• Title/Summary/Keyword: 고형물 농도

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Removal of Suspended Solids in Aquacultural Recirculating Water by Magnetic Fluid Separation (자성 유체분리에 의한 양어장 순환수내 부유 고형물의 제거)

  • KIM Yong-Ha;YEO Ryoung-Mo;SUH Kuen-Hack;KIM Hang-Goo;CHUNG Uoo-Chang;KIM Soon-Ho
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.32 no.5
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    • pp.649-653
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    • 1999
  • A magnetic fluid separation technology was confirmed to be very effective to remove the suspended solids (SS) from aquacultural recirculating water, In this study, the effects of operating variables on the characteristics of SS removal were investigated through the test runs using magnetite of 2 $\mu$m mean diameter as magnetic powder. Magnetic flocculation here formed by adsorbing fine magnetites on the surface of suspended solid was observed. The strength of magnet was of significance in determining the SS removal efficiency as well as the capacity of the equipment. In addition, the SS removal efficiency decreased with an increase in the superficial liquid velocity, but the effect became negligible when the mass ratio of magnetite to the suspended solids was higher than 1.0.

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Effect of Methane Production from Pig Manure Slurry According to The Solids Concentration and The Crushing Solids of Pig Manure Slurry (돼지분뇨 슬러리중의 고형물 농도수준과 분쇄 처리가 메탄 생성에 미치는 효과)

  • Jeong, Kwang-Hwa;Kim, Jung-Kon;Lee, Dong-Jun;Lee, Dong-Hyun;Cho, Won-Mo
    • Journal of the Korea Organic Resources Recycling Association
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    • v.23 no.4
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    • pp.74-85
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    • 2015
  • Recently, the number of anaerobic digestion facility for livestock manure is on the rise in Korea. All of the livestock manure anaerobic digestion facilities in operation use pig manure slurry as a substrate for anaerobic digestion. Generally, pig manure slurry is composed of 97% water and 3% solids. The particulate matter, such as corn in the form of particles that is undigested by pig is contained in the pig manure slurry. Particulate matter is a factor reducing the effectiveness of biogas production in the anaerobic digestion process. In this study, mechanical grinding treatment was applied to analyze the effect of methane production from pig manure slurry by reducing the particle size of the slurry. On the other hand, the effect of the solid concentration levels on methane production and methane content of the biogas was analyzed. The fine particle concentration in the pig manure slurry was increased by the mechanical grinding treatment. And methane production and methane content of the biogas were higher in grinded pig manure slurry than untreated raw slurry.

Night Soil Treatment by Anaerobic Sequencing Batch Reactor (혐기성 연속 회분식 반응조에 의한 분뇨처리)

  • 허준무;박종안
    • Journal of environmental and Sanitary engineering
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    • v.15 no.2
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    • pp.75-84
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    • 2000
  • 운전 온도 $35^{\circ}C$, 평균 유기물부하 $3.1{\;}kgCOD/m^3/day$ 및 수리학적체류시간 10일에서 혐기성 연속회분식공정에 의한 분뇨처리를 수행하였다. 공정의 평가는 대조 소화조로 완전혼합형의 소화조와 병행하여 수행되었다. 본 실험에서 분뇨는 고농도의 암모니아성 질소와 침전성 고형물을 함유하고 있음에도 불구하고 희석 없이 소화가 가능하였다. 혐기성 연속회분식공정에서 고형물은 급속하게 증가하여 완전혼합형의 대조 소화조에 비하여 소화조내 고형물(biomass)의 농도가 2.4배로 증가하였고, 가스발생량에 있어서도 대조 소화조에 비해 현격한 증가를 보였으며 그 증가율은 205~220%에 달했다. 부가적인 침전 시설이 없이도 혐기성 연속회분식공정의 유출수질이 대조 소화조 보다 높게 나타났는데 상징액 기준으로 휘발성고형물 제거율은 혐기성 연속회분식공정이 대조 소화조 보다 12~14% 높았다. 한편, 혐기성 연속회분식공정의 운전인자로 반응/침강비(R/T ratio)를 조사한 결과 R/T비가 1인 경우가 3의 경우보다 가스발생량, 메탄함량 및 유기물 제거율이 약간 높았으나 큰 차이는 없었다. 위의 실험결과들로부터 혐기성 연속회분식공정은 고농도의 암모니아성 질소와 침전성 유기물을 함유하고 있는 분뇨의 처리에 효과적이고 안정적인 공정으로 판단된다.

