본 연구는 전기투석과 용매추출을 융합한 희유금속 회수 공정에서 분리막과 음이온교환막의 개질을 통해 유기상 과 수상에 대한 분리막의 낮은 젖음성 및 AEM을 통한 수소이온 투과로 인한 금속이온의 회수 효율 감소를 개선하였다. 구체 적으로, 분리막 표면 중 한면은 polydopamine (PDA) 통한 친수성 개질, 다른 면은 SiO2 또는 graphene oxide를 통한 친유성 개질을 함으로써 분리막의 젖음성을 개선하였다. 또한, 음이온교환막의 표면을 polyethyleneimine, PDA, poly(vinylidene fluoride) 등을 이용, 개질해 수분 흡수(Water uptake) 감소 및 기공구조 변화를 통해 수소이온 수송을 억제해 수소이온 투과를 억 제할 수 있다. 개질된 막 표면 형상과 화학적 특성 및 조성은 주사전자현미경과 푸리에변환 적외선 분광법을 통해 확인되었 고, 이를 구리 이온 회수 시스템에 적용해 향상된 추출 및 탈거 효율과 수소이온 수송 억제능을 확인하였다.

본 연구는 생체난포란 채란을 위한 공란우를 대상으로 난포란의 채란 효율과 번식 관련 혈액내 호르몬 성상을 조사하여 수정란 채란과 생체난포란 채란시 공란우의 선발 관련 자료로 활용하고자 본 연구를 수행하였다. 공란우의 사양관리는 배합사료 3.0Kg 과 건초 6kg 을 (배합사료 TDN 68%, CP 14% 조사료는 건초 TDN 50%, CP 6.58%) 급여하였다. 생체난포란 채란을 위한 한우 공란우는 한우연구소에서 사육중인 한우에서 실시하였다. 생체 내 난포란의 관찰은 MyLabTM30VETGOLD(Esaote, Genova, ITALY) 및 탐촉자(EC123; Micro-Convex 9∼3 MHz, Esaote, Genova, ITALY)는 6.6 MHz convex scanner 를 사용하였고, 난포란 채란에 사용된 주사침은 19G 주사침을 사용하였다. 초음파상에서 2mm 이상의 난포 수량을 확인하고 난포란을 흡인하였다. 공란우로부터 채란된 난포란 수와 혈액내 주요 영양대사물질 6 항목 Glucose(mg/dl), Cholesterol(mg/ml) BUN(mg/dl) AST(U/L) ALT(U/l), Nonesterified Fatty Acids(NEFA, uEq/L)의 수준을 분석하였다. 각 개체별 Glucose 농도는 67.5±4.9, 78±2.82, 75±21.2, 65±4.24, 56.5±2.12, 78.5±10.6, Cholesterol 78±19.7, 84.5±2.12, 181±42.4, 156±25.4, 103±9.8, 112.5±10.6, BUN 8.75±1.76, 8.6±1.34, 14.6±2.75, 10.2±0.56, 10±0.56, 12.2±0.42, AST 76.5±12.02, 69.5±2.12, 90.5±19.1, 83.5±6.36, 62.5±7.78, 86.5±0.7, ALT 14.5±2.12, 14±2.83, 28±1.41, 23±5.66, 15.5±2.12, 22.5±3.53, NEFA 67.5±54.5, 109±38.18, 177.5±103, 149.5±64.34, 104.5±28.99, 22.7±92.0 로 나타났다. 개체에 따른 항목별 분석에서 난포란 회수 효율이 가장 높은 개체의 Glucose 농도는 67.5, BUN 수준은 8.75 수준이며 NEFA 농도는 67.5 수준으로 나타났음을 확인하였다. 영양수준에 따른 채란 효율과의 연관성 분석을 위해서는 지속적인 연구가 진행되어야 할것이며 영양수준 뿐만 아니라 환경적인 자료 분석도 필요할 것으로 사료 된다.

Recently, interest in the development of alternative water resources has been increasing rapidly due to environmental pollution and depletion of water resources. In particular, seawater desalination has been attracting the most attention as alternative water resources. As seawater desalination consumes a large amount of energy due to high operating pressure, many researches have been conducted to improve energy efficiency such as energy recovery device (ERD). Consequently, this study aims to compare the energy efficiency of RO process according to ERD of isobaric type which is applied in scientific control pilot plant process of each 100 m3/day scale based on actual RO product water. As a result, it was confirmed that efficiency, mixing rate, and permeate conductivity were different depending on the size of the apparatus even though the same principle of the ERD was applied. It is believed that this is caused by the difference in cross-sectional area of the contacted portion for pressure transfer inside the ERD. Therefore, further study is needed to confirm the optimum conditions what is applicable to the actual process considering the correlation with other factors as well as the factors obtained from the previous experiments.

