• 한국약용작물학회지
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• 제24권3호
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• pp.183-190
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• 2016

Background: This study determined the effects of mulching, an environment friendly organic cultivation method, on antioxidant compound contents and growth in Codonopsis lanceolata, commonly known as Deodeok. Methods and Results: C. lanceolata was treated by mulching with several different methods (a non-woven fabric, biodegradable film, or rice husks) and also treated with hand weeding. A non-treatment plot was used as a control. The growth and levels of weed control in C. lanceolata were better in plants cultivated under mulching treatments (non-woven fabric, biodegradable film, and rice husks) than in those under non-mulching treatments (hand weeding and non-treatment). The contents of antioxidant compounds, such as total flavonoids, phenolics, and anthocyanins, were highest under the biodegradable film treatment, followed by the non-woven fabric treatment, rice husks treatment hand weeding, and non-treatment. There were identifiable differences in DPPH and ABTS activity in comparison to antioxidant compound content by solvent fractions. Mulching treatments resulted in higher DPPH scavenging activity in water and ethyl ether fractions and ABTS scavenging activity in n-butanol fractions than in other fractions, as opposed to hand weeding and non-treatment groups, although total activity of DPPH and ABTS did not increase with mulching treatments. Conclusions: Mulching C. lanceolata with biodegradable film and non-woven fabric is an effective method for improving plant growth and inhibiting the occurrence of weeds as well as for increasing antioxidant compound content and altering antioxidant activity.

• 한국물환경학회지
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• 제21권5호
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• pp.484-489
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• 2005

In order to determine the removal rate of non-biodegradable substances and the change of their structural properties, this study was carried out by an ozone-treatment experiment on leachate collected from the landfill area of D City in Chung chung nam-do and examined the change of the chemical properties of non-biodegradable substances. The main elements of non-biodegradable substances in landfill leachate were benzene, toluene, trichloroethane, trichloroethylene, xylene, etc. and the concentration of toluene was 15.7 mg/L on the average, benzene 7.2 mg/L, trichloroethane 1.1 mg/L, trichloroethylene 0.75 mg/L and xylene 0.5 mg/L. When leachate was treated with ozone for 10 min, 30 min and 60 min, UV absorbance was reduced with the increase of reaction time, and the reduction rate was 38.6% at 60 min. TOC was removed by 13.2% at 60 min. The low reduction rate of TOC may be because TOC reacts indirectly with OH radical produced from reaction with ozone while UV absorbance usually relies on direct reaction between organic matters and ozone molecules. Color was removed by up to 97%, which suggests that ozonation is highly effective in removing coloring elements in leachate. Sixteen kinds of non-biodegradable compounds were found in the leachate and most of them had the characteristic of aromatic hydrocarbon. Among them dibutyl phthalate was identical with a substance included in the list of US EPA, which is classified as a mutagen that may cause the mutation of genes and disorders in chromosomes. In addition, 2,5-Cyclohexadiene-1,4-dione, 1,2-Benzenedicarboxylic acid and butyl octyl ester were found to be similar to substances listed by USEPA. According to the result of analyzing structural changes before and after ozonation using GC-MS, cyclic compounds and aromatic compounds were observed in the original water and aliphatic compounds were newly observed after ozonation. In addition, through ozonation, humic substances of high molecular weight were oxidized and decomposed and produced low-molecular compounds such as aldehyde, ketone and carboxyl acid and highly biodegradable aliphatic carbon, which suggests the bio-degradability of non-biodegradable substances.

• 펄프종이기술
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• 제43권2호
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• pp.49-56
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• 2011

Mulching technique is used to control the temperature and moisture content of soil by covering the ground surface. Most kinds of mulching film are made of polyethylene which is non-biodegradable synthetic polymer. Utilizing these films has been one of the main sources in soil pollution. Thus residual films under the ground should be removed after a certain period of time. Therefore, an alternative mulching material made of biodegradable functional paper is considered instead of non-biodegradable films. The mulching sheet produced from paper basis has a functionality to be naturally degraded and then recycled to the bio-materials on soil. In this study, the paper based-mulching sheet coated with biodegradable polymer was specially produced using a laboratory bar coater. Coating colors prepared by dissolving PBS/PLA in chloroform were applied to kraft paper. The mechanical strength and aging properties of this mulching sheet were investigated. The burst strength of polymer-coated paper was decreased with the increase of the PBS ratio in PBS/PLA blends, and, in particular, 30/70 blending condition led to good stability in heat-aging atmosphere for 60 days.

