侧沟式固液分离器的污泥回流机理研究

运用流态分析手段研究了侧沟式固液分离器的污泥回流机理,并对侧沟式固液分离器内的污泥回流机理提出了新的解释,补充完善了原有理论。     

侧沟式固液分离器强化污泥回流研究

通过对山东泗水污水处理厂一体化氧化沟*固液分离器运行性能的现场试验,着重考察其固液分离和污泥回流效果,并根据其机理提出了采用泵抽吸的方法来强化分离器的性能,为在实际工程中更好地使用固液分离器提供参考。     

氧化沟沟内分离技术初探

传统氧化沟的泥水分离,一般是将沟中的混合液送到二次沉淀池中进行的,澄清液可直接排放到水体中,一部分沉淀下来的污泥再回流,到氧化沟中,并定期从系统中排除剩余污泥,以维持沟中污泥浓度平衡。这种分离回流方     

斜板沉淀池在一体化氧化沟中的作用

对一体化氧化沟中斜中斜板沉淀池内部的流态及固液分离效果进行了研究,探讨了其分机理和影响因素。试验结果表明,沉淀池底部设有的特殊过渡区具有良好的消能作用,可使斜板沉淀区的流态快速从紊流转变为层流,达到最佳沉淀效果,斜板区的分离过程是污泥沉淀与污泥悬浮层的过滤,捕获共同作用的结果,其效率比一般二沉池高,水力停留时间＞30min,出水SS值＜38mg/L。     

双沟式氧化沟与三沟式氧化沟的实际运行效果比较

比较了三沟式氧化沟和双沟式氧化沟在莒县污水厂实际运行的工艺参数、处理效果及经济成本。结果表明:双沟式氧化沟对BOD5、COD和氨氮的去除率分别达到93.3%、88.4%、89.5%,均高于三沟式氧化沟的去除效果;双沟式氧化沟占地面积较三沟式氧化沟小10%,但土建费用较三沟式氧化沟高15%;三沟式氧化沟生物处理部分电耗比双沟式氧化沟高23.7%,但其污泥转输与处置费用较双沟式氧化沟低21.1%。     

五沟式氧化沟的设计及运行

从设计和运行两个方面对南通市污水处理厂的五沟式氧化沟工艺进行了总结。投产以来的运行实践表明，该工艺的容积、设备利用率高，并可实现全时反硝化；同时也存在着需进一步提高除磷效率、各沟中污泥浓度分布不均等问题，有待进一步完善。     

合建式氧化沟的改进

为使合建式氧化沟的运行效果更好，根据大关污水处理厂实际问题，进行了一些有效的改造，结论是：合建式氧化沟沉淀区不宜设斜管；把造近沉淀区的曝气转刷改为反向旋转；把“正人字”整流板改装为“斜人字”整流板；增加沉淀区水面的洒水系统。     

环境友好型通沟污泥处理工程实践

上海市金山区通沟污泥处理工程借鉴上海市其他通沟污泥处理站的运行经验，针对超细砂（粒径<0.2 mm）含量高且难分离的特性，确定了水力旋筛+砂石分离工艺，对污泥进行分级分离，取得了良好的效果。将通沟污泥分离为粗大物质、矿化物质、有机栅渣和超细砂，并实现资源化利用。工程采用生物除臭系统，除臭效果满足《城镇污水处理厂污染物排放标准》（GB 18918—2002）废气排放厂界一级排放标准和上海市地方标准《城镇污水处理厂大气污染物排放标准》（DB31/982—2016）。     

开孔圆筒式液体旋流分离器的研究

介绍最新设计制作的一种开孔圆筒式液体旋流分离器及其液固分离实验研究。实验结果表明：开孔内筒式旋流分离器可以消除存在于普通液体旋流分离器中心部的空气柱。与普通液体旋流分离器相比，开孔内筒式液体旋流分离器具有较高的分离效率和较低的压力损失。     

三沟式氧化沟污泥分布不均的改善

就枣庄市污水处理厂三沟式氧化沟污泥的分布、变化及影响因素等问题进行了初步研究，指出三沟污泥浓度相差较大的原因在于其运行模式和各运行阶段的时间分配，通过增加反硝化阶段的时间可以缩小污泥浓度的差距；另外可以通过安装导流栅板来解决侧沟污泥浓度的差异问题。     

Oil removal from water in parallel plate gravity-type separators

Aspects of oil removal by gravity separation in parallel plate separators have been investigated both theoretically and experimentally. Attention has been paid to the possible influence of retention time distribution, co- or countercurrent flow (in tilted plate separators) and to the effect of perforation of the plates. Perforation enables an easy removal of separated oil in horizontal plate separators. It appears that the overflow rate-related to the horizontal projection of the real plate area-determines the performance of a plate separator in all these cases. A residence time distribution will lower the separation efficiency only when it is caused by a velocity profile over the width of the tank or by an extremely unequal distribution of the influent over the plates. A tilted full plate separator and a horizontal perforated plate separator with the same overflow rate perform equally well as to separation efficiency; only secondary, practical reasons will determine the choice between either construction.     

