• 농업과학연구
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• 제43권3호
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• pp.424-431
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• 2016

The nutrients in livestock manure produced during fermentation processes in public livestock recycling centers are used as fertilizers. However, the large amounts of swine manure produced in intensive livestock farms can be a nonpoint source of pollution. In this experiment, we investigated the chemical properties, inorganic components, and heavy metal contents in 101 samples of liquid swine manure collected from 28 public livestock recycling centers throughout the nation. Results showed that the average pH of the samples was alkaline (pH range 5.18 to 9.54), and their maximum EC was $53.2dS\;m^{-1}$. The amounts of total nitrogen and total phosphorus were in the range of 1000 - 2000 and $200-800mg\;L^{-1}$ while potassium, which constituted 47% of the total inorganic ions recovered from the liquid swine manure, amounted to $1500mg\;L^{-1}$. The most distinctive heavy metals recovered from the liquid swine manure were copper and zinc although the amounts of both heavy metals were much lesser than those of the standards as livestock liquid fertilizer set by the Rural Development Administration. On the other hand, the amount of nitrogen decreased rapidly with an increasing fermentation period from immature to mature, assumed to be lost as volatile compounds, such as ammonia, which are the major odor components during the fermentation process.

• Animal Bioscience
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• 제35권2호
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• pp.308-316
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• 2022

Objective: This study was conducted to determine reduction of various odorous materials from a swine farm equipped with a continuous pit recirculation system (CPRS) with aerobically treated liquid manure. Methods: The CPRS is used in swine farms in South Korea, primarily to improve air quality in pig houses. In this study, CPRS consists of a manure aerobic treatment system and a fit recirculation system; the solid fraction is separated and composted, whereas the aerobically treated liquid fraction (290.0%±21.0% per day of total stored swine slurry) is continuously returned to the pit. Four confinement pig barns in three piggery farms were used; two were equipped with CPRS and the other two operated a slurry pit under the slatted floor. Results: All chemical contents of slurry pit manure in the control were greater than those of slurry pit manure in the CRPS treatment (p<0.05). Electrical conductivity and pH contents did not differ among treatments. The biological oxygen demand of the slurry pit treatment was greater than that of the other treatments (p<0.05). Total nitrogen, total phosphorus, and ammonia nitrogen contents of the slurry pit treatment were greater than those of other treatments (p<0.05). Odor intensity of the CPRS treatment was lower than that of the control at indoor, exhaust, and outside sampling points (p<0.05). The temperature and carbon dioxide of the CPRS treatment in the pig barn was significantly lower than those of control (p<0.05). All measured odorous material contents of the CPRS group were significantly lower than those of the control group (p<0.05). Conclusion: The CPRS application in pig farms is considered a good option as it continuously reduces the organic load of animal manure and lowers the average odorant concentration below the threshold of detecting odorous materials.

• Asian-Australasian Journal of Animal Sciences
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• 제30권6호
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• pp.797-803
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• 2017

