浸没式膜-生物反应器中污泥浓度对错流速度及传氧速率的影响

研究了浸没式膜-生物反应器中污泥浓度与膜面错流速度以及传氧速率之间的关系。结果表明,污泥浓度的提高使传氧速率系数下降,当污泥浓度从4.5g/L变化至21.5g/L,传氧速率系数从0.565降低至0.155。根据气液反应器理论进行传质分析表明,传氧速率系数的降低主要是由于污泥浓度增大引起了混合液粘度增大所致。同时污泥浓度的上升会导致膜面错流速度的降低,不利于控制膜污染。     

一体式中空纤维膜生物反应器处理印染废水的研究

采用规模为500L／d的一体式中空纤维膜生物反应器对常州某印染厂的印染废水处理进行了研究。该装置在现场连续运行了80d。实验结果表明：当进水COD为600～1200mg/L时，出水COD为52～97mg/L，COD去除率为90％。膜的截留作用占总去除率的10％。20％，NH3-N去除率为90％～95％，色度去除率为60％～75％。采用膜生物反应器（MBR）工艺处理印染废水技术可行、操作简单、易于管理，可为工业规模应用提供技术参考。     

基于MBR的主方向关系一致性检验

定性的空间推理在地理信息系统、人工智能、数据库及多媒体等领域中的应用越来越引起人们的注意.空间推理的基础理论以及相应算法也在不断地创新和发展.方向关系推理是空间推理研究领域的重要分支,利用区间代数及矩形代数理论,以物体的极小边界盒(minimum bounding rectangle,简称MBR)为模型,提出了一种基于MBR的主方向关系与矩形代数关系相结合的推理方法.利用该方法,可以将矩形代数良好的计算性质应用于空间方向关系推理中,实现了矩形代数与基于MBR主方向关系的相互转换方法、主方向关系合成及求反方法、主方向关系中凸(convex)关系判定方法及方向关系一致性检验算法.     

计算机硬盘故障修复技术探讨

计算机硬盘故障是计算机的一个重要的安全问题。本文准备就计算机硬盘故障的一般处理方法作一个探讨．对故障的现象进行分析，并且提出出现故障的原因和解决方法，希望能对出现硬盘故障的用户有所裨益。     

中空纤维膜分离技术在水资源化中应用

介绍了中空纤维膜连续膜过滤(CMF)、膜生物反应器(MBR)和双向流膜过滤(TWF)的工艺原理、技术特点和在水处理中的应用．     

杂环类农药废水的深度处理工艺

杂环类农药废水因其有机物含量高、毒性大而成为水处理的难题。本文介绍了膜生物反应器／高级氧化／超滤组合工艺作为杂环类农药废水深度处理方法，并对该工艺的构筑物参数、经济成本及运行结果进行分析。实验结果表明该法对杂环类农药废水有较好的处理效果，并具有运行成本低、占地面积小的特点。     

MBR工艺应用于城市污水处理的技术风险

对MBR工艺应用于城市污水处理中的技术风险进行了系统的分析,预处理的风险、处理能力降低的风险以及自动控制系统的风险是MBR工艺在应用时的主要技术风险。预处理应得到充分的重视,有效的预处理对于保持工艺性能非常关键。为了应对处理能力的降低,合理地设置调节池或膜组件对于保持处理能力非常重要,大型MBR污水处理厂还应准备一套传统工艺以应对峰值流量。小型MBR污水处理厂可以采用一套PLC控制系统,大型MBR污水处理厂应采用两套PLC控制系统,并且采用环状结构连通。     

Fouling Control by Reduction of Submicron Particles in a BF‐MBR with an Integrated Flocculation Zone in the Membrane Reactor

Abstract

Submicron particles represent one of the major foulants in the biofilm membrane reactor BF‐MBR. Reduction of the amount of submicron particles (colloids) adjacent to the membrane is one measure in order to provide better fouling control in BF‐MBR systems. A submerged hollow fiber (Zenon Zeeweed) membrane reactor was redesigned by introducing a flocculation zone below the aeration device of the membrane module. This resulted in reduction of submicron particles around the membrane from 8.2% to 6.9%, expressed in differential number percentage. The size of the most abundant particle fraction consequently increased from 0.70 to 0.84 µm. Furthermore, the modified membrane reactor design provided longer operational cycles, >40% reduction of suspended solids around the membrane, and improved retentate/concentrate characteristics, i.e., dewaterability (CST), settleability (SVI/SSV) and filterability (TTF).     

一体化MBR工艺污水厂控制系统的设计

本文结合了MBR污水处理工艺的特点,重点论述了污水厂自控系统的设计。基于新型的控制网路结构,在确保工控信号传输质量的前提下,实现了工业控制网络、工业视频监控网络及工厂信息综合管理网络的"三网合一",为污水厂控制系统的设计与建设提出了新的思路。     

In-situ utilization of generated electricity in an electrochemical membrane bioreactor to mitigate membrane fouling

How to mitigate membrane fouling remains a critical challenge for widespread application of membrane bioreactors. Herein, an antifouling electrochemical membrane bioreactor (EMBR) was developed based on in-situ utilization of the generated electricity for fouling control. In this system, a maximum power density of 1.43 W/m³ and a current density of 18.49 A/m³ were obtained. The results demonstrate that the formed electric field reduced the deposition of sludge on membrane surface by enhancing the electrostatic repulsive force between them. The produced H₂O₂ at the cathode also contributed to the fouling mitigation by in-situ removing the membrane foulants. In addition, 93.7% chemical oxygen demand (COD) removal and 96.5% ₄NH⁺-N${{\text{NH}}_4}^{+}-\text{N}$ removal in average as well as a low effluent turbidity of below 2 NTU were achieved, indicating a good wastewater treatment performance of the EMBR. This work provides a proof-of-concept study of an antifouling MBR with high wastewater treatment efficiency and electricity recovery, and implies that electrochemical control might provide another promising avenue to in-situ suppress the membrane fouling in MBRs.