Method of removing nitrogen impurities from water using hydrocar

Details Method of removing nitrogen impurities from water using hydrocar Method of removing nitrogen impurities from water using hydrocar

1994-02-03

1995-12-19

Naff, David M.

Chemistry: molecular biology and microbiology

Process of utilizing an enzyme or micro-organism to destroy...

Destruction of hazardous or toxic waste

210601, 210605, 435166, 4352571, 435262, 435946, C02F 300, C02F 330, C12P 500, C12N 112

Patent

active

054767873

ABSTRACT:
Water containing an inorganic nitrogen-containing compound, such as water effluent from sewage treatment plant, is treated for the removal of the nitrogen-containing compound and for the production of hydrocarbons by proliferating microalga capable of consuming the nitrogen-containing compound and of producing the hydrocarbons as an intracellular product. After adjusting the water content, the resulting culture containing the proliferated microalga and clean water is heated at a high temperature and a high pressure to liberate the hydrocarbon from the microalga. The hydrocarbon is subsequently recovered by solvent extraction. Preferably the method of treating water for nitrogen impurities is carried out by culturing a proliferating hydrocarbon-producing microalga in contaminated water to obtain the proliferated microalga and purified water, then removing part of the purified water to obtain a first mixture containing the proliferated microalga and 60-98% by weight of water; further dissolving an alkaline substance in the first mixture to obtain a second mixture, applying heat to the second mixture in order to lyse and free the hydrocarbons from the microalga to form a third mixture. From the third mixture a free hydrocarbon product may be obtained.

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Mitsuda, "Protein isolates from Chlorella algae, Torula yeasts, & hydrocarbon-assimilating microorganisms", J. Nutr. Sci, 1973, (pp. 1-13) abst.
Japanese Abstract JP56060699A, "Dehydration of sludge from treatment . . . ", 1981, Abstract.
Chu et al., "Enzyme-linked immunosorbent . . . ", 1990, see abstract.

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