基于BioWin软件的ICEAS工艺模拟与升级改造探讨

利用BioWin软件建立了北京某污水处理厂ICEAS工艺的模型,利用污水处理厂实际运行监测数据和原污水中各有机组分的检测结果对模型进行了动态模拟和校正,确定了模型参数,动态模拟运行结果与实际出水检测结果十分接近,所建立的模型能够较好地反应ICEAS工艺的运行状况。针对目前该工艺出水中氮、磷不达标问题,从调整运行参数、改变工艺流程两个方面对现有工艺提出了升级改造方案。利用BioWin软件对改造方案进行了模拟优化,经过模拟预测对比最终确定了最优改造方案。     

膜生物反应器处理住宅小区生活污水

膜生物反应器(MBR)是近年来新发展起来的高效废水处理工艺.通过对生活污水进行MBR工艺处理的研究, 证明该工艺处理生活污水可得到直接回用的优良水质.对3种类型MBR工艺的运行费用进行了分析对比,提出宜采用一体式MBR工艺处理生活污水.分析了MBR工艺处理生活污水的生物动力学参数和膜分离参数,对膜通量与工作压力、冲击负荷、曝气强度等运行条件之间的关系进行论述.指出采用MBR工艺处理住宅小区生活污水时应注意尾气处理、噪音控制,同时应加强消毒管理,提出了具体的解决方法.     

基于模型的MBR工艺模拟及优化

利用活性污泥工艺商业软件,构建了某城市污水处理厂的MBR水处理工艺模型,对模型参数进行了率定。而后基于构建的模型,对该城市污水处理厂的运行现状进行了深入的剖析,并推荐出一套适宜的优化改造工艺。与实际改造后的运行效果对比,模型模拟结果与现场实测数据实现了良好的吻合。阐述的方法及流程具有通用性,可以为其他类似污水处理厂的工艺模拟及优化提供参考。     

无锡梅村污水处理厂MBR工艺多年运行效果分析

回顾了无锡梅村污水处理厂二期工程MBR的系统设计,对收集到的运行数据进行分析,通过剖析关键的性能指示参数,包括出水水质、跨膜压差、膜的透水率等,分析了7年多来MBR工艺的运行效果和膜性能。为MBR工艺污水处理厂运行管理提供数据支撑。     

计算机模拟在污水处理厂改建设计中的应用

根据国际水质协会的活性污泥1号模型,结合Takacs的二沉池模型,应用Delphi编译软件,在Windows平台上自行开发了污水处理模拟系统;通过对上海市某采用A/O工艺的污水处理厂的模拟,确定了模型的参数并对模型进行了校正。根据模拟结果对污水处理工艺提出改建的设计方案:没有内回流,A/O两段等体积的运行方式。     

城市污水处理CASS工艺模拟与优化

以中山市大涌污水处理厂的CASS工艺为例,介绍了如何利用工艺模拟工具解决实际工程问题的方法。利用BioWin软件所构建的大涌污水处理厂模型,通过对该厂历史数据和补充采样数据进行模拟和校正。经校正后的模型用于现有污水处理厂在不同运行方案下的情景分析和优化,同时,对模型在节能降耗方面的应用也进行了探讨。     

MBR的脱氮除磷工艺研究

采用厌氧/缺氧池/好氧MBR工艺处理模拟的城市生活污水,就系统主要的运行参数对氮磷去除的影响进行了研究.结果表明:TN、TP、NH3-N去除率分别达到80%、90%、95%以上,出水各项指标完全满足城市杂用水水质标准的要求.     

BNR—MBR组合工艺处理生活污水研究进展

目前城市污水处理工艺多采用生物营养盐去除工艺(BNR),引入膜生物反应器(MBR)组成BNR—MBR组合工艺,可以提高出水水质,实现水资源的回用。与传统的BNR工艺相比,组合工艺的某些运行条件和工艺参数发生了改变。概述了BNR—MBR工艺应用在生活污水处理中的工艺特征,分析和探讨了组合工艺对氮、磷的去除特性以及膜污染控制。     

基于BioWin~?的城市污水处理厂全流程处理工艺模拟与优化

BioWin~?是一款能够模拟污水处理厂处理工艺全流程的软件。采用BioWin工艺模拟软件对苏州某城市污水处理厂处理工艺全流程进行了建模、校正和验证,并利用建立的模型对该污水处理厂的工艺控制参数提出优化建议,以期辅助指导该污水处理厂优化运行,降低能耗、药耗及降低运行成本。     

北京市北小河污水处理厂MBR系统运行分析

北京市北小河污水处理厂是国内较早采用MBR工艺的大型污水处理工程,已稳定运行了3年多。对污水处理厂MBR工艺实际运行数据进行分析,并介绍了运行过程中出现的膜丝缠绕、生物池污泥浓度不均衡、膜清洗药剂消耗等问题及相应的改造措施,在此基础上对MBR工艺的设计提出建议。     

MBR pilot plant for textile wastewater treatment and reuse.

