• Title/Summary/Keyword: Aeration system

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Effect of Aeration on Fertilization and Sludge Accumulation of Pig Slurry (돼지분뇨 슬러리 액비화시 폭기가 액비특성 및 슬러지 형성에 미치는 영향)

  • Jeong, Kwang-Hwa;Khan, Modabber Ahmed;Lee, Myung-Gyu;Kim, Jung-Gon;Han, Duk-Woo;Kwag, Jung-Hun
    • Journal of Animal Environmental Science
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    • v.19 no.1
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    • pp.47-54
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    • 2013
  • Two types of reactors were set to investigate the change of characteristics of pig slurry by aeration during fertilization period. One system was equipped with air diffuser to supply oxygen to pig slurry for liquid fertilization, but there was no air diffuser in the other system. Air supply to the experimental systems was regulated by air flow meter. The reactors were set up in the laboratory to protect the pig slurry from external condition such as temperature and humidity changes. Maintaining optimal pH range in the experimental reactors is an important factor for liquid fertilization of pig slurry. In this study, pH ranges of aerobic reactor and anoxic reactor was 7.04~7.19 and 7.34~7.81, respectively. The temperature of aerobic reactors was $2{\sim}3^{\circ}C$ higher then indoor temperature. The amount of sludge accumulated at the bottom layer of non-aerated reactors was 4~5 times more than that of aerated reactors.

Effect of Salinity on Dissolved Oxygen Characteristics in an Ejector-Aerator (이젝터-폭기 시스템의 용존산소특성에 미치는 염도의 영향)

  • Yang, Hei-Cheon;Park, Sang-Kyoo
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.5
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    • pp.640-646
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    • 2011
  • Dissolved oxygen (DO) refers to the volume of oxygen that is contained in water, and is a major indicator of water quality. The objective of this paper was to investigate the effect of salinity on the dissolved oxygen characteristics in an ejector-aerator. An experimental aeration system composed of a motor-pump, an ejector, a motor-blower, a set of aeration and recirculation tank and a control panel. The dissolved oxygen concentrations decreased with the water salinity. The volumetric mass transfer coefficient increased with increasing the water salinity.

Evaluation of Continuously and Intermittently Aerated Hog Manure Compost Stability in a Pilot-scale Bin Composting System (파일럿 규모 빈 퇴비화 시스템에서 연속 및 간헐 통기 돈분 퇴비의 안정도 평가)

  • Hong, Ji-Hyung
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.40 no.5
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    • pp.100-108
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    • 1998
  • Compost stability represents the state of microbiological activity and measurements of respiration either through $CO_2$ evolution or $O_2$ uptake should provide the best indication of this state. Hog manure amended with sawdust was composted in a pilot-scale reactor vessels using continuous and intermittent aeration for 3 weeks. In this study we evaluated the $CO_2$ respiration rate effect of aeration method on the reduction of $CO_2$ evolution, and investigated the stability of fresh and finished compost for plant growth. The intermittently aerated composting is a practical proposition for a very stable compost making. The $CO_2$ respiration rate in the fresh and finished compost during intermittently aerated composting was maintained from 0.3 to 1.4 and was good for use in horticulture, while the continuously aerated composting was 7 to 23 and needed more time for compost curing.

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시멘트 Silo 적분 생성 억제 및 안전화 대책

  • 양승혁;이병곤
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2002.05a
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    • pp.28-32
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    • 2002
  • 본 연구는 시멘트 저장 silo 내부의 적분(Coating) 청소(제거) 작업시 지속적으로 발생하는 적분 붕괴로 인한 산업사고 예방에 목적이 있다, 연구에서 제시된 개선방안의 골자는 시멘트 인출을 위해서 silo 내부로 공기를 송급하는 Aeration system에 냉동식 미압 air dryer를 적용하여 송급 공기를 제습함으로써 적분생성을 억제하는 것이다.(중략)

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Effect of the Application of a Suspended and a Mixing-in-Pipe Type Aerator on the Liquid Fertilization of Pig Manure Slurry (현수, 배관 내 혼합 폭기방식 적용이 돼지분뇨 슬러리의 액상 비료화에 미치는 영향)

