ADAPTIVE OPTIMIZATION OF CONTINUOUS BIOREACTOR USING NEURAL NETWORK MODEL

An adaptive optimization algorithm using backpropogation neural network model for dynamic identification is developed. The algorithm is applied to maximize the cellular productivity of a continuous culture of baker's yeast. The robustness of the algorithm is demonstrated in determining and maintaining the optimal dilution rate of the continuous bioreactor in presence of disturbances in environmental conditions and microbial culture characteristics. The simulation results show that a significant reduction in time required to reach optimal operating levels can be achieved using neural network model compared with the traditional dynamic linear input-output model. The extension of the algorithm for multivariable adaptive optimization of continuous bioreactor is briefly discussed.     

膜生物反应器膜污染数学模型研究进展

本文论述了膜生物反应器膜污染的影响因素、膜污染机理,阐述了膜污染数学模型的研究概况。最后,指出了活性污泥数学模型和人工神经网络在膜污染研究中的应用前景。     

喷雾干燥塔模糊控制模型及仿真

本文在研究喷雾干燥塔的传统控制的基础上,提出利用模糊控制方法并建立了模糊控制模型,仿真结果表明利用模糊控制方法进行喷雾干燥塔的控制是可行的。     

膜生物流化床脱氮特性研究

本文将膜分离技术和三相流化床相结合,重点研究结合后的新技术膜生物流化床在挂膜期间以及挂膜成功后氮的去除情况.试验结果表明,膜生物流化床稳定运行期间氨氮去除率能达到95%以上,总氮去除率在70%以上,并且反硝化作用还能进一步提高.     

IMMOBILIZED PLANT CELL CULTURE IN BIOREACTOR WITH NYLON CLOTH CASSETTE AND ITS FUZZY OPTIMAL DESIGN

A self-made bioreactor with a nylon cloth cassette immobilized C.roseus plant cells was used tostudy the indole alkaloid production in the“production phase”.The results show this bioreactor provided agood microenvironment for plant cells and was suitable for the culture of C.roseus cells to synthesize the indolealkaloids.A fuzzy multicritical optimal method was used to optimize the constructional and operating parametersof the immobilized plant cell reactor.The fuzzy optimization provide useful information for exploiting thelarge scale alkaloid production process.     

连续发酵生产酒精的陶瓷膜分离反应器的研制

一、前言为了提高酒精生产能力,人们开发出各种各样的新型反应器。其中,有膜分离技术与反应器相结合的产物——中空纤维膜反应器,因其具有较大的过滤面积,细胞浓度高,生产能力强,很有生命力。但其机械强度不好、细胞分布不均匀,经常发生泄漏等缺点。本文用高温烧结的陶瓷管代替中空纤维,研制成新型的陶瓷膜分离反应器。二、反应器的研制     

一体式膜生物反应器膜污染研究

以生活污水为处理对象,对一体式膜生物反应器中不可逆污染形成机理和可逆污染形成机理分别进行了研究;还进行了膜表面改性工作。不可逆污染速度初期快,然后逐渐减缓,第9d不可逆污染达到稳定。过滤初期,膜可逆污染速度较快,之后趋缓,第300min可逆污染达到稳定。膜不可逆污染发展缓慢,而膜可逆污染发展迅速。与原膜相比,膜改性后不可逆污染上升速度和污染程度显著减小。     

A FUZZY MATCH BASED EXPERT SYSTEM FOR SYNTHESIS OF SEPARATION PROCESSES

A predictive parallel search algorithm,the fuzzy match inference strategy,is implemented ina prototype expert system.Selection of separation technologies and sequencing of separators are beingapproached in an integrated manner.The fuzzy match mechanism results in a relatively smaller subsetof favored schemes,constituting a hyperstructure for further quantitative evaluation and combinationoptimization.An industrial application example of aromatics extraction separation is presented.     

膜生物反应器与粉末活性炭-膜生物反应器除污染特性对比研究

采用膜生物反应器(MBR)和粉末活性炭-膜生物反应器(PAC-MBR)两种工艺处理微污染原水,考察了两阶段进水情况下的除污染效能及初始有机物和氨氮质量浓度对各工艺除污染特性的影响。结果表明,进水有机物含量对MBR和PAC-MBR除污染的效果有较大的影响,当CODMn由(3.67±0.11)mg/L增加至(4.11±0.23)mg/L时,两种工艺对CODMn的去除率分别由(23.1±9.8)%和(37.6±5.5)%增加至(35.4±12.6)%和(43.1±17.0)%。两个阶段各工艺出水的NH3-N质量浓度均小于0.4 mg/L,且系统连续运行过程中出水的NO2--N质量浓度分别低至(7.5±5.8)μg/L和(6.1±3.6)μg/L,显著低于原水中的平均值(76.9±7.6)μg/L。同时发现PAC-MBR工艺中PAC延长了微生物与有机物的接触时间,并为微生物生长提供了载体,可有效提高细菌的总耗氧速率(SOUR),并使生物处理系统中的有机物浓度的临界值降低,从而有效提高整个生物处理系统中有机物和氨氮的去除率。     

模糊辨识法对隧道窑工况识别的研究

在模糊识别理论的基础上提出了一种适宜于复杂系统工况识别的单模糊模式直接距离法。用此方法对景德镇光明瓷厂３号隧道窑实际工况数据进行了辩识,取得了较为满意的结果。在辩识过程中对正常与异常工况样本的类聚性进行了分析,并讨论了所选取的各参量对类聚性的影响。     

