一、設備簡介

1、 Equipment introduction

      二級反滲透設備又稱為雙級反滲透，原水加壓送至預處理系統粗過濾，再進入精密過濾器過濾后，通過一級高壓泵加壓送至一級反滲透系統，該系統產出的水再由二級高壓泵加壓送至二級反滲透系統，生產出產品水，稱為二級反滲透。二級反滲透就是級反滲透的透過水經調整PH值后，再由級高壓泵送進級反滲透系統處理，從而獲得透過水的過程。二級反滲透的系統脫鹽率≥99.5%。這樣就能使含鹽量在1000ppm以下的原水，不經過離子交換直接處理水質能達到中國實驗室用水《GB6682-2008》三級水標準。進水要求：污染指數：<5;水溫：10-35；ph值：2-11；游離氯：<0.1ppm；濁度：<1。其產水電導率一般為5uS/cm以內，含鹽量<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、設備原理

2、 Equipment principle

     反滲透是一種借助選擇透過（半透過）性膜的功能，以壓力為推動力的膜分離技術，膜元件由反滲透膜導流布和中心管等制作而成，將多根RO膜元件裝入不銹鋼耐壓容器內，組成RO組件。本裝置是脫鹽系統的關鍵，成熟的工藝設計、合理的控制、操作及管理，直接決定著系統的正常、穩定運行。并關系到反滲透膜的使用壽命，經反滲透處理后的出水，去除了絕大部分無機鹽和幾乎的物，微生物（、熱源等）從而確保了本系統產品水的高質量、高品質。完成預處理后的出水其出水由淤積密度指數SDI測試儀監測，當SDI值<4時，即可進入RO系統，由高壓泵增壓后進入反滲透系統，RO出水一部分（脫鹽純水）去儲水箱，另一部分由管道匯集后成濃水（主要含有鹽份、機械雜質、膠體、物等）隨小部分未透過水排入下水道。

      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、工藝流程      

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

 四、技術參數

  4、 Technical parameters

產水量

Water yield

根據需求訂制（0.25-500噸/時）

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

原水源

Raw water source

自來水或地下水（電導率小于400us/cm）

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

產水水質

Quality of produced water

電導率小于5us/cm

The conductivity is less than 5 US / cm

設備功率

Equipment power

1.5KW-800KW

1.5KW-800KW

運行狀態

running state

自動運行、定時反洗

Automatic operation and timing backwashing

反洗頻率

Backwash frequency

隨進水水質而變化（1～3天）

Change with influent water quality (1-3 days)

化學清洗

chemical cleaning

隨膜材質及膜污染情況而定

It depends on membrane material and membrane fouling

產品特點

Product features

無人值守、高集成、運行穩定、水質可靠

Unattended, high integration, stable operation and reliable water quality

   五、設備優點

    5、 Equipment advantages

1、反滲透是在室溫條件下，采用無相變的物理方法使水得以淡化、純化。

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

2、水的處理依高壓泵壓力作為推動力，其能耗在許多處理方法中。

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、不用大量的化學藥劑和酸、堿再生處理。

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

4、無化學廢液及廢酸、堿排放、無廢酸、堿的中和處理過程，無環境污染。

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

5、系統簡單，操作方便，產品水質穩定，可以取得較高的純水。

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

6、適用于較大范圍的原水水質，既適用于苦咸水、海水及污水的處理，又適用于低含鹽量的淡水處理。

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、設備占地面積小，需要的空間少；運行維護和設備維修量極低。

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

      六、應用領域

      6、 Application fields

反滲透設備在電子、化工、食品、飲料、生物制藥、醫療機構等行業內得到了廣泛應用。

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