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（1） Judgment question: We can dispose of domestic garbage in the way we want. （ (wrong) 2. Within the closed protection area of sandy land, all activities damaging vegetation are prohibited. （ Right) 3. Poor visibility in haze days is caused by PM2.5. （ (wrong) 4 coal and oil are renewable ene...

Compared with other sterilization and disinfection methods, ultraviolet sterilizer and ozone generator are more widely used in water treatment industry in recent years. Ultraviolet rays can destroy bacterial DNA, and ozone can play a strong role in oxidation. They have their own advantages in steril...

1. What is water self purification? Self purification of water body: the polluted river reduces or transforms the concentration of pollutants through physical, chemical and biological effects, and the water body returns to its original state, or reduces from exceeding the water quality standard to ...

泵的扬程计算是选择泵的重要依据，泵扬程与流量的关系可以参照下面这张图。 泵扬程由管网系统的安装和操作条件决定，计算前应首先绘制流程草图，平、立面布置图，计算出管线的长度、管径及管件型式和数量。 一般管网如下图所示 D——排出几何高度，m； 取值：高于泵入口中心线：为正；低于泵入口中心线：为负； S——吸入几何高度，m； 取值：高于泵入口中心线：为负；低于泵入口中心线：为正； Pd、Ps——容器内操作压力，m液柱（表压）； 取值：以表压正负为准 Hf1——直管阻...

混凝？絮凝？助凝？ 在水处理药剂中，应用最广泛的是当属混凝与絮凝、聚合氯化铝与聚丙烯酰胺了。那么两者在使用过程中具体有哪些注意事项？让我们一来一探究竟。 凝聚：投加混凝剂后水中的胶体失去稳定性，胶体颗粒互相凝聚，结果形成众多的“小矾花”。 絮凝：凝聚过程中形成的“小矾花”通过吸附、卷带、架桥等作用，形成颗粒较大絮凝体的过程。 混凝：是凝聚、絮凝两个过程的总称。是水中胶体粒子及微小悬浮物的聚集过程。 也就是说，“混凝”包含了从原水投药到水混合、药反应（脱稳、絮凝）再到形成大颗粒的絮凝物的整个过程。 而絮凝是指胶体...

1、 What is ultrafiltration membrane Ultrafiltration membrane is one of the earliest developed polymer membranes, and it is a microporous filter membrane with a rated pore size range of 0.001-0.02 μ M. The solvent in the solution and some of the solutes with low molecular weight penetrate the oth...

1、 What is ultrafiltration membrane Ultrafiltration membrane is one of the earliest developed polymer membranes, and it is a microporous filter membrane with a rated pore size range of 0.001-0.02 μ M. The solvent in the solution and some of the solutes with low molecular weight penetrate the oth...

1、 Introduction to water treatment resin Water treatment resin is divided into cationic resin and anionic resin. Cationic resin is subdivided into sodium type and hydrogen type. Sodium type resin exchanges calcium and magnesium ions in water into sodium ions to soften water. Hydrogen resin is to ex...

1、 Noun interpretation (this paper summarizes from eight aspects) 1. Raw water Raw water: refers to the natural water without any treatment or the tap water of the city, etc. is also called raw water 2. Clear water clear water: water that removes suspended impurities from raw water. 3. Desalted w...

1. Why do COD and BOD are often used in wastewater analysis? There are many organic substances in the wastewater, including more than ten, dozens, and even hundreds of organic substances, which can be often encountered. If the qualitative and quantitative analysis of organic substances in the waste...

How often should the RO system be cleaned Generally, when the standardized flux decreases by 10-15%, or the desalination rate of the system decreases by 10-15%, or the operating pressure and the pressure difference between sections increase by 10-15%, RO system should be cleaned. The cleaning frequ...

Wastewater treatment process 1. Technological process of sewage treatment plant picture 2. Wastewater treatment process of diversion biological aerated filter picture 3. Traditional activated sludge process for nitrogen removal picture 4. Two stage biological nitrogen removal process picture...