EDIUltra-pure water treatment equipment is a kind of equipment that integrates ion exchange technology,A pure water manufacturing technology that combines ion-exchange membrane technology and ion electromigration technology.HasNo acid or alkali regeneration is required;The operation is continuous and simple;Installation requirementsWith advantages such as simplicity, it has gradually been applied in various industrial fields. Its normal operation directly affects production efficiency. Let's talk about the impact belowEDIThe ultrapure water equipment is in operation6bigFactors.

I. Conductivity of the influent water

When water entersWhen the conductivity of the raw water rises beyond a certain range, the working zone of the membrane block moves downward, causing the regeneration zone to disappear and the working zone to penetrate. Most of the filling resin inside the membrane block becomes saturated and ineffective. At the same time, the ion concentration in water increases. Under the condition that the voltage remains constant, the current increases, thereby weakening the process of ionizing water, and the corresponding water is ionizedH⁺,OH^-The reduction directly leads to a deterioration in the regeneration of the resin. In this way, when the influent water quality deteriorates, the membrane blocks will gradually penetrate starting from weak electric ions. 

Ii. Influent flow rate

EDIUltra-pure water equipmentUnder the condition of constant water production capacity, the poorer the influent water quality, the heavier the unit treatment burden of the membrane block, and the smaller the influent flow rate should be adjusted. During the start-up stage of the membrane block, it should be noted that excessive instantaneous flow can cause perforation of the membrane.

Since the electron flow in the membrane block is mainly transferred through the filling resin, the concentrated water current, to a certain extent, has become the key factor affecting the migration of the electron flow in the membrane block.Reducing the flow rate of concentrated water can increase the current of the system and improve water quality to a certain extent. However, the concentrated water flow rate is not the smaller the better. When the concentrated water flow rate is too small, it will cause a greater concentration difference on both sides of the membrane, resulting in concentration diffusion and affecting water quality. On the other hand, due to weak electric ionsSiThe solubility of its ionic compounds is very low, so it is prone to saturation in low-flow concentrated water, thereby affecting the removal of weak ions. The flow rate of concentrated water is generally the same as that of the influent5%-10%It is appropriate. The main function of electrode water is to cool the electrode and remove the gas produced on the electrode surface. The general flow rate of electrode water is that of the incoming water1%Left and right. When the electrode water passes through"Constant valueIf the gas on the electrode surface cannot be removed in time, it will affect the operation of the entire membrane block.

Iii. Water InflowpHvalue

Water ingresspHThe value indicates the inflow of waterH+The content of the influent is generally controlled at5-9.5Between. Under normal circumstancespHThe low value is due toCO₂It is caused by the dissolution of.CO₂It is also one of the factors leading to the deterioration of water quality, so inEDIBefore the membrane block system, a decarbonization device can generally be installed to make the waterCO₂Control5mg/LBelow. In waterpH"Value andCO₂There is a certain dissolution relationship, theoretically being deceivedpH>10At this time, the removal efficiency is excellent and highpHThe value is helpful in removing weak ions, but in advancingEDIRemoval before the membrane block systemCa²⁺,Mg²⁺Plasma.

Iv. Inlet Water Temperature

Temperature has a direct impact on system pressure and water production resistance, usuallyEDIUltra-pure water equipmentThe inlet water temperature should be controlled at5-35°Between them, the optimal temperature is within25°Left and right. A decrease in temperature will reduce the activity of water, which is macroscopically manifested as an increase in water viscosity and a rise in system pressure.

V. Inlet Water Pressure

The pressure of the product water under normal circumstances>Concentrated water pressure>The electrode water pressure can effectively prevent the phenomenon of concentrated water spreading and contaminating the product water. The change in pressure is still a judgmentEDIUltra-pure water equipmentAn effective means to determine whether the membrane block is contaminated. When the pressure difference between the inlet and outlet of the concentrated water increases, it is often accompanied by blockage in the concentrated water pipeline. At this time, it is necessary to clean the pipeline, carry out chemical cleaning or other means to reduce the pressure difference. ThereforeEDIUltra-pure water equipmentAt the inlet of the membrane block, it should be ensured that the pollution index of the influent water is within the qualified range. 

sixPollutants

rightEDIUltra-pure water equipmentThe pollutants that have a significant impact include hardness (calcium, magnesium), organic matter, solid suspended matter, variable-valence metal ions (iron, manganese), oxidants (chlorine, ozone), and carbon dioxide.CO₂And, it should be inEDIThe pretreatment process removes these pollutants and improvesEDIPerformance.

chlorineandOzoneIt will oxidize the ion exchange resin and ion exchange membrane, causingEDIThe functionality of the components has decreased. Oxidation can also causeTOCThe content has significantly increased, contaminating the ion exchange resin and membrane and reducing the ion migration speed. In addition, oxidation causes the resin to crack, and the pressure loss through the components will increase.

ironOther variable-valence metal ions can catalyze the oxidation of resins, significantly reducing the performance of resins and membranes.

HardnessIt can be used in reverse osmosis andEDICaused in the unitScalingScaling usually occurs on the surface of the concentrated water chamber membrane, wherepHThe value is relatively high. At this point, the pressure difference between the concentrated water inlet and outlet increases, and the current decreases. Reducing the hardness of the inlet water to a minimum will extend the cleaning cycle and improve itEDIUltra-pure water equipmentWater utilization rate.

Suspended matterandColloidIt will cause contamination and clogging of the membrane and resin, and the clogging of the resin gap leads toEDIThe pressure loss of the component increases.

Organic matterThe ions attracted to the surface of the resin and membrane cause contamination, reducing the efficiency of ion migration in the contaminated membrane and resin, and the resistance of the membrane stack will increase.

Carbon dioxideThere are two effects. First,CO3^2-andCa²⁺,Mg²⁺The formation of carbonate scale is related to the ion concentration of the feed water andpHRelevant. Secondly, due toCO₂The charge andpHIt is related to the value, and it isROandEDIThe removal of all depends on its charge, so its removal efficiency is variable. Even the lower onesCOAll can effectively reduce the resistivity of the product water.

 The above are the influences.EDIThe ultrapure water equipment is in operation6bigFactors, if there areEDIIf you have any questions regarding operation, please consult Beijing Yuanlai Water Treatment Equipment Co., LTD.15With years of focus on the water treatment industry, you can trust us!