한우의 암소 개량을 목적으로 다양한 번식우의 활용 기술이 개발되어 오고 있다. 특히 수정란 을 이용한 개량 연구 중 생체난포란 (ovum pick-up, OPU) 방법은 체내수정란 생산을 위한 과배 란처리 방법 보다 공란우의 활용성을 높이기 위해서 사용되고 있는 기법이다. 따라서 본 연구에 서는 한우의 생체에서 난포란의 채란의 효율성에 관한 연구를 수행하였다. 생체난포란 채란을 위한 한우 공란우는 한우연구소에서 사육중인 한우에서 실시하였다. 생체 내 난포란의 관찰은 MyLabTM30VETGOLD (Esaote, Genova, ITALY) 및 탐촉자 (EC123; Micro-Convex 9∼3 MHz, Esaote, Genova, ITALY)는 6.6 MHz convex scanner를 사용하였고, 난포란 채란에 사용된 주사침은 19G 주사침을 사용하였다. 초음파상에서 2mm 이상의 난포 수량을 확인하고 난포란을 흡인하였다. 흡입된 난포란은 2∼3회 washing으로 혈액 등의 이물질을 제거하여 실체현미경 하에서 회수하였 고, 난포란의 등급분류는 세포질 균일도와 난구세포의 부착 정도에 따라 평가기준을 1등급에서 3 등급까지 분류하였다. 체외발달을 유도하기 위해서 회수된 난포란의 체외성숙배양은 TCM 199 기 본배양액에 소 태아혈청 (Fetal Bovine Serum) 0.5%와 LH, FSH, FGF, EGF 첨가하여 22시간 동안 배양하였고, 체외수정은 IVF 100 (IFP, Japan) 배양액 50μl 미소적에 성숙 난포란 20개씩 넣어서 체 외수정을 실시하였다. 체외수정을 위해서 KPN 동결정액을 사용하였고 수정을 위한 정자의 최종 농도는 2x106/ml로 6시간 동안 체외수정을 유도하였다. 체외발달유도는 SOF 배양액으로 5% O2, 5% CO2, 그리고 90% N2 와 38.5°C 인큐베이터에서 8일째 까지 배양하였다. 4두의 공란우로부터 개체당 8session 을 실시하였다. 개체별 회수효율은 평균 6.6±1.30, 7.5±2.20, 6.13±1.13, 4.9±1.36개의 결과를 보였다. 평균 1등급 43개, 2등급 9.5개, 3등급4.8개로 나타났다. 회수된 난자의 체외발달율 에서 분할율은 68.8%, 배반포 발생율은 28.4%의 결과를 보였다. 따라서 본 연구 결과로 미루어 볼 때 사료급여 방법에 따른 연구도 병행하여 추진해야 할 것으로 사료된다.

Recently, Korea’s municipal wastewater treatment plants generated amount of wastewater sludge per day. However, ocean dumping of sewage sludge has been prohibited since 2012 by the London dumping convention and protocol and thus removal or treatment of wastewater sludge from field sites is an important issue on the ground site. The hydrothermal carbonization is one of attractive thermo-chemical method to upgrade sewage sludge to produce solid fuel with benefit method from the use of no chemical catalytic. Hydrothermal carbonization improved that the upgrading fuel properties and increased materials and energy recovery ,which is conducted at temperatures ranging from 200 to 350°C with a reaction time of 30 min. Hydrothermal carbonization increased the heating value though the increase of the carbon and fixed carbon content of solid fuel due to dehydration and decarboxylation reaction. Therefore, after the hydrothermal carbonization, the H/C and O/C ratios decreased because of the chemical conversion. Energy retention efficiency suggest that the optimum temperature of hydrothermal carbonization to produce more energy-rich solid fuel is approximately 200°C.

본 연구에서는 4종류의 관형 세라믹 정밀 및 한외여과막(탄소 재질)으로 제지공장의 방류수를 물로 주기적 역세척하면서 여과하였을 때, 최적 역세척 시간을 규명하였다. 각 분리막에 대상으로 물 역세척 시간의 영향을 살펴 본 결과, 분리막의 기공이 클수록 길게 역세척 하는 것이 가장 많은 총여과부피, 즉 처리수의 회수 효율이 높기 때문에 가장 효과적이라 할 수 있다. 한편, 180분 동안 여과하면서 초기투과선속에 대한 투과선속의 변화를 살펴본 결과, 정상운전시간이 길수록 막오염이 많이 진행된 상태이므로 역세척 시간을 길게 해주여야만 막오염을 억제하여 높은 투과선속을 유지할 수 있다는 것을 알 수 있었다. 또한, 막오염의 저항 변화 추이를 관찰하여 최적 물역세척 시간을 규명해 보아도, 투과선속의 변화로부터 얻은 최적 역세척 시간과 거의 동일한 결과를 얻을 수 있었다.

