• Title, Summary, Keyword: CSTR

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Kalman Randomized Joint UKF Algorithm for Dual Estimation of States and Parameters in a Nonlinear System

  • Safarinejadian, Behrouz;Vafamand, Navid
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.1212-1220
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    • 2015
  • This article presents a new nonlinear joint (state and parameter) estimation algorithm based on fusion of Kalman filter and randomized unscented Kalman filter (UKF), called Kalman randomized joint UKF (KR-JUKF). It is assumed that the measurement equation is linear. The KRJUKF is suitable for time varying and severe nonlinear dynamics and does not have any systematic error. Finally, joint-EKF, dual-EKF, joint-UKF and KR-JUKF are applied to a CSTR with cooling jacket, in which production of propylene glycol happens and performance of KR-JUKF is evaluated.

Evaluation of Biocatalyst and Bioreactor System for the Continuous Treatment of Trichloroethylene (미생물 생촉매를 이용한 Trichloroethylene 연속처리용 생물반응기 시스템 평가)

  • 이은열
    • Journal of Life Science
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    • v.13 no.6
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    • pp.970-975
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    • 2003
  • Microbial trichloroethylene (TCE) degradation using trickling biofilter (TBF) is a cost-effective treatment method, in which monooxygenase (MO) fortuitously transforms TCE via cometabolism. Simple TBF, however, could not be stably operated for long-term treatment of TCE due to the contradictory characteristics of cometabolism. In this paper, microbial biocatalyst and biofilm reactor system, a two-stage continuous stirred tank reactor (CSTR)/TBF system using Burkholderia cepacia G4 and Methylosinus trichosporium OB3b, are evaluated for the long-term continuous treatment of TCE. The maximum TCE elimination capacities were in the range of 28 and 525 mg TCE/1$.$day. The reactor systems were stably operated for more than 3∼12 months.

Continuous Production of Sorbitol with Zymomonas mobilis in a Packed Bed Reactor (Zymomonas mobilis에 의한 Packed Bed Reactor를 이용한 연속적인 sorbitol의 형성)

  • 장기효;김영복장현수전억한
    • KSBB Journal
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    • v.11 no.1
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    • pp.58-64
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    • 1996
  • The purpose of this study is to develop a continuous process for sorbitol production using Zymomonas mobilis immobilized in K-carra-geenan. The glutaraldehyde cross-linking of toluene-treated cells immobilized in alginate or chitin showed high enzyme stability for long period. However, loss of enzyme activity was observed at 23% during 210h. In order to investigate the stability of glucose-fructose oxidoreductase of cethyltrimethylammoniumbromide (CT AB) treated cells, the long term continuous process was carried out with Z. mobilis immobilized in K-carrageenan in the continuous stirred tank reactor(CSTR) and the packed bed reactor. The continuous production of sorbitol with the immobilized CT AB permeabilized cells in packed bed reactor was more stable than in CSTR. Two stage continuous process with CT AB treated cells of Z. mobilis immobilized in K-carrageenan was carried out at various dilution rates. At the first stage, the productivity was increased up to 15 g/ $\ell$ -h as dilution rate increased and decreased over 0.32$h^{-1}$ of dilution rate. Similarly, maximum productivity obtained at the second stage was 22g/$\ell$ -h at 0.32$h^{-1}$

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Operational Characteristics of the Anaerobic Sequencing Batch Reactor Process at a Thermophilic Temperature (연속 회분식 고온 혐기성 공정의 운전특성 연구)

  • Lee, Jong Hoon;Chung, Tai Hak;Chang, Duk
    • Journal of Korean Society of Water and Wastewater
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    • v.11 no.1
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    • pp.33-41
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    • 1997
  • An attempt was made to enhance anaerobic treatment efficiency by adopting the anaerobic sequencing batch reactor(ASBR) process at a thermophilic temperature. Operational characteristics of the ASBR process were studied using laboratory scale reactors and concentrated organic wastewater composed of soluble starch and essential nutrients. Effects of fill to react ratio (F/R) were examined in the Phase I experiment, where the equivalent hydraulic retention time(HRT) was maintained at 5 days with the influent COD of 10g/L. A continuous stirred tank reactor(CSTR) was operated in parallel as a reference. Treatment efficiency was higher for the ASBRs because of continuous accumulation of volatile suspended solids(VSS) compared to the CSTR. However, the rate of gas production and organic removal per unit VSS in the ASBRs was much lower than the CSTR. This was caused by reduced methane fermentation due to accumulation of volatile acids(VA), especially for the case of low F/R, during the fill period. When the F/R was high, maximum VA was low and the VA decreased in short period. Consequently, more stable operation was possible with higher F/R. Effects of hydraulic loading rate on the efficiency was studied in the Phase II experiment, where the organic loading rate was elevated to 3333mg/L-d with the F/R of 0.12. Reduction of organic removal along with rapid increase of VA was observed and the stability of reaction was seriously impaired, when the influent COD was doubled. However, operation of the ASBR was quite stable, when the hydraulic loading rate was doubled and a cycle time was adjusted to 12 hour. It is essential to avoid rapid accumulation of VA during the fill period in order to maintain operational stability of the ASBR.