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Survey on electrocoagulation to purify contaminated water (전기응고법을 이용한 오염 수 정화)

  • Kim, W.Y.;Park, K.S.;Oh, C.S.
    • Journal of Energy Engineering
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    • v.23 no.3
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    • pp.17-20
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    • 2014
  • A magnetic fluid separation technology was confirmed to be very effective to remove the suspended solids from contaminated water. We have surveyed on the effects of operating variables on the characteristics of suspended solids(SS) removal investigated through the test runs using magnetic powder. Magnetic flocculation here formed by adsorbing fine magnetites on the surface of suspended solid was observed. The strength of magnet was of significance in determining the SS removal efficiency.

Thickening of Activated Sludge Using Low Pressure Flotation Pilot System (파일롯 규모의 저압형 부상장치를 이용한 하수슬러지 농축에 관한 연구)

  • Kim, Ji Tae;Oh, Joon Taek;Kim, Jong Kuk
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.3
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    • pp.172-177
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    • 2014
  • Low pressure air flotation (LAF) pilot plant for sludge thickening was installed in Chung Nam N.S. municipal waste water treatment plant to verify its application possibility. Effects of operating conditions such as coagulant dosages and microbubble water ratio on thickening of the mixed sludge were examined. Microbubbles which were generated in the chamber of $1.5kgf/cm^2$ by high speed collision method with foaming agent were used to float sludge. Solid loading of $30kg/m^2/hr$, solid contents in thickened sludge of 60,300 mg/L and SS removal efficiency of 99% were obtained through long period operating LAF in conditions of mixed sludge concentration of 14,400 mg/L, coagulant dosage of 27.6 mg/L, foaming agent addition of 4.0 mg/L and microbubble water injection ratio of 9.7%.

Manufacture of Garlic Juice and Prediction of its Boiling Point Rise (마늘 착즙의 제조 및 비점 상승의 추정)

  • Kim, Byeong-Sam;Park, Noh-Hyun;Park, Moo-Hyun;Han, Bong-Ho;Bae, Tae-Jin
    • Korean Journal of Food Science and Technology
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    • v.22 no.4
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    • pp.486-491
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    • 1990
  • To develop a new spice material garlic juice was prepared from peeled garlic and its composition, density and boiling point rise were investigated. Major components of the garlic juice were moisture(68.01%), crude protein(6.50%) and carbohydrate(25.39%). Yield of the juice from the peeled whole garlic was 49.50%(w/w). Density of the garlic juice with solid content of 32 to $65^{\circ}$ Brix was in the range of 1,107 to $1,243kg/m^3$. Boiling point rise of garlic juice increased exponentially with the increase of solid content. In the solid content range of 32 to $65^{\circ}$ Brix, the boiling point rise could be predicted with following experimental equation with average error of less than 7%. $$BPR=1.4105.\;P^{0.1338}.\;exp(0.0357.\;X_5-1.3925)$

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T-P Removal Efficiency According to Coagulant Dosage and Operating Cost Analysis (응집제 투입에 따른 인 제거 효율 및 운영비용 분석)

  • Yun, Soyoung;Ryu, Jaena;Oh, Jeill
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.8
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    • pp.549-556
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    • 2012
  • T-P removal efficiency was analyzed according to the metal to initial T-P ratio (mole basis) with respect to the samples from different WWTPs having various initial T-P and SS conditions. Also, operating costs were calculated based on the injected coagulant amount and the amount of sludge production. Most experiments were conducted by the standard jar-test protocol. Molar ratio of coagulant dose was varied considerably according to the initial SS concentration range in secondary clarifier effluent samples which had above 0.5 mg/L of initial T-P. Based on 90% T-P removal efficiency, results were: At the initial SS range of below 10 mg/L, Alum (8%) = 11 mol Al/mol P needed and PAC (17%) = 9.6 mol Al/mol P needed; At the initial SS range of above 10 mg/L, Alum (8%) = 3.9 mol Al/mol P needed and PAC (17%) = 3.2 mol Al/mol P needed.

