关于用自制零部件修复进口污水处理设备的办法

深圳南山污水处理厂进口的格栅机被污水冲坏,格栅条后面起固定作用的槽钢发生断裂,致使格栅机隔不住垃圾等杂物,若不及时修复,较大的垃圾、木块等杂物进入蓄污池中,会造成较大的杂物被卡在飞力泵中,甚至会损坏飞力泵,影响污水的提升和处理,使污水处理厂被迫停产,造成污水外溢,严重影响市区环境和近海生态环境。从现场断裂的槽钢中,发现进口原装的槽钢是特殊形状的,截面如图１所示,即高度ｈ与腿宽ｂ相同,均为１００ｍｍ,长度 Ｌ＝２２３０ｍｍ,ｄ＝６ｍｍ,经化验可知,材料成份接近Ａ３钢。目前在国内还没有相同尺寸的槽钢…     

利用水份测定仪快速测定曝气池污泥浓度

文章探讨了利用水份测定仪快速测定污水处理厂曝气池污泥浓度的试验方法，并与电热恒温干燥重量法进行了对比实验。实验结果，用水份测定仪测定污泥浓度，不但简便、快速，而且重复性好，结果准确度能与电热恒温干燥重量法相媲美，适应于污水处理厂中污泥浓度的检测。     

海绵城市建设中老旧小区雨污分流改造设计探讨

现如今我国步入了新时代,为推动社会各方面快速发展,各地区不断提升基础设施建设力度,但城市内经常会出现内涝问题,促使城市排水系统建设迫在眉睫,尤其是一些老旧小区,依旧采用传统雨水污水排放系统。本文建立在海绵城市建设理念上,对老旧小区雨污分流改造设计进行探讨,主要研究雨水污水分流系统改造的重要性和设计要点以及雨污排水系统现状,并提供了改造对策。     

格栅除污机控制方式的改进

本文对栅耙式格栅除污机和适合于间歇运行的格栅除污机的常规控制方法做了改进,从而大大降低了自控设备维护量,从安装、调试、测量精度等方面降低了对自控仪表的要求.使污水处理厂在进水高峰、低谷和季节性的污水中固体物明显增多等情况下,均可较好地发挥格栅除污机的拦污效果,使设备始终保持一个稳定的除污效率.     

广州大学城污水管网改造工程设计

广州大学城污水管网自2004年建成使用至今,现今污水管网存在雨污错接、漏接甚至堵塞等问题,通过对现有污水管网进行检测分析其管网不畅原因,结合现状,提出管网改造实施方案,并给出今后城市特定区域排水管网建设、维护和改造的合理化建议。     

污（废）水处理地中风机房的噪声控制

污（废）水处理地中风机房的噪声控制辽宁省轻工设计院班秀英一、风机机组工业污（废）水好氧处理过程中，对污水进行充氧曝气，势必采用风机机组将空气中的氧代人水中。在风机工作过程中，风机、机组就是主要噪声源。对新建工程风机机组的选择除满足污（废）水处理工艺外...     

太原市污灌土壤重金属含量调查与评价

通过对太原市污灌区土壤重金属污染现状进行调查表明:调查区域土壤中重金属的含量差异不大;除晋源区姚村镇田村属于尚清洁级外,其余都属于清洁安全级;但是除Cd、As外,其他各元素在土壤中富集度较高,对该区的污水灌溉应加以控制.     

钢中氧化铝夹杂物对刀具磨损的影响

本文论述了钢材中氧化铝夹杂物对刀具磨损的影响;介绍了为从基理上阐明氧化铝夹杂物的作用而进行的典型实验;探讨了为减少氧化铝夹杂物的危害而用实验炉控制夹杂物形态的效果。     

污水收集输送一体化预制泵站技术要求及试验

污水收集输送一体化预制泵站是一种新型地埋式污水自动化收集与提升系统,泵站内部集成了拦污碎污装置、潜水污水泵、自动控制装置、排污管道、阀门以及检修空间等,整体在工厂制造安装完毕,到现场吊装到地坑中接好外部管路即可投入使用,具有安装简单快捷、省土建费用、无人值守、自动运行、远程控制以及不占地面空间等优点。简要地介绍了污水收集输送一体化预制泵站的技术要求及试验。     