  • Jeong, Kwang Hwa;Kim, Jung-Kon;Khan, Modabber Ahmed;Kwag, Jung-Hoon;Han, Duk-Woo
    • Journal of the Korea Organic Resources Recycling Association
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    • v.22 no.4
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    • pp.62-71
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    • 2014
  • Three types of diffuser systems were manufactured and applied to investigate the effect of liquid fertilization of pig manure slurry by application of aeration processes. In the first type reactor, commonly used diffuser system, which diffuse air upward by diffusing aerator fixed at the bottom of the reactor is installed. In case of the second type, air diffuser is installed 10 cm above of the bottom of a reactor. In the third type reactor, the venturi-type air diffuser is installed at circulation pipe, which return pig slurry in the reactor(mixing-in-pipe process). The pig manure slurry separated to solid/liquid was flowed into the experimental reactor, and left as it for one week to precipitate solids. The concentration of organic matter, T-N, T-P and BOD in the raw pig manure slurry flowed into the reactor of bottom-fixed type aeration process were 1.82%, 4,400 mg/L, 360 mg/L and 13,542 mg/L, respectively. After aeration the concentration of organic matters, T-N, T-P and BOD in the slurry were 2.01%, 4,400 mg/L, 420 mg/L and 16,824 mg/L, respectively. The concentration of organic matter, T-N, T-P and BOD in the mixing-in-pipe type changed from 1.58%, 3,700 mg/L, 260 mg/L and 15,735 mg/L to 1.96%, 4,000 mg/L, 340 mg/L, and 18,098 mg/L, respectively. Changes of the concentration of organic matter, T-N, T-P and BOD of the pig manure slurry collected from the middle layers of two aeration reactors; bottom aeration process and the mixing-in-pipe process, were 10.4%, 0%, 16.7% and 24.2% and 24.0%, 8.1%, 30.8% and 15.0%, respectively. The thickness of foam layer generated on the surface of pig manure slurry in aeration tank was thinner in mixing-in-pipe reactor than bottom-fixed type aeration reactor.

Effect of SCODMn and pH Adjustment on Physicochemical Characteristics in Liquid Fertilizer Production Process Using Swine Manure (SCODMn 농도 및 pH 조정이 양돈분뇨의 후숙발효과정에 미치는 이화학적 영향)

  • Hong, In-Gi;Kim, Soo-Ryang;Lee, Myung-Gyu
    • Journal of Animal Environmental Science
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    • v.18 no.sup
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    • pp.13-20
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    • 2012
  • This research investigated the effect of $SCOD_{Mn}$ concentrations and pH adjustment at the stage before land application, namely 2nd-aeration treatment stage of liquid fertilizer in the liquid fertilizer treatment process of swine manure on the physicochemical compositions of 2nd-aeration treated liquid fertilizer. The liquid fertilizer used in this research is the alkaline fermented liquid fertilizer of swine manure more than pH 9.0 through aeration treatment (Alkaline fermentation treatment group). About the alkaline liquid fertilizer, phosphate neutralization treatment was conducted with phosphoric acid and it was a phosphate neutralization treatment group. In 2nd-aeration treatment of liquid fertilizer for 30 days, each group was divided into alkaline treatment groups (T-1, T-2, and T-3) and phosphate neutralization treatment groups (T-4, T-5, and T-6) according to early $SCOD_{Mn}$ concentrations. The research results are as follows. 1. As for $SCOD_{Mn}$ reduction rate, the average 29.9% in alkaline treatment groups and the average 36.9% in phosphate neutralization treatment groups were shown and so the relatively high reduction rate was shown in phosphate neutralization treatment groups. 2. After finishing the experiment, the group of the lowest $SCOD_{Mn}$ concentrations was the phosphate neutralization treatment group, T-6 with the lowest inflow concentrations. In case the final goal level of 2nd-aeration treated liquid fertilizer is assumed as concentrations less than $SCOD_{Mn}$ 3,000 ppm, it would be desired that inflow concentrations of 2nd-aeration treatment groups are adjusted less than $SCOD_{Mn}$ 5,500 ppm. 3. As for the persistence rate of nitrogen, the average 29.3% in alkaline treatment groups and the average 38.9% in phosphate neutralization treatment groups were shown and so phosphate neutralization treatment groups showed the relatively low loss rate of nitrogen, meanwhile, in the case of T-P, phosphate neutralization treatment groups maintained high concentrations (average 1,473 ppm). 4. In the event of 2nd-aeration treatment of liquid fertilizer, "alkaline fermentation treatment" condition in 'low phosphate-low nitrogen' type and "phosphate neutralization treatment" condition in 'high phosphate-high nitrogen' type are expected to be favorable.

A Study on the Field Application of Intermittently Aerated Activated Sludge Process for Water Reuse System (간헐포기 활성슬러지 중수처리공정의 현장적용 연구)

  • Seo, In-Seok;Kim, Byung-Goon;Park, Seung-Kook;Kwon, Sun-Woong
    • Journal of Korean Society on Water Environment
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    • v.16 no.4
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    • pp.513-521
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    • 2000
  • Intermittently aerated activated sludge process was applied as a water reuse process of $70m^3/day$ for the upgrade of organic, nitrogen and phosphorus removal efficiency and clarifier performance. After application of the intermittently aeration, removal efficiency of BOD, SS, T-N and T-P were achieved 95%, 90%, 80% and 60%, respectively. Removal efficiencies in intermittently aerated process were considerably increased. comparing to those of continuously aerated activated sludge process. Also sludge rising problem in clarifier was improved. Average concentration of supplied reusing water were BOD 5 mg/L, turbidity 4 NTU and after chlorination, residual chlorine 0.4 mg/L, coliform 0 MPN/100mL. Intermittently aerated activated sludge process could be one of the best alternative process for the retrofit of conventional activated sludge process for the removal of nutrient in water reuse system.

