EDI (Electrodeionization) modules are widely used in the deep treatment of water. However, in actual use, there may be water leakage problems, which not only affect the normal operation of the equipment but also may cause damage to the surrounding environment. The following is a detailed analysis of the causes of water leakage in EDI modules.

Sealing related issues

The seal isEDI moduleAn important component for preventing water leakage, commonly used seals such as sealing rings. As the usage time increases, the sealing ring will experience aging. This is because the sealing ring is in long-term contact with water, chemicals, etc., and its material will gradually undergo chemical reactions, leading to a decrease in elasticity, hardening, and brittleness. Once the sealing ring ages, it cannot tightly adhere to the various connection parts of the module, resulting in gaps where water will seep out.

In addition, if the sealing ring is subjected to improper external forces during installation, it may deform. For example, excessive stretching or squeezing during installation can alter the shape of the sealing ring and prevent it from returning to its original sealing state. When the module generates pressure during operation, the deformed sealing ring becomes difficult to effectively seal, leading to water leakage. It is also possible that the sealing ring is missing or detached during transportation, installation, or maintenance, which directly leads to the loss of the sealing link, and water will inevitably leak out from the corresponding position.

Abnormal module structure

　　EDI moduleThere are key structural components such as partitions and central pipes inside. The function of a partition is to separate different water flow channels, ensuring the normal flow of water and ion exchange process. If the spacing design of the partitions is unreasonable, the impact force of water flow during module operation may cause displacement or deformation of the partitions. When the position of the partition changes, it will destroy the original sealing structure, causing water leakage between different channels.

The central pipe is an important component of the module, providing a channel for the flow of water. If the position of the central pipe is not installed properly, resulting in deviation or tilt, it will cause poor sealing with surrounding components. Moreover, the casing of the module may deform if it is impacted by external forces during transportation or use. After the deformation of the shell, the clearance between it and the internal components will change, and the originally tight connection will become loose, causing water to leak out from these loose parts.

Internal burning or deformation

The EDI module has certain requirements for operating conditions during its operation. If the module operates at a low water level for a long time, the electrodes inside the module may overheat due to excessive local current density. Similarly, high current operation can cause a sharp increase in temperature inside the module. Excessive temperature can cause some components inside the module, such as ion exchange membranes and electrodes, to burn out. Components that have been burned out may experience damage, deformation, and other issues, which can damage the sealing structure inside the module and lead to water leakage.

Damaged resin or film

Resin and film areEDI moduleThe key material for achieving ion exchange and separation in China. When the incoming water quality is poor, the water may contain a large amount of impurities, such as suspended solids of large particles, colloids, etc. These impurities will wear down the resin and cause it to break. In addition, if the water contains high hardness ions, it is easy to form scale on the surface of the membrane during the ion exchange process. Scaling can increase the burden on the membrane, affect its normal performance, and even lead to membrane perforation. In addition, if the content of oxidants in water, such as residual chlorine, is too high, it can cause oxidative corrosion to the resin and membrane, causing them to break and leading to water leakage.

Improper operation and maintenance

During the operation of the EDI module, if not cleaned for a long time, various impurities will gradually deposit in the water, forming scales. Scaling can affect the internal water flow channels of the module, causing local pressure to rise, thereby damaging the sealing structure and causing water leakage. In addition, improper operation during module maintenance, such as accidentally touching the sealing parts when disassembling and installing components, may cause the sealing components to shift or be damaged, resulting in water leakage.

Inlet water quality issue

The quality of the incoming water is crucial for the normal operation of the EDI module. If the incoming water contains large particles, these particles will enter the interior of the module with the water flow, which may block the water flow channel or directly cause physical damage to the components inside the module, damaging the sealing structure. High hardness water makes it easier for scaling to occur inside the module, increasing the risk of water leakage. The residual chlorine and other oxidants in the water will react chemically with the materials inside the module, corroding components such as resin and membranes, causing them to be damaged and leak water.