基于新型改性纤维填料的油水分离过程研究

针对含油污水设计制作了一套内置新型改性纤维填料的立式油水分离器;考察了该油水分离器进口流速和污水含油浓度对处理后出水油含量和除油效率的影响,并分析了污水含油浓度对油滴脱除粒径的影响.研究结果表明,进口流速小于2L/min时,出水含油浓度随之缓慢增加,且除油效率均在90%以上;当进口流量设定在1.54L/min,进口浓度在从25～1200mg/L内变化时,经过两级处理后油含量最低可以达到4.6mg/L.纤维填料对油滴粒径大于10μm的脱除效率达到了96%以上.     

基于磁电阻率法和频率域电磁法的地下水污染动态监测仿真

本文对磁电阻率法与频率域电磁法在地下水污染监测中的应用进行了理论研究.以污染物位于地表的均匀介质模型为例,根据污染物扩散的水文地质动态仿真结果,计算出与各监测时刻对应的地下水污染地电模型.通过各地电模型的二维磁电阻率法正演模拟结果以及一维频率域电磁法的反演结果,验证了这两种地球物理方法在地下水污染物运移监测中的有效性.     

固相萃取工作站-气相色谱法测定污水处理厂进出水中有机污染物

本文采用全自动固相萃取仪富集城市污水处理厂总进水和二级出水样品中的酚、有机磷、多环芳烃和酯类等20种有机污染物质,萃取柱为反相柱ENVI-18,经浓缩仪浓缩后,使用气相色谱仪进行测定。同时进行了空白加标回收率测定,效果较好。使用本方法进行了两个城市污水处理厂的总进水和二级出水中有机物的测定。结果表明,污水处理厂的二级处理对上述有机污染物中50%以上的去除率可达到80%以上。     

Simple formula for the non-uniform contaminant deposition on a cylindrical human body surrounded by porous clothing

Characteristics of contaminant deposition on a human body underneath porous clothing were studied using numerical analyses of air flow and convective diffusion. A recirculation zone was formed in the middle of the air channel when the penetration Reynolds number exceeded a critical value; in this condition the deposition distribution showed a second peak. In the absence of recirculation, deposition decreased monotonically from the front stagnation point to ~0 at the rear stagnation point. A universal function was derived to quantify the spatial distribution of contaminant deposition and of the concentration boundary layer thickness.     

An Experimental Study on the Concentration and Shape of Dents Caused by Spherical Metallic Particles in EHL Contacts©

An experimental study of metallic contaminant effects on surface indentation in EHL contacts is presented. Particles are initially spherical and are composed of M50 high-carbon steel powder. Their diameter ranges from 32 to 40 μm. An original lubrication system with a controlled level of contamination was built. The contaminant distribution and concentration are measured on-line by an automatic particle counter. Tests are conducted on a two-disk machine with different operating conditions. Particles may travel through the EHL contact only one time, the lubricant flow being used only once. The oil is a synthetic one qualified under the MIL-L-23699 specification. An optical profilometer is used to describe the indent topography and a CCD video camera to count the number of dents.

The test bench is described and the experimental procedure is presented. Specific tests were performed to quality the contamination bench. The combined effects of particles concentration and test duration on dent distribution were studied. Some results on the shape and concentration of indents versus operating conditions are presented. It is shown that over the range of test conditions considered, the number of indents on the raceways can be estimated from the particle concentration in the oil bulk. This leads to the conclusion that the particle entry ratio is close to one, i.e., the concentration of particles inside the EHL contact is close to those in the bulk.     

