Process and apparatus for removing nitrates from a water stream

Details Process and apparatus for removing nitrates from a water stream Process and apparatus for removing nitrates from a water stream

1990-04-25

1992-03-10

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204151, 204301, B01D 1302, C25B 700

Patent

active

050947320

ABSTRACT:
Process and apparatus for removing nitrates during the treatment of process water, based on an electrodialysis process where, through the use of suitable membranes (3, 4), a preferential migration of nitrate ions NO.sub.3.sup.-, and thus selective removal of toxic nitrates, is achieved. Anion exchange membrane (3) having a selectivity for chloride transport over sulfate transport of >1. Cation exchange membrane (4) having a selectivity for Na.sup.+ transport over Ca.sup.2+ transport of >1. The membranes (3, 4) are plastic membranes having a surface treatment.

REFERENCES:
patent: 3510417 (1970-05-01), Mizutani et al.
patent: 3510418 (1970-05-01), Mizutani et al.
patent: 4246092 (1981-01-01), Perry et al.
patent: 4253929 (1981-03-01), Keritsis
patent: 4715939 (1987-12-01), Ball et al.
patent: 4717450 (1988-01-01), Shaw et al.
patent: 4802966 (1989-02-01), Aoki et al.
"Optimization of Flow Design in Forced Flow Electrochemical Systems, with Special Application to Electrodialysis", A. Sonin et al., Ind. Eng. Chem., Process Des. Develop., vol. 13, No. 3, 1974.
"Separation of Nitrate from Well Water by Membrane Processes (Reverse Osmosis) Electrodialysis Reversal", R. Rautenbach, et al., AQUA No. 5, 1986, pp. 279-282.
"Nitrate-Selective Anion-Exchange Membranes", A. Eyal, et al., Journal of Membrane Science, 38 (1988), pp. 101-111.
"Effect of Turbulence on Limiting Current in Electrodialysis Cells", D. Cowan et al., Industrial and Engineering Chemistry, vol. 51, No. 12, Dec. 1959.

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