Objective: Effects of nitrogen supplementation associated with different levels of starch on voluntary intake, digestibility, and rumen and metabolic characteristics of cattle fed low-quality tropical forage (Brachiaria decumbens hay, 7.4% crude protein, CP) were evaluated using ruminal and abomasal cannulated steers. Methods: Five European${\times}$Zebu young bulls (186 kg body weight, BW) were distributed according to a $5{\times}5$ Latin square. The following treatments were evaluated: control, supplementation with 300 g CP/d (0:1), supplementation with 300 g starch/d and 300 g CP/d (1:1), supplementation with 600 g starch/d and 300 g CP/d (2:1), and supplementation with 900 g starch/d and 300 g CP/d (3:1). A mixture of nitrogenous compounds provided 1/3 from true protein (casein) and 2/3 from non-protein nitrogen (mixture of urea and ammonium sulphate, 9:1) was used as the nitrogen supplement. In order to supply energy a unique source of corn starch was used. Results: Supplements increased (p<0.05) dry matter intake, but did not affect (p>0.05) forage intake. There was a cubic effect (p<0.05) of starch on voluntary intake. This was attributed to the highest forage intake (g/kg BW) when using the 2:1 starch:CP ratio. Supplements increased (p<0.05) organic matter (OM) digestibility, but did not affect (p>0.05) neutral detergent fibre corrected for ash and protein (NDFap) digestibility. There was a positive linear effect (p<0.05) of the amount of starch supplemented on OM digestibility. Total NDFap digestibility was not affected (p>0.05) by the amount of supplemental starch. Ruminal ammonia nitrogen concentrations were higher (p<0.05) in supplemented animals, however, a negative linear effect (p<0.05) of amount of starch was observed. Supplements increased (p<0.05) the nitrogen balance (NB) and efficiency of nitrogen utilization. These effects were attributed to increased body anabolism, supported by higher (p<0.05) serum concentration of insulin-like growth factor 1. Increasing the amount of starch tended (p<0.06) to linearly increase the NB. In spite of this, there was a highest NB value for the 2:1 starch:CP ratio amongst the treatments with supplementation. Conclusion: Nitrogen supplementation in cattle fed low-quality tropical forage increases nitrogen retention in the animal's body. An additional supply of starch increases nitrogen retention by increasing energy availability for both rumen and animal metabolism.

• Applied Biological Chemistry
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• 제18권1호
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• pp.1-9
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• 1975