PLC和触摸屏在粗煤泥分选机控制设计中的应用

针对目前水介流化床粗煤泥分选机自动控制水平低等问题,结合PLC和触摸屏研发了粗煤泥分选机的测控系统,经在龙煤集团选煤厂现场应用并取得了很好的分选效果,提高了选煤厂效益。     

Steel-concrete-steel sandwich composite structures subjected to extreme loads

This paper summarizes the latest research and development work on steel-concrete-steel (SCS) sandwich composite structures for the use as Arctic offshore platform, and to resist impact and blast loads. Current development of ultra-lightweight cement composite (ULCC) and a floatable structural cement composite (FSCC) to be used as infilled materials for SCS sandwich structure are presented. This paper aims to advance the application of SCS sandwich composite with the use of steel plate and lightweight concrete materials. A series of tests on lightweight SCS sandwich panels with shear connectors has been carried out. The superior performance of SCS sandwich panel is demonstrated. The results show that SCS sandwich with novel J-hook connectors is effective in preventing plate separation from concrete core, maintaining the structural integrity.     

广义升流式污泥床反应器与相分离反应器的开发与应用

讨论了ＵＡＳＢ反应器，污泥颗粒化和三相分离器的特征，并将其引入好氧生物处理领域，从广义的角度定义了升流式污泥床效应器和相分离反应器，介绍了好氧污泥床反应器和好氧相分离反应器的研究及应用情况。     

Analysis and design of steel-concrete composite sandwich systems subjected to extreme loads

This paper presents the design guide based on analytical, numerical and experimental investigation of Steel-concrete-steel (SCS) sandwich structural members comprising a lightweight concrete core with density ranged from 1300 to 1445 kg/m³ subjected to static, impact and blast loads. The performance of lightweight sandwich members is also compared with similar members with normal weight concrete core and ultra high strength concrete core (f _c = 180 MPa). Novel J-hook shear connectors were invented to prevent the separation of face plates from the concrete core under extreme loads and their uses are not restricted by the concrete core thickness. Flexural and punching are the primary modes of failure under static point load. Impact test results show that the SCS sandwich panels with the J-hook connectors are capable of resisting impact load with less damage in comparison than equivalent stiffened steel plate panels. Blast tests with 100 kg TNT were performed on SCS sandwich specimens to investigate the key parameters that affect the blast resistance of SCS sandwich structure. Plastic yield line method is proposed to predict the plastic capacity and post peak large deflection of the sandwich plates. Finally, an energy balanced model is developed to analyze the global behavior of SCS sandwich panels subjected to dynamic load.     

Development of an electromagnetic hydrocyclone separator for purification of wastewater

A number of various organic and inorganic contaminants are commonly present in the technological fluids hindering production quality. Importantly, waste influents must be purified to meet the appropriate environmental standards for their disposal. This paper deals with the development of a treatment technique for technological and wastewater streams allowing the separation of microscopic droplets of water, sand, oil and other organic and inorganic contaminants. Some existing approaches and processes for treatment of contaminated fluids are briefly reviewed and the design of an electromagnetic hydrocyclone separator is presented in this paper. The effect of the main forces on the separation of small‐sized impurities (<10 μm) is analysed. The experimental tests demonstrated the efficiency of the developed apparatus in purifying the industrial wastewaters of the textile dyeing industry.     

现代立窑企业选粉技术评析

水泥新标准的颁布实施，对水泥的细度状态提出了更高的要求，选粉机的工作状态如何适应新标准的要求成为水泥企业关注的课题。阐述了选粉机分级效率的评价方法，分析了选粉机内部结构对选粉机分散、分级、收集性能的影响，对新型思子式选粉机选粉效果进行了评价。     

A novel tribo-electrostatic device for the treatment of granular waste plastics mixtures

The main objective of this work is the design, manufacture and functional validation of a tribo-electrostatic separator for granular mixtures, equipped with a grounded metal-belt conveyor electrode. Triboelectric charging of the materials was done using a rotary tubular device. The separation experiments were performed on a granular mixture composed of three different plastic materials polycarbonate, high-density polyethylene and polyvinyl chloride. The particles previously charged were deposited on the metal-belt conveyor that carried them through the separation region. The results obtained have shown the efficiency of this installation, which is useful for the treatment of mixtures composed of three different plastic materials.     

Design and development of a low cost technique for sorting household wastes using eddy current separation process

Recovery and recycling of metals from wastes have a major role in the global economy because of the scarcity of raw materials and the problem of environmental pollution. This paper reports a technical and economic study for the development of a low-cost eddy-current separator for household waste treatment. Waste treatment in African countries suffers a developmental delay owing to the cost of such equipment. On the basis of preliminary results obtained by numerical simulation of the physical phenomena, in order to test several possible configurations, a prototype device has been built and tested. The experimental results obtained have led to an optimal configuration in terms of separation efficiency. Thus, a second more efficient device has been successfully developed and tested. The economic analysis revealed the benefit of local manufacture for such a separator.