• 상하수도학회지
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• 제25권6호
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• pp.861-867
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• 2011

Wastewater from crude oil reserve base usually contains large amount of non-biodegradable contaminants. The conventional wastewater treatment progress can hardly meet the regulation of wastewater effluent quality. This study investigated the removal of non-biodegradable organic contaminants in wastewater from crude oil reserve base using a pulse UV treatment. The modified process incorporating pulse UV process was set up to treat the wastewater from crude oil reserve base. The treatment process is composed with coagulation and flocculation, micro-bubble flotation, sand filter, pulse UV system, and GAC filter. The results show CODMn was effectively removed by the process with pulse UV system and it can meet the wastewater effluent regulation. The single effect of pulse UV process in CODMn removal was not significant(9~15% based on sand filtered effluent), however with the subsequent activated carbon filter the removal ratio CODMn was increased up to 28% compared to the process without pulse UV syetem.

• 한국산학기술학회논문지
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• 제19권5호
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• pp.64-71
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• 2018

본 논문은 호기성 생분해도를 통하여 유가공 폐수의 기질특성을 파악하기 위하여 수행되었다. 유기물 중 빨리 분해되는 물질(Ss)은 SCODcr 기준을 84.2 %로 조사되었는데, 이는 수산물 가공폐수의 75.8~77.9 %, 돈사폐수의 58.2 % 보다 높은 것으로 조사되었다. 생물학적 분해 불가능한 용존성 유기물(SI)의 비율은 5.6~6.4 %로, 미생물 신진대사에 의해 발생 되는 inert 물질 비율(SIi)은 3.6~3.7 %로 조사되었다. 생물학적 분해 불가능한 용존성 유기물 성분의 함유 계수(YI) 0.092~0.099로, 미생물 신진대사로 생성되는 inert 물질의 생성계수(Yp)는 0.039~0.040으로 산정되었다. 유기물 성분 계수 분석결과, 유가공 폐수의 용존성 유기물 약 91.0 %가 생물학적으로 분해 가능한 물질이고, 이중 약 92.5 %가 빨리 분해되는 Ss 성분으로 조사되었다. 또한 총유기물(TCODcr) 중에 생물학적 분해 가능한 유기물의 비율은 89.3 %로 조사되었다. 생물학적 분해 불가능한 용존성 유기물(SI) 성분은 3.0 %, 생물학적 분해 불가능한 부유성 물질(XI) 성분은 7.7 %로 비교 대상 폐수보다 낮게 조사되었는데, 이는 유가공 폐수가 호기성 생분해도가 크다는 것을 의미한다.

• 대한환경공학회지
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• 제31권10호
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• pp.909-918
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• 2009

급수시스템에서 박테리아 재성장의 영양원이 되는 DOC를 정수처리 공정에서 효과적으로 저감시키기 위하여 생분해와 흡착으로 구분하여 네 종류의 DOC로 분획하였고 각각의 제거특성을 연구하였다. 네 종류의 분획 DOC는 흡착성을 가지면서 생분해성이 없는 AnBDOC, 흡착성이 없고 생분해성만이 있는 nABDOC, 흡착과 생분해성을 동시에 나타내는 ABDOC, 흡착과 생분해가 되지 않는 nAnBDOC로 구분하여 분석하였다. 낙동강 중류에 위치한 정수처리장 원수의 조사결과, ADOC가 BDOC보다 약간 높은 비율로 존재하고 있으며, 오존산화 후에는 분획 DOC 중에서 AnBDOC 농도가 가장 많이 제거되었으며, 제거율은 nAnBDOC가 49.5%로 가장 높았다. BAC 공정으로 제거된 분획 DOC 중에는 ADOC가 약 91%를 차지하고 있으므로 흡착에 의한 제거가 우수한 것으로 나타났고, 잔류하는 TDOC 0.50 mg/L 중에는 ADOC가 0.46 mg/L(67.7%)을 차지하고 있으므로 배수관내 미생물 증식 및 소독부생성물의 생성 방지를 위하여 BAC 공정상에서 EBCT증가, 재생주기 등의 운전조건을 개선해야 하는 것으로 나타났다. 정수처리 공정에서 DOC분획 결과로부터 흡착이나 생분해 등으로 제거 가능량을 파악할 수 있으므로 정수처리 공정에 유용한 것으로 나타났다. 염소처리하는 정수처리 공정에서 DOC분획 농도와 밀접한 관계를 가지는 AOX의 분석결과, AOX 7.1 ${\mu}g$/L은 오존산화와 활성탄흡착 공정으로 0.51 ${\mu}g$/L까지 충분히 제거되었다.