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Characteristics of TPH Decomposition in a Close-typed Simulated Biopile System Amended with a Sintered Porous Media (소결다공체를 적용한 Closed Type 모사바이오파일시스템의 TPH 분해 특성)

  • Jung, Hyun-Gyu;Choi, Sang-Il;Kim, Hye-Jin;Kim, Sang-Kook;Kim, Yu-Beom
    • Korean Journal of Soil Science and Fertilizer
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    • v.44 no.3
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    • pp.415-424
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    • 2011
  • This research was conducted to verified the effectiveness of a sintered porous media coated with organic matter as nutrient source and microorganisms as decomposer effective in TPH decomposition for a closed-typed biopole system. The organic matter content in the sintered porous media which was developed with bentonite increased with increasing dilution ratio of pig slurry and the sintered porous media as well as decrease in the particle size of sintered porous media. The decomposition rate of TPH was significantly increased with increasing aeration than that under atmospheric condition. Also the sintered porous media containing organic matter and microorganisms proved that the decomposition was enhanced with addition of nutrients sources in addition to aeration periodically.

Improvement of Unsaturated Fatty Acid Production from Porphyridium cruentum Using a Two-Phase Culture System in a Photobioreactor with Light-Emitting Diodes (LEDs)

  • Kim, So Hee;Lee, Ui Hun;Lee, Sang Baek;Jeong, Gwi-Taek;Kim, Sung-Koo
    • Journal of Microbiology and Biotechnology
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    • v.31 no.3
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    • pp.456-463
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    • 2021
  • In this study, the culture conditions for Porphyridium cruentum were optimized to obtain the maximum biomass and lipid productions. The eicosapentaenoic acid content was increased by pH optimization. P. cruentum was cultured with modified F/2 medium in 14-L photobioreactors using a two-phase culture system, in which the green (520 nm) and red (625 nm) light-emitting diodes (LEDs) were used during the first and second phases for biomass production and lipid production, respectively. Various parameters, including aeration rate, light intensity, photoperiod, and pH were optimized. The maximum biomass concentration of 0.91 g dcw/l was obtained with an aeration rate of 0.75 vvm, a light intensity of 300 μmol m-2s-1, and a photoperiod of 24:0 h. The maximum lipid production of 51.8% (w/w) was obtained with a light intensity of 400 μmol m-2s-1 and a photoperiod of 18:6 h. Additionally, the eicosapentaenoic acid and unsaturated fatty acid contents reached 30.6% to 56.2% at pH 6.0.

Rational budgeting approach as a nutrient management tool for mixed crop-swine farms in Korea

  • Reza, Arif;Shim, Soomin;Kim, Seungsoo;Ahn, Sungil;Won, Seunggun;Ra, Changsix
    • Asian-Australasian Journal of Animal Sciences
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    • v.33 no.9
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    • pp.1520-1532
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    • 2020
  • Objective: Due to rapid economic return, mixed crop-swine farming systems in Korea have become more intensive. Intensive farming practices often cause nutrient surpluses and lead to environmental pollution. Nutrient budgets can be used to evaluate the environmental impact and as a regulatory policy instrument for nutrient management. This study was conducted to select a nutrient budgeting approach applicable to the mixed crop-swine farms in Korea and suggest an effective manure treatment method to reduce on-farm nutrient production. Methods: In this study, we compared current and ideal gross nutrient balance (GNB) approaches of Organisation for Economic Co-operation and Development and soil system budget (SSB) approach with reference to on-farm manure treatment processes. Data obtained from farm census and published literature were used to develop the farm nutrient budgets. Results: The average nitrogen (N) and phosphorus (P) surpluses were approximately 11 times and over 7 times respectively higher in the GNB approaches than the SSB. After solid-liquid separation of manure, during liquid composting a change in aeration method from intermittent to continuous reduced the N and P loading about 50% and 47%, respectively. Although changing in solid composting method from turning only to turning+aeration improved the N removal efficiency by 30.5%, not much improvement in P removal efficiency was observed. Conclusion: Although the GNB approaches depict the impact of nutrients produced in the mixed crop-swine farms on the overall agricultural environment, the SSB approach shows the partitioning among different nutrient loss pathways and storage of nutrients within the soil system; thus, can help design sustainable nutrient management plans for the mixed cropswine farms. The study also suggests that continuous aeration for liquid composting and turning+aeration for solid composting can reduce nutrient loading to the soil.