Operations used for the treatment of wastewater in which change is brought about by means of or through the application of physical forces are known as physical unit operations. Because physical unit operations were derived originally from observations of the physical world. they were the first treatment methods to be used. Today, physical unit operations, as shown on Fig. 5-1, are a major part of most wastewater

6-1 Role of chemical Unit Processes In Wastewater Treatment The principal chemical unit processes used for wastewater treatment include(1)chemical coagulation, (2) chemical precipitation, (3)chemical disinfection, (4) chemical oxidation, (5)advanced oxidation processes, (6)ion exchange

The constituents of concern found in wastewater are removed by physical, chemical, and biological methods. The individual methods usually are classified as physical unit operations, chemical unit processes, and biological unit ds in which the application of physical forces ohysical unit operations include pr T3clarifiers

An understanding of the nature of wastewater is essential in the design and operation of collection, treatment, and reuse facilities, and in the engineering management of environmental quality. To promote this understanding, the information in this chapter is presented in eight sections dealing with (1)an introduction to the constituents found in wastewater, (2)sampling and analytical procedures, (3) physical characteristics, (4)inorganic nonmetallic constituents, (5) metallic constituents

7-1 Introduction to the Activated-Sludge Process Historical Development The activated-sludge p now used routinely for biological treatment of municipal and industrial dge process date back to the early 1880s to the work of stewater in tanks and the hastening of the oxidation quently by a number of investigators, ility could be secured by e Experiment Station

这里主要介绍如何用希望特性确定有源校正网络的参数 对于典型系统(如典Ⅰ,典Ⅱ系统)经过仔细的分析与探讨,在参数的配置与选取方 面,已有较成熟的经验,经过折衷的选择,可以兼顾系统各个方面的性能要求。因此,在 工程设计中,通常先对系统的固有部分进行简化处理,然后将系统校正成典型系统,以此 来确定调节器的类型和它们的参数配置

九十年代末的一个春天,我当时所在的一家知名的软件开发商在一家大型制造企业获得了 一项国家863CIMS项目,ERP被列为其中的一部分,另外还有CAD、CAPP、PDM系统,整个CIMS系 统投入近千万。本人作为ERP的实施顾问,参与了项目的全过程,在长达一年半的实施过程 中,对ERP有了更深的认识

1.1测量学的任务及其在建筑工程中的作用 1.2我国测量学发展概况 1.3地面点位的确定 1.4用水平面代替水准面的限度

一、课程性质与任务 结构力学是土木工程专业的一门主要技术基础课,属必修课性质。在学习 理论力学和材料力学的基础上,通过本课程的学习,使学生进一步掌握杆件结 构的计算理论和计算方法,了解各类结构的受力性质

一、课程性质和任务 结构力学提高课是在学习理论力学、材料力学、结构力学等门力学课程 后,为土木工程专业学生开设的一门力学提高课程,属于专业选修课性质。通 过本课程的学习,可使学生进一步掌握杆件结构的计算理论和计算方法,深入 了解各类结构的受力特性。为学习的有关专业课程以及进行结构设计和科学研 究打好力学基础,培养学生具有较强的结构分析与结构计算方面的能力