奥贝尔氧化沟技术在城镇污水处理中的应用

氧化沟技术是活性污泥工艺的一种变形,具有出水水质好,运行稳定可靠,管理简便的特点。近年来,该技术在污水处理中得到了广泛应用。本文结合应用实例,探讨了奥贝尔氧化沟技术在城镇污水处理中的应用,并对其运行情况进行了分析,取得了较好的出水结果,为今后城镇污水处理提供了参考。     

DPIV技术在模型黄河中的应用

首先根据模型黄河的特点,阐述了DPIV技术测量流速的基本原理。然后,讲解了作者利用DPIV技术,设计的模型黄河流速测量系统的组成。最后,针对在模型实验ee,具体的数据进行了分析,结果表明DPIV技术能快速有效地测量出表面流场的速度矢量分布,精度高、鲁棒性好,符合大型河工模型表面流场的速度测量要求。     

C-Orbal氧化沟在浙江富邦皮革废水改造工程中的应用

浙江富邦皮革有限公司调整了产品结构,废水结构也发生了变化,原废水处理工艺不能满足达标排放。针对这情况对原废水处理工艺进行了升级改造,在改造工程中应用了C-Orbal氧化沟。本文重点阐述C-Orbal氧化沟在该厂废水处理上的优势及运行经验,为皮革废水处理行业提供设计参数及运行经验。     

论活性污泥在改良型氧化沟工艺中的培养应用

本文以改良型氧化沟工艺为例,论述了该工艺的特点、运作流程以及活性污泥在氧化沟中的培养应用,为我国环保事业的发展提供一定的指导依据。     

相关原理在时频计量中的应用

本文论述在时间频率计量中的相关原理。基于自相关和互相关的理论,应用于频标比对器的检定和改进测量方法。     

carrousel2000氧化沟工艺技术应用分析

本文以银川市第三污水处理厂carrousel 2000氧化沟系统为实例,介绍了carrousel 2000氧化沟系统工艺技术特点。对于工艺运行管理的重点、难点、活性污泥培养以及生物脱氮除磷基本原理、DO、污泥龄、MLSS等参数控制进行了分析。     

Carrousel氧化沟在马拉博的安装调试与运行

对在非洲承建的城市污水处理厂施工环境、安装验收进行描述。重点介绍了国外污水处理厂安装与Carrousel氧化沟工艺调试难点及其措施。     

微弧氧化法及其在铁电薄膜制备中的应用

介绍了微弧氧化法的基本原理和工艺过程;综述了微弧氧化法制备铁电薄膜的发展历程及最新研究进展;讨论了目前微弧氧化制备铁电薄膜过程中存在的主要问题;提出了合理选择溶液体系和溶液浓度,研究工艺参数对薄膜表面形貌和铁电、介电性能的影响,提高薄膜表面质量是促进微弧氧化制备铁电薄膜技术发展的关键。     

深度氧化技术在污水处理中的应用研究

随着环境污染越来越严重,环境问题已经备受国际社会的关注．多种多样的污染物被排放到水域中,使其中的成分日益复杂。在大部分情况下．采用一般方法来除去这些污染物已经不能得到满意的结果。本文阐述了采用包括湿式、化学催化、超临界水、光化学以及电化学的几项深度氧化技术对生物难降解有机物进行处理,并且讨论了此几项处理技术的研究进展及发展趋势。     

催化氧化技术在烟草污水处理中的应用

在烟草企业之中,其烟草车间中污水主要是来源于锅炉房冲渣、冷冻站溢出水、除尘水、地面冲洗水以及其他方面的污水。从烟草企业污水的来源中可以发现,其所排放的污水的主要成分是有机物质和悬浮物,那么,对其的处理就不能按照一般的污水处理方法来进行。文章所要探讨的主旨就是对催化氧化技术在烟草污水处理中的应用和效果进行分析。首先概述了烟草车间污水的特点,然后详细介绍了当前催化氧化技术在烟草污水处理中的应用。     

PIV application in He II forced flow research

We report an experimental approach for applying the PIV technique to measurements in He II forced flow. The forced flow of He II is created in a 3.5 m long experimental channel within the Liquid Helium Forced Flow Visualization Facility (LHFVF). We demonstrate that micron size solid hydrogen isotope particles are the best choice for tracing He II forced flow. A novel particle seeding device has been developed to form and seed such solid hydrogen isotope particles directly within He II flow. Velocity field measurements of forced flow He II subjected to a constant locally applied heat flux are presented. Results are compared to analysis based on the two-fluid model.     

一种新的DPIV处理方法及其系统实现

本文首先简述数字粒子图像测流体速度场DPIV（Digital Particle Image Velocinmetry)的基本原理，提出一种新的DPIV快速算法－改进序贯似性检测算法，该算法直接在空域里处理DPIV图像，利用粒子图像特征，最大限度地去除冗余的处理，计算量比空域互相关算法提高两个数量级。就解决亚像素位移精度的问题提出了相位拟合法。最后，详细地分析了DPIV系统的一些关键性设计，并给出了实验结果。     

Cause and pre-alarm control of bulking and foaming by Microthrix parvicella--a case study in triple oxidation ditch at a wastewater treatment plant

The cause and control of foaming and bulking in triple oxidation ditch at a wastewater treatment plant (WWTP) were investigated. The results showed that the foaming and bulking was mainly caused by the excessive propagation of Microthrix parvicella, and mostly occurred in the cold winter and spring. Batch and continuous flow experiments indicated that biological techniques such as reducing sludge retention time (SRT) and increasing F/M ratio, chemical methods such as addition of chlorine (NaOCl), quaternary ammonium salt (QAS), or cationic polyacrylamide flocculants (PAM), polyaluminum salt (PAC) could decrease Sludge Volume Index (SVI) and control foaming and bulking at different levels. In practical application, the shorter SRT was effective to control foaming and bulking in initial stage, although it took longer time. Addition of 10gClkgMLSSd(-1) could gradually change the activated sludge with serious foaming and bulking to normal state within a week. Pre-alert control strategies should be established for the control of filamentous foaming and bulking.     

