一、设备简介

1、 Equipment introduction

      二级反渗透设备又称为双级反渗透，原水加压送至预处理系统粗过滤，再进入精密过滤器过滤后，通过一级高压泵加压送至一级反渗透系统，该系统产出的水再由二级高压泵加压送至二级反渗透系统，生产出产品水，称为二级反渗透。二级反渗透就是级反渗透的透过水经调整PH值后，再由级高压泵送进级反渗透系统处理，从而获得透过水的过程。二级反渗透的系统脱盐率≥99.5%。这样就能使含盐量在1000ppm以下的原水，不经过离子交换直接处理水质能达到中国实验室用水《GB6682-2008》三级水标准。进水要求：污染指数：<5;水温：10-35；ph值：2-11；游离氯：<0.1ppm；浊度：<1。其产水电导率一般为5uS/cm以内，含盐量<0.1㎎/L。

       The secondary reverse osmosis equipment is also known as two-stage reverse osmosis. The raw water is pressurized and sent to the pretreatment system for coarse filtration, and then to the precision filter for filtration. It is pressurized and sent to the primary reverse osmosis system through the primary high-pressure pump. The water produced by the system is then pressurized and sent to the secondary reverse osmosis system by the secondary high-pressure pump to produce product water, which is called secondary reverse osmosis. Secondary reverse osmosis is a process in which the permeated water of the secondary reverse osmosis is sent to the secondary reverse osmosis system for treatment by the high-pressure pump after adjusting the pH value, so as to obtain the permeated water. The desalination rate of two-stage reverse osmosis system is more than 99.5%. In this way, the raw water with salt content below 1000ppm can be directly treated without ion exchange, and the water quality can meet the grade III water standard of gb6682-2008. Requirements for water inflow: pollution index: < 5; Water temperature: 10-35; PH value: 2-11; Free chlorine: < 0.1ppm; Turbidity: < 1. The conductivity of the produced water is generally within 5us / cm, and the salt content is less than 0.1 mg / L.

二、设备原理

2、 Equipment principle

     反渗透是一种借助选择透过（半透过）性膜的功能，以压力为推动力的膜分离技术，膜元件由反渗透膜导流布和中心管等制作而成，将多根RO膜元件装入不锈钢耐压容器内，组成RO组件。本装置是脱盐系统的关键，成熟的工艺设计、合理的控制、操作及管理，直接决定着系统的正常、稳定运行。并关系到反渗透膜的使用寿命，经反渗透处理后的出水，去除了绝大部分无机盐和几乎的物，微生物（、热源等）从而确保了本系统产品水的高质量、高品质。完成预处理后的出水其出水由淤积密度指数SDI测试仪监测，当SDI值<4时，即可进入RO系统，由高压泵增压后进入反渗透系统，RO出水一部分（脱盐纯水）去储水箱，另一部分由管道汇集后成浓水（主要含有盐份、机械杂质、胶体、物等）随小部分未透过水排入下水道。

      Reverse osmosis (RO) is a kind of membrane separation technology driven by pressure with the help of selective (semi permeable) membrane function. The membrane elements are made of reverse osmosis membrane flow guide cloth and central tube. A number of RO membrane elements are put into a stainless steel pressure vessel to form ro components. This unit is the key of desalination system. Mature process design, reasonable control, operation and management directly determine the normal and stable operation of the system. And it is related to the service life of the reverse osmosis membrane. After the reverse osmosis treatment, the effluent can remove most of the inorganic salts and almost all the pollutants, microorganisms (, heat sources, etc.), so as to ensure the high quality and high quality of the product water of the system. When the SDI value is less than 4, the effluent can enter the RO system, which is pressurized by the high-pressure pump and then enters the reverse osmosis system. One part of the RO effluent (desalinated pure water) goes to the water storage tank, and the other part is collected by the pipeline to form concentrated water (mainly containing salt, mechanical impurities, colloid, water) With a small part of the water not through into the sewer.

 三、工艺流程      

  3、 Process flow                As shown in the picture "process flow diagram - secondary reverse osmosis"“

 四、技术参数

  4、 Technical parameters

产水量

Water yield

根据需求订制（0.25-500吨/时）

Customized according to demand (0.25-500 T / h)

原水源

Raw water source

自来水或地下水（电导率小于400us/cm）

Tap water or groundwater (conductivity less than 400us / cm)

产水水质

Quality of produced water

电导率小于5us/cm

The conductivity is less than 5 US / cm

设备功率

Equipment power

1.5KW-800KW

1.5KW-800KW

运行状态

running state

自动运行、定时反洗

Automatic operation and timing backwashing

反洗频率

Backwash frequency

随进水水质而变化（1～3天）

Change with influent water quality (1-3 days)

化学清洗

chemical cleaning

随膜材质及膜污染情况而定

It depends on membrane material and membrane fouling

产品特点

Product features

无人值守、高集成、运行稳定、水质可靠

Unattended, high integration, stable operation and reliable water quality

   五、设备优点

    5、 Equipment advantages

1、反渗透是在室温条件下，采用无相变的物理方法使水得以淡化、纯化。

1. Reverse osmosis is to desalinate and purify water by physical method without phase change at room temperature.

2、水的处理依高压泵压力作为推动力，其能耗在许多处理方法中。

2. Water treatment depends on the pressure of high-pressure pump as the driving force, and its energy consumption is in many treatment methods.

3、不用大量的化学药剂和酸、碱再生处理。

3. It doesn't need a lot of chemicals and acid and alkali regeneration treatment.

4、无化学废液及废酸、碱排放、无废酸、碱的中和处理过程，无环境污染。

4. No chemical waste liquid, waste acid and alkali discharge, no neutralization treatment process of waste acid and alkali, no environmental pollution.

5、系统简单，操作方便，产品水质稳定，可以取得较高的纯水。

5. The system is simple, easy to operate, and the water quality of the product is stable.

6、适用于较大范围的原水水质，既适用于苦咸水、海水及污水的处理，又适用于低含盐量的淡水处理。

6. It is suitable for a wide range of raw water quality, not only for the treatment of brackish water, seawater and sewage, but also for the treatment of fresh water with low salinity.

7、设备占地面积小，需要的空间少；运行维护和设备维修量极低。

7. The equipment covers a small area and needs less space; The amount of operation maintenance and equipment repair is very low.

      六、应用领域

      6、 Application fields

反渗透设备在电子、化工、食品、饮料、生物制药、医疗机构等行业内得到了广泛应用。

Reverse osmosis equipment has been widely used in electronics, chemical industry, food, beverage, biopharmaceutical, medical institutions and other industries.