• 상하수도학회지
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• 제30권1호
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• pp.99-104
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• 2016

This study was performed to develop a new process technology for advanced wastewater treatment using a modified Rotating Activated Bacillus Contactor (RABC) process that adopts anoxic-oxic suspended biomass tanks to enhance nutrients removal. A modified lab-scale RABC process was applied to examine its applicability and to obtain the design factors for the optimum operation of the system. The modified RABC process showed a little more stable and high nutrients removal efficiency than the prototype RABC process: about 70% of nitrogen and 55% of phosphorous removal when the low organic loading (influent COD 200mg/L). However, the processing efficiency of nutrients removal rates was enhanced to great extent when high organic loading: nitrogen 90% and phosphorous 85% (influent COD 500mg/L). High organic loading stimulated extremely good biomass attachment on the reticular carrier RABC stage and the excellent nutrients removal, nevertheless with almost no offensive odor.

• 아시안잔디학회지
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• 제7권2_3호
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• pp.61-66
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• 1993

This experiment was carried out in order to study effect of organic fertilizer on the growth of Korean lawngrass(Zoysia matrella L. Merr.) and the change of soil chemical characteristics. Results obtained are summarized as follows: l. Organic fertilizer was appropriate for base-dressing in the establishment of turfgrass by means of sod. 2. Chlorophyll contents in mixed application plot of complex organic fertilizer were more abundant than that in single application plot of organic fertilizer. 3. The yield of dry weight in single application plot of organic fertilizer was greater about 40% than that in control plot. 4. As a whole, the growth of Korean lawngrass in mixed application plot of complex and organic fertilizer was more greater than that in single application plot of complex fertilizer. 5. Application of organic fertilizer promote effectiveness of available phosphorous in soil.

• 한국연초학회지
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• 제2권1호
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• pp.37-52
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• 1980

신개간지 토양에 대한 인산시용 수준별 석회, 퇴비증시, 퇴비와 붕소의 혼합시용에 따른 비옥도 증진의 효과가 연초의 수량 및 품질에 미치는 영향을 2년간에 걸쳐 시험한 결과를요약하면 다음과 같다. 1. 개량제 처리의 효과는 1차년도에서 보다 2차년도에 담배 생육과 엽면적지수와 단위엽 면적중을 월등하게 증가시켰다. 3. 개량제의 시용으로 초년도의 pH, 치환성염기등이 숙전과 같은 수준으로 개선되었으며, 처리별 비옥도 증진효과는 퇴비증시구가 컸다. 3. 2차년도 시험결과에서 수량은 대조구에 비하여 15∼25% 증수되었고, 품질은 처리간에 큰 차 없으나, 개량제 시용으로 대조구에 비하여 3 - 7% 향상되었다. 수익 (10a당 수납대금)은 인산흡수계수에 대한 3 %조절량+퇴비증시구가 가장 높아 대조구보다 34%의 증가를 가져왔다.

• Corrosion Science and Technology
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• 제7권1호
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• pp.16-21
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• 2008

A non-phosphorous program employing an alkyl epoxy carboxylate (AEC) has been successfully applied to petrochemical and other large industrial open recirculating cooling water systems. AEC is a patented non-phosphorous calcium carbonate scale inhibitor that has demonstrated better scale inhibition abilities than traditional organic phosphonates. In addition to its antiscalant properties, AEC inhibits carbon steel corrosion when used at high dosages. AEC can be combined with zinc to form a non-phosphorous program with very low levels of phosphate to provide an environmentally acceptable program. In actual applications, the total phosphate developed in the cooling system from cycling the makeup is below 1 ppm as $PO_4$. This level has complied with the highest standards of wastewater discharge limitations. The performance of two AEC/Zinc applications is reviewed. In both cases excellent corrosion and scale control were achieved with AEC/Zinc programs. One case history details the performance with a low hardness water (100 ppm calcium, as $CaCO_3$) operating at 8-10 cycles of concentration. The corrosive nature of the water and the long retention time of the system stressed both the corrosion and scale control capabilities of the program. The second case history demonstrates the performance of the program with a moderate hardness water (400-600 ppm calcium, as $CaCO_3$), but under harsh conditions of high temperature and low flow. The AEC/zinc combination has been found to be highly effective in controlling the corrosion of ferrous metals. AEC can provide good corrosion inhibition at high concentrations, while zinc is known to be an excellent cathodic inhibitor. The combination of the two inhibitors not only provides a synergistic blend that is effective over a wide range of operating conditions, but also is environmentally friendly.

• 환경기술인
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• 통권167호
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• pp.50-53
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• 2000

The Wastewater from livestock farms shows the high organic concentration which was over 3,000mg/L of BOD concentrationin swine wastewater especially. Also the nitrogen concentration and red tide phenomena with phosphorous. Most of the livestock facilities

• 한국유기농업학회지
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• 제19권spc호
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• pp.242-246
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• 2011

Organic kiwifruit orchard soils were compared with conventional ones in Korea. Soil structure of organic soil had higher gaseous and liquous phase as well as soil porosity in the surface soil. Although the nutritional level of each orchards were quite different among soils, the analysis of both system revealed that organic kiwifruit orchard soil had similar or even higher nutrient level (N and organic matter content in surface soil) compared to conventional ones. The organic matter content of deep soil also had the high tendency in deep soil of organic soil. Higher level of nitrogen in organic surface soil is presumably due to the excessive application of organic compost and liquid fertilizer rather than the contribution by grasses such as green manure. Available phosphorous level of organic system was quite high but similar in surface soil of both system, compared to the recommended level. Potassium, calcium and magnesium levels were also enough in organic kiwifruit orchard soils.