Aspergillus sojae를 사용(使用)하여 제조(製造)한 Koji와 Bacillus subtilis를 사용(使用)하여, 제조(製造)한 Natto의 배합비(配合比)를 달리하여, 그 효소역가(酵素力價)를 검토(檢討)하고 Koji와 Natto의 配合比를 10 : 0, 8 : 2, 6 : 4, 4 : 6, 2 : 8, 0 : 10으로 하여 담근 간장을 3개월간(個月間) 숙성(熟成)시키면서 숙성기간중(熟成期間中)의 화학성분변화(化學成分變化)를 조사(調査)하고 3개월간(個月間) 숙성(熟成)시킨 간장덧액(液)에 대하여 식미시험(食味試驗)을 행(行)하여 다음과 같은 결과(結果)를 얻었다. 1. Koji 제조중(製造中)의 pretense activity는 시간(時間)이 경과(經過)함에 따라 꾸준한 증가(增加)를 보여 60 시간(時間)에 가서 44 tyrosine ${\mu}g$/ml 인데 비(比)해 Natto 제조중(製造中)의 pretense activity는 급격(急激)한 증가(增加)를 보며 배양(培養) 15시간(時間)만에 이미 46 tyrosine ${\mu}g$/ml 였으며, 30시간(時間)배양(培養)으로 99 tyrosine ${\mu}g$/ml 에 이르렀다. 한편, amylase activity는 Natto 제조중(製造中) 시간(時間)이 경과(經過)함에 따라 약간(若干)의 증가(增加)를 보였으나 Koji 제조중(製造中)에는 30시간경(時間頃)까지 급격(急激)한 증가(增加)를 보이고 그 이후(以後) 비교적(比較的) 완만(緩慢)하게 증가(增加)하였으나 전기간(全期間)을 통(通)하여 Natto 에 비(比)하여 월등(越等)히 높았다. 2. Koji와 Natto를 일정(一定)한 비(比)로 배합(配合)하했을 때 pretense activity Natto의 배합량(配合量)이 많을수록 점차(漸次) 높았고 amylase activity는 Koji의 배합량(配合量)이 많을수록 높아졌다. 3. 총질소(總窒素)는 모든 시험구(試驗區)에서 숙성(熟成) 2개월경(個月頃)까지 급격(急激)한 증가(增加)를 보이다가, 그 이후(以後) 거의 일정치(一定値)를 유지(維持)하였으며 Natto 배합비(配合比)가 많은 시험구(試驗區)일수록 높은 값을 보이면서 증가(增加)하였다. 4. amino 태질소(態窒素)는 전구(全區)가 다같이 숙성기간(熟成期間)이 경과(經過)함에 따라 대체(大體)로 증가(增加)되였는 데 그 함량(含量)은 Natto의 배합량(配合量)이 많은 구(區)일수록 높은 값을 나타냈다. 5. ammonia태질소(態窒素)는 Koji단용구(單用區) 및 Koji와 Natto, 의 배합비(配合比)가 8 : 2인 구(區)는 숙성기간(熟成期間)이 경과(經過)함에 따라 계속 대체(大體)로 완만(緩慢)한 증가(增加)를 보였으나 Natto단용구(單用區) 및 Koji와 Natto의 배합비(配合比)가 6 : 4, 4 : 6, 2 : 8인 구(區)는 숙성(熟成) 1$\sim$2 개월(個月)까지는 급격(急激)히 증가(增加)하였다가 그 이후(以後)는 감소(減少)되였는데 전반적(全般的)으로 Natto의 배합비(配合比)가 많을수록 높은 함량(含量)을 보였다. 6. 환원당(還元糖)은 모든 구(區)가 숙성(熟成) 2개월(個月)까지 대체(大體)로 현저(顯著)하게 증가(增加)되였으나 그이후(以後)는 감소(減少)되였는데 저구(全區) 다같이 환원당(還元糖)의 함량(含量)은 Koji의 배합비(配合比)가 많을수록 높았다. 7. 총산(總酸)은 Koji 단용구(單用區) 및 Koji와 Natto의 배합비(配合比)가 8 : 2인 구(區)는 숙성기일(熟成期日)이 지남에 따라 계속 증가(增加)되였으나 Natto의 배합량(配合量)이 비교적(比較的) 많은 구(區)일수록 숙성(熟成) 50$\sim$70일경(頃)까지 급격(急激)한 증가(增加)를 보이다가 그 이후(以後)는 감소(減少)하였다. pH는 전구(全區) 다같이 숙성(熟成) 50일(日)까지 저하(低下)되었다가 그이후(以後) 큰 변화(變化)가 없었다. 8. 3개월(個月) 숙성(熟成)시킨 간장에 대(對)한 관능시험결과(官能試驗結果)는 Koji와 Natto의 배합비(配合比)가 6 : 4일때 기호도(嗜好度)가 가장 높았고 이들 배합비(配合比)가 8 : 2, 10 : 0, 4 : 6, 2 : 8, 0 : 10의 순서(順序)로 낮았으며 Natto를 일정량(一定豊) 배합(配合)한것이 Koji단용구(單用區)와 Natto단용구(單用區)보다 우수(優秀)함을 알수 있었다.

• Asian-Australasian Journal of Animal Sciences
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• 제14권7호
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• pp.974-978
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• 2001

The effect of three varying ratios (high, medium and low) of Rumen Degradable Protein (RDP) to Undegradable Dietary Protein (UDP) of 37:63, 52:48 and 70:30 in iso-nitrogenous and iso-caloric concentrate mixtures on rumen fermentation profile was studied using rumen fistulated Jersey crossbred cows. Rumen pH and ammonia nitrogen concentration were found to be lower with a concentrate mixture containing a higher UDP level of 63.38% when compared with those having medium and low UDP levels of 47.55 and 29.75%, respectively, at all post feeding intervals. Total volatile fatty acid concentration as well as concentrations of individual fatty acids viz., acetate, propionate and butyrate were also found higher in animals fed concentrate mixture with the highest UDP level.

