Electrodialysis and Electrodialysis Reversal by American Water Works Association PDF

By American Water Works Association

This handbook offers info on electrodialysis and electrodialysis reversal applied sciences in water treatment.
This truly written guide explains rules of operation, functions for water remedy, apparatus, method layout, expenses, pretreatment and posttreatment, set up, operation, upkeep, and disposal of focus

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Extra resources for Electrodialysis and Electrodialysis Reversal

Example text

The subsequent need for cleaning can be decreased with the selection of appropriate membranes (Hamada 1993). Faraday’s Law Faraday’s law is the basis for determining the amount of electrical current needed in an ED process to transfer a specific quantity of salt. It states that the passage of 96,500 A of electric current for 1 s will transfer 1 g equivalent of salt. The quantity 96,500 A s is called a faraday. In a sodium chloride solution, 1 faraday will transfer 1 g equivalent of sodium ions to the cathode and 1 g equivalent of chloride ions to the anode at 100 percent current efficiency.

4. Complete the system log sheet and verify that the operating settings are correct. Use the operation data sheet form (see Figure 4-3) and systems log sheet supplied by the vendor. Check electrode stream flowmeters to see that the electrodes are operating normally. If the pressure drop across the cartridge filter housing is more than 8 to 20 psi (55 to 140 kPa) greater than the operating inlet pressure, replace the cartridge according to the manufacturer’s instructions. If the pressure difference reaches 15 psi (100 kPa), an alarm condition will appear on the control panel.

EQUIPMENT SUBSYSTEMS _________________________________ This section contains a general description of available equipment. ED and EDR demineralizing systems consist of four subsystems — hydraulic, electrical, membrane stack, and chemical. Hydraulic Subsystem The major components of an ED or EDR hydraulic subsystem include • • • • • • low-pressure, stainless-steel centrifugal feed pump low-pressure, stainless-steel recirculation pump fiberglass cartridge filter corrosion-resistant piping manual flow-control valves motorized reversal valves (EDR only) 37 38 ELECTRODIALYSIS Source: Ionics Inc.

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