Synthesis of porous SiC and application in the CO oxidation reaction

Porous silicon carbide (SiC) was synthesized by carbothermal reduction method. In this method, the sucrose and the tetarethoxysilane (TEOS) were used as carbon resource and silicon resource. The surface area and pore volume of the obtained SiC was 157 m²/g and 0.46 cm³/g, respectively. Then the Pt/SiC was prepared by incipient impregnation method for the CO oxidation. The result shows that the catalyst exhibits relatively high catalyst activity, and makes it likely that SiC will become the subject of intense research as a potential new catalyst support material.     

Testing steady and transient velocity scalings in a silo

Gravity-driven discharge experiments were performed in a perspex 3D flat bottomed silo which was filled with a granular material, and had a variable discharge orifice size. The granular material used was amaranth seed with an average diameter of 1?mm. Particle Image Velocimetry (PIV) analysis was performed on a high-speed video recording of the discharge, and used to quantify the velocity field within the silo both at steady state and during the development of flow. We verified not only that the steady-state velocity of the granules in the silo scales with the flow rate, but, additionally, the transition to a steady-state regime is also rate-controlled by the volumetric discharge. We present evidence that, away from the discharge orifice, the flow behaves identically, regardless of the orifice diameter, in a scaled time. We discuss these results with reference to the physics and mathematical modelling of granular flows.     

光纤法-珀传感器并联复用的互相关解调

为了实现光纤法-珀传感器并联复用信号的高精度、绝对腔长解调,提出了一种改进的互相关解调法。该方法采用了特殊的相关因子,使得它与复用输出信号的互相关函数在传感器各腔长处为单峰从而有利于腔长比较接近的传感器的分辨;采用分段黄金搜索法减少了计算量,解调速度快。在宽带光源、光谱仪等组成的解调系统中对两只传感器复用进行了实验验证,结果表明:该系统可以实现光纤法-珀传感器并联复用信号的解调,能分辨的传感器之间的最小腔长差小于6ìm,腔长波动小于0.07ìm。     

壳聚糖-钴酞菁微球的制备及催化氧化异丙苯性能研究

以天然高分子壳聚糖和四磺酰氯酞菁钴金属配合物为原料,制备了壳聚糖-钴酞菁微球,通过IR、XRD、SEM等对其结构进行了表征.以异丙苯为反应底物,研究了壳聚糖-钴酞菁微球催化分子氧氧化性能,考察了反应时间、反应温度、催化刺用量、添加剂等对其催化氧化性能的影响.结果表明,在无任何助剂情况下,壳聚糖-钴酞菁微球具有良好的催化...     

Wet oxidation of lignin model compounds and acetic acid production

To investigate the wet oxidation (WO) pathways of acetic acid production from lignin, 2-methoxyphenol, 2,6-dimethoxyphenol, and phenol, as lignin model compounds were oxidized in a batch reactor at a temperature of 300°C, residence times of 10–60 seconds and oxygen supplies of 50–100%. Oxidation experiments using major intermediate products in WO of lignin model compounds, as reactants were also performed.Based on the intermediate products identified by GC/MS and HPLC, WO pathways of lignin model compounds are discussed. Acetic acid production by WO of lignin model compounds is also discussed. It was found that the yield of acetic acid for lignin model compounds was lower, at about 9%. The reason that lignin model compounds cannot produce a large amount of acetic acid may be contributed to the fact that the oxidation of phenols easily forms unsaturated dicarboxylic acids with 4 carbon atoms, which cannot produce a large amount of acetic acid. However, saturated dicarboxylic acids and glutaconic acid can produce a higher yield of acetic acid. Therefore, it is possible to increase the yield of acetic acid from lignin by controlling reaction pathways to increase the formation of saturated dicarboxylic acids and glutaconic acid.     

杨树叶风振实验研究

通过研究杨树叶及其模型在不同风速下的风振变形情况,发现基于风速和叶片长度的雷诺数是单一叶片振动变形的重要气动参数.实验主要采用摄像机记录树叶变形振动过程和粒子图像测速仪测量叶片尾流流场的方法进行.实验过程中,随着风速由小变大,真实树叶依次经过了静态变形,大幅低频振荡,叶片翻卷并重归静态,由静态变为大幅高频振动等不同状态.实验表明,随着风速的增大,人造树叶经历了与真实树叶相似的状态变化过程,但各个状态的临界雷诺数与真实树叶有所不同.     

Preparation of platinum inverse opals using self-assembled templates and their application in methanol oxidation

Synthetic opals were prepared on indium tin oxide (ITO) glass substrates from a highly monodisperse polystyrene dispersion. Platinum was then electrodeposited through the interstitial space of the opal matrix. The platinum inverse opal (Pt-IOp) was subsequently obtained by the removal of the polystyrene template, leaving a highly ordered three dimensional structure. Both the opal template and platinum (Pt) inverse opal were characterised by scanning electron microscopy, UV–visible spectroscopy and cyclic voltammetry. The results confirmed that the Pt inverse opal (Pt-IOp) has a microporous structure with high surface area and exhibits excellent electrochemical property. The electrocatalytic application of the resulting nanostructured Pt inverse opal electrodes for methanol oxidation was also investigated. The nanostructured Pt-IOp electrode showed a catalytic activity and highly stable electrocatalytic performance in methanol oxidation.