• Asian-Australasian Journal of Animal Sciences
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• 제10권4호
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• pp.398-401
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• 1997

A caecal fermentation study was conducted in 30 Angora rabbits equally placed under five whole diets (75 concentrate : 25 roughage) supplemented with processed Neem (Azadirachta indica) kernel meal (NKM ; 2% urea or 1.5% NaOH, W/W), replacing isonitrogenously either at 50 or 100% level of deoiled peanut (Arachis hypogea) meal, for 18 wk period. The total volatile fatty acids level was depressed (p < 0.05) in all the experimental groups (0.02 to 0.04 mEq/g) and ammonia-nitrogen was lowest (p < 0.05; $24.9{\mu}mol/g$) in rabbits fed NaOH treated NKM supplemented diet. Enzyme activity (unit/g) of carboxy methyl-cellulase, ${\alpha}$-amylase, protease and urease exhibited much variation and did not differ significantly. Hence, the results could not confirm a possible adverse effect of feeding NKM on caecal fermentation.

• 한국대기환경학회지
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• 제14권2호
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• pp.107-116
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• 1998

Coal gasification fuel has generally a lower calorific values than natural gas and also contains ammonia which is a main source of fuel NOx. Such a fuel is in need of the advanced technologies for the NOx reduction with higher combustion efficiency. Therefore fuel staged combustion was investigated for the fuel NOx control using a bench scale gas combustoi for the fuel NOx control. Parametric screening studies were performed with the variation of air ratio, retention length and reburning fuel. The NOx reduction efficiency was increased with an increase of total air ratio having optimum reburning air ratio differently, The Increased retention length of the reburning zone was preferable for NOx reduction. Hydrocarbonic reburning fuels like propane and butane were more effective for the NOx reduction efficiency than hydrogen fuel. The NOx concentration at exit was linearly increased according to the fuel-N the fuel.

• 환경위생공학
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• 제12권1호
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• pp.69-75
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• 1997

Biological drinking water treatment is widely used in Europe for the removal of ammonia nitrogen and organics. During the last 16 years, the deterioration of the quality of surface waters used to produce drinking water has resulted in the widespread use of ozone-biological treatment in Korea. This study were conducted to determine the effect of media weight and preozonation on the biodegradability enhancement in biological fluidized bed(BFB) using Han river water. When the carbon weight was increased, $NH_{3}-N$ and DOC removal increased, but turbidity and SS removal decreased. To remove turbidity and SS, the bed depth in 40% expansion rate/total bed depth was very important. Preozonation of raw water was not effective in $NH_{3}-N$, but increased in biodegradable organic fraction about 10-30% with 0.425-0.85 mg $O_{3}/mg$ DOC.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2002년도 생물공학의 동향 (X)
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• pp.343-345
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• 2002

This study was performed by the airlift bioreactor using the nitrifier consortium entrapped in polyvinyl alcohol(PVA) for removing low concentration total ammonia nitrogen(TAN). At the aeration rate of 1.5 vvm, TAN removal rate and removal efficiency was 316.6${\pm}$7.2 $g/m^3$ day and 92.8${\pm}$2.2%. Removal rate was continuously increased with decreasing from 0.5hr to 0.05hr of hydraulic residence time(HRT), whereas removal efficiency was decreased with decreasing HRT.

• 한국유기농업학회지
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• 제9권3호
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• pp.93-101
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• 2001

This study was conducted to evaluate chemical parameters on butchery wastes as a bulking agent in composting of swine manure. Treatments included T1 : Swine manure + Rice hull, T2 ; Swine manure + Rice hull + Vermiculite, T3 ; Swine manure + Rice hull + Perlite, T4, Swine manure + Vermiculite, T5 : Swine manure + Vermiculite + Perlite, T6 ; Swine manure + Perlite, T7 ; Swine manure + lice hull + Vermiculite + Perlite. During the composting period, changes of temperature and pH were showed traditionally composting trend. Moisture, organic matter, total nitrogen and C/N ratio were higher rice hull than vermiculite and perlite treatments. Ammonia-N and EC were not differences among the treatments. In heave metal, Cd and Cr were showed higher in vermiculite treatments than other treatments. Rice hull treatments were decreased volatile fatty acids compared to that of other treatments. In conclusion, rite hull containing high organic content was greater composting effects than vermiculite and perlite containing low organic content.