This study measured the energy recovery rate of each municipal waste incineration facility according to the revised energy recovery rate estimation method, which targeted four municipal waste incineration facilities (Unit No. 7). The results calculated by the measuring instruments were used for each factor to estimate the recovery rate, and the available potential of available energy was examined by analyzing the energy production and valid consumption. As a result of the low heating value, 2,540 kcal/kg was calculated on average when the LHVw formula was applied, which is approximately 116 kcal/kg higher than the average design standard of 2,424 kcal/kg. The energy recovery rate was calculated as 96.9% on average based on production and 67.5% based on effective consumption, and the analysis shows that approximately 29.4% energy can be used.

This study was carried out to examine the improvement plan by analyzing the characteristics of imported wastes, operation rate, and benefits of energy recovery for incineration facilities with a treatment capacity greater than 50 ton/ day. The incineration facility capacity increased by 3,280 tons over 15 years, and the actual incineration rate increased to 2,783 ton/day. The operation rate dropped to 76% in 2010 and then rose again to 81% in 2016. The actual calorific value compared to the design calorific value increased by 33.8% from 94.6% in 2002 to 128.4% in 2016. The recovery efficiency decreased by 29% over 16 years from 110.7% to 81.7% in 2002. Recovery and sales of thermal energy from the incinerator (capacity 200 ton/day) dominated the operation cost, and operating income was generated by energy sales (such as power generation and steam). The treatment capacity increased by 11% to 18% after the recalculation of the incineration capacity and has remained consistently above 90% in most facilities to date. In order to solve the problem of high calorific value waste, wastewater, leachate, and clean water should be mixed and incinerated, and heat recovery should be performed through a water-cooled grate and water cooling wall installation. Twenty-five of the 38 incineration facilities (about 70%) are due for a major repair. After the main repair of the facility, the operation rate is expected to increase and the operating cost is expected to decline due to energy recovery. Inspection and repair should be carried out in a timely manner to increase incineration and heat energy recovery efficiencies.

Domestic automotive shredder residue (ASR) recycling facilities must comply with 60% of the energy recovery criteria calculated by the waste control act, based on resource circulation of electrical and electronic equipment and vehicles. The method of calculating energy recovery criteria was newly enacted on November 6, 2017, and it has been judged that it is necessary to consider applicability. In this study, the energy recovery efficiency of 7 units was calculated by past and present calculation methods. Furthermore, this study attempts to find applicability and a method of increasing the energy recovery efficiency by taking advantage of available potentials. An analysis of the calculation results showed that the average values calculated by past methods, present methods, and the method that includes available potentials are 76.35%, 70.68%, and 78.24%, respectively. Therefore, the new calculation method for energy recovery efficiency is also applicable to domestic automotive shredder residue recycling facilities.

In the past, the role of incineration facilities was mainly to reduce waste and stabilize disposed material. However, as a key aspect of waste management policy, the concept of “waste Minimization and sustainable resource circulation society” has become an issue, and the effective use of waste has been emphasized. As a result, to promote the recycling of wastes from January 1, 2018, the Framework Act on Resource Circulation has been implemented. In this study, estimation factors that can affect the increase of energy recovery are selected by reviewing the estimation method of industrial waste incineration facilities having a separate boiler; moreover, the effect of calculation factors on energy recovery was quantitatively evaluated. According to this study, when the heat loss, condensate temperature, and power consumption decrease by 10%, the energy recovery of the target facilities increase by 0.4% (0.22 ~ 0.63%), 1.09% (0.57 ~ 1.32%), and 1.16% (0.52 ~ 2.13%) on an average.

Insulation materials used for building save energy and can be classified into inorganic and organic materials. Organic insulation emits toxic gases in a fire and has lower water resistance. Inorganic insulation is heavy and has poorer thermal performance than that of organic material. This study evaluated the physical properties and fire resistance of lightweight inorganic insulation foaming material made of waste glass powder. The test results showed that the inorganic material performed well with low density and low thermal conductivity for an insulation material. Foam insulation material manufactured from glass powder was sufficient as a fire-resistant product.