An experimental study was carried out in order to evaluate the possibility of upgrading the conventional activated sludge WWTP of Seano (Prato, Italy) which treats municipal and textile wastewaters, by using membrane bioreactor (MBR) technology. The MBR pilot plant, set up within Seano WWTP, was fed with mixed municipal-industrial wastewaters during the first experimental period and with pure industrial wastewaters during the second. Performances and operation of the MBR were evaluated in terms of permeate characteristics and variability (COD, colour, surfactants, total N and P) and other operational parameters (sludge growth and observed yield). According to the experimental results the MBR permeate quality was always superior to the Seano WWTP one and it was suitable for industrial reuse in the textile district of the Prato area. Respirometric tests provided a modified IWA ASM1 model which fits very well the experimental data and can be used for the design and the monitoring of a full-scale MBR pilot plant.     

Influence of suspension viscosity and colloidal particles on permeability of membrane used in membrane bioreactor (MBR).

In this study, pilot scale experiments were carried out to examine membrane fouling occurring in membrane bioreactors (MBR) with or without pre-treatment (coagulation/sedimentation). Especially, the influence of suspension viscosity and dissolved organic matter (DOM) on membrane fouling was investigated. The pre-coagulation/sedimentation process improved the performance of a MBR in terms of membrane permeability by controlling irreversible fouling and formation of thick cake layer. The upper limit of MLSS concentration for an efficient operation in MBR without pre-treatment was suggested to be around 10 g/L based on the measurement of suspension viscosity. In this study, it was difficult to directly relate membrane fouling to DOM detected in the membrane chamber. A series of laboratory scale dead-end filtration experiments was carried out to investigate which fractions in biomass suspension would be the most influential in the deterioration of membrane permeability. Based on the dead-end tests, it was shown that the deterioration of membrane permeability was mainly caused by the colloidal particle fraction in the biomass suspension.     

Enhanced nutrient removal MBR system with chemical addition for low effluent TP

A pilot study was conducted to test an membrane bioreactor (MBR) process for combined biological and chemical P removal to achieve a very low effluent total phosphorus (TP) concentration of 0.025 mg P/L. With the data from the pilot test, a simulation study was performed to demonstrate that: (1) the pilot system behaviour (effluent quality, MLSS, etc.) can be modelled accurately with an activated sludge model combined with a chemical precipitation model; and (2) with the calibrated model, simulation scenarios can be performed to further understand the pilot MBR process, and provide information for optimizing design and operation when applied at full-scale. Results from the pilot test indicated that the system could achieve very low effluent TP concentration through biological P removal with a limited chemical addition, and chemical addition to remove P to very low level did not affect other biological processes, i.e., organic and nitrogen removal. Simulation studies indicate that the process behaviour can be modelled accurately with an activated sludge model combined with a chemical precipitation model, and the calibrated model can be used to provide information to optimize system design and operation, e.g., chemical addition control under dynamic loading conditions is important for maintaining biological P removal.     

MBR与接触氧化工艺用于中水处理的比较

某高校中水处理工程采用MBR代替接触氧化工艺进行改造,在实际运行情况的基础上,对MBR和接触氧化工艺在工艺流程、处理效果、投资成本和运行维护管理等方面进行比较,结果表明,MBR在各方面均体现出较强的优势,为MBR的实际应用和发展提供参考。     

Membrane bioreactor aeration: investigation of the velocity flow pattern.

Results of investigations concerning membrane bioreactor aeration are presented which were carried out at the Institute of Environmental Engineering of RWTH Aachen University (ISA) in cooperation with the Department of Chemical Engineering of the Technische Universit?t Berlin. In the field of industrial and municipal wastewater treatment the use of membrane bioreactors (MBR) is of increasing interest especially due to the high requirements on effluent quality nowadays. The design of aeration systems is a very important aspect of MBR development because it influences both cost of operation and filtration flux. The ISA has carried out tests concerning the velocity flow pattern in flat sheet membrane modules (developed by the A3 Water Solutions GmbH) to identify the effects of different aeration systems, aeration intensities and module constructions. The Department of Chemical Engineering is currently using the results obtained from the ADV to calibrate a numerical model which simulates two phase water and gas flow within an aerated membrane module. Optical investigations concerning the bubble distribution give a better understanding of the flow conditions in MBR. Developing a numerical tool for membrane module optimization concerning the hydrodynamics is the aim of the investigation of membrane bioreactor aeration.     