• 수산해양기술연구
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• 제47권2호
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• pp.153-163
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• 2011

The main purpose of this study is to understand the marketing approaches and strategies that are used to disseminating biodegradable fishing gears and distinguish the cognition and the non-cognition group's attitudes on the product. We used a technology acceptance model for analyzing product attributes and its impacts on fishers' purchase. The result of this research shows that 'perceived usefulness and easiness of use' have positive effect on 'purchase intention,' and then give impacts on 'purchase intention' for the entire respondents. For the cognitive respondents these factors have influence on 'attitude' but they do not affect 'purchase decision.' However, 'perceived usefulness and easiness of use' have much positive impact on 'purchase intention.' In the non-cognition group, the 'perceived intention' and 'company and country of manufacturers' have direct positive effect on 'purchase intention' through 'attitude' and also 'on 'purchase intention.' This research provides some meaningful policy implications on further development and technology marketing of biodegradable fishing gears.

• 유기물자원화
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• 제32권1호
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• pp.49-59
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• 2024

생분해성 중합체 코팅 요소는 질소 용출을 제어하면서, 질소이용 효율을 극대화하며 농업생태계의 비점오염원을 줄여주는 역할을 한다. 따라서 본 연구의 목적은 생분해성 중합체 혼합물을 이용한 코팅 요소의 용출 패턴과 온실가스 배출량을 구명하는 것이었다. 처리내용은 속효성 비료인 요소를 대조구, 난분해성 코팅 요소(NBCF), 생분해 완효성 코팅 요소(NB60)와 생분해성 완효성 코팅 요소(MDS)를 토양에 혼합한 4가지 수준으로 구성하였다. 침출수에 대한 최대 총 질소 누적 농도는 NBCF가 NB60보다 33% 높았으며, NB60이 NBCF 보다 최대 용출 기간은 10일 지연되는 것으로 나타났다. 누적 총 질소 및 NO₃-N의 용출 패턴에서 NB60과 NBCF는 일차 직선형태로 동일하였지만, 대조구와 MDS는 Sigmoid curves 형태로 누적 용출 농도는 MDS가 대조구보다 높게 나타났다. 생분해성 코팅 요소의 온실가스 발생량을 살펴보면, CH₄의 발생량은 대조구 대비 NBCF, NB60, MDS 각각 0.38%, 11.36%, 5.91% 증가하였고, 또한 N₂O의 발생량은 대조구 대비 각각 50.5%, 32.4%, 58.8% 증가하는 것으로 나타났다. 따라서 생분해 완효성 코팅 요소는 비료 이용성을 감안하여 포장에 시용할 경우 비료 시용량뿐만 아니라 농업생태계 비점 오염원을 줄일 수 있을 것으로 판단된다.

• 한국물환경학회지
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• 제22권1호
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• pp.66-73
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• 2006

The purpose of this study was done to evaluate degradation characteristics of non-biodegradable organic matters including aromatic compounds in livestock wastewater using CFZ process. The CFZ process is consisted of coagulation/sedimentation, Fenton oxidation and zeolite adsoption process. degradation charateristics of each treatment water including livestock wastewater were analyzed by UV scanning, FT-IR and GC/MS. After coagulation/sedimentation process as 1st treatment, non-biodegradable matters remained after 1st treatment were removed by using OH radical produced in Fenton oxidation process. As a result of treatment using these processes, NBDCOD removal efficiency was over 90%. Increase of $E_2/E_3$ ratio (absorbance at 250 and 365 nm) in each treatment water means that aromaticity of livestock wastewater decreased. In case of GC/MS, most aromatics or polynuclear aromatics like benzene, phenol and scatol in livestock wastewater almost wasn't detected after oxidation using OH radical.

• KSBB Journal
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• 제19권5호
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• pp.390-393
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• 2004

Oxygen uptake rate (OUR) was used as an indicator of microbial activity. In this study OUR at dyeing wastewater in the pilot plant was monitored to examine biological activity. Correlation between inlet COD concentration and maximum OUR showed that maximum OUR was proportional to inlet COD concentration. Changes in the OUR values reflected the changing waste load in the reactor. Consequently, OUR can be used to estimate biological activity of inlet COD concentration. This study showed that biodegradable COD at dyeing wastewater could be calculated from OUR and yield coefficient. Non-biodegradable COD was able to be calculated from a difference between initial COD concentration and biodegradable COD.