• 한국염색가공학회지
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• 제24권1호
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• pp.33-38
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• 2012

In this study, to increase flame retardation of poly(ethylene terephthalate) (PET) in burning, bisphenol A bis(diphenyl phosphate) (BDP), a well known flame retardant containing phosphorous, was reacted on end groups of PET by radical pathway. End-capping mechanism of PET with BDP was suggested and confirmed by spectroscopic and thermal analysis. From 400 MHz $^{31}P$ solid state FT-NMR spectrum of end-capped PET (PET-BDP), phosphorus spectra peak in BDP was found at ca. -20 ppm. Furthermore, P-C bond stretching vibration peaks were found ca. $600cm^{-1}$ in FT-IR spectrums of PET-BDP. These results showed that BDP can be chemically added on end groups of PET by our method. Thermal characteristics of pure PET (pPET) and PET-BDP were measured and evaluated by TGA analysis. There was not significant changes in thermal characteristics of PET-BDP compared to that of pPET.

• 한국염색가공학회지
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• 제24권1호
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• pp.39-44
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• 2012

To improve flame retardation of poly(ethylene terephthalate) (PET) against burning, resorcinol bis(diphenyl phosphate) (RDP), phosphorous containing flame retardant, was incorporated into PET backbone by radical reaction pathway. Radical endcapping of PET with RDP was confirmed by spectroscopic and thermal analysis. From 400 MHz $^{31}P$ solid state FT-NMR spectrum of PET with RDP (PET-RDP), phosphorus spectra peak in RDP was found at ca. -10 ppm. Furthermore, P-C bond stretching vibration peaks were found ca. $530cm^{-1}$ in FT-IR spectrums of PET-RDP. These results indicated that RDP can be chemically bound at the ends of PET by radical addition method. Thermal characteristics of pure PET (pPET) and PET-RDP were measured and evaluated by TGA thermal analysis. There was not significant changes in thermal characteristics of PET-RDP compared to that of pPET.

• 공업화학
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• 제16권6호
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• pp.755-759
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• 2005

본 연구는 유기EL의 기초연구로서, 특히 발광재료인 DPAVBi, AVBi 및 DPVBi를 Witting반응과 Wittig-Horner반응으로 합성했다. 이 반응은 Phosphorous ylide와 4-(디페닐아미노)벤즈알데히드, 9-안트라알데히드 및 벤조페논으로 행해졌다. 반응생성물의 구조적 특성은 FT-IR, 'H-NMR 스펙트로스코피로서 분석되었으며, 열적 안정성, 반응성 및 PL특성은 융점, 수득율 및 발광스펙트럼으로 각각 분석되었다. 순수한 DPAVBi, AVBi 및 DPVBi의 광전발광스펙트럼은 445 nm, 484 nm 및 450 nm 부근에서 각각 관찰되었다. 본 연구에 있어서 합성된 DPAVBi, AVBi 및 DPVBi는 알데히드, 케톤의 카르보닐기의 ${\alpha}$-위치의 안정성에 따라서 다른 반응특성을 나타냈다.

• 한국유기농업학회지
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• 제19권2호
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• pp.229-243
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• 2011

최근에 소비자들의 안전 농산물에 대한 관심과 정부의 정책적인 친환경농업에 대한 지원은 유기농 재배를 지속적으로 발전시켜 왔다. 본 연구는 유기농 재배 과원과 관행 과원간의 토양 물리성과 화학성 및 미생물성에 대한 시기별 비교분석을 통하여 변화양상을 구명하고자 수행되었다. 토양 가비중과 고상 및 경도는 유기농 과원에서 통계적으로 유의성있게 낮게 나타났다. 토양 pH와 유기물 함량은 3월에서 8월까지 증가하는 경향이 나타났고, 유기농 과원에서 관행과원에 비하여 높은 경향을 나타내었다. 전질소와 유효인산은 처리구에 상관없이 3월에서 8월까지 각각 감소하는 경향을 보였으며, 유기농 과원에서 관행과원보다 전질소는 높았으나 유효인산은 낮은 경향을 나타내었다. 토양 미생물 탄소 생체량은 처리구에 상관없이 3월부터 8월까지 증가(유기농 36%, 관행 15%)하였고, 미생물 질소생체량은 6월에 가장 높았고, 유기농 과원에서 관행과원보다 지속적으로 높은 미생물 생체량을 나타내었다. 토양중 dehydrogenase와 chitinase activity는 3월과 8월보다 6월에 가장 높았고, ${\beta}$-glucosidase activity는 시기적으로 점차 감소(유기농 38%, 관행 48%)하였으며, acid phosphatase activity는 증가하였다. 유기농 배 과원토양에서 관행재배에 비하여 6월에 조사된 acid phosphatase activity를 제외하고는 모든 효소활성이 시기에 상관없이 높은 분포를 나타내었다.