How much does the EDI vehicle urea production water equipment cost

Double stage reverse osmosis EDI vehicle urea production water equipmentReverse osmosis equipment+EDI device:

Raw water → Raw water tank → Raw water booster pump → Quartz sand filter → Activated carbon filter → Scale inhibitor dosing equipment → Precision filter → High pressure pump → Reverse osmosis host → CQ2 degassing tower → Intermediate water tank → Intermediate water pump → EDI device → Ultra pure water

Electrodeionization (EDI) system is a scientific water treatment technology that purifies water by directing the movement of dielectric ions in the water through a separator under the action of a direct current electric field, and utilizing the selective permeation of ions by an exchange membrane. Between a pair of electrodes in an electrodialysis device, there are usually multiple sets of alternating arrangements of cathode membrane, anode membrane, and separator (A, B), forming a concentration chamber and a depletion chamber (i.e. cations can pass through the anode membrane, anions can pass through the cathode membrane) Cations in the dilute water migrate to the negative electrode through the cation membrane and are intercepted by the anion membrane in the concentrated chamber; The anions in the water migrate towards the positive electrode direction and are intercepted by the positive membrane in the concentration chamber. As a result, the number of ions in the water passing through the dilution chamber gradually decreases, becoming fresh water. In the concentration chamber, due to the continuous influx of anions and cations, the concentration of dielectric ions continues to increase, becoming concentrated water, thus achieving the purpose of desalination, purification, concentration or refinement.

Tap water often contains dissolved salts such as sodium, calcium, magnesium, chlorine, nitrate, and silicon. These salts are composed of negative ions (anions) and positive ions (cations). Reverse osmosis can remove over 99% of ions from it. Tap water also contains small amounts of metals, dissolved gases (such as CO2), and other weakly ionized compounds (such as silicon and boron) that must be removed in industrial processes.

The exchange reaction takes place in the pure chemical chamber of the module, where anion exchange resins exchange anions (such as chloride ion C1) in dissolved salts with their hydrogen and oxygen ions (OH). Correspondingly, cation exchange resins use their hydrogen ions (H) to exchange cations (such as Na) in dissolved salts.

Apply a direct current electric field between the anode (+) and cathode (-) located at both ends of the module. The potential causes ions exchanged onto the resin to migrate along the surface of the resin particles and enter the concentrated water chamber through the membrane. The anode attracts negative ions (such as OH, CI), which enter the adjacent concentrated water stream through the anion membrane but are blocked by the cation selective membrane, thus remaining in the concentrated water stream. The cathode attracts cations (such as H, Na) from pure water flow. These ions pass through the cation selective membrane and enter the adjacent concentrated water flow, but are blocked by the anion membrane, thus remaining in the concentrated water flow. When water flows through these two parallel chambers, ions are removed in the pure water chamber and accumulate in the adjacent concentrated water flow, which then carries them away from the module. The use of ion exchange resin in pure water and concentrated water is key to the ElectropupreEDI technology. An important phenomenon occurs in the ion exchange resin of the pure water chamber. In localized areas with high potential differences, the electrochemical reaction decomposes water to produce a large amount of H and OH. The local production of H and OH in mixed bed ion exchange resins allows for continuous regeneration of the resin and membrane without the need for chemical additives.

EDI membrane stack is composed of a certain number of units sandwiched between two electrodes. There are two different types of chambers within each unit: the fresh water chamber for desalination and the concentrated water chamber for collecting impurity ions removed. Fill the freshwater chamber with mixed cation and anion exchange resins located between two membranes: the cation exchange membrane that allows only cations to pass through and the anion exchange membrane that allows only anions to pass through. The resin bed utilizes direct current applied at both ends of the chamber for continuous regeneration. The voltage causes water molecules in the inlet water to decompose into H+and OH -. These ions in the water are attracted by the corresponding electrodes and migrate through the cation and anion exchange resins towards the corresponding membranes. When these ions enter the concentration chamber through the exchange membrane, H+and OH - combine to form water. The generation and migration of H+and OH - are the mechanisms by which resins can achieve continuous regeneration.

Double stage reverse osmosis EDI vehicle urea production water equipmentAdvantages:

1. No need for acid-base regeneration: In mixed beds, resin requires chemical acid-base regeneration, while EDI eliminates the processing and heavy workload of these harmful substances. Protecting the environment.

2. Continuous and simple operation: Due to each regeneration and changes in water quality in the mixed bed, the operation process becomes complex, while the water production process of EDI is stable and continuous, with constant water quality and no complex operating procedures, greatly simplifying the operation.

3. Reduced installation requirements: Compared to mixed beds with equivalent water treatment capacity, EDI systems have a smaller volume and adopt a modular structure that can be flexibly constructed according to the height and environment of the site. The modular design enables easy maintenance of EDI during production work.