A MATHEMATICAL ANALYSIS OF A MEMBRANE BIOREACTOR CONTAINING A SLUDGE DISINTEGRATION SYSTEM

The activated sludge process is widely used to treat domestic and industrial wastewater. A significant drawback of this process is the production of “sludge”, the disposal of which can comprise a significant proportion of the total operating costs of a wastewater treatment plant. We analyze the steady-state operation of a membrane bioreactor system (MBR) incorporating a sludge disintegration unit (SDU) to reduce sludge production. We provide a qualitative understanding of the model by finding analytically the steady-state solutions of the model and determining its stability as a function of the residence time. In practice a target value of the mixed liquor suspended solids (MLSS) content within the membrane reactor is specified. Applying the mathematical technique of singularity theory we show that if the sludge disintegration factor is sufficiently high then the MLSS content is guaranteed to be below the target value. This model prediction, of key interest from a practical perspective, was not identified in the original investigation of this model, which relied upon numerical integration of the governing equations.     

一体式平板膜-生物反应器处理水中污染物研究

研究了一体式平板膜-生物反应器对水中污染物的去除效果。试验结果表明：系统对COD、NH3-N、TN、阴离子表面活性剂（LAS）均有很好的处理效果。其中生物降解起主要去除作用,平板膜对污染物的进一步去除、稳定出水水质起到了重要的作用。     

膜-序批式生物反应器膜过滤特性研究

采用中空纤维膜-序批式生物反应器(HF-MSBR)和双功能膜-序批式生物反应器(DF-MSBR)处理实际洗浴污水,在不排泥条件下考察了系统对污染物的去除效果及膜的过滤特性。结果表明,两系统污染物去除效果良好,COD、浊度等平均去除率分别达到95.2%和88.4%、99.6%和96.9%;DF-MSBR系统中聚乙烯膜组件对COD的强化去除作用不明显,但对浊度的强化去除作用显著,通过膜曝气可以使膜通量具有一定程度的恢复,但膜过滤性能仍不稳定,膜污染发展速度较快,过滤周期较短;HF-MSBR系统出水COD优于DF-MSBR,出水浊度小于1NTU,在运行期间膜过滤阻力上升缓慢,平均上升速率远远小于DF-MSBR系统。     

微网反应器处理低含量生活污水膜污染研究

依托厌氧膜-生物反应器开发了1种以涤纶网为过滤材料的厌氧微网反应器,考察了不同规格的微网对低含量生活污水的处理效果,并用三维荧光光谱,环境扫描电镜和能谱分析方法考察了微网膜表面的污染状况.结果表明,在20L·m-2·h-1恒通量连续进出水的模式下,稳定运行55～65 d;COD去除效果与变化均与微网孔径密切相关,孔径越...     

A BIOREACTOR FOR TWO-STAGE MULTIPLE SHOOT CULTURE OF CATHARANTHUS ROSEUS

1 INTRODUCTIONThe production of commercially important indole alkaloid from tissue culture of C.roseus hasbeen a major objective of research carried out worldwide[1].Of primary importance has beenthe production of catharanthine and vindoline which can be used as precursor for thesynthesis of commercially important antineoplastic agents,vinblastine and vincristine.     

膜生物反应器用于医院废水处理

采用以膜生物反应器为主体的工艺处理医院废水,处理能力1000m^3／d,整套装置运行稳定,出水水质低于《污水排放综合标准》（GB8978-1996）二级标准,部分水质指标低于一级标准。     

膜生物反应器处理苯酚丙酮及双酚A装置生产废水工程设计

在水质特性分析的基础上,选用"气浮-水解酸化-一级好氧处理-二级MBR"工艺进行了苯酚丙酮及双酚A装置生产废水工程设计。工程运行实践表明,该工艺处理苯酚丙酮及双酚A装置生产废水是可行的,出水可实现达标排放,膜组件清洗周期较长,运行费用较低。对于MBR系统,需从系统的角度综合考虑预处理和MBR,进行整体优化设计。针对此类废水,膜生物反应器前端需采用均质调节和气浮等预处理工艺确保MBR系统正常运行。     

膜生物反应技术处理造纸废水试验

本文初步研究了膜生物反应器在难降解的造纸废水中的处理效果,并与传统的活性污泥法和生物接触氧化法进行了对比,本文还进行了膜生物反应器曝气池中污泥浓度与CODCr去除率关系的研究。试验结果表明：在同样水质的条件下,膜生物反应器的处理效果明显好于普通的生物法。污泥浓度达6000mg／L以上时,膜生物反应器出水CODCr可降至100mg／L以下。而普通的生物法却无法达到这一数值。     

THEORETICAL ANALYSIS OF FREQUENCY RESPONSE IN CONTINUOUS BIOREACTOR

There are several well-known growth models (Monod, Moser, Tessier and Contois) often viewed as no difference except data fitting. With frequency response analysis, it is shown that periodic operation is suitable to differentiate these models. Estimation of system parameters by this method is also discussed. Additionally, the vertical distance between the intersection of two asymptotes and amplitude ratio curve in Bode diagram is found to be always log (√2) for a constant yield factor case.     

基于模糊综合评判理论的陶瓷窑炉先进性评价模型

运用二级模糊综合评判评价陶瓷窑炉先进性的方法和模型，为用量化的办法客观、公正、科学、规范地做好陶瓷窑炉先进性评价工作提供了一种可供借鉴的模式．并通过实例验算，汪明结果可靠，操作简便，有广泛的应用前景。