WaSSI-C模型GIS可视化模拟系统的设计、实现与验证

为实现WaSSI-C(Water Supply Stress Index-C)模型地理信息系统(GIS)可视化模拟系统,为区域水碳资源分析和模拟决策提供模型工具,在解析WaSSI-C模型理论框架和运行机理的基础上,对模型计算过程进行模块化分解和结构化设计;采用C/S模式构建软件体系架构,基于时空数据模型设计E-R模型图,并应用Geodatabase空间数据库与SQLite关系型数据库联合管理模型参数和时空数据;在.Net开发环境下,基于ArcGIS Engine二次开发组件,使用C#语言进行混合编程,实现WaSSI-C模型GIS可视化模拟系统的功能,进而以焉耆盆地为试验对象进行应用验证。结果表明:系统同时支持文本和空间数据格式输入,能够在GIS可视化环境下自动化输出研究区月尺度蒸散、径流和总生态系统生产力等水碳耦合过程变量的模拟地图,系统模拟结果率定期R²和NS均值分别为0.83和0.81,验证期两指标均值分别为0.8和0.76,总体上显示出良好的模拟效果。系统具有简单易用、运算效率高、普适性强等特点,可为相关领域研究提供有力工具支撑,也可为生态学、水文学等专业领域模型可视化研究提供借鉴思路。     

Package plant of extended aeration membrane bioreactors: a study on aeration intensity and biofouling control.

Biofouling control is important for effective process of membrane bioreactor (MBR). In this study, phenomena of biofouling for immersed type extended aeration MBR with two different anti-fouling aeration intensities were studied through a laboratory set up. The objectives of this study were (a) to observe biofouling phenomena of MBR that operates under different anti-fouling bubbling intensity, and simultaneously monitors performance of the MBR in organic carbon and nutrients removal; (b) to compare effectiveness of detergent and detergent-enzyme cleaning solutions in recovering biofouled membranes that operated in the extended aeration MBR. For MBR, which operated under continuous anti-fouling aeration, deposition and accumulation of suspended biomass on membrane surface were prohibited. However, flux loss was inescapable that biofilm layer was the main problem. Membrane cleaning was successfully carried out with detergent-enzyme mixture solutions and its effectiveness was compared with result from cleaning with just detergent solution.     

水力浮动式升船机输水系统仿真分析

景洪水电站的水力浮动式升船机是通过改变设置在竖井中的平衡重浮筒与承船厢重量之差来驱动整个系统运行。本文根据设计方案,分别建立输水系统能量方程、平衡重浮筒——承船厢系统的运动方程和竖井充泄水的连续方程,并构成了水力浮动式升船机整个系统的仿真数学模型。通过计算,得到了输水系统水力特性及承船厢运行特性参数的变化过程。结果表明,承船厢运行速度平稳,最大加速度为 0.009m/s2,不超过加速度设计要求限值,说明水力浮动式升船机输水系统能够保证承船厢的稳定运行,竖井、平衡重浮筒及承船厢的布置型式是合理的。     

Calibrating a side-stream membrane bioreactor using Activated Sludge Model No. 1.

Membrane bioreactors (MBRs) are attracting global interest but the mathematical modeling of the biological performance of MBRs remains very limited. This study focuses on the modeling of a side-stream MBR system using the Activated Sludge Model No. 1 (ASM1), and compares the results with the modeling of traditional activated sludge processes. ASM1 parameters relevant for the long-term biological behaviour in MBR systems were calibrated (i.e. Y(H) = 0.72 gCOD/gCOD, Y(A) = 0.25 gCOD/gN, b(H) = 0.25 d(-1), b(A) = 0.080 d(-1) and f(p) = 0.06), and generally agreed with the parameters in traditional activated sludge processes, with the exception that a higher autotrophic biomass decay rate was observed in the MBR. Influent wastewater characterization was proven to be a critical step in model calibration, and special care should be taken in characterizing the inert particulate COD (X(I)) concentration in the MBR influent. It appeared that the chemical-biological method was superior to the physical-chemical method. A sensitivity analysis for steady-state operation and DO dynamics suggested that the biological performance of the MBR system (the sludge concentration, effluent quality and the DO dynamics) are very sensitive to the parameters (i.e. Y(H), Y(A), b(H), b(A) micro(maxH) and micro(maxA), and influent wastewater components (X(I), S(s), X(s) and S(NH)).     

考虑Markov岩性预测的引水隧洞施工全过程仿真研究

针对引水隧洞的施工,利用Markov岩性预测模型对地质岩性进行预测,得到隧洞沿程的岩性概率分布。在所得概率分布的基础上,随机确定隧洞岩性情况,并进行相应仿真参数的选择,进行考虑岩性不确定性的引水隧洞施工全过程仿真。结果表明:在仿真参数选取时考虑地质条件的影响能够更全面地反映施工过程的不确定性,有助于更好地分析隧洞的施工风险。