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CT Evaluation Program of Ozone Process for Process Diagnosis and Evaluation (오존공정 소독능 프로그램을 활용한 공정진단 및 평가)

  • Hwang, Tae-Mun;Nam, Sook-Hyun;Kim, Eun-Ju;Koo, Jae-Wuk;Han, Hongsik
    • Journal of Korean Society of Water Science and Technology
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    • v.26 no.5
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    • pp.65-74
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    • 2018
  • The water treatment simulator can be used for the design, diagnosis and optimization of water treatment process. It is a mathematical and statistical model based representation of physical and chemical process. Until now, commercial drinking water treatment simulator program has a disadvantage that numerical analysis algorithms are not included for ozone, ultraviolet AOP, nanofiltration and reverse osmosis membrane technology, which are recently introduced as advanced treatment technology in Korea. In this study, a new ozone CT simulation program was developed and evaluated for process design and diagnosis. The developed program can calculate ozone CT by various calculation methods such as CT10, CSTR, extended CSTR, Ceffluent T10 and extended integrated CT10. It is advantageous to evaluate the ozone CT value with the data measured in the field because the decomposition characteristics of ozone are very rapid according to the raw water properties. Therefore, it is possible to control the real-time disinfection potential monitoring and operation optimization by linking the developed program with the ozone decomposition rate measured in the field.

Application of Continuous Stirred Tank Reactor Model for Water Quality Control and Management in Wetland Treatment (습지의 수질관리를 위한 연속교반탱크반응기 모델의 적용)

  • Kim, Kyung-Sub;Ahn, Tae-Jin;Kim, Min-Su
    • Journal of Korea Water Resources Association
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    • v.41 no.3
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    • pp.243-249
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    • 2008
  • Continuous stirred tank reactor(CSTR) model which can be applied to control and management of the surface flow wetland is developed to simulate the water quality in this research. The model solution is obtained from the optimization model using the least-squares and 4th-order Runge-Kutta methods. The model is applied to simulate BOD and TSS in the wetland database of U.S. EPA, in which the hydraulic and water quality data are enough and the number of pond is just one for simple analysis of running results. The model is tested in two different cases, one constant volume case and another constant volume and flow rate case considering only reaction term, mass flux term and both reaction and mass flux terms respectively. It is found that the model simulates the real water quality very well with both reaction and mass flux terms rather than only reaction term and the settling velocity of TSS becomes $0.3{\sim}0.4\;m/d$. The model can be applied in wetlands treatment efficiently.

Optimizing Cooking Condition of Short Grain Rice Containing Sea-tangle Patch (다시마밥 제조조건의 최적화)

  • Shin, Eun-Soo;Lee, Jin-Hwa;Park, Kyong-Tae;Ryu, Hong-Soo;Jang, Dae-Heung
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.33 no.10
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    • pp.1726-1734
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    • 2004
  • Response surface methodology on sensory evaluation was used to optimize cooking condition of cooked short grain rice (CSR) and cooked short grain rice containing grainy sea-tangle patch (CSTR). Texture profile analysis and nutritional evaluation were also performed. For maximizing overall acceptability, it can be predicted sea-tangle patch 14%, added water 1.67 times of rice and sea-tangle amount and steeping time 47 min as optimum cooking conditions from sensory evaluation conducted by the forties panelist. Hardness of pressure cooked short grain rice containing grainy sea-tangle patch (CSTR) were lower than cooked short grain rice (CSR), but it showed similar as CSR in adhesiveness, chewiness and higher in springiness and cohesiveness. In addition CSTR was delayed retrogradation compared with CSR. The nutritional Quality of CSTR showed higher level in total dietary fiber, protein, ash than CSR, but lower in protein digestibility, C-PER, gelatinization degree compared with CSR.

Simple digital control of cell mass in biological CSTR (연속 교반 발효조에서 균체농도의 단순 디지탈 제어)

  • 이경범;황영보;이지태
    • 제어로봇시스템학회:학술대회논문집
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    • pp.647-651
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    • 1987
  • Yeast biomass in a biological continuous stirred tank reactor was controlled with an APPLE II microcomputer using adaptive control theory of bilinear systems. The controller used is as simple as a PID controller, but required less information. Cell concentration was well controlled by adjusting the inlet flow rate following the algorithm.

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Knowledge-Based Unmanned Automation and Control Systems for the Wastewater Treatment Processes (하.폐수 처리장의 원격 모니터링 및 지식 기반 무인 자동화 시스템)

  • Bae, Hyeon;Jung, Jae-Ryong;Seo, Hyun-Yong;Kim, Sung-Shin;Kim, Chang-Won
    • Journal of Korean Institute of Intelligent Systems
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    • v.11 no.9
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    • pp.844-848
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    • 2001
  • This paper introduces unmaned fully automation systems, which are applied for the CSTR(Continuously Stirred Tank Reactor) and SBR (Sequencing Batch Reactor) wastewater treatment system. The pilot plant is constructed in the country side which is little far from a main city. So networks and wireless modules are employed for the data transmission. The SBR plant has a local control and the remote monitoring system which is contained communication parts which consist of ADSL (Asymmetric Digital Subscriber Line) network and CDMA (Code Division Multiple Access) Wireless module. Remote control and monitoring systems are constructed at laboratory in a metropolis.

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