체의 계통진화적 분석한 결과 각 4종의 깔따구 COI 염기서열은 등록된 동인 종과 높은 상동성을 보이며 (99~100%) 같은 계통군(clade)으로 나타났다. 이러한 결과는 국내 깔따구의 종 동정을 위한 형태적- 유전적 정보를 통합적으로 제공함으로 담수생태계의 모니터링을 위한 주요한 정보로 활용될 것이다.

• 반도체디스플레이기술학회지
• /
• 제20권4호
• /
• pp.89-95
• /
• 2021

As the influence of fine dust on society spreads gradually, the public's interest in indoor air is increasingly rising. Air-purifying plants are drawing keen attention due to their natural purifying function enabled by plant physiology. However, as their fine dust reduction mechanism is limited to adsorption only, vegetation bio-filters that optimize purification effects through integration with air-conditioning systems is rising as an alternative. In accordance with the relevant standard test methods, this study looked into the fine dust reduction assessment method by air-conditioning airflow volume that can be used for the industrial spread of vegetation bio-filters. In the case of PM₁₀ at 300 ㎍/m³, it was in the order of EG-B(3,500CMH, 29 min.) < EG-A (2,500CMH, 37 min.) < CG(0CMH, 64 min.) for reaching the maintenance level (100 ㎍/m³) of publicly used facilities. For reaching the WHO Guideline(50 ㎍/m³) requirement, it was in the order of EG-B (51 min.) < EG-A (160 min.) < CG (170 min.). In the case of PM_2.5, it was in the order of EG-B (26 min.) < EG-A (33 min.) < CG (57 min.) for reaching the maintenance level (50 ㎍/m³) of publicly used facilities. It was in the order of EG-B (48 min) < EG-A (140 min) < CG (158 min) for reaching the WHO Guideline (25 ㎍/m³) requirement. The findings from the analysis showed that fine dust can be reduced most efficiently when the system is operated at 3,500CMH level. The limitation of this study is that due to the absence of a way of assessing the stress of plants in vegetation bio-filters, generating optimal air-conditioning air flow of the relevant system and economics analysis against the existing facility-type air purification system have been clarified, which should be explored further though follow-up studies.

• KIEAE Journal
• /
• 제8권2호
• /
• pp.53-58
• /
• 2008

With architectural technology, a building has been a far dense and close. So the thermal environment of the building has become pleasant, but the quality of indoor air has been degraded. Using synthetic products for construction materials and furniture indoors escalates the concentration of volatile organic compounds(VOCs) at indoor air, threatening the health of the residents. To reduce the concentration of volatile organic compounds at indoor air, many methods are designed, and of late, concern has been increased about the effect of air purification using air purifying plants. Field measurements were performed using Aglaonema brevispathum, Pachira aquatica and Ficus benjamiana, which were verified as air-purifying plants by NASA. The effect of reducing the concentration of air contaminants by plant studied in a full scale mock-up model. The variations of concentration of Benzene, Toluene, Ethylbenzene and Formaldehyde were monitored. In most cases, the effect was excellent in Toluene and formaldehyde in summer.

• 화훼연구
• /
• 제17권1호
• /
• pp.52-61
• /
• 2009

우리나라 내륙습지 7곳의 식물상과 군락을 조사한 결과, 우리나라 내륙습지 7곳의 식물상은 32과 49속 69종이었으며 이 중 사초과가 16종으로 23%로 나타났으며 일년생 초본식물 군락 1개와 다년생 초본식물 군락 6개 등 총 7개 군락(큰고랭이군락, 갈대군락, 줄군락, 고마리군락, 부들군락, 비녀골풀군락, 골풀군락)을 보였다. 조사습지 전체의 중요도 값이 높게 나온 우점식물은 큰고랭이, 갈대, 줄, 고마리, 부들, 비녀골풀 및 가래였다.