Libricated three-body abrasive wear-contaminant condition versus bounding surface material hardness

The response of wear rate and clinical failure load to contamination and material hardness has been determined for AISI 52100 steel. A ball-on-roller contact geometry was used, in which the stationary rollers had three grades of hardness: 42, 56, and 63 HRC. The test contaminant, aluminium oxide (Al₂O₃) powder in <10, 10–20, and 20–30 μm sizes, was injected into an SAE 10 base oil at 10, 100, and 200 mg/litre concentration levels. Machine load and sliding speed were varied in the range 15 to 210 kg and 0.26 to 1.05 m/s, respectively. A qualitative assessment of worn surfaces was also undertaken. For the largest contaminant size and concentration, the load-carrying capacity to failure was about half that for the uncontaminated condition of operation.     

含污染物油润滑条件下的磨粒磨损研究

概述了含污染物油润滑条件下的磨损试验方法，分析了磨粒尺寸、磨粒含量；材料硬度和材料表面粗糙度等试验参数对含污染物油润滑条件下材料的磨损性能的影响，结果表明其磨损机理主要是点蚀、犁削和熔着磨损，并提出了解决措施。     

基于声发射技术的绝缘子在线监测方法的研究

通过对绝缘子现行的污秽监测方法的研究分析,提出了基于声发射技术的绝缘子污秽放电在线监测方法,对电晕放电和污秽放电声发射信号进行了实验研究,并对两者放电声发射在波形相位与强度上的差别进行了分析比较,基本消除了电晕放电对污秽放电声发射信号的干扰,从而揭示了污秽放电的严重程度和声信号之间的关系,证明了声发射技术在绝缘子在线检测上的可行性。     

Acoustic emission of rolling bearings lubricated with contaminated grease

In elastohydrodynamic lubrication (EHL), an extreme smoothness of the contacting surfaces is essential for the formation of a thin lubricant film, which separates the moving surfaces from each other. Sharp asperities, in particular, are very detrimental for the sliding surfaces. Because of the limited thickness of the lubricating film, the contact zone is very vulnerable if the lubricant contains contaminants, especially if hard particles are present in the lubricant.The present paper focuses on the acoustic emission (AE) measurement method for the monitoring of the lubrication situation in a grease lubricated rolling bearing. The aim of the investigation was to clarify how the contaminants in the grease influence the acoustic emission of the rolling bearing. In the paper, the results of tests with clean greases and with deliberately contaminated greases, and the influence of the cleaning and re-greasing of the bearing are discussed. The results showed that the AE measurement indicated very clearly the lowest contaminant concentration included in the study that was as low as 0.02 weight-%. Small size contaminant particles generated a higher AE pulse count level than large size particles. The AE time signal analysis method proved to be a suitable method to indicate the hardness of the contaminant particles. Cleaning the bearing of contaminants and re-greasing with a clean grease reduced the AE level of the bearing.     

液压泵污染磨损的研究

本文评述了现有液压泵污染磨损理论,研究了污染物磨损性、颗粒尺寸及分布对液压泵污染磨损的影响。提出了泵的寿命决定于现场实际污染物的磨损性和泵内关键运动副动态间隙尺寸与污染颗粒尺寸的相对关系的污染磨损理论。建立了新的液压泵污染磨损模型,根据此模型可预测泵在实际工况下的寿命。     

室内污染物扩散的通风优化数值模拟

为了减小房屋装修后室内甲醛对人体的危害,了解不同通风方式及通风速度下室内甲醛浓度的分布特征是关键。本文采用CFD方法,模拟2种基本通风方式室内气流组织的流动形式,研究了不同通风方式、不同送风速度对室内甲醛的浓度分布的影响,数值模拟表明:与异侧送回风通风方式相比,同侧送回风形式更能有效减小室内甲醛的浓度,因而室内通风方式应优先选择同侧送回风。在同侧送回风气流组织形式下,送风速度过小或过大均致使人站或坐高度平面上甲醛浓度增大,因而应根据甲醛的散发强度,选择合适的送风速度,如在本文中送风速度以2m/s左右为宜。优化室内污染物扩散的通风形式,对室内通风设计和气流组织的研究具有一定的指导意义。