电渗析海水淡化(国外英文资料).docVIP

电渗析海水淡化(国外英文资料) (8) start the pickling pump for 30 minutes ~ 1 hour (9) drain the acid Rinse and rinse for 5 minutes (11) rinse and rinse. Craft design 7.1 electrodialysis water quality requirements Water temperature: 5-40 OC consumption of oxygen 3mg/L (k), free chlorine 0.2 mg/L, iron 0.3 mg/L, manganese 0.1 mg/L. Turbidity: 1.5-2.0-mm partition board 0.3 mg/L, 0.5-0.9 mm partition 0.3 mg/L, pollution index SDI 7 (EDR). 7.2 electrodialysis desalination process principle Electrodialysis is a technique of separation of ions from aqueous solution by using ion-exchange membrane to remove ions from aqueous solution. As shown in figure 6, electrodialyzer generally by cation exchange membrane and anion exchange membrane composite between anode and cathode, alternately by a Yin and a zhang membranes to form a membrane, can be assembled into a separate room, when sodium chloride aqueous solution through the compartment between two film, under the effect of electric field, the positively charged sodium ions in the solution for the directional migration in a row, cation exchange membrane permeate through the negatively charged, blocked by anion exchange membrane; At the same time, the chlorine case with negative congratulations in the solution permeates through the anion exchange membrane. The result is an increase in the concentration of ions in an aqueous solution, and the concentration of ions in the other chamber of the solution. A room called a condensed chamber, called a solution or brine. The lower concentration of an ion concentration is called a desalination chamber, which is called a dilute solution or fresh water. The ions are separated and condensed, and the water is watered down. Figure 6 shows the principle of electrodialysis 7.3 process design The detailed process flow of water desalination method is as follows: Figure 7 shows the simple schematic of the process flow of water circulation desalination 7.3.1 seawater pretreatment In order to meet the abo