oneRaw water quality and quantity requirements

1. The system requires a water inflow of 16-20m ³/h to ensure a water production rate of ≥ 12m ³/h.

2. The salt content of the raw water is relatively stable, and the conductivity of the raw water is designed to be ≤ 800 micro Siemens, with a coefficient of variation K ≤ 1.2. Other indicators refer to the standard for drinking water.

twoSystem Technical Parameter Table

3、 Main process introduction

3.1counter-infiltration system

Reverse osmosis devices mainly remove over 99% of anions, cations, organic matter, heat sources, and bacteria from water during the process. The reverse osmosis (RO) desalination system consists of RO membrane components, high-pressure pumps, RO cleaning devices, etc.

Reverse osmosis is a membrane separation technology that utilizes the function of selectively permeable (semi permeable) membranes, with pressure as the driving force. The membrane element is made of reverse osmosis membrane guide cloth and tubes, and multiple RO elements are installed in a stainless steel pressure resistant shell to form an RO component. The key to this desalination system, mature process design and reasonable operation, control and management, directly determine the normal and stable effluent of the system. And it is related to the service life of the reverse osmosis membrane. After reverse osmosis treatment, the effluent removes the vast majority of inorganic salts and almost all organic matter, microorganisms (bacteria, heat sources, etc.), thus ensuring the high quality and high quality of the product water in this system.

The effluent after pre-treatment is monitored by a sedimentation density index (SDI) tester. When the SDI value is less than 4, it can enter the RO system and be pressurized by a high-pressure pump before entering the reverse osmosis system (RO). The reverse osmosis effluent (desalinated pure water) is sent to the intermediate water tank, while the other part is collected by pipelines and becomes concentrated water (mainly containing salt, mechanical impurities, colloids, organic matter, etc.), which is discharged into the sewer with a small amount of unfiltered water. The main equipment for reverse osmosis uses high desalination rate and low-pressure CPA3LD-8040 aromatic polyamide membrane components produced by Heidelberg Corporation in the United States. This membrane element belongs to the energy-saving low-pressure membrane and is an advanced roll type RO membrane element in the world. It has the advantages of compact structure, particularly large water production (single RO membrane can produce up to 1.3t/h), high desalination rate (single membrane test data>99.7%), low operating pressure, good resistance to bacterial erosion, and wide applicable pH range (pH 3-10).

3.2、 EDI electric desalination system

EDI (Electrodeionization) is a revolutionary water treatment technology that uses electrically regenerated ion exchange resin desalination process to replace traditional mixed ion exchange desalination process. The EDI process uses an ion selective membrane and ion exchange resin sandwiched between two electrical terminals under direct current voltageendThe DC power electric field removes ions from RO pretreated water. The RO water flowing into the EDI module is divided into three independent streams: the production water stream, the concentrated water stream, and the water stream. The EDI process removes unwanted ions from water by relying on resin adsorption in the fresh water chamber to transfer them to the concentrated water chamber. The ion exchange reaction takes place in the freshwater chamber of the module, where the anion exchange resin releases hydroxide ions (OH)^-）And exchange anions (such as chlorides, Cl) from dissolved salts^-）. Similarly, cation exchange resins release hydrogen ions (H)⁺）And exchange cations (Na) from dissolved salts⁺）High quality modules can continuously generate up to 18M Ω CM's high-purity water. Through this technology, dissolved salts can be removed at a lower energy cost without the need for chemistry.

Characteristics of EDI
⑴ Continuous operation, stable product water quality
⑵ Easy to achieve fully automatic control, simple and reliable operation
⑶ No need to use acid or alkali
⑷ No need for acid-base storage and acid-base dilution transportation facilities
⑸ Reliable use, avoiding workers' contact with acid and alkali
⑹ Will not shut down as a result
⑺ Save water and sewage treatment facilities
High water production rate (up to 95%)
Small footprint
Reduce operating and maintenance costs
⑾ Modular equipment units that can flexibly combine various flow rates of water purification facilities
12. Simple installation and low cost