Demineralization plant

Acid regenerant infiltration (e.g., H2S04, HC1) from the regeneration of ion-exchange demineralization plant. 

Where an organic trap is part of a demineralization plant system, it is placed in the train upstream of the strong base anion (SBA) resin unit. When the organic trap resin is placed within the same pressure vessel, physically on top of the anion resin (stratified bed), in which case, as it forms part of the overall anion capacity, a weak base anion resin operating in the free base form is employed. 

Non-reactive ion-exchange resin. Commonly employed at a specific intermediate density to separate cation and anion resins in a mixed-bed demineralization plant, in order to limit contaminant leakage, especially from regenerants. 

Trends in ED appear to be reduction in pumping and direct ED energy, increase in electric current density, and the use of EDR and hybrid processes in plants in which the manufacturer of the demineralization plant owns and operates the plant, selling water to the user or water distributor. 

Operating Experience on a Large Scale Electrodialysis Water-Demineralization Plant... 

The water demineralization plant in Geleen (NL) for the production of boiler feedwater from surface water with a capacity of 1560 mVh uses RO and UF for the pretreatment [73]. In this study, a series of pilot scale study was made using different UF membranes and a suitable UF membrane was selected. As for the RO membrane, Filmtec BW 30 LE 440 was chosen primarily due to its high-flux and high-salt-rejection capacity. 

U.S. Office of Saline Water Local Demineralization Plants... 

Knowledge about the mechanism of deposition of corrosion products onto the fuel rod surfaces is still limited. The dissimilar elemental concentrations for the brushed and scraped fractions in the filter/demineralizer plants are probably due to the fact that these two fractions were created by different mechanisms. The brushed fraction most likely results from the deposition of suspended particles from the reactor water, while the scraped fraction is assumed to be formed by precipitation of dissolved corrosion product species. The axial distributions of both fractions of the deposits on the fuel rod surfaces usually show differences which also suggest that they were generated by different mechanisms. The brushed fraction shows a characteristic profile, in which the corrosion products deposit preferentially near the bundle inlet and which can be correlated with the fluid shear at the heat transfer surface. This distribution is consistent with the assumption that particle deposition is the predominant mechanism for the buildup of the loosely-adherent deposits, since low fluid shear favors particle deposition. On the other hand, the axial profile of the tenacious fraction is quite different, being relatively constant over the middle region of the bundle and decreasing towards each end. 

N Demineralization Plant Regeneration Waste Analysis Anion... 

N Demineralization plant Provided demineralized water for reactor primary coolant system. Reinforced concrete and structural steel, 82 X 78 X 40 ft high immediately west of 183-8 building with which it shares a common wall... 

The acid/caustic storage and transport system grouping includes all the process units, waste management units, unplanned releases, and pipelines associated with the storage and transport of acids and caustics used in the 163-N demineralization plant. Because of its location, the 124-N-l septic tank is also included in this grouping. The following potential sources are included in this grouping. 

N-6 Acid/Caustic Transfer Trench and Neutralization Unit. The unit is a polymer concrete-lined neutralization pit and acid/caustic transfer trench between the 163-N demineralization plant and the 108-N chemical unloading facility. The neutralization unit consists of two containment vaults one for sulfuric acid and one for sodium hydroxide. Each containment vault is approximately 1.8 m (6 ft) long by 1.8 m (6 ft) wide by 3 m (10 ft) deep. The trench, containing both acid and caustic piping, slopes toward the neutralization unit so that spills can be contained within the vaults. 

N-3 (163-N) Neutralization Pit and French Drain. The unit is a french drain and vault located immediately west of the 163-N demineralization plant. The unit was constructed in 1963 and is still in place (DOE-RL 1990). It serves as a spill containment unit for the two 38,000-L (10,000-gal) acid and caustic day tanks located immediately inside the 163-N building. A drain in the tank area leads to the unit. The vault is approximately 2.4 m by 7.6 m (8 ft by 25 ft) in size and approximately 2.4 m (8 ft) deep. The walls of the vault are constructed of concrete and the floor is unlined earthen material. Located in the vault is a 1.2- to 1.8-m (4- to 6-ft)-diameter french drain made of clay. The depth of the french drain is unknown. No liquid is currently present in the pit and french drain. 

N-8 Day Tank Vent French Drain. The unit is a french drain used to receive overflow of sulfuric acid from the 163-N demineralization plant sulfuric acid day tank. The unit is 1.2 to 1.8 m (4 to 6 ft) in diameter and consists of a clay pipe filled with lime to neutralize any sulfuric acid releases. It is located on the north side of the 163-N building. The unit was installed in 1963 and taken out of service on Hay Id, 1988 (DOE-RL 1990). 

The regeneration/filter backwash waste disposal area grouping includes those units that have received corrosive regeneration wastes from the 163-N demineralization plant and filter backwash water from the 183-N filtered water plant. This area has five potential sources. 

Acid and caustic regeneration effluent from the 163-N demineralization plant was neutralized In the 120-N-2 surface Impoundment. Approximately... 

---