Experimental Investigation of the Development of a Rotor Type Slurry Pump (로터형 슬러리 펌프 개발을 위한 실험적 연구)

  • Park, Sang-Kyoo;Yun, Jae-Geun;Yangr, Hei-Cheon
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.4
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    • pp.456-462
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    • 2015
  • The objective of this study was to develop an advanced pump technology using tornado and axial pumping principles without priming water. The developed rotor type slurry pump consisted of an electric motor, driving shaft and coupling, a rotor, an impeller, suction and discharge pipes. For the clean water test, the experimental results are presented for the discharge flowrate, electric power input and vacuum pressure with the rotor design parameters as a function of the motor rpm. The slurry discharge characteristics with the solid concentration of the cement slurry was performed. As the rotor diameter and height increase, the discharge flowrate and electric power input increase while the vacuum pressure in the suction pipe decreases. The rotor thickness had no significant effect on the discharge flowrate and electric power input. Slurries with more than 18 % solid concentration, which is the development factor, can be pumped.

Characteristics of Salted Radish Cubes at Different Season (계절별 절임 무의 특성)

  • Kim, Mee-Ree;Jhee, Ok-Hwa;Park, Han-Young;Chun, Byung-Moon
    • Korean Journal of Food Science and Technology
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    • v.34 no.1
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    • pp.1-7
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    • 2002
  • Characteristics (salt concentration, weight loss, soluble solid content, moisture content, and textural properties) of radish cube $(2{\times}2{\times}2\;cm)$ were evaluated during salting. Three different summer radish cultivars harvested in high land were immersed into 15% brine solution (radish : brine solution = 1 : 2) at $15^{\circ}C$ for 4 h. The time required to reach the optimum salt concentration (3%) was different among cultivars; 3 h for 'Bakbong', 4 h for 'Kwandong' and '92343'. Similar weight loss (about 24-26%) of salted radish cubes was found among cultivars. While the highest value of weight loss of salted radish cubes was observed with '92343', the lowest, 'Bakbong'. Hardness decreased during salting; the highest value of hardness was observer with 'Kwandong', the lowest, 'Bankbong'. The sample of '92343' has the lowest moisture content but has the highest soluble solid content and hardness, while 'Bakbong' has the highest moisture content, but has the lowest soluble solid content and '92343'. In separate experiments, seasonal variations in characteristics of salted radish cubes at optimum salt concentration (3%) were observed: for 'Bakbong', salt concentration, weight loss, soluble solid content, and hardness, and for 'Bakwang', salt concentration, weight loss, and hardness were higher in autumn cultivars than in spring or summer one, while moisture contents of both cultivars were higher in spring or summer cultivars than in autumn one.

Plant Regeneration from Leaf Segment Culture of Chrysanthemum zawadskii ssp. coreanum (한라구절초 잎절편 배양에 의한 식물체 재분화)

  • 박영철;김성용;한태완
    • Korean Journal of Plant Resources
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    • v.17 no.1
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    • pp.43-47
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    • 2004
  • The effect of plant growth regulators and gelling agents for plant regeneration from leaf segment of Chrysanthemum zawadskii ssp. coreanum was investigated. NAA was more effective than BA for plant regeneration. MS medium supplemented with NAA 1 mg/L was the most effective in plant regeneration. The effect of agar and gelite as gelling agent was compared. Agar(0.8%) was more effective than gelite(0.2%) in plant regeneration. Regenerated shoots was successfully increased by shoot grafting in MS medium supplemented with NAA 0.1 mg/L in vitro, and hardened by shoot grafting in artificial soil mix(Peatmoss : Perlite = 1 : 1).